Q: Which compound is INCORRECTLY named?

Na_2SO_4\ \text{sodium sulfite}

Question 1

Determine the percent carbon by mass in the acetate ion $\mathrm{CH_3COO^-}$. (Atomic masses: C = 12.01, H = 1.01, O = 16.00)

Accepted Answer

59.3\ \%

Question 2

Which compound is INCORRECTLY named?

Accepted Answer

Na_2SO_4\ 	ext{sodium sulfite}

Question 3

Determine the molecular mass of iron(II) bromide, $\mathrm{FeBr_2}$, a substance used as a catalyst in organic reactions. (Fe = 55.85, Br = 79.90)

Accepted Answer

215.65\ 	ext{amu}

Question 4

How many moles of sodium ions are in 100\ \mathrm{mL} of 0.1\ \mathrm{M}$\ \mathrm{Na_3PO_4}$ (a strong electrolyte)?

Accepted Answer

0.03\ 	ext{mol}

Question 5

The distance between carbon atoms in ethylene is 134 picometers. Which of the following expresses that distance in meters?

Accepted Answer

1.34 	imes 10^{-12}\ 	ext{m}

Question 6

A laboratory technician needs to prepare 250\ \mathrm{mL} of 0.2\ \mathrm{M}$\ \mathrm{K_2Cr_2O_7}$ solution. How many grams of $\mathrm{K_2Cr_2O_7}$ (molar mass = 294.18\ \mathrm{g/mol}) are required?

Accepted Answer

14.71\ 	ext{g}

Question 7

Which of the following best describes why $\mathrm{Na_3PO_4}$ is considered a strong electrolyte?

Accepted Answer

It completely dissociates into ions in aqueous solution.

Question 8

A student mixes 0.1\ \mathrm{mol}$\ \mathrm{Ba(OH)_2}$ with excess $\mathrm{H_2SO_4}$. What is the maximum number of moles of water that can be formed? (Balanced equation: $\mathrm{Ba(OH)_2 + H_2SO_4 \rightarrow BaSO_4 + 2H_2O}$)

Accepted Answer

0.2\ 	ext{mol}

Question 9

Which of the following ions is present in the highest concentration in a 0.1\ \mathrm{M}$\ \mathrm{NH_4NO_3}$ solution?

Accepted Answer

Both $\mathrm{NH_4^+}$ and $\mathrm{NO_3^-}$ at 0.1\ \mathrm{M}

Question 10

A sample contains 0.5\ \mathrm{mol}$\ \mathrm{Fe(OH)_3}$. How many grams of iron are present? (Fe = 55.85, O = 16.00, H = 1.01)

Accepted Answer

27.93\ 	ext{g}

Question 11

Which of the following best explains why $\mathrm{Ba(OH)_2}$ is classified as a strong base?

Accepted Answer

It completely dissociates in water to produce $\mathrm{OH^-}$ ions.

Question 12

If 0.2\ \mathrm{mol}$\ \mathrm{Na_2SO_4}$ is dissolved in water, how many moles of sulfate ions are present?

Accepted Answer

0.2\ 	ext{mol}

Question 13

Which of the following is the correct formula for potassium dichromate?

Accepted Answer

$\mathrm{K_2Cr_2O_7}$

Question 14

A solution contains 0.05\ \mathrm{mol}$\ \mathrm{NH_4NO_3}$ in 500\ \mathrm{mL}$. What is the molarity of the solution?

Accepted Answer

0.1\ 	ext{M}

Question 15

Which of the following best describes the oxidation state of iron in $\mathrm{Fe(OH)_3}$?

Accepted Answer

+3

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