Answer:
six electrons
Explanation:
The six electrons in the outermost shell allow selenium to have a variety of valence numbers. Selenium compounds have been found that have valences of -2, 4, and 6. Speaking of the number six, selenium is found to have six naturally occurring isotopes.
What advantage does a heterogeneous catalyst provide over a homogeneous catalyst in industrial processes?
Answer:
A heterogeneous catalyst can be easily separated from reactants.
Explanation:
where is a tornado most likey from
Answer:
If I'm correct i believe that the answer is A.
Answer:
A. Where warm moist air masses traveling north collide with cool dry air masses traveling south
Explanation:
I got it right
What is the mass of 0.2 mole of oxygen atoms.
Please answer step by step.
[tex]\huge\boxed{3.2 Grams}[/tex]
_____________________________________Moles:Moles is the unit which measures the amount of substance in the System International (SI). A mole is the amount of substance that contains the same amount of substance as the amount of substance exactly in exactly 12 g of carbon-12. C-12 is the standard to measure moles.
I have attached the Equations for moles.
_____________________________________For this question we will use the formula,
[tex]Moles = \frac{Given Mass}{Atomic Mass}[/tex]
Rearrange the equation,
[tex]Mass = (Moles)x(Atomic Mass)[/tex]
Given:
Moles = 0.2
Molecular Mass of Oxygen Atom(Not molecule) = 16
Thus,
[tex]Mass = (0.2)x(16)\\\\Mass = 3.2 grams[/tex]
The mass of 0.2 moles of oxygen atom is 3.2 grams.
_____________________________________Best Regards,'Borz'A 24.63 gram sample of cobalt is heated in the presence of excess oxygen. A metal oxide is formed with a mass of 31.32 g. Determine the empirical formula of the metal oxide.
Explanation:
Moles of Co = 24.63 / 58.9 = 0.418
Moles of O = (31.32 - 24.63) / 16 = 0.418
Since the mole ratio is 1 : 1, the empirical formula is CoO.
The empirical formula of the metal oxide is CaO₂.
What is the empirical formula?The empirical formula is the simplest ratio of the number of atoms participating in the formation of a compound.
The chemical formula of any compound is based on two types of formula one is molecular formulas and another one is empirical formulas. Both the molecular formula and empirical formula represent the identity and number of the atom.
Given, the mass of the sample of the cobalt = 24.63g
The mass of the metal oxide = 31.32g
From the law of the conservation of mass:
The mass of the metal oxide - Mass of cobalt = mass of the oxygen
So the mass of the oxygen = 31.32 - 24.63 = 6.69 g
If mass 59 grams of the cobalt has moles = 1
Then 24.63 g of Cobalt will have moles = 24.63/59 = 0.417 mol
Similarly, 8 grams of the oxygen gas moles = 1
Then 6.69g of the oxygen has moles = 6.69/8 = 0.8362 mol
The simplest ratio of moles for Co = 0.417/0.417 = 1
For oxygen = 0.8362/0.417 = 2
Therefore the empirical formula of the metal oxide is CaO₂.
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how many moles of CO2 are in 210 liters at STP of the compound
Answer:
9.4 mol CO₂
General Formulas and Concepts:
Chemistry - Gas Laws
Using Dimensional AnalysisSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KExplanation:
Step 1: Define
210 L CO₂ at STP
Step 2: Identify Conversions
22.4 L = 1 mol at STP
Step 3: Convert
[tex]210 \ L \ CO_2(\frac{1 \ mol \ CO_2}{22.4 \ L \ CO_2} )[/tex] = 9.375 mol CO₂
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
9.375 mol CO₂ ≈ 9.4 mol CO₂
Do you think chemistry has something to do with your life?In not less than 5 sentences but not more than 10 sentences try to identify situations during the day in which chemistry somehow played a part
Answer:
Chemistry can be applicable in many aspects which are
i) At school, through getting knowledge you can assess different aspect of chemistry, eg production of Chemicals.
ii) At hospital, also chemistry can be applicable in hospital because most of medicine and other materials are made up from chemistry application.
iii) Agriculture, through agricultural materials it simply because you can get more efficient through planted by using manures and fertilizer which are made up from chemistry application.
