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Lessons 12.1 & 2 Review
By Kristina Thibodeaux
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Last updated 5 months ago
8 questions
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Question 1
1.
Question 2
2.
Question 3
3.
Question 4
4.
Question 5
5.
Question 6
6.
Question 7
7.
Question 8
8.
What does a positive enthalpy change indicate?
Energy is completely lost.
No energy change.
Endothermic process absorbs heat.
Exothermic process releases heat.
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
How does concentration affect reaction rates?
Concentration affects temperature only
Higher concentration means more collisions
Concentration has no effect
Lower concentration means more collisions
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
Identify the reaction below:
CaO + H
2
O -- Ca(OH)
2
ΔH = - 32.5 kJ
endothermic
exothermic
Identify the reaction below:
2Al + Fe
2
O
3
--> 2Fe + Al
2
O
3
+ heat
endothermic
exothermic
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
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