When rounding to a significant figure, look at the first non-zero digit if doing so to one. If rounding to two significant figures, look at the digit following the first non-zero digit.
Between any two non-zero digits, all zeros are important. Seven significant digits are seen in, for instance, 108.0097. There is never any significance for any zeros that are both to the right and left of the decimal point and a digit that is not zero. As an illustration, 0.00798 has three significant digits. The zeros in between two non-zero digits ARE important. Leading zeros have no relevance. The trailing zeros to the right of the decimal point ARE important. A full number's trailing zeros when represented by a decimal are important.
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(A)should have three significant figures, as the lowest number of significant figures is always correct. 0.004911/3.87 = 0.001268 = 0.00127 = 1.27(10)-3. (B) 4*6 has two significant numbers of 1, and 24 rounds to 20 to equal 2(10)1.
The significant figures of a number are the important or critical digits that correctly convey the meaning of that number. For instance, the number 6.658 has four significant digits. The statistics' precision comes from these enormous sums. They are sometimes referred to as significant digits. Significant figures, also known as the significant digits, accuracy, or resolution, are the digits in a number that are reliable and necessary to indicate the quantity of anything in positional notation. If a number indicating the result of a measurement has more digits than the number of digits permitted by the measurement resolution, only the digits allowed by the measurement resolution are reliable, and only these can thus be relevant figures.
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Which of these things you will not find in the periodic table?AElement Name and SymbolBAtomic WeightCNumber of neutronsDAtomic Number
Option (c) is correct. The number of neutrons will not be find in the periodic table.
Periodic table is the arrangement of chemical elements. Chemical elements are arranged in rows that is called periods and columns that is called groups according to increasing atomic number. Scientists use the periodic table to refer to information about an element like atomic mass and chemical symbol. The periodic table’s arrangement also allows to discern trends in element properties including electronegativity, ionization energy, and atomic radius. We can find the name of the element, symbol, atomic weight of the element, atomic number. We can not find the number of neutrons in the periodic table. the properties of the chemical elements exhibit an approximate periodic dependence on their atomic numbers.
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Reasoning: (Explain why your evidence supports you daim using paragraph format, include
relevant scientific principles.)
The main idea of Amy Tan's text is the importance of communication through language.
What is the central idea?It is the subject that the text wants to present.It is the subject that will guide all the information in the text.
In "Mother Tongue," Amy Tan uses her mother as an example to show the importance of communication. That's because it shows that her mother is a Chinese immigrant, who speaks "broken English."
Therefore, The main idea of Amy Tan's text is the importance of communication through language.
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Type the correct answer in each box. what is the empirical formula? a compound being used in experimental medicine is 78.14% boron (b) and 21.86% hydrogen (h). the empirical formula of the compound will have a boron to hydrogen ratio of : .______
In chemistry, the empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.
What is the empirical formula? In chemistry, the empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2. Thus, sulfur monoxide and disulfur dioxide, both compounds of sulfur and oxygen, have the same empirical formula. However, their molecular formulas, which express the number of atoms in each molecule of a chemical compound, are not the same.The molecular formula, on the other hand, shows the number of each type of atom in a molecule.The structural formula shows the arrangement of the molecule. It is also possible for different types of compounds to have equal empirical formulas.The empirical formula is BH₃. Its B:H ratio is 1:3.
Assume that you have 100 g of the compound.
Then you have 78.14 g B and 21.86 g H.
Now, we must convert these masses to moles and find their ratios.
From here on, I like to summarize the calculations in a table.
Element Mass/g Moles Ratio Integers
B 78.14 7.2285 1 1
H 21.86 21.686 3.0001 3
The empirical formula is BH₃.
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The empirical formula will have a boron to hydrogen ratio of 1:3.
What is the empirical formula?In chemistry, the empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2.
Thus, sulfur monoxide and disulfur dioxide, both compounds of sulfur and oxygen, have the same empirical formula. However, their molecular formulas, which express the number of atoms in each molecule of a chemical compound, are not the same.
