Question 1

Which of the following numbers contains exactly three significant figures?

Accepted Answer

$$0.0300$$

Question 2

A student measures the mass of a sample as $$12.345 g $$and the volume as $$6.7 mL. $$What is the density, reported with the correct number of significant figures?

Accepted Answer

$$1.8$$ \ \mathrm{g/mL}$

Question 3

Convert $$77$$ $$^{\circ}\mathrm{F} to$$ $$^{\circ}\mathrm{C}$$ using the correct formula.

Accepted Answer

$$25$$ \ ^{\circ}\mathrm{C}$

Question 4

Which separation technique would be most appropriate for separating a mixture of salt dissolved in water?

Accepted Answer

Distillation

Question 5

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad dressing (oil and vinegar)

Question 6

Which WHMIS pictogram indicates a substance that is both flammable and can cause acute toxicity?

Accepted Answer

The flame and skull-and-crossbones symbols

Question 7

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Azimuthal quantum number ($$l)$$

Question 8

How many electrons can occupy the $$3p$$ subshell?

Accepted Answer

$$6$$

Question 9

Which of the following electron configurations represents a neutral oxygen atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 10

Which of the following elements is most likely to form a cation with a $$+1$$ charge?

Accepted Answer

Sodium

Question 11

Which of the following statements about hydrogen bonding is correct?

Accepted Answer

Hydrogen bonding occurs when hydrogen is directly bonded to F, O, or N.

Question 12

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting in moist air

Question 13

What is the molar mass of $$\mathrm{Ca(OH)_2}$$?

Accepted Answer

$$74.10$$ \ \mathrm{g/mol}$

Question 14

A reaction has a theoretical yield of $$10.0 g$$, but only $$7.5 g of $$product is obtained. What is the percent yield?

Accepted Answer

$$75\%$$

Question 15

Which of the following best explains why water has a higher boiling point than methane?

Accepted Answer

Water molecules form hydrogen bonds, which are stronger than the London dispersion forces in methane.

Question 16

Which of the following is the correct Lewis structure for carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 17

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

Accepted Answer

Atomic radius decreases

Question 18

A $$25.00 mL $$sample of $$0.100 M$$ $$\mathrm{HCl} is $$titrated with $$0.200 M$$ $$\mathrm{NaOH}. $$What volume of $$\mathrm{NaOH} is $$required to reach the equivalence point?

Accepted Answer

$$12.50$$ \ \mathrm{mL}$

Question 19

Which of the following is a correct balanced equation for the reaction of sodium with water?

Accepted Answer

$$2\mathrm{Na} + 2\mathrm{H_2O} \rightarrow 2\mathrm{NaOH} + \mathrm{H_2$}$$

Question 20

Which of the following laboratory glassware is best for measuring $$25.00 mL of a $$solution with the highest precision?

Accepted Answer

Buret

General Chemistry I: Final Exam Study Guide – Matter, Measurement, Atomic Structure, Periodicity, Bonding, and Stoichiometry

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