What do asteroids have in common with earth?
For the chemical reaction:
ALOH3 (s)
= Al2O3 (s)
+ H20 (l)
Calculate the mass of water formed when 100 g of Al(OH)3 is heated. (AI = 27: 0 - 16; H = 1)
Answer:
35.1 g
Explanation:
Given data:
Mass of Al(OH)₃ = 100 g
Mass of water formed = ?
Solution:
Chemical equation:
2Al(OH)₃ → Al₂O₃ + 3H₂O
Number of moles of Al(OH)₃:
Number of moles = mass/molar mass
Number of moles = 100 g/ 78 g/mol
Number of moles = 1.3 mol
now we will compare the moles of Al(OH)₃ with water.
Al(OH)₃ : H₂O
2 : 3
1.3 : 3/2×1.3 = 1.95
Mass of water produced:
Mass = number of moles ×molar mass
Mass = 1.95 mol × 18 g/mol
Mass = 35.1 g
whats the answer giving brainliest please help
Answer:
C (I think)
Explanation:
the levels are higher than they have ever been
During science lab, Jacob mixes together sodium hydroxide (NaOH) and hydrochloric acid (HCl). The two chemicals react to form sodium chloride (NaCl) and water (H2O).
Which of the following are reactants in the chemical reaction described above?
A.
hydrochloric acid and water
B.
sodium hydroxide and hydrochloric acid
C.
sodium hydroxide and sodium chloride
D.
sodium chloride and water
B. Sodium hydroxide and Hydrochloric acid
Further explanationChemical equations can be expressed in terms of
word reaction formula reactionIn a chemical reaction, there are several components, including reactants, products, and compounds that react in the form of solids, gases, and liquids
Reactants are compounds that react and form products
The reactants are generally to the left of the chemical equation and the products are to the right of the reaction
The statement of the word reaction above can be expressed by the reaction formula
[tex]\tt NaOH+HCl\rightarrow NaCl+H_2O[/tex]
This reaction is called a neutralization reaction because it involves acids(HCl) and bases(NaOH) and produces salt(NaCl)and water(H₂O)
From the reaction above, the reactants on the left are NaOH and HCl compounds
Which best describes the path of solar radiation? from the surface of the Earth to the Sun, where it is absorbed from the Sun to the surface of the Earth, where it is absorbed or reflected from the surface of the Earth to the Sun, where it is absorbed or reflected from the Sun to the surface of the Earth, where it is reflected
Answer:
from the Sun to the surface of the Earth, where it is absorbed or reflected
Explanation:
The solar radiation that emerges out of the sun and that reaches the surface of the Earth is sunlight. There are numerous constituents and particles present in the atmosphere that absorbs the solar radiation. These radiations are weakened by these constituents. Later, these radiations gets scattered in the atmosphere. Some amount of he solar radiation that reaches the Earth's surface is absorbed and some is reflected back.
Answer:
B
Explanation:
An unknown organic compound composed of carbon, hydrogen, and oxygen was analyzed and found to be 50.84% C, 8.53% H, and the rest oxygen. What is the empirical formula
In every 100g of that compund there is 50.84 g of C, 8.53 g H and (100-59.37) g = 40.63 g of O.
Step 1: Convert each element's mass in moles. To do that we need to divide each element's mass by their respective molar mass.
For Carbon.
[tex]C = \frac{50.84}{12} = 4.24 mol [/tex]
For Hydrogen.
[tex]H = \frac{8.53}{1} = 8.53 mol [/tex]
For Oxygen.
[tex]O = \frac{40.63}{16} = 2.54 mol [/tex]
Step 2: Divide each of the numbers by the smallest number.
For Carbon.
[tex]C = \frac{4.24}{2.54} = 1.7 [/tex]
For Hydrogen.
[tex]H = \frac{8.53}{2.54} = 3.36 [/tex]
For Oxygen.
[tex]O = \frac{2.54}{2.54} = 1 [/tex]
Step 3: So the empirical formula will be.
