Question 1

Which of the following statements best distinguishes between a pure substance and a mixture?

Accepted Answer

A pure substance has a fixed composition, while a mixture can have variable composition.

Question 2

A student measures the mass of a sample as 12.340 g. How many significant figures are in this measurement?

Accepted Answer

$$5$$

Question 3

Which of the following is the correct formula to convert a temperature from Celsius ($$^{\circ}\mathrm{C}) to $$Kelvin ($$K$$)?

Accepted Answer

$$K = ^{\circ}\mathrm{C} + 273.15$$

Question 4

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 5

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

Accepted Answer

$$0.5$$ mol

Question 6

Which of the following is a correct statement of Dalton's Atomic Theory?

Accepted Answer

Atoms of a given element are identical in mass and properties.

Question 7

Which of the following elements is an alkaline earth metal?

Accepted Answer

Mg

Question 8

A compound contains $$40.0\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 9

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two nonmetals.

Question 10

Which of the following is the correct name for $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 11

A student needs to prepare $$250 mL of a$$ $$0.100 M $$NaCl solution. How many grams of NaCl are required? ($$\mathrm{Molar\ mass\ of\ NaCl} = 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$1.46 g$$

Question 12

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{SO}_4$$^{2-}$$

Question 13

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

Accepted Answer

$$\mathrm{N}_2\mathrm{O}_5$$

Question 14

Which of the following is the correct name for $$\mathrm{H}_2\mathrm{SO}_4$$?

Accepted Answer

Sulfuric acid

Question 15

A sample of glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6) $$contains $$0.50$$ mol. How many molecules of glucose are present?

Accepted Answer

$$3.01 	imes 10$$^{23}$$

Question 16

Which of the following statements about ions is correct?

Accepted Answer

An anion is formed when an atom gains one or more electrons.

Question 17

Which of the following is the correct electron configuration for a neutral atom of sodium ($$Z=11$$)?

Accepted Answer

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

Question 18

Which of the following is a correct statement about the periodic table?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 19

A compound is found to contain $$24.0 g of $$carbon, $$4.0 g of $$hydrogen, and $$32.0 g of $$oxygen. What is the empirical formula?

Accepted Answer

$$\mathrm{C}_2\mathrm{H}_4\mathrm{O}_2$$

Question 20

Which of the following is the correct IUPAC name for $$\mathrm{KNO}_3$$?

Accepted Answer

Potassium nitrate

General Chemistry Study Guide: Atomic Structure, Measurement, and Chemical Nomenclature

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