Question 1

Which of the following best describes the role of baking soda (NaHCO$$_3) in $$baking, as shown in the first image with muffins rising in the oven?

Accepted Answer

It reacts with acids to produce CO$$_2$$ gas, causing the dough to rise.

Question 2

Given the unbalanced equation: CH$$_4(g) + O$_2(g$$) $$\rightarrow CO$_2(g) + H$_2O(g$$), what is the correct balanced equation?

Accepted Answer

$$\mathrm{CH_4(g) + 2\ O_2(g) \rightarrow CO_2(g) + 2\ H_2O(g)}$$

Question 3

Which of the following statements about solubility rules is correct?

Accepted Answer

All nitrates (NO$$_3^-) $$are soluble in water.

Question 4

A student mixes aqueous solutions of AgNO$$_3$$ and NaCl. What is the net ionic equation for the reaction that occurs?

Accepted Answer

$$\mathrm{Ag^+(aq) + Cl^-(aq) \rightarrow AgCl(s)}$$

Question 5

Which of the following best explains why NaCl conducts electricity in water but sugar (C$$_{12}H$_{22}O$_{11}) $$does not?

Accepted Answer

NaCl forms ions in water, while sugar does not dissociate into ions.

Question 6

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

Accepted Answer

$$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$$

Question 7

A solution is prepared by dissolving 58.44 g of NaCl in enough water to make 1.00 L of solution. What is the molarity of the solution?

Accepted Answer

$$1.00\ \mathrm{M}$$

Question 8

Which of the following reactions is an example of an oxidation-reduction (redox) reaction?

Accepted Answer

$$\mathrm{2\ Mg(s) + O_2(g) \rightarrow 2\ MgO(s)}$$

Question 9

If 42.5 g of Mg reacts with 33.8 g of O$$_2$$ according to the equation 2 Mg(s) + O$$_2(g$$) $$\rightarrow 2 $$MgO(s), what is the theoretical yield of MgO in grams?

Accepted Answer

$$70.5\ \mathrm{g}$$

Question 10

A student mixes 0.150 L of 0.175 M Pb(NO$$_3$$)$$_2$$ with KCl(aq) according to the equation: 2 KCl(aq) + Pb(NO$$_3$$)$$_2(aq$$) $$\rightarrow$$ PbCl$$_2(s) + 2 $$KNO$$_3(aq). $$What volume of 0.150 M KCl is required to completely react with the Pb(NO$$_3$$)$$_2$$?

Accepted Answer

$$0.350\ \mathrm{L}$$

Question 11

Which of the following best describes the limiting reactant in a chemical reaction?

Accepted Answer

The reactant that determines the maximum amount of product formed.

Question 12

What is the percent yield if the theoretical yield of MgO is 70.5 g but only 55.9 g is actually obtained?

Accepted Answer

$$79.3\%$$

Question 13

Which of the following is a weak electrolyte in aqueous solution?

Accepted Answer

CH$$_3$$COOH (acetic acid)

Question 14

Which of the following is the correct oxidation state for sulfur in SO$$_4$$^{2-}$$?

Accepted Answer

$$+6$$

Question 15

Which of the following best describes the process of dissolving NaCl in water?

Accepted Answer

NaCl dissociates into Na$$^+$$ and Cl$$^-$$ ions, which are stabilized by interactions with water molecules.

Question 16

Which of the following is a correct statement about acids and bases according to the Arrhenius definition?

Accepted Answer

Acids produce H$$^+$$ ions in aqueous solution, and bases produce OH$$^-$$ ions.

Question 17

Which of the following is the correct balanced equation for the combustion of propane (C$$_3H$_8$$)?

Accepted Answer

$$\mathrm{C_3H_8(g) + 5\ O_2(g) \rightarrow 3\ CO_2(g) + 4\ H_2O(l)}$$

Question 18

Which of the following is the correct formula for calculating molarity (M)?

Accepted Answer

$$M = \frac{n}{V}$$

Question 19

Which of the following is a polyprotic acid?

Accepted Answer

H$$_2SO$_4$$

Chemical Reactions and Stoichiometry: Study Notes for General Chemistry

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