Question 1

Which of the following statements best describes the difference between a double displacement reaction and a single displacement reaction?

Accepted Answer

A double displacement reaction depends on solubility rules, while a single displacement reaction depends on the activity series and redox reactions.

Question 2

Which of the following compounds is expected to be soluble in water?

Accepted Answer

Sodium carbonate ($$\mathrm{Na_2CO_3})$$

Question 3

A student mixes aqueous solutions of silver nitrate ($$\mathrm{$$AgNO_3$$}) $$and sodium phosphate ($$\mathrm{Na_3PO_4}). $$What is the expected observation?

Accepted Answer

A precipitate of silver phosphate ($$\mathrm{Ag_3PO_4}) $$forms.

Question 4

Which of the following best describes the purpose of assigning oxidation numbers in chemical reactions?

Accepted Answer

To identify if a reaction involves electron transfer (redox).

Question 5

What is the oxidation number of oxygen in hydrogen peroxide ($$\mathrm{H_2O_2}$$)?

Accepted Answer

$$-1$$

Question 6

Which of the following metals will displace copper from a solution of copper(II) sulfate ($$\mathrm{$$CuSO_4$$}$$)? Use the activity series.

Accepted Answer

Zinc ($$\mathrm{Zn})$$

Question 7

A student is asked to calculate the energy required to heat $$100\ \mathrm{g} of $$water from $$25^\circ\mathrm{C} to$$ $$75^\circ\mathrm{C}. $$The specific heat capacity of water is $$4.18\ \mathrm{J/g\cdot K}. $$Which equation should be used?

Accepted Answer

$$q = m \cdot c \cdot \Delta T$$

Question 8

Which of the following statements about the First Law of Thermodynamics is correct?

Accepted Answer

The total energy of an isolated system remains constant; energy can change forms but is neither created nor destroyed.

Question 9

In a redox reaction, which of the following statements is true?

Accepted Answer

Oxidation is the loss of electrons and reduction is the gain of electrons.

Question 10

A $$50.0\ \mathrm{mL}$$ sample of $$0.200\ \mathrm{M}$$ HCl is titrated with $$0.100\ \mathrm{M}$$ NaOH. What volume of NaOH is required to reach the equivalence point? (Use $$M_1V_1 = M_2V_2)$$

Accepted Answer

$$100.0\ \mathrm{mL}$$

Question 11

Which of the following best explains why Group 1 carbonates (e.g., $$\mathrm{Na_2CO_3}) $$are soluble in water, while most other carbonates are not?

Accepted Answer

Group 1 ions are highly hydrated and disrupt the lattice, increasing solubility.

Question 12

Which of the following is the correct formula for calculating the translational kinetic energy of a particle?

Accepted Answer

$$E_k = \frac{1}{2}mv^2$

Question 13

A reaction produces a gas when hydrochloric acid is added to a sample. Which type of reaction is this most likely to be?

Accepted Answer

Single displacement (redox) reaction

Question 14

Which of the following statements about the solubility of phosphates is correct?

Accepted Answer

Most phosphates are insoluble, except those of Group 1 elements and ammonium.

Question 15

Which of the following is the correct equation for the First Law of Thermodynamics?

Accepted Answer

$$\Delta E = q + w$$

Question 16

If a metal is more active than another, what will happen when it is placed in a solution containing ions of the less active metal?

Accepted Answer

The more active metal will displace the less active metal from solution.

Question 17

Which of the following is true regarding the oxidation numbers of elements in their elemental form?

Accepted Answer

They have an oxidation number of $$0.$$

Question 18

A gas expands against a constant external pressure of $$2.00\ \mathrm{atm}$$ from $$5.00\ \mathrm{L} to$$ $$10.00\ \mathrm{L}. $$What is the work done by the gas in Joules? ($$1\ \mathrm{L\cdot atm} = 101.3\ \mathrm{J})$$

Accepted Answer

$$-1013\ \mathrm{J}$$

Question 19

Which of the following best explains why assigning oxidation numbers is important in redox reactions?

Accepted Answer

It allows identification of which species are oxidized and reduced.

Thermodynamics, Energy Concepts, and Chemical Reactions: General Chemistry Study Guide

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