The molecular formula, on the other hand, shows the number of each type of atom in a molecule. The structural formula shows the arrangement of the molecule. It is also possible for different types of compounds to have equal empirical formulas.
Determination of boron to hydrogen ratio in empirical formula:The empirical formula is BH₃. Its B:H ratio is 1:3.
Assume that you have 100 g of the compound.
Then you have 78.14 g B and 21.86 g H.
Now, we must convert these masses to moles and find their ratios.
From here on, I like to summarize the calculations in a table.
Element Mass/g Moles Ratio Integers
B 78.14 7.2285 1 1
H 21.86 21.686 3.0001 3
The empirical formula is [tex]BH_{3}[/tex].
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Is all of this correct ? Experts in chemistry please answer ! I need help
Organofluorines are organic molecules that include the greenhouse gas link. Foxine behavior discusses the composition of these chemicals.
What does "foxine" on a stamp mean?Old paper documents like books, postage stamps, and awards can develop spots and discoloration due to foxing, a time of life process of degeneration. The stains' fox - like reddish-brown hue or the potential participation of the rusting chemical ferric oxide may be the sources of the term.
What does board foxine mean?On old paper documents like books, postage stamps, old banknotes, and certificates, circa survive age-related process of weakening spots and browning. The stains' fox - like reddish-brown hue or the suspected participation of the rust ingredient ferric oxide may be the origin of the term.
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REPORT SHEET EXPERIMENT Colorimetric 22 Determination of an Equilibrium Constant in Aqueous Solution A. Preparation of the Calibration Curve Concentration of Fe(NO) in 0.10 MHNO3 solution O 2 M Concentration of NaSCN in 0.10 M Nos solution 0.002 M Flask Number volume of NascN, mL O Solution Initial [SCNT], M x 10-5 Equil. [FeNCs: MM Percent T 13.2 21.2. Absorbance 0.412. B. Determination of the Equilibrium Constant Concentration of Fe(NO3)3 in 0.10 MHNOn solution 0.002 M. Concentration of NasCN in o.10 M HNo, solution 0.002 M. Test Tube Number Solution Temperature Volume of Fe (NO3, 5 Solution, mL Volume of NaSCN Solution, mL Initial [Fe M 0.00 0.001 0.001 0.001 0.001 0.001 8.0x10 0.001 Initial [SCN 1. M 293
The Equilibrium Constant Concentration of Fe(NO3)3 is Keq 2.79*10^2 and molar extinction coefficient is 4438 L/mol.
Slope of the above calibration curve represents molar extinction coefficient in L/mol for Fe(SCN)2+.
Hence
= 4438 L/mol
B. Determination of K:
Test tube-2: A = 0.193
=> [Fe(SCN)2+]eq = A /
b = 0.193 / 4438 L/mol x 1 = 4.35x10-5 M
[Fe3+]eq = 0.001 - 4.35x10-5 M = 9.565x10-4 M
[SCN-]eq = 2.0x10-4 M - 4.35x10-5 M = 1.565x10-4 M
Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq)
=> Keq = 4.35x10-5 M / ( 9.565x10-4 Mx1.565x10-4 M) = 2.91x102
Test tube-3: A = 0.331
=> [Fe(SCN)2+]eq = A /
b = 0.331 / 4438 L/mol x 1 = 7.46x10-5 M
[Fe3+]eq = 0.001 - 7.46x10-5 M = 9.254x10-4 M
[SCN-]eq = 4.0x10-4 M - 7.46x10-5 M = 3.254x10-4 M
Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq)
=> Keq = 7.46x10-5 M / (9.254x10-4 Mx3.254x10-4 M) = 2.48x102
Test tube-4: A = 0.512
=> [Fe(SCN)2+]eq = A /
b = 0.512 / 4438 L/mol x 1 = 1.15x10-4 M
[Fe3+]eq = 0.001 - 1.15x10-4 M = 8.85x10-4 M
[SCN-]eq = 6.0x10-4 M - 1.15x10-4 M = 4.5x10-4 M
Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq)
=> Keq = 1.15x10-4 M / (8.85x10-4 Mx4.5x10-4 M) = 2.89x102
Test tube-5: A = 0.634
