Answer:
[tex]1.58\ \text{g}[/tex]
Explanation:
10.11 g sample of [tex]NaBr[/tex] contains 22.34% [tex]Na[/tex] by mass
According to the law of constant composition the if one sample of [tex]NaBr[/tex] has 22.34% of [tex]Na[/tex] by mass then any other sample of [tex]NaBr[/tex] will have the same percentage of the amount of [tex]Na[/tex].
For a sample of 7.09 g we have
[tex]7.09\times \dfrac{22.34}{100}=1.583906\approx 1.58\ \text{g}[/tex]
The mass of sodium in the required sample is [tex]1.58\ \text{g}[/tex].
g The gas molecules in the internal combustion engine chamber are in a high state of random motion. When the molecules are expelled through an exhaust pipe in a more ordered state, what will their temperature be as their temperature in the chamber before being exhausted
Answer:
Explanation:
Entropy is the measure of randomness of a system . When heat is added to a gas , gas molecules become more random and therefore , their entropy increases . Hence at higher temperature , entropy increases and randomness increases due to addition of heat .
Hence when a gas molecules become more ordered that means entropy decreases . Hence heat is withdrawn from the system . Hence temperature of the system is decreases .
In the given case , gas molecules are made more ordered that means their temperature is decreased to lower the entropy before they are exhausted .
5. At high pressures, how does the volume of a real gas compare with the volume of an ideal gas under the same conditions, and why?
a. It is much greater because real gas partides take up space.
b. It is much less because real gas particles are not moving.
c. It is much less because at high pressures the temperature drops.
d. There is no difference because the gas laws are always obeyed.
Answer:
C. it is much less because at high pressure the temperature drops
At high pressures, the volume of a real gas is much less because at high pressures the temperature drops.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.Usually as the pressure increases ,volume increases.
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Calculate the bond energy in the ionic compound Nacl if the bond length is 2.36x10^-10m
This question is incomplete, the complete complete question is;
Coulomb's law for the energy of interaction between two charged ions;
E = Ke × q1q2/r
Coulomb's constant Ke = 2.31 × 10⁻²⁸ J.m.
Calculate the bond energy in the ionic compound NaCl if the bond length is 2.36 × 10⁻¹⁰m
Answer:
the bond energy is -9.788 × 10⁻¹⁹ J
Explanation:
Given the data in the question;
Ke = 2.31 × 10⁻²⁸ J.m which is the same as; Ke = 2.31 × 10⁻²⁸ Nm L/c²
ionic compound NaCl;
q1 = charge on Na in NaCl = Na⁺ = + 1C
q2 = charge on Cl in NaCl = Cl⁻ = - 1C
given that bond length r is 2.36 × 10⁻¹⁰m
E = Ke × q1q2/r
we substitute
E = 2.31 × 10⁻²⁸ × (+1 × -1) / 2.36 × 10⁻¹⁰
E = -2.31 × 10⁻²⁸ / 2.36 × 10⁻¹⁰
E = -9.788 × 10⁻¹⁹ J { The negative sign means Attraction in ions }
Therefore, the bond energy is -9.788 × 10⁻¹⁹ J
Which of the following substances contains MOSTLY ionic bonding? A) LIF B) CO2 C) AICI: D) BeCl2 E) Cu
Answer: [tex]LiF[/tex] , [tex]AlCl_3[/tex] and [tex]BeCl_2[/tex]
Explanation:
An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal.
A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.
[tex]LiF[/tex] , [tex]AlCl_3[/tex] and [tex]BeCl_2[/tex] contain ionic bonds as they aremade up of metals and non metals.
i need help...............
Answer:
bird or bacteria and fungi
Explanation:
oof oof oof oof oof
3. How can millions of
compounds be made from the
atoms of about 100 elements?
Answer:
The answer is that compounds are formed when elements are joined and held together by strong forces called chemical bonds. ... Covalent bonds share electrons between atoms in order to fill their electron shells. In the compound, molecules are held together by the attraction between the nucleus and the shared electrons.
Millions of compounds can be made from just 100 elements because the atoms of these 100 elements can combine with each other in different ways to produce countless compounds.
