Cemistry counting atoms in compounds worksheet#7.0.1

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Answer 1

Answer: We don't know what worksheet that is there is a lot of atom worksheets.
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Describe the relationship between Avogadro's number and one mole of any substance.
Consider the following reversible, exothermic chemical reaction: 2C2H2(g) + 5O2(g) ↔4CO2(g) + 2H2O(g) All BUT one of the conditions will cause equilibrium to shift right and produce more of the products. Which change will cause the reaction to shift to the left? A) adding oxygen B) adding CO2 C) increasing the pressure D) decreasing the temperature

CuCl2 + 2NaNO3 mc023-1.jpg Cu(NO3)2 + 2NaCl What is the percent yield of NaCl if 31.0 g of CuCl2 reacts with excess NaNO3 to produce 21.2 g of NaCl?

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The stoichiometric ratio of CuCl2 to NaCl is 1 is to 2. The stoichiometric ratio of 31.0 g CuCl2 is 26.95 grams of NaCl by converting the amount of CuCl2 to mole and multiplying by 0.5 and molar mass of NaCl.This amount is equal to 78.65% yield.

Which two substances are covalent compounds?(1) C6H12O6(s) and KI(s)
(2) C6H12O(s) and HCl(g)
(3) KI(s) and NaCl(s)
(4) NaCl(s) and HCl(g)

Answers

Answer is: (2) C6H12O(s) and HCl(g).

Covalent bond is bond between nonmetals.

Carbon, hydrogen, chlorine and oxygen are nonmetals.

Hydrogen chloride (HCl) has polar covalent bond between hydrogen and chlorine.

Potassium iodide (KI) and sodium chloride (NaCl) are ionic compounds.

Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).

Among the four options, option (2) C6H12O(s) and HCl(g) represent covalent compounds as they consist only of nonmetals.

The question asks which of the given sets of substances are covalent compounds. Covalent compounds are formed when two nonmetals combine. By looking at the given options, option (2) C6H12O(s) and HCl(g) correspond to covalent compounds. C6H12O(s) is glucose, a sugar composed of carbon (C), hydrogen (H), and oxygen (O) - all nonmetals. Likewise, HCl(g) is hydrochloric acid, composed of hydrogen (H), a nonmetal, and Chlorine (Cl), another nonmetal. The other options include substances like KI and NaCl which are ionic compounds, not covalent, because they are formed from a metal and nonmetal.

Learn more about Covalent Compounds here:

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Which two compounds have the same molecular formula but different chemical and physical properties?(1) CH3CH2Cl and CH3CH2Br
(2) CH3CHCH2 and CH3CH2CH3
(3) CH3CHO and CH3COCH3
(4) CH3CH2OH and CH3OCH3

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Answer is (4) - CH₃CH₂OH and CH₃OCH₃.

Both CH₃CH₂OH and CH₃OCH₃ have same molecular formula as C₂H₆O. But CH₃CH₂OH is an alcohol and CH₃OCH₃ is an ether.

Although two compounds have a same molecular formula, the atomic arrangement of those compounds differs from each other.

Hence, CH₃CH₂OH and CH₃OCH₃ are isomers of the formula C₂H₆O.

Due to the different arrangement of atoms, both compounds have different chemical and physical properties.

The answer is (4) CH3CH2OH and CH3OCH3. You need to figure out which pair has the same molecular formula which means that they have the same number of same atoms. Then you can get the write answer.

A solution of H2SO4(aq) with a molal concentration of 4.80 m has a density of 1.249 g/mL. What is the molar concentration of this solution?

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Imagine we have mass of solvent 1kg (1000g)
According to that: $molality =n(solute) / m(solvent) =\ \textgreater \ 4.8m = 4.8mole / 1kg$
= 4.8 mole * 98 g/mole = 470g
$m(H2SO4) = n(H2SO4)*Mr(H2SO4) =\ \textgreater \$ $=\ \textgreater \ Molarity = 4.8 mole / 1.2 L = 4 M$ m(H2SO4) which is =470g

m(solution) = m(H2SO4) + m(solvent) = 470 + 1000 = 1470 g
d(solution) = m(solution) / V(solution) =>
=> 1.249 g/mL = 1470 g / V(solution) =>
$Molarity = n(solute) / V(solution) =\ \textgreater \$

Answer: 4.078 M

Explanation:

Which statement correctly describes the phosphate ion, PO 3/4

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A phosphate is an inorganic chemical and a salt of phosphoric acid. A phosphate or organophosphate is an ester of phosphoric acid and is presented by the symbol PO3^-4. The phosphate ion is a polyatomic particle with the experimental equation PO3−4 and a molar mass of 94.97 g/mol. It comprises of one focal phosphorus iota encompassed by four oxygen iotas in a tetrahedral course of action.

If the momentum of a car is reduced by half, assuming mass did not change, what must also have been reduced by half?

Answers

Answer:

Velocity is halved

Explanation:

Momentum is contingent on mass and velocity. The quantity of motion in a body is called the momentum of the body.

Momentum = mass x velocity

Now, if mass does not change and momentum is reduced by half, it suggests that the velocity was reduced by half.

Velocity is directly related to momentum.

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