[tex] C_{1.7} H_{3.36} O_1 [/tex]
But using decimal will be messy. So we multiply the numbers by 3. The right empirical formula will be.
[tex] C_{5} H_{10} O_3 [/tex]
The empirical formula of an organic compound that contains 50.84% C, 8.53% H, and the rest oxygen is C₅H₁₀O₃.
First, we have to determine the mass percentage of oxygen, knowing that C, H and O amount to the 100% of the compound.
[tex]C + H + O = 100\%\\O = 100\% - C - H\\O = 100\% - 50.84\% - 8.53\% = 40.63\%[/tex]
Then, we divide each mass percentage by the atomic mass of the element.
[tex]C: 50.84/12.01 = 4.23\\H: 8.53/1.01 = 8.45\\O: 40.63/16.00 = 2.54[/tex]
Afterwards, we divide all the numbers by the smallest one, i.e. 2.54.
[tex]C: 4.23/2.54 = 1.66\\H: 8.45/2.54 = 3.33\\O: 2.54/2.54 = 1[/tex]
Finally, we multiply all the numbers by 3, so that they are all integers.
[tex]C: 1.66 \times 3 \approx 5\\H: 3.33 \times 3 \approx 10\\O: 1 \times 3 = 3[/tex]
The empirical formula of the organic compound is C₅H₁₀O₃.
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CAN SOMEONE PLEASE SEND ME A FILE FOR THE PROJECT
Answer:
ca you attach these two pdf ?? or provide the link to this document
If the enantiomeric excess of a mixture is 81 %, what are the percent compositions of the major and minor enantiomer?
Answer:
major enantiomer = 90.5 %
minor enantiomer = 9.5 %
Explanation:
Assuming that the major isomer is in excess;
From, ee/2 + 50
ee = enantiomeric excess = 81%
% major =81/2 + 50 = 90.5 %
% minor = 100% - 90.5 %
% minor = 9.5 %
help help
What are the cells that respond to stimuli called?
Answer:
receptors which detect stimuli changes in the environment
Explanation:
What is the wavelength (in nm) of
blue light that has a frequency of
6.69 x 1014 s=?? (c = 3.00 x 108 m/s)
Answer:
λ = 0.45×10⁻⁶ m
Explanation:
Given data:
Wavelength of blue light = ?
Frequency of blue light = 6.69×10¹⁴ s⁻¹
Solution:
Formula;
Speed of wave = wavelength × frequency
Speed of wave = 3.00×10⁸ m/s
by putting vales,
3.00×10⁸ m/s = λ × 6.69×10¹⁴ s⁻¹
λ = 3.00×10⁸ m/s / 6.69×10¹⁴ s⁻¹
λ = 0.45×10⁻⁶ m
A student predicted the reaction between hydrogen and oxygen gas would yield 125 of water. However, after measuring the water formed in the reaction, student determined that only 110 of water was actually formed. What is the percent yield of this reaction ?
Help
How many liters of 0.305 m K3PO4 solution are necessary to completely react with 187 ml of 0.0184M NiCl2 according to the balanced chemical reaction:
2 K3PO4(aq) + 3NiCl2(aq)>Ni3(PO4)2(s) +6 KCl(aq)
Answer:
0.00752L of 0.305M K₃PO₄
Explanation:
Based on the balanced chemical equation, 2 moles of K₃PO₄ react with 3 moles of NiCl₂.
To find the volume of K₃PO₄ we need to determine the moles of this compound required for a complete reaction finding moles of NiCl₂ and using the chemical equation:
Moles NiCl₂:
187mL = 0.187L * (0.0184mol / L) = 0.00344 moles NiCl₂
Moles K₃PO₄:
As 2 moles of K₃PO₄ react with 3 moles of NiCl₂:
0.00344 moles NiCl₂ * (2 mol K₃PO₄ / 3 moles NiCl₂) =
0.002294 moles of K₃PO₄
Volume of 0.305M K₃PO₄:
0.002294 moles of K₃PO₄ * (1L / 0.305moles K₃PO₄) =
0.00752L of 0.305M K₃PO₄
If an element has 3 valence electrons, what charge will likely form on its ion
The element will lose electrons to become stable if the valence shell contains 3 or fewer electrons. The production of cations is a sign of electron loss. The species having positive charge are called cations. As a result, the ion will get a positive charge.
