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Lessons 12.1 & 2 Review
By Kristina Thibodeaux
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Last updated 2 months ago
8 questions
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Question 1
1.
What does a positive enthalpy change indicate?
Energy is completely lost.
No energy change.
Endothermic process absorbs heat.
Exothermic process releases heat.
Question 2
2.
What factor increases the rate of a reaction significantly?
Increased temperature of reactants
Raising the activation energy
Decreasing concentration of reactants
Reducing surface area of solids
Question 3
3.
How does concentration affect reaction rates?
Concentration affects temperature only
Higher concentration means more collisions
Concentration has no effect
Lower concentration means more collisions
Question 4
4.
What is the effect of a catalyst?
It slows down the reaction greatly
It decreases the activation energy
It changes the products formed
It increases activation energy needed
Question 5
5.
Identify the reaction below:
CaO + H
2
O -- Ca(OH)
2
ΔH = - 32.5 kJ
endothermic
exothermic
Question 6
6.
Identify the reaction below:
2Al + Fe
2
O
3
--> 2Fe + Al
2
O
3
+ heat
endothermic
exothermic
Question 7
7.
Which reaction will have the fastest rate of reaction?
strip of magnesium in 20C
strip of magnesium in 80C
magnesium powder in 20C
magnesium powder in 80C
Question 8
8.
To increase the rate of a reaction you must
increase the frequency of the collisions
decrease the frequency of the collisions
change the location of the collisions
decrease the speed of the collisions