Question 1

Which of the following statements best describes the reaction shown in the energy diagram provided?

Accepted Answer

The reaction is endothermic because the energy of the products is higher than the energy of the reactants.

Question 2

Which of the following best explains why water is a good solvent for ionic compounds?

Accepted Answer

Water can form hydrogen bonds and is highly polar.

Question 3

A solution contains 21 mg/L of $$\mathrm{Mg$$^{2+}$$}. $$How many equivalents of $$\mathrm{Mg$$^{2+}$$}$$ are present in one liter of blood? (Molar mass of $$\mathrm{Mg$$^{2+}$$} = 24.31 g/$$mol)

Accepted Answer

$$1.7 	imes 10$$^{-3}$$ Eq

Question 4

Which of the following compounds is most likely to be soluble in water?

Accepted Answer

KCl, an ionic compound

Question 5

What is the molarity of a solution that contains 58.5 g of sodium chloride dissolved in $$5.00 	imes 10^2$ mL of solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$2.00 M $$NaCl

Question 6

Which of the following statements about oxidation is correct?

Accepted Answer

Oxidation can be defined as the loss of electrons, the loss of hydrogen, or the gain of oxygen.

Question 7

A blood test shows the level of $$\mathrm{Mg$$^{2+}$$} is 21 mg/L. $$Calculate the number of moles of $$\mathrm{Mg$$^{2+}$$} in $$one liter. (Molar mass of $$\mathrm{Mg$$^{2+}$$} = 24.31 g/$$mol)

Accepted Answer

$$8.6 	imes 10$$^{-4}$$ mol

Question 8

Which of the following best describes a Bronsted-Lowry base?

Accepted Answer

A substance that accepts a proton.

Question 9

What is the pH of a solution with $$[\mathrm{OH^-}] = 2.50 	imes 10$$^{-9}$$ M$$?$$

Accepted Answer

$$5.4$$

Question 10

Which of the following is NOT a property that makes water a good solvent?

Accepted Answer

Its low boiling point

Question 11

Which of the following statements about electrolytes is correct?

Accepted Answer

Some water-soluble compounds are nonelectrolytes.

Question 12

A solution is prepared by mixing 1.4 g of phenol with 9.0 g of glycerin. What is the mass percent of phenol in the solution?

Accepted Answer

13% (m/m)

Question 13

Which of the following best describes osmosis?

Accepted Answer

The movement of solvent molecules through a semipermeable membrane.

Question 14

Which of the following is true about the solubility of $$\mathrm{$$CaSO_4$$} in $$water?

Accepted Answer

$$\mathrm{$$CaSO_4$$} is $$not water soluble.

Question 15

Which of the following changes would increase the rate of the reaction $$2\mathrm{NO}(g) + 2\mathrm{H_2$}(g) \rightarrow \mathrm{N_2$}(g) + 2\mathrm{H_2O}(g)$$?

Accepted Answer

Addition of $$\mathrm{NO}(g)$$

Question 16

Which of the following best describes the difference between strong and weak electrolytes?

Accepted Answer

Strong electrolytes dissociate completely in solution, while weak electrolytes only partially dissociate.

Question 17

Which of the following is the correct balanced equation for the reaction: $$\mathrm{Al} + \mathrm{HBr} \rightarrow \mathrm{$$AlBr_3$$} + \mathrm{H_2$}$$?

Accepted Answer

2, 6, 2, 3

Question 18

Which of the following is true about alkanes with 1–4 carbons?

Accepted Answer

They exist as gases at room temperature.

Question 19

Which of the following is the correct IUPAC name for a molecule with a chlorine atom on carbon 2 and an isopropyl group on carbon 4 of a hexane chain?

Accepted Answer

2-chloro-4-isopropylhexane

Question 20

Which of the following best describes the relationship between constitutional isomers?

Accepted Answer

They have the same molecular formula but different connectivity of atoms.

GOB Chemistry Exam Study Guidance

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