1. What is the correct definition of an exothermic reaction?
A. Chemical reaction that releases energy in the form of heat
B. The study of changes in heat in a chemical reaction
C. Has a positive value for q
2. Reactants Products + 43kJ
Is this reaction endothermic or exothermic?
A. Endothermic
B. Exothermic
3. Choose all of the qualities that apply to an endothermic reaction.
A. +q
B. heat flows out
C. feels cold
D. feels hot
E. heat flows in
F. product is higher than reactant
G. product is lower than reactant
4. If a chemist measures two samples and discovers that they have the same temperature, what can be defined about the two samples? Answer.
5. What does a negative heat of reaction mean?
A. exothermic
B. endothermic
6. A piece of silver weighs 15.2g and has a specific heat of 0.233 J/g°C. If the piece is cooled down from 100°C, to 25°C, how much heat is released from the silver?
7. Convert 0.213 Joules to calories
8. A 385g cup is filled with hot liquid. The liquid transfers 7032 J of energy to the cup. How much energy did the cup gain? How much energy did the cup lose? If the temperature of the cup increases by 22 C, what is the specific heat of the cup?
A. Chemical reaction that releases energy in the form of heat
B. The study of changes in heat in a chemical reaction
C. Has a positive value for q
2. Reactants Products + 43kJ
Is this reaction endothermic or exothermic?
A. Endothermic
B. Exothermic
3. Choose all of the qualities that apply to an endothermic reaction.
A. +q
B. heat flows out
C. feels cold
D. feels hot
E. heat flows in
F. product is higher than reactant
G. product is lower than reactant
4. If a chemist measures two samples and discovers that they have the same temperature, what can be defined about the two samples? Answer.
5. What does a negative heat of reaction mean?
A. exothermic
B. endothermic
6. A piece of silver weighs 15.2g and has a specific heat of 0.233 J/g°C. If the piece is cooled down from 100°C, to 25°C, how much heat is released from the silver?
7. Convert 0.213 Joules to calories
8. A 385g cup is filled with hot liquid. The liquid transfers 7032 J of energy to the cup. How much energy did the cup gain? How much energy did the cup lose? If the temperature of the cup increases by 22 C, what is the specific heat of the cup?
Answers:
1: A,
2: B,
3: A|C|E|F,
4: The two substances have the same kinetic energy.
5:exothermic
6: -
7. .051 cal
8. .8 cal/goC
1: A,
2: B,
3: A|C|E|F,
4: The two substances have the same kinetic energy.
5:exothermic
6: -
7. .051 cal
8. .8 cal/goC