Q: A sample of a compound contains 12.0 g of carbon and 32.0 g of oxygen. What is the percent by mass of carbon in the compound?

$$\frac{12.0}{12.0 + 32.0} \times 100 = 27.3\%$$

Q: How many atoms are present in 2.00 moles of sodium?

$$2.00 \times 6.022 \times 10$$^{23}$$ = 1.204 \times 10$$^{24}$$ atoms

Q: A sample contains 3.01 $$\times$$ $$10^{23}$$ molecules of water. How many moles of water are present?

$$\frac{3.01 \times 10$$^{23}$$}{6.022 \times 10$$^{23}$$} = 0.500$$ moles

Q: A student needs to convert 5.00 inches to centimeters. What is the correct answer using the conversion $$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$?

$$5.00 \times 2.54 = 12.7\ \mathrm{cm}$$

Question 1

Which of the following statements best describes the Law of Conservation of Mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 2

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 3

A sample of a compound contains 12.0 g of carbon and 32.0 g of oxygen. What is the percent by mass of carbon in the compound?

Accepted Answer

$$\frac{12.0}{12.0 + 32.0} 	imes 100 = 27.3\%$$

Question 4

Which of the following ions is polyatomic and carries a -2 charge?

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 5

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

Accepted Answer

Mass

Question 6

What is the correct name for the compound $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 7

How many atoms are present in 2.00 moles of sodium?

Accepted Answer

$$2.00 	imes 6.022 	imes 10$$^{23}$$ = 1.204 	imes 10$$^{24}$$ atoms

Question 8

Which of the following correctly lists the diatomic elements?

Accepted Answer

Hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine

Question 9

A student measures the mass of a liquid as 25.0 g and its volume as 20.0 mL. What is the density of the liquid?

Accepted Answer

$$\frac{25.0\ \mathrm{g}}{20.0\ \mathrm{mL}} = 1.25\ \mathrm{g/mL}$$

Question 10

Which of the following is the correct electron configuration for a neutral atom of magnesium (atomic number 12)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$

Question 11

Which of the following is the correct name for $$\mathrm{Na_2CO_3}$$?

Accepted Answer

Sodium carbonate

Question 12

A sample contains 3.01 $$	imes$$ $$10^{23}$$ molecules of water. How many moles of water are present?

Accepted Answer

$$\frac{3.01 	imes 10$$^{23}$$}{6.022 	imes 10$$^{23}$$} = 0.500$$ moles

Question 13

Which of the following is the correct formula for the compound formed between calcium and nitrate?

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 14

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 15

Which of the following is the correct name for $$\mathrm{K_2SO_4}$$?

Accepted Answer

Potassium sulfate

Question 16

A student needs to convert 5.00 inches to centimeters. What is the correct answer using the conversion $$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$?

Accepted Answer

$$5.00 	imes 2.54 = 12.7\ \mathrm{cm}$$

Question 17

Which of the following is the correct formula for the acetate ion?

Accepted Answer

$$\mathrm{CH_3COO^-}$$

Question 18

Which of the following is the correct name for $$\mathrm{H_2SO_4}$$?

Accepted Answer

Sulfuric acid

Question 19

Which of the following is the correct formula for the compound dinitrogen pentoxide?

Accepted Answer

$$\mathrm{N_2O_5}$$

Question 20

Which of the following is the correct name for $$\mathrm{$$CuSO_4$$}$$?

Accepted Answer

Copper(II) sulfate

General Chemistry Exam Study Guide: Chapters 1–3, Nomenclature, and Key Concepts

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