Question 1

Which of the following is NOT an observable evidence of a chemical reaction?

Accepted Answer

Change in mass

Question 2

According to the Law of Conservation of Mass, what must be true for a balanced chemical equation?

Accepted Answer

The total mass of reactants equals the total mass of products

Question 3

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

Accepted Answer

BaSO4

Question 4

What is the correct balanced equation for the reaction: Na3PO4 (aq) + Ca(NO3)2 (aq) → NaNO3 (aq) + Ca3(PO4)2 (aq)?

Accepted Answer

$$2\ Na_3PO_4\ (aq)\ +\ 3\ Ca(NO_3$)_2\ (aq)\ \rightarrow\ 6\ $$NaNO_3$$\ (aq)\ +\ 1\ Ca_3$(PO_4$)_2\ (aq)$$

Question 5

A student mixes 25.0 g of hydrogen gas with 12.0 g of oxygen gas. According to the Law of Conservation of Mass, how many grams of water vapor will form?

Accepted Answer

37.0 g

Question 6

Which of the following is a precipitation reaction?

Accepted Answer

ZnBr2 (aq) + 2 KOH (aq) → Zn(OH)2 (s) + 2 KBr (aq)

Question 7

How many ions will the following soluble compound produce: Na2SO4?

Accepted Answer

3

Question 8

Which pair of compounds is insoluble in water?

Accepted Answer

PbSO4 and Pb3(PO4)2

Question 9

What is the net ionic equation for the reaction between Copper(II) Bromide and Lithium Hydroxide?

Accepted Answer

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

Question 10

Which element is being reduced in the following reaction: $$Cr_2O_7$$^{2-}$$\ +\ 3\ $$HNO_2$$\ +\ 5\ H^+\ \rightarrow\ 2\ Cr$$^{3+}$$\ +\ 3\ NO_3$^-\ +\ 4\ H_2O$$?

Accepted Answer

Chromium

Question 11

In the reaction $$2\ Li\ (s)\ +\ Zn$$^{2+}$$\ (aq)\ \rightarrow\ 2\ Li^+\ (aq)\ +\ Zn\ (s)$$, which reactant is undergoing oxidation?

Accepted Answer

Lithium

Question 12

Which of the following represents an oxidation-reduction reaction?

Accepted Answer

I and II

Question 13

What is the oxidation number of carbon in the acetate ion $$C_2H_3O_2^-$$?

Accepted Answer

Question 14

Which compound has oxygen with the lowest oxidation state?

Accepted Answer

O2

Question 15

When balancing a chemical equation, what must be equal on both sides of the arrow?

Accepted Answer

The number and type of atoms

Question 16

Which of the following elements would have the lowest oxidation number?

Accepted Answer

Argon, Ar

Question 17

What is the first step in balancing a redox reaction in an acidic solution?

Accepted Answer

Break the full redox reaction into 2 half reactions

Question 18

In basic redox reactions, what additional step is required compared to acidic redox reactions?

Accepted Answer

Add $$OH^- to $$both sides to neutralize $$H^+$$

Question 19

Which of the following is a correct net ionic equation for a precipitation reaction?

Accepted Answer

$$Ba^{2+}$$\ (aq)\ +\ $$SO_4$$^{2-}\ (aq)\ \rightarrow\ $$BaSO_4$$\ (s)$$

Classification and Balancing of Chemical Reactions (GOB Chemistry Ch.5 Study Guide)

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