Question 1

Which of the following elements is classified as a metalloid on the periodic table?

Accepted Answer

Si (Silicon)

Question 2

A solution contains $$[H_3O^+] = 1.0 	imes 10$$^{-4}$$ M. What is the pH of this solution?

Accepted Answer

$$pH = 4$$

Question 3

Which of the following compounds is insoluble in water according to the solubility rules provided?

Accepted Answer

$$AgCl$$

Question 4

What is the correct IUPAC name for a 4-carbon alkane?

Accepted Answer

Butane

Question 5

If the concentration of $$OH^- in a $$solution is $$1.0 	imes 10$$^{-6}$$ M, what is the pOH?

Accepted Answer

$$pOH = 6$$

Question 6

Which of the following ions will always form a soluble compound in water?

Accepted Answer

$$NO_3$$^-$$ (nitrate)

Question 7

A student mixes $$Na_2SO_4$$ and $$BaCl_2 in $$water. What precipitate, if any, will form?

Accepted Answer

$$BaSO_4$$

Question 8

Which of the following is the correct formula for calculating the concentration of a solution after dilution?

Accepted Answer

$$C_1V_1 = C_2V_2$$

Question 9

Which of the following is the correct prefix for a 5-carbon chain in organic chemistry nomenclature?

Accepted Answer

pent-

Question 10

A solution has a pH of 2. What is the $$[H_3O^+]$$ concentration?

Accepted Answer

$$1.0 	imes 10$$^{-2}$$ M

Question 11

Which of the following is a strong acid according to the reference sheet?

Accepted Answer

$$HCl$$

Question 12

What is the correct formula for the equilibrium constant $$K_w$$ for water?

Accepted Answer

$$K_w = [H_3O^+][OH^-]$$

Question 13

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

Accepted Answer

$$KNO_3$$

Question 14

A solution is prepared by dissolving $$0.1$$ mol of $$NaCl in$$ $$1.0 L of $$water. What is the molarity of the solution?

Accepted Answer

$$0.1 M$$

Question 15

Which of the following is the correct formula for calculating pOH from $$[OH^-]$$?

Accepted Answer

$$pOH = -\log[OH^-]$$

Question 16

Which of the following ions is an exception to the solubility rule for sulfates and forms an insoluble compound?

Accepted Answer

$$Ba^{2+}$$

Question 17

A buffer solution is made by mixing $$CH_3COOH$$ and $$CH_3COONa. $$Which equation best describes the relationship between pH and the concentrations of acid and conjugate base?

Accepted Answer

$$pH = pK_a + \log \frac{[A^-]}{[HA]}$$

Question 18

Which of the following is the correct name for $$CH_3CH_2OH$$?

Accepted Answer

Ethanol

Question 19

A patient’s blood pH is measured at 7.1. Is this considered acidic, basic, or neutral?

Accepted Answer

Acidic

Question 20

Which of the following is the correct formula for the hydroxide ion?

Accepted Answer

$$OH^-$$

Essential Reference Sheet for GOB Chemistry: Periodic Table, Formulas, and Solubility Rules

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