=> [Fe(SCN)2+]eq = A
b = 0.634 / 4438 L/mol x 1 = 1.43x10-4 M
[Fe3+]eq = 0.001 - 1.43x10-4 M = 8.57x10-4 M
[SCN-]eq = 8.0x10-4 M - 1.43x10-4 M = 6.57x10-4 M
Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq)
=> Keq = 1.43x10-4 M / (8.57x10-4 Mx6.57x10-4 M) = 2.54x102
Test tube-6: A = 0.890
=> [Fe(SCN)2+]eq = A /

b = 0.890 / 4438 L/mol x 1 = 2.01x10-4 M
[Fe3+]eq = 0.001 - 2.01x10-4 M = 7.99x10-4 M
[SCN-]eq = 0.001 M - 2.01x10-4 M = 7.995x10-4 M
Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq)
=> Keq = 2.01x10-4 M / (7.99x10-4 Mx7.99x10-4 M) = 3.15x102
Average Keq
= (2.91x102 +2.48x102 +2.89x102 +2.54x102 +3.15x102 ) / 5
= 2.79x102
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A stopped car begins to accelerate at 2 m/s2, and continues this acceleration for 7 seconds. What will its speed be when it finishes accelerating?
please show work if u answer
A stopped car begins to accelerate at 2 m/s2 and continues this acceleration for 7 seconds, so its speed will be 14 m/s when it finishes accelerating, so the car's final speed is 14 m/s.
What is the significance of the speed?The speed of an object, such as a car, determines its velocity, and more importantly, the faster the speed, the faster the car arrives at its destination point, the calculation is shown below.
v = at + v₀, (a= acceleration, v₀= initial velocity, t= time)
v= 2m/[tex]{s}^2[/tex] × 7 sec + 0 m/s
v= 14 m/s
Hence, a stopped car begins to accelerate at 2 m/s2 and continues this acceleration for 7 seconds, so its speed will be 14 m/s when it finishes accelerating, so the car's final speed is 14 m/s.
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Describe the three main industries in which most batteries are used. What is the overall reason that these industries use more batteries than any other?
The three industries that require batteries are the;
Medical industryAutomotive industry Electronic IndustryWhat are batteries?We know that batteries are pieces of hardware that are used to convert chemical energy into electrical energy. The chemical energy is stored in the battery. This energy can now be released by the use of some kind of electro chemical reactions.
Now, we should know that some industries tend to be more reliant on the use of battery technology than the other industries and there could be a lot of reasons for this.
For instance, in the medical sector, batteries are used to power a ,lot of gadgets that are used in medicine such as the pacemakers that can be able to serve as artificial hearts. In the electronic industries, the use of lithium ion batteries have become very common and they help in the production of gadgets. In the automotive sector, the batteries play a key role in the functioning of automobiles.
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A student uses 0.0850 mol copper sulfate to carry out a reaction. If the reaction uses up 0.0832 mol copper sulfate, how many formula units are left un-reacted?
There will be 1.084×10²¹ formula units are left un-reacted.
A formula unit is what?A formula unit is the part of an ionic compound's chemical formula that lists the ions in the smallest ratio necessary to produce a neutral electrical charge. In chemistry, we utilize chemical formulae to explain the constituent parts or molecules of a substance.
Given, initial amount of CuSO4 = 0.0850 mole
amount of CuSO4 consumed in reaction = 0.0832 mole
remaining amount of CuSO4 = 0.0850 - 0.0832 = 0.0018 mole
now, 0.0018 mole CuSO4 × (6.02×10²³ f. u./1 mole) = 1.084×10²¹ f. u.