What is ion ?An atom or molecule with a net electrical charge is known as an ion. Conventionally, the charge of an electron is thought to be negative; this charge is equal to and opposite to the charge of a proton, which is thought to be positive.
An atom will shed its valence electrons in order to become a charged ion and create an ionic bond with another atom if it lacks one to three of them.
A positive ion is created by taking electrons from a neutral atom, whereas a negative ion is created by adding electrons to a neutral atom. The quantity of protons remains constant during the formation of an ion.
Thus, the ion will get a positive charge.
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write the detailed structure of
A. C2H6 B. C4H10 C. C6H14 D. C7H16
A.
H₃C-CH₃
this is called ethane
B.
H₃C-CH₂-CH₂-CH₃
this is called butane
C.H₃C-CH₂-CH₂-CH₂-CH₂-CH₃
this is called hexane
D.
H₃C-CH₂-CH₂-CH₂-CH₂-CH₂-CH₃
this is called heptane
Answer:
1. a) Ethane (C2H6)
2. b) Butane (C4H10 )
3. c) Hexane (C6H14)
4. d) Heptane (C7H16)
Acetaminophen is the active ingredient in Tylenol.
a. Write the molecular formula of the compound.
b. What is the hybridization state of each C, N, and O atom?
Explanation:
a. Write the molecular formula of the compound.
Acetaminophen contains 8 carbon atoms, 9 Hydrogen atoms, 1 Nitrogen atom and 2 Oxygen atoms.
The molecular formular is given as; C8H9NO2
b. What is the hybridization state of each C, N, and O atom?
From the image attached;
All the carbon atoms in the benzene ring has hybridization of sp2.
The carbon that is doubly bonded (carbonyl) to the oxygen has hybridization of sp2
The last carbon to the right has hybridization of sp3
The hybridization of nitrogen in the compound is sp3 hbridized.
Oxygen atom in alcohol is sp3 hybridised
Oxgen in the carbonyl group is sp2 hybridized.
One sugar produced by photosynthesis is called
what is the atomic mass of an atom equal to?
Answer: A property closely related to an atom's mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.
Hope this helps....... Stay safe and have a Merry Christmas!!!!!!!! :D
Acetylene gas is often used in welding torches because of the very high heat produced when it reacts with oxygen O2 gas, producing carbon dioxide gas and water vapor. Calculate the moles of oxygen needed to produce 1.3mol of carbon dioxide. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits.
Answer:
3.2 moles of carbon dioxide
Explanation:
When C₂H₂ reacts with O₂ the chemical reaction is:
C₂H₂ + 5/2O₂ → 2CO₂ + H₂O
Where 1 mole of acetylene produce 2 moles of carbon dioxide.
Based on the chemical equation of this reaction, there are produced twice the moles of acetylene in moles of carbon dioxide assuming a compete reaction.
If 1.6 moles of acetylene reacts there are produced:
1.6 moles Acetylene * (2 moles Carbon Dioxide / 1 mole Acetylene) =
3.2 moles of carbon dioxide
calculate the packing efficiency of simple cubic unit cell.
Answer:
52.4%
Explanation:
Since a simple cubic unit cell contains only 1 atom. The packing efficiency of the simple cubic cell is 52.4 %
Two nitrogen atoms form a diatomic molecule. Which type of bond is most likely to be formed in the case of a diatomic nitrogen molecule?
A. Single Bond
B.Double Bond
C.Triple Bond
D.Ionic Bond
Explanation:
It's a triple bond for nitrogen,double bond for oxygen(just saying)
The temperature of a plastic cup is 70 °F. It is filled with water that is
40 °F. Which of the following describes how thermal energy is
transferred?
Answer:
From the plastic cup to the water
Explanation:
The thermal energy is transferred from the plastic cup to the water inside the cup.
This is because thermal energy moves from a body at high temperature to one at lower temperature.
