Q: What is the correct formula for calculating the number of moles from mass and molar mass?

$$\text{moles} = \frac{\text{mass}}{\text{molar mass}}$$

Q: A sample contains $$2.50 \text{ mol} of$$ $$\text{NaCl}. $$How many formula units of $$\text{NaCl}$$ are present?

$$2.50 \times 6.022 \times 10$$^{23}$$

Q: Which of the following is the correct balanced equation for the combustion of methane ($$\text{CH}_4$$)?

$$\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}$$

Q: Which conversion factor would you use to convert from moles to molecules?

$$6.022 \times 10$$^{23}$$ molecules/1 mol

Question 1

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 2

What is the correct formula for calculating the number of moles from mass and molar mass?

Accepted Answer

$$	ext{moles} = \frac{	ext{mass}}{	ext{molar mass}}$$

Question 3

A sample contains $$2.50 	ext{ mol} of$$ $$	ext{NaCl}. $$How many formula units of $$	ext{NaCl}$$ are present?

Accepted Answer

$$2.50 	imes 6.022 	imes 10$$^{23}$$

Question 4

Which of the following acids is correctly named?

Accepted Answer

H$$_2SO$_4$$: sulfuric acid

Question 5

What is the mass number ($$A) of an $$atom with 17 protons and 18 neutrons?

Accepted Answer

$$A = 35$$

Question 6

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 7

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

Question 8

Which of the following is the correct name for the ion $$	ext{HCO}_3^-$$?

Accepted Answer

Hydrogen carbonate

Question 9

A room measures $$5 	ext{ m} 	imes 6 	ext{ m} 	imes 4 	ext{ m}. $$The density of air is $$1.19 	ext{ g/L}$$ and each $$1.00 	ext{ L} of $$air contains $$0.21 	ext{ g} of $$oxygen. What is the mass of oxygen in the room in kilograms?

Accepted Answer

$$30 	ext{ kg}$$

Question 10

Which of the following is the correct empirical formula for a compound containing 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$$	ext{CH}_2	ext{O}$$

Question 11

Which of the following is the correct name for $$	ext{ClO}_2^-$$?

Accepted Answer

Chlorite

Question 12

A chemical reaction produces 12.0 g of product, but the theoretical yield is 15.0 g. What is the percent yield?

Accepted Answer

$$80\%$$

Question 13

Which of the following is the correct balanced equation for the combustion of methane ($$	ext{CH}_4$$)?

Accepted Answer

$$	ext{CH}_4 + 2	ext{O}_2 ightarrow 	ext{CO}_2 + 2	ext{H}_2	ext{O}$$

Question 14

Which conversion factor would you use to convert from moles to molecules?

Accepted Answer

$$6.022 	imes 10$$^{23}$$ molecules/1 mol

Question 15

Which of the following is a correct statement about significant figures in multiplication and division?

Accepted Answer

The answer should have the same number of significant figures as the measurement with the fewest significant figures.

Question 16

Which of the following is the correct name for $$	ext{PO}_4$$^{3-}$$?

Accepted Answer

Phosphate ion

Question 17

Which of the following is NOT a physical property?

Accepted Answer

Corrosiveness

Question 18

If you add 2.47 and 3.1, how many significant figures should your answer have?

Accepted Answer

1

Question 19

Which of the following is the correct formula for calculating the number of neutrons in an atom?

Accepted Answer

$$n^0 = A - Z$

General Chemistry Exam 1 Review: Matter, Measurement, Atoms, and Stoichiometry

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