A compound is formed when atoms of two or more elements are chemically combined together.
100 elements can combine with each other in many different ways. For instance, carbon combines with almost all the known elements to form unique compounds in each case depending on the arrangement of atoms of elements or type of element in each of the compounds formed.
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i need all these im not in the mood for it toddayyy
Answer:
Me too
Explanation:
How many grams of NaCl are in 4.25 mol of NaCl?
2.46 g NaCl
2.47 x 102 g Naci
5.64 g NaCl
546 g NaCl
Answer:
546 g NaCI
Explanation:
because 1 mole is equal to 1 moles NaCI or 58.44277 grams.
Ways in which ions may form include
Answer:
Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association
The ways Ions may form includes the following
The addition of electrons to neutral atoms or moleculesThe removal of electrons from neutral atoms or molecules By combination of ions with other particlesWhen the number of protons does not equal the number of electrons in an atomMeaning of an IonAn ion can be defined as an atom or group of atoms possessing an electrical charge. Ions are of two types, they are : Anions which are negatively charged and Cations which are positively charged.
In conclusion, an ion can be formed by many ways, but a few has been listed above.
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(i) The yield of lead iodide from this experiment was 3.5 g.
The theoretical yield of lead iodide for this experiment was 5.0 g.
Calculate the percentage yield of lead iodide in this experiment.
Answer:
Explanation:
48833.03
Which of the following is not a chemistry topic?
A.the composition of ocean water
B.what ocean fish eat
C.the height of waves in surf
D.what a surf board is made of
Chemistry is the scientific field that studies matter and substances. It involves composition, structure, arrangement, etc. It does not involve the height of waves in the surf. Thus, option C is correct.
What is chemistry?Chemistry has been defined as the branch of study and science that studies, analyzes, investigates, and identifies matter and its components. It includes elements, molecules, and compounds.
The composition of ocean water involves the identification and analysis of the various substances. As ocean water is a matter and is studied in chemistry. The food the ocean fishes consume involves chemical composition.
The height of the waves in the surf is a measurement and is studied in mathematics and not chemistry. On the other hand, the composition of the surfboard involves the chemical and their bonds.
Therefore, option C . the height of the waves is not a topic of chemistry.
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PLEASE ANSWER QUICKLY!!!
Answer:
A and C
Explanation:
An ion dipole interaction exists between a molecule having a dipole and an ion. The positive end of the dipole interacts with a negative ion while the negative end of the dipole interacts with a positive ion.
If we look at the options listed, the H-H bond is non polar, hence it can not show ion-dipole interaction.
Similarly, the H-F bond is polar, but the negative end of the dipole (F) is made to interact with a sulphide(negative) ion which is incorrect.
A 9.725-g gaseous mixture contains ethane () and propane (). Complete combustion to form carbon dioxide and water requires 1.115 moles of oxygen gas. Calculate the mass percent of ethane in the original mixture.
Answer:
% = 33.83%
Explanation:
To do a better understanding of this, we can treat the mixture of the combustion as two separate reactions, in that way, we can have an idea of what is happening and how to calculate the mass percent.
So the combustion reactions in this mixture are:
2C₂H₆ + 7O₂ ---------> 4CO₂ + 6H₂O
C₃H₈ + 5O₂ ----------> 3CO₂ + 4H₂O
Now that we have both reactions (And balanced) we can hace an idea of the mole ratio between every compound in the mix.