Thermal energy is the energy due to the motion of the particles of a medium. An increase in thermal energy leads to a rise in the average kinetic energy of the system. It moves over a gradient usually from a body with a high temperature to one at a lower temperature.Determine the oxidation number of chlorine in CI2 with the steps
Answer: The oxidation number of chlorine in [tex]Cl_2[/tex] is zero
Explanation:
Oxidation number or oxidation state : It represent the number of electrons lost or gained by the atoms of an element in a compound.
Rules for Oxidation Numbers are :
1. The oxidation number of a free element is always zero.
2. The oxidation number of a monatomic ion equals the charge of the ion.
3. The oxidation number of oxygen (O) in compounds is usually -2.
4. The oxidation number of a Group 17 element in a binary compound is -1.
5. The oxidation number of Hydrogen (H) is +1, but it is -1 in when combined with less electronegative elements.
6. The sum of the oxidation numbers of all of the atoms in a neutral compound is zero.
7. The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.
As [tex]Cl_2[/tex] exists as a free molecule, its oxidation state is zero.
Question 1
The Relationship of Potential Energy is that when
increases or
increases, Potential Energy will increase also.
A
speed in a given direction
B
the amount of matter in an object
С
is a measurement for the amount of energy
D
Mass, Height
E
Mass, Velocity
What is the molar concentration (in moles/L) of a solution made with 3.744 g of Mg(NO3)2 dissolved in enough water to make 50.0 mL of solution?
Answer:
The molar concentration of a solution made with 3.744 g of Mg(NO₃)₂ dissolved in enough water to make 50.0 mL of solution is [tex]0.5 \frac{moles}{L}[/tex]
Explanation:
Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]molarity=\frac{number of moles}{volume}[/tex]
In this case:
Mg: 24.3 g/moleN: 14 g/moleO: 16 g/moleSo, the molar mass of Mg(NO₃)₂ is:
Mg(NO₃)₂= 24.3 g/mole + 2*(14 g/mole + 3*16 g/mole)= 148.3 g/mole
So, if you have 3.744 g of Mg(NO₃)₂, you can apply the following rule of three: if 148.3 grams of Mg(NO₃)₂ are present in 1 mole, 3.744 grams in how many moles are present?
[tex]moles=\frac{3.744 grams*1mole}{148.3 grams}[/tex]
moles= 0.025
Then you have:
number of moles=0.025volume= 50 mL= 0.05 L (being 1,000 mL= 1 L)Replacing in the definition of molarity:
[tex]molarity=\frac{0.025 moles}{0.05 L}[/tex]
you get:
[tex]molarity=0.5 \frac{moles}{L}[/tex]
The molar concentration of a solution made with 3.744 g of Mg(NO₃)₂ dissolved in enough water to make 50.0 mL of solution is [tex]0.5 \frac{moles}{L}[/tex]
The molar concentration of the solution is 0.506 M
The molar concentration of a solution is known as molarity. The molarity of a solution is defined as the moles of a solute per liter of a solution.
It can be expressed as:
[tex]\mathbf{Molarity = \dfrac{moles \ of \ solute}{volume \ of \ the \ solution}}[/tex]
The molar mass of magnesium nitrate Mg(NO3)2 = 148.3 g/molThe mass of the solute Mg(NO3)2 = 3.744 gThe relation used in determining the number of moles is:
[tex]\mathbf {number \ of \ moles = \dfrac{mass}{molar \ mass}}[/tex]
[tex]\mathbf {number \ of \ moles = \dfrac{3.744 \ g}{148.3 \ g/mol}}[/tex]
[tex]\mathbf {number \ of \ moles = 0.0253 \ g/mol}[/tex]
∴
[tex]\mathbf{Molarity = \dfrac{moles \ of \ solute}{volume \ of \ the \ solution}}[/tex]
[tex]\mathbf{Molarity = \dfrac{0.0253 \ g/mol}{0.05 \ L}}[/tex]
[tex]\mathbf{Molarity =0.506 \ M}[/tex]
Therefore, we can conclude that the molar concentration of the solution is 0.506 M
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