Question 1

Which of the following best describes a molecular equation?

Accepted Answer

An equation that shows the reactants and products as compounds instead of their dissociated ionic forms.

Question 2

Which of the following is a precipitation reaction?

Accepted Answer

$$\mathrm{AgNO}_3 (aq) + \mathrm{NaCl} (aq) \rightarrow \mathrm{AgCl} (s) + \mathrm{NaNO}_3 (aq)$$

Question 3

What is the balanced molecular equation for the reaction between $$\mathrm{Ag}_2\mathrm{SO}_4 (aq) $$and $$\mathrm{KCl} (aq$$)?

Accepted Answer

$$\mathrm{Ag}_2\mathrm{SO}_4 (aq) + 2\mathrm{KCl} (aq) \rightarrow 2\mathrm{AgCl} (s) + \mathrm{K}_2\mathrm{SO}_4 (aq)$$

Question 4

Which step is necessary to determine if a reaction will occur when mixing two aqueous solutions?

Accepted Answer

Consult the solubility rules to determine if a precipitate will form.

Question 5

What is the balanced molecular equation for the neutralization reaction between $$\mathrm{Ca(OH)_2} (aq) $$and $$\mathrm{HCN} (aq$$)?

Accepted Answer

$$\mathrm{Ca(OH)_2} (aq) + 2\mathrm{HCN} (aq) \rightarrow \mathrm{Ca(CN)_2} (aq) + 2\mathrm{H_2O} (l)$$

Question 6

Which of the following best describes a gas evolution reaction?

Accepted Answer

A reaction that forms a gas as one of the products.

Question 7

Given the reaction $$\mathrm{$$MgBr_2$$} (aq) + 2\mathrm{NaOH} (aq) \rightarrow \mathrm{Mg(OH)_2} (s) + 2\mathrm{NaBr} (aq)$$, what type of reaction is this?

Accepted Answer

Precipitation

Question 8

Which of the following is the correct sequence of steps for predicting the products of a molecular equation?

Accepted Answer

Write reactants, swap partners, check solubility, balance equation.

Question 9

A student mixes $$\mathrm{HCl} (aq) $$and $$\mathrm{NaOH} (aq). $$What is the balanced molecular equation for this reaction?

Accepted Answer

$$\mathrm{HCl} (aq) + \mathrm{NaOH} (aq) \rightarrow \mathrm{NaCl} (aq) + \mathrm{H_2O} (l)$$

Question 10

Which of the following is NOT a characteristic of a precipitation reaction?

Accepted Answer

Formation of a gas as a product.

Question 11

If no precipitate, gas, or water forms when two solutions are mixed, what should you conclude?

Accepted Answer

No reaction has occurred.

Question 12

Which of the following is the correct balanced equation for the reaction between $$\mathrm{Ba(NO_3$)_2} (aq) $$and $$\mathrm{Na_2SO_4} (aq$$)?

Accepted Answer

$$\mathrm{Ba(NO_3$)_2} (aq) + \mathrm{Na_2SO_4} (aq) \rightarrow \mathrm{$$BaSO_4$$} (s) + 2\mathrm{$$NaNO_3$$} (aq)$$

Question 13

A solution of $$\mathrm{Na_2CO_3} is $$mixed with $$\mathrm{HCl}. $$Which type of reaction occurs?

Accepted Answer

Gas evolution

Question 14

Which of the following is a correct example of a neutralization reaction?

Accepted Answer

$$\mathrm{H_2SO_4} (aq) + 2\mathrm{KOH} (aq) \rightarrow \mathrm{K_2SO_4} (aq) + 2\mathrm{H_2O} (l)$$

Question 15

Which of the following best explains why $$\mathrm{AgCl}$$ forms as a solid in the reaction $$\mathrm{$$AgNO_3$$} (aq) + \mathrm{NaCl} (aq) \rightarrow \mathrm{AgCl} (s) + \mathrm{$$NaNO_3$$} (aq)$$?

Accepted Answer

$$\mathrm{AgCl} is $$insoluble in water.

Molecular Equations and Predicting Chemical Reactions

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