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- 1. Multiple Choice
Given the balanced equation: I2(s) + energy → I2(g)
As a sample of I2(s) sublimes to I2(g), the entropy of the sample
1. increases because the particles are less randomly arranged
2. increases because the particles are more randomly arranged
3. decreases because the particles are less randomly arranged
4. decreases because the particles are more randomly arranged
- 2. Multiple Choice
Which of these changes produces the greatest increase in entropy?
1. CaCO3(s) → CaO(s) + CO2(g)
2. 2 Mg(s) + O2(g) → 2 MgO(s)
3. H2O(g) → H2O(l)
4. CO2(g) → CO2(s)
- 3. Multiple Choice
A thermometer is in a beaker of water. Which statement best explains why the thermometer reading initially increases when LiBr(s) is dissolved in the water?
The entropy of the LiBr(aq) is greater than the entropy of the water.
The entropy of the LiBr(aq) is less than the entropy of the water.
The dissolving of the LiBr(s) in water is an endothermic process.
The dissolving of the LiBr(s) in water is an exothermic process.
- 4. Multiple Choice
Which one of the following is NOT a key concept of the collision theory:
particles must collide in order to react
particles must move slowly when they collide, otherwise they simply “bounce off” one another
particles must collide with the proper orientation
particles must collide with sufficient energy to reach the activated complex in order to react
- 5. Multiple Choice
Which one of the following factors does not affect the rate of a chemical reaction:
humidity
temperature
concentration
- 6. Multiple Choice
The rate of a chemical reaction normally
increases as temperature decreases
decreases when a catalyst is added
increases as reactant concentration increases
decreases as reactant concentration increases
- 7. Multiple Choice
This reaction is reversible because a gas is generated and the reaction produced an increase in temperature
This reaction is spontaneous because a gas is generated and the reaction produced an increase in temperature
This reaction will not occur in real life because because a gas is generated and the reaction produced an increase in temperature.
- 8. Multiple Choice
Which statement is true regarding this chemical equation:
CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)
One gram of methane is required to react with 2 grams of oxygen gas
One gram of methane is required to react with 4 grams of oxygen gas.
One mole of methane is required to react with 4 moles of oxygen gas.
One mole of methane is required to react with 2 moles of oxygen gas.
- 9. Multiple Choice
When the chemical equation below is balanced, what will be the coefficient for NH3 ?
NH3(g) + O2(g) --> N2(g) + H2O(g)
4
3
2
6
- 10. Multiple Choice
Given the potential energy diagram for a chemical reaction:Which statement correctly describes the energy changes that occur in the forward reaction?
The activation energy is 10. kJ and the reaction is
endothermic.
The activation energy is 10. kJ and the reaction is
exothermic.
The activation energy is 50. kJ and the reaction is
endothermic.
The activation energy is 50. kJ and the reaction is
exothermic.
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