There will be 1.084×10²¹ formula units are left un-reacted.
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If the reaction uses up 0.0832 mol copper sulfate there will be 1.084×10²¹ formula units are left un-reacted.
A formula unit is what?A formula unit is the part of an ionic compound's chemical formula that lists the ions in the smallest ratio necessary to produce a neutral electrical charge. In chemistry, we utilize chemical formulae to explain the constituent parts or molecules of a substance.
Given, initial amount of CuSO4 = 0.0850 mole
amount of CuSO4 consumed in reaction = 0.0832 mole
remaining amount of CuSO4 = 0.0850 - 0.0832 = 0.0018 mole
now, 0.0018 mole CuSO4 × (6.02×10²³ f. u./1 mole) = 1.084×10²¹ f. u.
There will be 1.084×10²¹ formula units are left un-reacted.
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In a third experiment, 0.10 g samples of Mg(s) are placed in excess HCl(aq) of various concentrations:
0.050 M, 0.10 M, 0.25 M, and 0.50 M. The reactions are run in successive order from 0.050 M to
0.50 M, and the time required for each reaction to go to completion is recorded. As the concentration of HCl(aq)
increases from 0.050 M to 0.50 M, which of the following is the expected result?
(A), The reaction time increases, and the rate of the reaction decreases.
The reaction time decreases, and the rate of the reaction increases.
(C) Both the reaction time and the rate of the reaction increase.
(D) Both the reaction time and the rate of the reaction decrease.
+2H30+ H₂AsQ₂ + 1₂ + H₂O
The expected result as the concentration of HCl(aq) increases from 0.050 M to 0.50 M is: (B) The reaction time decreases, and the rate of the reaction increases.
What is the expected result?An aqueous solution of hydrogen chloride is what is known as hydrochloric acid, also referred to as muriatic acid. It has an unmistakably strong odor and is colorless. It is categorized as a powerful acid. It is a part of the gastric acid in most animal species' digestive systems, including humans.
The expected result as the concentration of HCl(aq) increases from 0.050 M to 0.50 M is that the reaction time decreases, and the rate of the reaction increases. This is because as the concentration of the acid increases, the number of acid molecules in the solution increases and therefore the number of collisions between acid molecules and magnesium increases. This leads to more frequent and successful collisions and a faster rate of reaction.
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A violet light has a wavelength of 413 nm. What is the energy of a photon of light with this wavelength?
Answer:
1.0 joules
Explanation:
Violet light has a frequency of 410,000 hertz and an energy of 1.0 joules. Now we can compare the energy of photons of violet light with those of red light. Photons of violet light have more energy than photons of red light.
What is the term for the chromosomes that are identical after DNA replication?
Sister chromatids is the term for the chromosomes that are identical after DNA replication.
Sister chromatids are identical chromosomes that are created during the process of DNA replication. DNA replication is the process where a DNA strand is copied, creating a new strand. During this process, each chromosome is split in half, forming two identical halves.
These halves are known as sister chromatids and are held together by a centromere. Sister chromatids are attached to one another during the interphase stage of the cell cycle and are separated during the metaphase stage of the cell cycle.
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Choose the correct condensed structure from the name: hexene.
O CH3CHCHCHCH3
O CHCCH2CH3
O CH3CH2CH2CH2CH2CH3
O CH3CH2CHCHCH2CH3
The correct condensed structure of hexene is CH₃CH₂CH=CHCH₂CH₃.
A condensed structural formula also termed as semi-structural formula and it is used to describe the organic compounds in a line of text. They will be illustrated in a single line of text and specifies the atoms in the order which are located in a molecule.
Hexene is a hydrocarbon having chemical formula C₆H₁₂. It s used as a comonomer in the production of the polyethylene. There are several number of isomers in hexene, depending on the geometry and position of the double bond in the chain. One of the most common useful of isomers is 1-hexene as well as an alpha-olefin.
