Chapter 7
Consider the following reaction
Cu2 + 4I → CuI2
The heat of the reaction is 43 kJ. Which of the following statements is true about this
reaction?
A) The reaction is exothermic and heat is absorbed in this reaction.
B) The reaction is endothermic and heat is absorbed in this reaction.
C) The reaction is exothermic and heat is released by this reaction.
D) The reaction is endothermic and heat is neither released nor absorbed by this reaction.
E) The reaction is endothermic and heat is released by this reaction.
C) The reaction is exothermic and heat is released by this reaction.
What is the pressure (in atm) of 0.063 moles of CH4 gas found in a 900 mL container at a
temperature of -12.00 °C?
A) 2.50 atm
B) 1.2 atm
C) 0.56 atm
D) 0.38 atm
E) 1.5 atm
E) 1.5 atm
If the pressure of a fixed amount of gas in a sealed container is tripled while the volume remains constant, what happens to its temperature?
A) The temperature decreases by a factor of 3.
B) The temperature increases by a factor of 3.
C) The temperature will not change.
D) The temperature increases by a factor of 9.
E) The temperature decreases by a factor of 9.
B) The temperature increases by a factor of 3.
Is this reaction exothermic or endothermic?
(I will show a drawing)
A) exothermic
B) endothermic
A) exothermic
According to the reaction below, how many grams of solid Mg(OH)₂ are formed when 200 mL of 1.50 M aqueous NaOH reacts with excess aqueous MgCl₂?
(Note: Molar Mass of Mg(OH)₂ = 58.319 g/mol)
MgCl2(aq)+2NaOH(aq)→Mg(OH)2(s)+2NaCl(aq)
A) 8.79 g
B) 17.5 g
C) 12.5 g
D) 15.0 g
E) 10.0 g
A) 8.79 g
A quantity of Ne gas that was originally held at 0.667 atm pressure in a 1.50 L container at -80.0 °C is transferred to a 2.50 L container at 200.0 °C. What is the pressure (in atm) of Ne in the new container ?
A) 0.372 atm
B) 3.80 atm
C) 0.980 atm
D) 1.35 atm
E) 5.56 atm
C) 0.980 atm
Which compound below becomes a strong electrolyte when dissolved in water?
A) C12H22O11 (sucrose)
B) SCl6
C) CH3CH2OH
D) KOH
E) Cl2
D) KOH
Reaction A has an activation energy of 24 kJ, Reaction B has an activation energy of 16 kJ, and Reaction c has an activation energy of 36 kJ. Which reaction occurs the fastest?
A) Reaction A
B) Reaction B
C) Reaction C
B) Reaction B
What is the volume (mL) of a 6.00 M NaOH solution that contains 2.40 moles of NaOH?
A) 400 mL
B) 200 mL
C) 150 mL
D) 600 mL
E) 300 mL
A) 400 mL
If the pressure of a constant amount of gas at constant volume is decreased by a factor of 2, what happens to its temperature?
A) The temperature increases by a factor of 2.
B) The temperature will not change.
C) The temperature decreases by a factor of 2.
D) The temperature increases by a factor of 4.
E) The temperature decreases by a factor of 4.
C) The temperature decreases by a factor of 2.
A sports beverage contains 0.75% m/v of calcium. What volume of this beverage must you drink to ingest 500.0 mg of calcium?
A) 66.7 mL
B) 68.2 mL
C) 74.3 mL
D) 76.7 mL
A) 66.7 mL
2) When the reactants in a reaction are being consumed as fast as they are being formed:
A) The reaction is exothermic
B) The reaction rate is very fast
C) The forward and reverse reaction rates are equal
D) The mole amounts are equal for products and reactants
C) The forward and reverse reaction rates are equal