For practical purposes, let's call "a" the mass of ethane, and "b" the mass of propane. The innitial mix have 9.725 g, so this means that:
a + b = 9.725 g (1)
Now that we have this, we can write a relation between the moles of oxygen and the moles of the gases. If we have 1.115 moles of oxygen, and also know the mole ratio of oxygen to "a" and "b", so:
moles O₂ = moles a (moles O₂/moles a) + moles b (moles O₂/moles b) (2)
And we know that moles a and moles b are:
moles a = a / MW
moles b = b / MW
The MW of a is 30 g/mol and the MW of b is 44 g/mol
Replacing the given data we have:
1.115 moles O₂ = (a/30)(7 moles O₂/2 moles a) + (b/44)(5 moles O₂/1 mole b)
1.115 moles O₂ = (0.1167a) moles O₂ + (0.1136b) moles O₂
To keep solving this, we can use expression (1) to solve for b, and then, replace here and have only one equation with 1 incognite:
a + b = 9.725 g
b = 9.725 - a (3)
Replacing above we have:
1.115 = 0.1167a + 0.1136(9.725 - a)
1.115 = 0.1167a + (1.1048 - 0.1136a)
1.115 - 1.1048 = 0.1167a - 0.1136a
0.0102 = 0.0031a
a = 3.29 g
Now, that we have the mass of the ethane, we can calculate the mass percent:
% = (3.29 / 9.725) * 100
% = 33.83%Hope this helps
The main purpose of the muscular system is to ____
A. Lift heavy things
B. Allow for movement
C Allow for structure
D. Rid the body of unwanted waste
Answer: B. Allow for movement
Explanation: Because the muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction. Make sure to add me as a friend!!! <3 YW!!!
Which one of the following statements best describes electronegativity in atoms?
A) Electronegativity is what happens when an atom gains an electron to become an anion.
B) Electronegativity is the attraction an element's nucleus has for the electrons in a chemical bond
C) Electronegativity is the energy lost when an atom gains an electron
D) Electronegativity is the energy absorbed when an atom loses an electron
Answer: B) Electronegativity is the attraction an element's nucleus has for the electrons in a chemical bond
Explanation:
Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself.
When the size of an atom decreases as we move across the period, as the electrons get added to the same shell and the nuclear charge keeps on increasing. Thus the electrons get more tightly held by the nucleus.
As, the size of an element decreases, the valence electrons come near to the nucleus. So, the attraction between the nucleus and the shared pair of electrons increases and thus the electronegativity increases.
Which two continents does the map show as having the most earthquakes?
Answer:
Where is the map?
Explanation:
Answer:
On the map, Central and South Asia emerge as the areas of the world where earthquakes are more likely to strike, and with greater intensity.
Explanation:
this means that Asia is the most garenteed to get earthquakes rather than many other places
hope this helps
Adding 1.56 g of K2SO4 to 6.00 mL of water at 16.2ºC causes the temperature of the solution to drop by 7.70ºC.
How many grams of NaOH (ΔHsoln = –44.3 kJ/mol) would you need to add to raise the temperature back to 16.2ºC?
Answer:
You need to add 0.243g of NaOH to raise the temperature back to 16.2°C
Explanation:
Using the equation:
Q = C*m*ΔT
Where Q is heat
C is specific heat
m is mass
and ΔT is change in temperature
We can find the heat required to increase the temperature of the solution back to 16.2°C:
Assuming specific heat of the solution of water + K2SO4 = Specific heat of water:
C = 4.184J/g°C
m = 1.56g + 6.00g = 7.56g
ΔT = 16.2°C - 7.70°C = 8.50°C
Q = 4.184J/g°C * 7.56g * 8.50°C
Q = 268.86J = 0.269kJ of heat are required
As this heat is obtained from the dissolution of NaOH:
0.269kJ * (1mol NaOH / 44.3kJ) = 0.00607 moles of NaOH are required
In grams -Molar mass NaOH: 40g/mol-:
0.00607 moles NaOH * (40g / mol) =
You need to add 0.243g of NaOH to raise the temperature back to 16.2°CFor many purposes we can treat methane (CH4 as an ideal gas at temperatures above its boiling point of -161. °C Suppose the temperature of a sample of methane gas is raised from -19.0 °C to 12.0 °C, and at the same time the pressure is changed. If the initial pressure was 5.6 atm and the volume decreased by 50.0%, what is the final pressure? Round your answer to the correct number of significant digits.
Answer: The final pressure is 12.6 atm
Explanation:
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 5.6 atm
[tex]P_2[/tex] = final pressure of gas = ?