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All of the following statements about lighteners are true EXCEPT:
a) they are used at relatively high levels
b) they slowly block the production of melanin in the skin
c) they are used to bleach or lighten areas of hyperpigmentation
d) they usually take months of continued use to deliver a noticeable effect
The following statement is not true about lighteners- " They are used at relatively high levels'.
Skin lighteners are products that are designed and used to bleach the skin from dark spots and pigments. They are usually used to improve one's physical appearance such as blemishes, dark patches and birthmarks.
They work on the skin by reducing or slowly blocking the production of melanin in the skin. The pigment melanin is responsible for the colour it gives to our skin. It also protects our skin from the harmful effects of the sun.
It usually takes few weeks or even three to four months for lighteners to show effective results on continued usage.
Thus, option (a) is correct.
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Which type of concentration is calculated when the grams of solute is divided by the grams of the solution, and the result is multiplied by 1,000,000?.
Parts per million is the type of concentration calculated when the grams of solute is divided by the grams of solution, and the result is multiplied by 1,000,000 (option 2)
Parts per million, or ppm, is one method of expressing concentration. The formula involves dividing the grams of solute and the grams of solution, then multiplying the result by 1,000,000 (one million). One milligram of solute per kilogram of solution is equal to parts per million.
This stands for "parts per million" and can also be written as mg/L (milligrams per liter). The mass of a chemical or contamination per volume of water is the unit of measurement here. On a lab report, ppm or mg/L both mean the same thing.
The absolute fractional amount multiplied by one million equals one ppm. To better understand ppm, imagine placing four droplets on a table.
The question is incomplete, it should be:
Which type of concentration is calculated when the grams of solute is divided by the grams of the solution, and the result is multiplied by 1 000 000?
(1) molarity
(2) parts per million
(3) percent by mass
(4) percent by volume
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Which one of the following is correct?
a. ν = cλ
b. νλ = c
c. ν ÷ λ = c
d. ν + λ = c
e. λ = c ν
Answer:
A Is the correct answer..
Calculate the approximate molecular weight of a protein composed of 701 amino acid residues in a single polypeptide chain. kDa approximate weight:
One single amino acid weighs 110 D a. Now, this problem is fairly simple. The way we find out, the weight of 701 amino acids is just multiplying. Ah, that number by 110. So all we have to dio is multiply 682 by 110. So our final answer will be 77,110.
What is amino acid?Amino acids are the building blocks of protein. Proteins are long chains of amino acids. Your body has thousands of different proteins that each have important jobs. Each protein has its own sequence of amino acids. The sequence makes the protein take different shapes and have different functions in your body.You can think of amino acids like the letters of the alphabet. When you combine letters in various ways, you make different words. The same goes for amino acids — when you combine them in various ways, you make different proteins.Amino acids are molecules used by all living things to make proteins. Your body needs 20 different amino acids to function correctly. Nine of these amino acids are called essential amino acids. Essential amino acids must be consumed through the food you eat. Essential amino acids can be found in a variety of foods, including beef, eggs and dairy.To learn more about molecules refer to:
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The empirical formula of a chemical substance is c2h3. the molar mass of a molecule of the substance is 54.091 g/mol. what is the molecular formula of the chemical substance? a. c2h4 b. c4h8 c. c4h6 d. c6h9
The molecular formula of the chemical substance is C2H3 * 2.068 = C4H6 which is option (c)
The empirical formula of a chemical substance gives the lowest whole-number ratio of atoms in a molecule. The molar mass of a substance is the mass of one mole of the substance. To find the molecular formula of a substance, we need to determine the ratio of atoms in the molecule and compare it to the ratio given by the empirical formula.
The molar mass of the substance is 54.091 g/mol, and the empirical formula is C2H3. To find the molecular formula, we can divide the molar mass by the molar mass of the empirical formula.
