Question 1

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

NaCl

Question 2

A chemical equilibrium exists when:

Accepted Answer

The rate of the forward reaction equals the rate of the reverse reaction.

Question 3

A gas is transferred from a 3.83 atm pressure in a 1.00 L container at 26.0 $$^\circC to a 10.0 L $$container at 65.0 $$^\circC. $$What is the new pressure, assuming the amount of gas is constant?

Accepted Answer

$$0.536$$ atm

Question 4

Refer to the energy diagram below. Which statement is true regarding the activation energy of the forward reaction?

Accepted Answer

The activation energy of the forward reaction is $$X.$$

Question 5

Which of the following is NOT a property predicted based on the Kinetic Molecular Theory?

Accepted Answer

It explains why the volume of a gas decreases as temperature increases.

Question 6

Chromium metal and oxygen gas react to form chromium(III) oxide according to the following balanced chemical equation:

$$4	ext{Cr}(s) + 3	ext{O}_2(g) ightarrow 2	ext{Cr}_2	ext{O}_3(s)

If 50.0 $$moles of Cr is reacted with 20.0 moles of O$$_2$$, which reactant is the limiting reactant and how many moles of Cr$$_2O$_3$$ form?

Accepted Answer

O$$_2 is $$the limiting reactant forming 13.3 moles of Cr$$_2O$_3$$

Question 7

What volume (mL) of a 10.5 M solution of sodium hydroxide (NaOH) must be diluted to prepare a 200. mL solution of 1.75 M sodium hydroxide?

Accepted Answer

$$33.3 mL$$

Question 8

Based on solubility guidelines, which of the following cations would form a precipitate in water with phosphate (PO$$_4$$^{3-}$$) anion but NOT with chloride (Cl$$^-$$) anion?

Accepted Answer

Fe$$^{3+}$$

Question 9

Potassium nitrate has a solubility of 32 g of KNO$$_3 in 100 g of H$_2O at 20$$ $$^\circC. $$Which of the following statements is true?

Accepted Answer

At 20 $$^\circC$$, 32 g of KNO$$_3$$ dissolved in 100 g of H$$_2O $$will form a saturated solution.

Question 10

What is the pressure (in atm) of 0.133 moles of NH$$_3$$ gas found in a 7.50 L container at a temperature of $$-40.0$$ $$^\circC$$?

Accepted Answer

$$0.263$$ atm

Question 11

If the pressure of a constant amount of gas at constant temperature is increased by threefold, what happens to its volume?

Accepted Answer

The volume decreases by one-third.

Question 12

How many liters of CO$$_2$$ gas are needed to react completely with 56.0 L of CH$$_4 (g) at $$STP to produce CO$$_2 (g) $$and H$$_2O (g$$)?

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

Accepted Answer

$$56.0 L$$

Question 13

What mass of NH$$_3 is $$needed to completely react with 8.00 moles of O$$_2 (g) $$based on the reaction below?

$$4NH_3(g) + 3O_2(g) \rightarrow 2N_2(g) + 6H_2O(g)$$

Accepted Answer

$$10.7$$ moles NH$$_3$$

Question 14

Consider the following reaction:

$$2H_2O_2(aq) \rightarrow 2H_2O(l) + O_2$(g)$$

The heat of the reaction is $$-196 kJ. $$Which of the following statements is true about this reaction?

Accepted Answer

The reaction is exothermic and heat is released by this reaction.

Question 15

A gas mixture contains O$$_2$$ and N$$_2. If O$_2$$ has a partial pressure of 0.74 atm and N$$_2$$ has a partial pressure of 0.88 atm, what is the total pressure of this mixture in atm?

Accepted Answer

$$1.62$$ atm

Question 16

Which of the following aqueous solutions would be expected to have the highest osmotic pressure?

Accepted Answer

1 M CaCl$$_2$$

Question 17

Which pair of compounds will form a solution?

Accepted Answer

C$$_2H$_5OH $$and hexane (C$$_6H$_{14})$$

Question 18

For the reaction $$2H_2S(g) \rightarrow 2H_2(g) + S_2$(g)$$, what is the equilibrium expression?

Accepted Answer

$$K = \dfrac{[H_2$]^2[S_2$]}{[H_2S]^2}$$

Question 19

Based on the concentration plot below, what is the best estimate of the time that equilibrium is established?

Accepted Answer

8 hrs

General Chemistry I: Key Concepts and Problem-Solving Strategies (Sample Exam 3 Study Guide)

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