Q: Which of the following is the correct net ionic equation for the reaction between NaOH(aq) and CuSO$$_4(aq$$)?

$$2\text{OH}^-(aq) + \text{Cu}^{2+}(aq) \rightarrow \text{Cu(OH)}_2(s)$$

Q: If 26.2 g of K$$_2O$_2$$ reacts with water to produce O$$_2$$ gas, how many grams of O$$_2$$ are produced? (Molar mass K$$_2O$_2 = 71.1 g/$$mol, O$$_2 = 32.0 g/$$mol)

$$26.2 \text{ g} \div 71.1 \text{ g/mol} \times 3 \text{ mol O}_2 \div 4 \text{ mol K}_2O_2 \times 32.0 \text{ g/mol} = 8.8 \text{ g}$$

Question 1

Which of the following ions is NOT a strong electrolyte in aqueous solution?

Accepted Answer

None of these

Question 2

Which of the following is a strong base?

Accepted Answer

Ca(OH)$$_2$$

Question 3

What is true about the reaction: CH$$_3$$COOH(aq) $$\rightarrow CH$_3$$COO$$^- (aq) + H$^+(aq$$)?

Accepted Answer

It represents the dissociation of a weak acid

Question 4

Na$$_3PO$_4 is ______ $$and AgCl is ______.

Accepted Answer

soluble, insoluble

Question 5

An electrolyte is a substance that:

Accepted Answer

conducts electricity when dissolved in water

Question 6

How many grams does 5.71 moles of nickel contain? (Atomic mass of Ni = 58.69 g/mol)

Accepted Answer

$$5.71 	imes 58.69 = 335 g$$

Question 7

A compound with a molar mass of 78.1 g/mol is made only of carbon and hydrogen. When 2.311 g of CO$$_2$$ and 0.4729 g of H$$_2O $$are produced from combustion of a sample, what is the molecular formula?

Accepted Answer

C$$_6H$_6$$

Question 8

How many grams of NO$$_2$$ are produced when 4.30 g of HNO$$_3 is $$used in the reaction: $$3	ext{NO}_3(aq) + 2	ext{HNO}_3(aq) ightarrow 2	ext{HNO}_2(aq) + 	ext{NO}_2(aq)$$?

Accepted Answer

4.7 g

Question 9

Which of the following best describes the solubility of AgCl in water?

Accepted Answer

AgCl is insoluble in water

Question 10

Which of the following is the correct net ionic equation for the reaction between NaOH(aq) and CuSO$$_4(aq$$)?

Accepted Answer

$$2	ext{OH}^-(aq) + 	ext{Cu}^{2+}(aq) ightarrow 	ext{Cu(OH)}_2(s)$$

Question 11

What is the balanced chemical equation for the neutralization reaction between phosphoric acid (H$$_3PO$_4) $$and potassium hydroxide (KOH)?

Accepted Answer

$$H_3PO_4(aq) + 3KOH(aq) \rightarrow K_3PO_4(aq) + 3H_2O(l)$$

Question 12

Which of the following is a weak acid?

Accepted Answer

CH$$_3$$COOH

Question 13

Which of the following statements about electrolytes is correct?

Accepted Answer

Electrolytes conduct electricity in aqueous solution

Question 14

A student mixes Na$$_3PO$_4$$ and AgNO$$_3 in $$water. What precipitate forms?

Accepted Answer

Ag$$_3PO$_4$$

Question 15

Which of the following is the correct ionic equation for the reaction between NaOH(aq) and CuSO$$_4(aq$$)?

Accepted Answer

$$2Na^+(aq) + 2OH^-(aq) + Cu$$^{2+}$$(aq) + SO_4$^{2-}(aq) \rightarrow Cu(OH)_2(s) + 2Na^+(aq) + SO_4$^{2-}(aq)$$

Question 16

If 26.2 g of K$$_2O$_2$$ reacts with water to produce O$$_2$$ gas, how many grams of O$$_2$$ are produced? (Molar mass K$$_2O$_2 = 71.1 g/$$mol, O$$_2 = 32.0 g/$$mol)

Accepted Answer

$$26.2 	ext{ g} \div 71.1 	ext{ g/mol} 	imes 3 	ext{ mol O}_2 \div 4 	ext{ mol K}_2O_2 	imes 32.0 	ext{ g/mol} = 8.8 	ext{ g}$$

Question 17

Which of the following is the empirical formula for a compound that produces 2.311 g CO$$_2$$ and 0.4729 g H$$_2O $$upon combustion?

Accepted Answer

CH

Question 18

Which of the following is a product of the reaction between phosphoric acid and potassium hydroxide?

Accepted Answer

K$$_3PO$_4$$

Question 19

Which of the following is a strong acid?

Accepted Answer

HCl

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