54.091 g/mol / (2 x 12.011 g/mol + 3 x 1.008 g/mol) = 54.091 g/mol / 26.042 g/mol = 2.068
Since the ratio of atoms in the molecule is 2.068 times that of the empirical formula, the molecular formula is C2H3 * 2.068 = C4H6 which is option (c)
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Answer:
C4H6 (c)
Explanation:
I took the test
4. [1 mark]
0.10 mol of hydrochloric acid is mixed with 0.10 mol of calcium carbonate.
2HCl (aq) + CaCO3 (s) → CaCl2 (aq) + H₂O (1) + CO2 (g)
Which is correct?
The limiting reagent in a chemical reaction is HCl (aq); the maximum output of CO2/mol is 0.05; and the reactant that is consumed first is CO2.
What does a limiting reagent perform and why is it required?The limiting reactant, sometimes referred to as the limiting reagent, regulates how much product is produced in a chemical process. If the limiting reactant has been found, the theoretical yield of the reaction may be calculated.
What substance is the reaction's limiting agent?The limiting reagent is the one that will completely consume itself in a chemical process. Once that reactant has been used up, the reaction cannot go on. As a result, it stops the reaction from getting stronger. The excess reagent would have continued to react if the other reactant hadn't been consumed.
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PLS HELP ME ASAP I NEED HELP PLS PLS PLS PLS PLS PLS PLS PLS PLS PLS
The balanced chemical reaction of sodium and sulfur can best be described as: B. 2Na(s) + S(s) → Na₂S(s)
How can the reaction be represented?To represent the reaction between sodium and sulfur, we would express the elements and their states as shown above. So, 2 atoms of sodium would react with 1 atom of sulphur to yield a compund known as sodium sulphide.
This compound contains two atoms of sodium and 1 atom of sulphur. The physical state is solid. So, the correct option number that expresses this is B.
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What amino acid sequence will be created during translation?
The amino acid sequence will be determined by the codons in the mRNA sequence that is being translated.
During translation, the mRNA sequence is read three nucleotides at a time, and each codon is translated into an amino acid based on the genetic code. This process is known as the "triplet code" because codons are made of three nucleotides.
The ribosome reads the mRNA sequence and translates it into a protein by recruiting amino acids in the correct order. The tRNA molecules carry the correct amino acids to the ribosome, where they are added to the growing polypeptide chain.
The ribosome continues to read the mRNA sequence until it reaches a stop codon, which signals the end of the translation and the completion of the amino acid sequence.
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how is molecular formula related to empirical formula?
The molecular formula gives the actual number of atoms of each element present in a molecule, while the empirical formula gives the simplest whole number ratio of atoms of each element present in a molecule.
The molecular formula and the empirical formula of a compound are related but they are not the same. The molecular formula is the actual number of atoms of each element present in a molecule of the compound, while the empirical formula gives the simplest whole number ratio of atoms of each element present in a molecule of the compound.
In other words, the molecular formula expresses the exact number of atoms of each element present in a molecule and the empirical formula expresses the relative number of atoms of each element. For example, glucose has a molecular formula of C6H12O6, but its empirical formula is CH2O, which gives the simplest ratio of atoms in the molecule. In general, the molecular formula can be a multiple of the empirical formula.
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A cylinder containing carbon dioxide of volume 20L at 2.0 atm was connected to another cylinder of certain volume at constant temperature. The final pressure of the gas in the cylinders was found to be 380 mm Hg. Calculate the volume of the second cylinder.
Answer:
Vfinal = 22.7 L
Explanation:
PV = nRT
(2.0 atm)(20 L) = n(0.0821 L-atm/K-mol)(273 K)
n = 0.195 moles of CO2
P (final)V (final) = nRT
(380 mmHg)(Vfinal) = (0.195 moles)(0.0821 L-atm/K-mol)(273 K)
Vfinal = 22.7 L
What are the four types of verbal irony?
The four types of verbal irony are verbal irony, sarcasm, innuendo, and hyperbole.