[tex]V_1[/tex] = initial volume of gas = v
[tex]V_2[/tex] = final volume of gas = [tex]v-\frac{50}{100}v=0.5v[/tex]
[tex]T_1[/tex] = initial temperature of gas = [tex]-19.0^0C=(-19+273)K=254K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]12.0^0C=(12.0+273)K=285K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{5.6\times v}{254}=\frac{P_2\times 0.5v}{285}[/tex]
[tex]P_2=12.6atm[/tex]
The final pressure is 12.6 atm
ANSWER ASAP
The (blank) state is the lowest possible energy level that an electron can occupy.
When the electron gains energy, it may move to a higher energy level. This is called the (blank) state.
Answer:
The first one is ground and the second one is excited
Explanation:
Sam records the mass of his evaporating dish as 6.488 g. He records the mass of the evaporating dish and the sample of hydrate as 19.72 g. After heating the sample in the evaporating dish to constant weight, the mass of them combined is 11.344 g. How many moles of water were removed from the sample by the heating process?
Answer:
[tex]0.46[/tex] moles of water were removed from the sample by the heating process
Explanation:
Given
Mass of the evaporating dish [tex]= 6.488[/tex] grams
Mass of the sample of hydrate [tex]= 19.72[/tex] grams
Mass of the sample and dish after heating [tex]= 11.344[/tex] grams
The weight of water removed through evaporation
[tex]= 19.72 - 11.344 = 8.376[/tex] grams
Weight of one mole of water [tex]= 18[/tex] grams
Number of moles of water in [tex]8.376[/tex] Grams of water is equal to
[tex]\frac{8.376}{18} = 0.46[/tex] moles
Strontium metal reacts with aluminum chlorate to produce strontium
chlorate and aluminum metal. Identify the type of reaction, then write a
complete balanced chemical equation for the reaction. If no reaction
occurs, explain why. (2 points)
Answer: single replacement reaction, [tex]3Sr+2Al(ClO_3)_3\rightarrow 3Sr(ClO_3)_2+2Al[/tex]
Explanation:
A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.
A general single displacement reaction can be represented as :
[tex]XY+Z\rightarrow XZ+Y[/tex]
As strontium metal is added to aluminum chlorate , strontium being more reactive than aluminium, displaces aluminium atom its salt solution and lead to formation of strontium chlorate and aluminum metal.
[tex]3Sr+2Al(ClO_3)_3\rightarrow 3Sr(ClO_3)_2+2Al[/tex]
Which statement accurately describes the atoms of an atom of Sulfur 10 points with a mass number of 33? A) There are 16 particles inside of the nucleus and 17 particles outside of the nucleus B) There are 33 particles inside of the nucleus and 33 particles outside of the nucleus. C) There are 17 particles inside of the nucleus and 17 particles outside of the nucleus. D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.
Answer:
D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.
Explanation:
Sulfur has an atomic number of 16. The atomic number represents the number of protons, so sulfur has 16 protons.
This atom of sulfur has a mass number of 33. The mass number is the sum of protons and neutrons. Then, the number of neutrons is 33 - 16 = 17
Sulfur is a neutral atom. Therefore, it has the same number of positive charges (protons) and negative charges (electrons). Thus, sulfur has 16 electrons.
Protons and neutrons are in the nucleus and electrons are outside the nucleus.
Taking all the above into account, the correct answer is:
D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.
Answer:
D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.
Explanation:
Sulfur has an atomic number of 16. The atomic number represents the number of protons, so sulfur has 16 protons.
This atom of sulfur has a mass number of 33. The mass number is the sum of protons and neutrons. Then, the number of neutrons is 33 - 16 = 17
Sulfur is a neutral atom. Therefore, it has the same number of positive charges (protons) and negative charges (electrons). Thus, sulfur has 16 electrons.
Protons and neutrons are in the nucleus and electrons are outside the nucleus.
Taking all the above into account, the correct answer is:
D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.
the radius of magnesium atom is 0.160nm. the radius of a magnesium ion is 7.2x 10^-11m. explain the difference in size between the magnesium atom and magnesium ion
Answer:
during reaction magnesium lises ions.
Explanation:
magnesium reacts by losing two ions which makes it smaller in size.
