Question 1

A patient weighs 154 pounds. Using the conversion $$1 \ 	ext{kg} = 2.205 \ 	ext{pounds}$$, what is the patient's mass in kilograms, rounded to three significant figures?

Accepted Answer

$$69.8 \ 	ext{kg}$$

Question 2

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 3

A solution contains $$25.0 \ 	ext{g} of $$NaCl dissolved in $$250.0 \ 	ext{mL} of $$water. What is the concentration in $$	ext{g/mL}$$, expressed with the correct number of significant figures?

Accepted Answer

$$0.100 \ 	ext{g/mL}$$

Question 4

Which of the following elements is a metalloid according to the periodic table provided?

Accepted Answer

Si

Question 5

Which of the following best describes the trend in atomic radius as you move down a group in the periodic table?

Accepted Answer

Atomic radius increases due to the addition of electron shells.

Question 6

A sample of gasoline has a density of $$0.740 \ 	ext{g/mL}. $$What is the mass in kilograms of $$15.0$$ gallons of gasoline? ($$1 \ 	ext{gallon} = 3.785 \ 	ext{L})$$

Accepted Answer

$$42.0 \ 	ext{kg}$$

Question 7

Which of the following compounds is named correctly?

Accepted Answer

FeCl$$_3 is $$iron (III) chloride.

Question 8

Which of the following best explains why nonmetals tend to form anions?

Accepted Answer

Nonmetals have high electronegativity and gain electrons to achieve a stable octet.

Question 9

Which of the following molecules is polar?

Accepted Answer

H$$_2O$$

Question 10

A child weighing $$44.0$$ pounds needs a medication dosed at $$10 \ 	ext{mg/kg}. If $$each tablet contains $$80 \ 	ext{mg}$$, how many tablets should be given? ($$1 \ 	ext{kg} = 2.205 \ 	ext{lbs})$$

Accepted Answer

3

Question 11

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their valence shell.

Question 12

Which of the following is the correct formula for magnesium nitride?

Accepted Answer

Mg$$_3N$_2$$

Question 13

Which of the following pairs of elements would most likely have similar chemical properties?

Accepted Answer

O and S

Question 14

What is the strongest intermolecular force present in CH$$_3F ($$chloromethane)?

Accepted Answer

Dipole-dipole interactions

Question 15

Which of the following statements about electron energy levels is NOT true?

Accepted Answer

The closer an electron is to the nucleus, the higher its energy.

Question 16

Which of the following is NOT a characteristic property of metals?

Accepted Answer

Metals tend to gain electrons when they react.

Question 17

Which of the following best describes the trend in electronegativity as you move down a group in the periodic table?

Accepted Answer

Electronegativity decreases.

Question 18

Which of the following is the correct name for SO$$_3$$?

Accepted Answer

Sulfur trioxide

Question 19

Which of the following best describes the bond between Al (electronegativity 1.5) and O (electronegativity 3.5)?

Accepted Answer

Polar covalent with the partial negative charge on the oxygen.

Question 20

Which of the following elements is an alkali metal?

Accepted Answer

Na

GOB Chemistry Exam Study Guide: Concepts, Formulas, and Step-by-Step Guidance

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