Verbal irony is the intentional use of words to express something different from what is said. It is a figure of speech often used for comedic effect, to emphasize a point or to add emphasis.
Sarcasm is a type of verbal irony that is used to mock, ridicule, or criticize someone. Innuendo is a type of verbal irony that implies a hidden meaning or suggests something without directly saying it.
Finally, hyperbole is an exaggerated statement used in an attempt to make a point or to emphasize something. All four types of verbal irony can be used to make a point more effectively or to add humor to a conversation.
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What would a liquid at 50 degrees Celsius. I want to know it’s melting and boiling point.
A liquid at 50 degrees Celsius would have a melting point of 50 degrees Celsius and a boiling point of approximately 173.15 degrees Celsius.
What is the liquid?
iquid is a state of matter that has a definite volume, but does not have a fixed shape. It is one of the four fundamental states of matter, along with solid, gas, and plasma. Liquids tend to have a greater volume than solids, but geneLrally take the shape of their container. Examples of liquids include water, milk, blood, gasoline, and oil. Liquids are composed of molecules that tend to have greater mobility and can easily flow past each other. Depending on the temperature, pressure, and composition of the liquid, it can undergo changes in the state of matter.
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If 25.0 ml of a 2.0 m naoh solution is used for the reaction
To solve this problem is not necessary to have the chemical reaction. Just use the formula of Molarity and solve it for moles.
moles = 0.2 x 0.025=0.005.
Define mole?In the International System of Units, a substance's amount is measured in moles, which are denoted by the sign mol. The quantity of a substance is a measurement of the number of elementary entities of a specific substance present in an object or sample. Exact 6.022140761023 elementary items are required to define a mole.The unit of measurement known as the mole (symbol: mol) refers to the quantity of matter in a system that includes the same number of atoms as there are in 0.012 kilograms of carbon 12.Previously, a mole was defined as the quantity of atoms found in 12 grams of carbon-12, as determined through experimentation.The complete question is:
NaOH (aq) + HCl(aq) H2O + NaCl (aq)
If 25.0 mL of a 0.2 M NaOH solution is used for the reaction
shown above, how many moles of NaOH were involved in the
reaction? _moles.
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The number of moles for the chemical reaction will be equal to 0.005, if 25.0 ml of a 2.0 m NaOH solution are used.
What is mole?The amount of a material is expressed in moles, which are represented by the symbol mol in the International System of Units. A substance's amount is a measurement of how many of its fundamental components are present in an object or sample. To define a mole, precisely 6.022140761023, elementary components are needed.
The term "mole" (symbol: mol) refers to the amount of matter in a system that contains the same number of atoms as there are in 0.012 kilograms of carbon 12. Previously, a mole was determined through experimentation to be the number of atoms present in 12 grammes of carbon-12.
Determine the number of moles:moles = 0.2 x 0.025=0.005.
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The complete question is:
NaOH (aq) + HCl(aq) H2O + NaCl (aq)
If 25.0 mL of a 0.2 M NaOH solution is used for the reaction
shown above, how many moles of NaOH were involved in the
reaction? _moles.
a substance that donates one proton when dissolved in water
A. analyte
B. diprotic acid
C. salt
D. triprotic acid
E. monoprotic acid
F. titrant
A monoprotic acid is an acid that donates one proton (H+) when dissolved in water. Thus option E is the correct answer.
A monoprotic acid is an acid that donates one proton (H+) when dissolved in water, thus forming the corresponding conjugate base and hydronium ions (H3O+). Examples of monoprotic acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), and acetic acid (CH3COOH).
A diprotic acid is an acid that donates two protons when dissolved in water. An example of diprotic acid is sulfuric acid (H2SO4). A tricrotic acid is an acid that donates three protons when dissolved in water. An example of tricrotic acid is phosphoric acid (H3PO4). An analyte is a substance or ion that is being analyzed in a chemical or biological sample.