A steel cylinder has a pressure of 550 torr at 177 degrees Celsius. What will be the pressure if the temperature is decreased by 87 degrees Celsius?
Answer:
[tex]P_2=507.7torr[/tex]
Explanation:
Hello there!
In this case, when we have a gas that is undergoing a change in both pressure and temperature, we utilize the Gay-Lussac's equation as shown below:
[tex]\frac{T_2}{P_2}=\frac{T_1}{P_1}[/tex]
Thus, since we are given the initial pressure and temperature and the final temperature, we can compute the final pressure as shown below:
[tex]P_2=\frac{P_1}{T_1}*T_2[/tex]
So we plug in, by making sure the temperatures are in kelvins, to obtain:
[tex]P_2=\frac{550torr}{(117+273)K}*(87+273)K\\\\P_2=507.7torr[/tex]
Best regards!
if you want to know the identity of an unknown substance, what type of formula would you most likely want to know?
Answer:
Smell: Most chemists can identify solvents by their distinctive smells (though this is a pretty bad idea). ¹
Melting point: If you've got very pure crystals, you can use their melting point to figure out which of several possible chemicals you've got.
Explanation:
I hope this helps and pls mark me brainliest :)
Answer:
the answer to the question is smell
Calculate the amount of copper (in moles) in a 29.4 g pure copper sheet.
Answer:
Number of moles = 0.4626 (Approx)
Explanation:
Given:
Mass of copper = 29.4 gram
Find:
Number of moles
Computation:
Atomic mass of copper = 63.546
Number of moles = Mass / Atomic mass
Number of moles = 29.4 / 63.546
Number of moles = 0.4626 (Approx)
30 points.
Given 450.98 g of Cu(NO3)2, how many moles of Ag can be made? Provide your final answer rounded to two decimal places.
Cu + 2 AgNO3 → Cu(NO3)2 + 2 Ag
Answer:
The answer is 2.4moles of Ag
Explanation:
450.98g Cu(NO3)2/1 x 1mole/187.554g Cu(NO3)2 = 2.4moles Ag
Kate made some ice cubes from pure water.
She used a sensor to measure the temperature of the ice.
What temperature will the sensor show when the ice is melting?
............. °C
Answer:
The correct answer is - 0 degrees Celsius or 32 degrees Fahrenheit.
Explanation:
The pure water freezes below zero degrees Celsius and forms ice which is started to melt at zero degrees Celsius as it gets the heat from the surroundings. The change in the heat or temperature of matter leads to a change in the state of matter.
Kate will find that the ice cubes formed from the pure water started to melt at 0 degrees Celsius or 32 degrees Fahrenheit with the help of sensor she has.
Which of the following is true of cartilage?
absorbs shock
is relatively stretchy
does not attach to bone
is not considered connective tissue
Answer:
absorbs shock
Explanation:
Answer: absorbs shock
Explanation:
Choose the true statement(s) about ions.
a. Anions result when atoms gain an electron.
b. Cations have more protons than electrons.
c. Ions are atoms that have gained or lost neutrons.
d. Na+ has gained 1 proton and therefore has an overall charge of 1.
Answer: The TRUE statements about an ion includes:
a. Anions result when atoms gain an electron.
b. Cations have more protons than electrons.
Explanation:
The fundamental unit of matter is ATOM, which is the smallest particle of an element that can take part in a chemical reaction. The constituents of the atom are PROTON, NEUTRON and ELECTRONS.
The theory of the possible model of an atom and the position of each constituent within the atom was given by Lord Rutherford. The nucleus of an atom is made up of the protons and neutron while the electron revolves round it. IONS are formed when these atoms either gains or losses these electrons.
When an atom gains electrons to complete it's outermost shell, it acquires a negative charge. This is because the electrons are more than the protons. This type of atom is called an ANION
When an atom losses an electron, it in turn acquires a positive charge. This is because the proton are more than the electrons. This is called the CATION.
Therefore the true statement about ions is option a and b.
Option C is false because it is an electron that is either loss or gained to form an ion not Neurons. Option D is wrong because Na+ lost one electron to become positively charged.