Question 1

Which of the following is a chemical change?

Accepted Answer

Burning of magnesium ribbon in air

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 contain?

Accepted Answer

8

Question 4

Which of the following elements has the highest electronegativity?

Accepted Answer

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

Question 5

Which of the following is a correct balanced equation for the reaction between aluminum and hydrochloric acid?

Accepted Answer

$$\mathrm{2Al + 6HCl \rightarrow 2AlCl_3 + 3H_2}$$

Question 6

Which of the following molecules is polar?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 7

What is the net ionic equation for the reaction between aqueous solutions of sodium sulfate and barium chloride?

Accepted Answer

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

Question 8

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 between its molecules.

Question 9

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 $$300\ \mathrm{K}$$, assuming ideal gas behavior?

Accepted Answer

$$1.0\ \mathrm{L}$$

Question 10

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

Accepted Answer

$$\mathrm{1s^2$\ 2s^2$\ 2p^6$\ 3s^2$\ 3p^6$}$$

Question 11

Which of the following organic compounds is an alcohol?

Accepted Answer

Ethanol ($$\mathrm{CH_3CH_2OH})$$

Question 12

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

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 13

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 14

A radioactive isotope has a half-life of $$5$$ days. If you start with $$80\ \mathrm{g}$$, how much remains after $$15$$ days?

Accepted Answer

$$10\ \mathrm{g}$$

Question 15

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

Accepted Answer

Atomic radius decreases due to increased nuclear charge.

Question 16

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 17

Which of the following is a property of bases?

Accepted Answer

They taste bitter and feel slippery.

Question 18

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

Accepted Answer

$$0.0500\ \mathrm{M}$$

Question 19

Which of the following pairs are structural isomers?

Accepted Answer

Butane ($$\mathrm{C_4H_{10}}) $$and isobutane ($$\mathrm{C_4H_{10}})$$

Question 20

A reaction has a theoretical yield of $$5.00\ \mathrm{g}$$ and an actual yield of $$4.00\ \mathrm{g}. $$What is the percent yield?

Accepted Answer

$$80.0\%$$

Introductory Chemistry Final Exam Review: Concepts and Calculations

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