Salt is a neutral compound formed from the reaction of an acid and a base, which typically contains positively and negatively charged ions. A titrant is a solution of known concentration, used to determine the concentration of an unknown solution through a titration process.
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At a certain temperature, this reaction establishes an equilibrium with the given equilibrium constant, Kc. 3A(g)+2B(g)↽−−⇀4C(g)c=2.93×1021 If, at this temperature, 1.00 mol of A and 3.50 mol of B are placed in a 1.00 L container, what are the concentrations of A, B, and C at equilibrium?
The equilibrium concentration of A, B and C are 0.02 M, 2.38 M and 3.04 M respectively.
What is Equilibrium Concentration?When the products and reactants do not alter over time, we say that a chemical is in equilibrium concentration.
In other words, a chemical reaction enters a state of equilibrium or equilibrium concentration when the rate of the forward reaction equals the rate of backward reaction.
We are given:
Initial moles of A = 2.30 molesInitial moles of B = 3.90 molesThe volume of the container = 1.00 LConcentration = Number of moles/ Volume
So, the concentration of A is 2.30M
The concentration of B is 3.90M
If we factor in the chemical equation given: 3A(g) + 2B(g) ---> 4C(g)
Initial: 2.30 3.90
At eqllm: 2.30-3x 3.90-2x 4x
After solving, we would get that the equilibrium concentration of A, B and C are 0.02 M, 2.38 M and 3.04 M respectively.
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Based on its chemical formula, the percent composition of sodium chloride, NaCl, (to four significant figures) is
So, sodium and chloride make up 39.3% and 60.7%, respectively, of NaCl.
What is sodium and chloride?A compound's constituent elements are always present in the same proportions by mass, according to the Law of Definite Proportions. The relative mass of each element in a compound is indicated by the complex's percent composition. A compound's elemental mass represented as a portion of the compound's overall mass is called the mass percent. One oxygen atom and two hydrogen atoms, for instance, make up the structure of the water molecule. Both hydrogen and oxygen make up 88.8% and 11.2% of the total mass, respectively. The whole composition of a water molecule is shown by these figures. In light of this, the % composition of every pure water sample will always be the same. Meaning that water will contain 88.8% oxygen and 11.2% hydrogen.Example:
What is the % composition of a compound with a total mass of 34.37 g, of which 21.43 g is phosphorous and 12.94 g is magnesium?
Mass percent of magnesium equals 12.94g/34.37g, or 37.6%
21.43g/34.37g or 62.4% of the mass is made up of P.
Magnesium and phosphorous make up 37.6% and 62.4%, respectively, of this compound's percent composition.
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Explain why the atomic radius of hydrogen is so much smaller than that the atomic radius for potassium.
In How penicillin was discovered
. Write a statement that summarizes the results of the experiment bacteria
. This experiment lead to the development of what major medical advancement?
In 1928, Sir Alexander Fleming was studying Staphylococcus bacteria growing in culture dishes. Bacterial infections are treated with penicillins
What is penicillin used for?Bacterial infections are treated with penicillins. The germs are either eliminated or their growth is stopped. Penicillins come in a variety of varieties. Every one of them is employed to cure various infections. Penicillin-class medications include amoxicillin and penicillin. Penicillin's naturally occur in nature and are the basis for the drugs penicillin V and penicillin G; nevertheless, amoxicillin was created by chemically enhancing penicillin's to increase their potency. Amoxicillin hence has a tendency to treat more bacterial illnesses.Staphylococcus bacteria were being studied in culture dishes in 1928 by Sir Alexander Fleming. In several of the dishes, he also saw the growth of a mold called Penicillium. The mold was surrounded by a clear space since all the microorganisms that had colonized it had perished. No clear areas could be seen in the culture dishes that were mold-free.According to Fleming's theory, the mold must be releasing a chemical that kills the bacteria. To find out if this compound might kill bacteria, he made the decision to isolate it. The mold was transferred by Fleming to a broth solution containing nutrients. Each element the mold need to grow was present in this solution.
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