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energy from chemicals

Total questions: 30

Worksheet time: 45mins

Name
Class
Date
1.
Do reactants in an endothermic reaction have a higher or lower energy than the products? 
a)
Higher
b)
Lower
2.
Do the reactants in an exothermic reaction have a higher or lower energy than the products?
a)
Higher
b)
Lower
3.

What instrument would you use to detect an endothermic or exothermic reaction?

a)

triple beam balance

b)

ruler

c)

thermometer

4.

During an endothermic reaction, heat is ________ and chemical bonds _______.

a)

released, formed

b)

absorbed, broken

c)

released, broken

d)

absorbed, formed

5.

During an exothermic reaction, heat is _________ and chemical bonds __________.

a)

released, formed

b)

absorbed, broken

c)

released, broken

d)

absorbed, formed

6.
When iron nails get rusty, heat is released.  What process is this?
a)
Exothermic
b)
Endothermic
7.

You freeze juice to make ice pops.

a)

exothermic

b)

endothermic

8.

Freezing of ice

a)

Endothermic

b)

Exothermic

9.

Feels cold

a)

Endothermic

b)

Exothermic

10.

Feels warm or hot

a)

Endothermic

b)

Exothermic

11.

Evaporation of sweat

a)

Endothermic

b)

Exothermic

12.

Burning and combustion

a)

Endothermic

b)

Exothermic

13.

Absorbs energy

a)

Endothermic

b)

Exothermic

14.

A melting ice cube is an example of

a)

exothermic

b)

endothermic

c)

none

d)

both

15.

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

a)

It is an exothermic reaction

b)

It is an endothermic reaction

16.

6 CO2+ 6 H2O + Energy  C6H12O6 + 6 O26\ CO_2+\ 6\ H_2O\ +\ Energy\ \rightarrow\ C_6H_{12}O_6\ +\ 6\ O_2

a)

endothermic reaction

b)

exothermic reaction

17.

5. When ammonium chloride dissolves in water the temperature falls. The type of energy change is described as?

a)

A. exothermic    

b)

 B. activated  

c)

C. decomposition            

d)

D. endothermic

18.
Is photosenthysis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
19.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
20.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
21.

6. Which of these processes is always exothermic?

a)

A. evaporation

b)

B. burning

c)

C. insulation

d)

D. melting

22.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
23.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

24.

if less heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants

a)

Endothermic

b)

Exotermic

c)

Exothermic

d)

Entrothermic

25.

if more heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants

a)

Exothermic

b)

Endothermic

c)

Exotermic

d)

Endotermic

26.

What term is given to a reaction which transfers heat energy to the surroundings?

a)

Endothermic

b)

Reversible

c)

Exothermic

d)

Exotermic

27.

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

a)

Endothermic

b)

Decomposition

c)

Exothermic

d)

Indothermic

28.

What type of reaction is this?

a)

Exothermic

b)

Endothermic

c)

Energy Producing

d)

No way to tell

29.

In an endothermic reaction, energy is _________.

a)

absorbed

b)

released

30.

_____ reactions usually feel hot!

a)

endothermic

b)

exothermic