Question 1

Which of the following is a chemical change?

Accepted Answer

Rusting of iron

Question 2

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

Accepted Answer

Iron(III) chloride

Question 3

An atom of carbon-14 is represented as $$\mathrm{^{14}_{6}C}. $$How many neutrons does it have?

Accepted Answer

8

Question 4

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine ($$\mathrm{F})$$

Question 5

Which family of elements is known as the noble gases?

Accepted Answer

Group 18

Question 6

Which of the following molecules is polar?

Accepted Answer

Ammonia ($$\mathrm{NH_3$})$$

Question 7

Balance the following reaction: $$\mathrm{C_2H_6 + O_2$ \rightarrow CO_2$ + H_2O}. $$What is the coefficient for $$\mathrm{O_2$}$$?

Accepted Answer

3.5

Question 8

Which of the following is a correct net ionic equation for the reaction between aqueous solutions of $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$}$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s)}$$

Question 9

Which of the following best explains why water ($$\mathrm{H_2O}) $$has a higher boiling point than methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Water forms hydrogen bonds, which are stronger than the London dispersion forces in methane

Question 10

A sample of gas occupies $$2.0\ \mathrm{L} at$$ $$1.0\ \mathrm{atm}$$ and $$300\ \mathrm{K}. $$What will be its volume at $$2.0\ \mathrm{atm}$$ and $$300\ \mathrm{K}$$? (Assume ideal gas behavior.)

Accepted Answer

$$1.0\ \mathrm{L}$$

Question 11

Which of the following is the correct electron configuration for a $$\mathrm{Cl^-}$$ ion?

Accepted Answer

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

Question 12

What is the molarity of a solution prepared by dissolving $$10.0\ \mathrm{g} of$$ $$\mathrm{NaCl} ($$molar mass $$= 58.44\ \mathrm{g/mol}) in $$enough water to make $$500.0\ \mathrm{mL} of $$solution?

Accepted Answer

$$0.171\ \mathrm{M}$$

Question 13

A radioactive isotope has a half-life of $$3.0\ \mathrm{hours}. If $$you start with $$80.0\ \mathrm{g}$$, how much remains after $$9.0\ \mathrm{hours}$$?

Accepted Answer

$$10.0\ \mathrm{g}$$

Question 14

Which of the following is the empirical formula for a compound with $$40.0\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 15

Which of the following is a structural isomer of $$\mathrm{C_4H_{10}}$$?

Accepted Answer

2-methylpropane

Question 16

A $$25.0\ \mathrm{mL}$$ sample of $$0.200\ \mathrm{M}$$ $$\mathrm{HCl} is $$diluted to $$100.0\ \mathrm{mL}. $$What is the new concentration?

Accepted Answer

$$0.0500\ \mathrm{M}$$

Question 17

Which of the following functional groups is present in ethanol?

Accepted Answer

Alcohol

Question 18

A reaction has a theoretical yield of $$5.00\ \mathrm{g}$$, but only $$3.75\ \mathrm{g} is $$obtained. What is the percent yield?

Accepted Answer

$$75.0\%$$

Question 19

Which of the following statements about acids and bases is correct?

Accepted Answer

An acid donates protons ($$\mathrm{H^+}) in $$aqueous solution

Question 20

Which of the following best describes the trend in atomic radius across a period from left to right?

Accepted Answer

Atomic radius decreases

Introductory Chemistry Final Exam Review: Key Concepts and Calculations

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