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WorksheetsEndothermic and Exothermic Processes
Total questions: 25
Worksheet time: 25mins
Name
Class
Date
1.
To classify reactions: Consider the object involved in a reaction[the system] and the environment [the surroundings]. An exothermic reaction releases heat into the surroundings; an endothermic reaction takes in heat from the surroundings.
a)
got it
b)
I need practice.
2.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
3.
In an endothermic reaction, heat is ,,,
a)
taken in
b)
given out
4.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
5.
Identify the reaction type when evaporation occurs in a liquid
a)
Endothermic reaction
b)
Exothermic reaction
6.
A liquid evaporates into a gas by ______ heat to the liquid.
a)
adding
b)
giving off
7.
Identify the reaction type when evaporation occurs in a liquid
a)
Endothermic reaction
b)
Exothermic reaction
8.
Condensation and raining are examples of what type of reaction?
a)
Exothermic
b)
Endothermic
9.
Condensation: a gas changing to a liquid
Raining: a gas changing to a liquid
Both are _______ reactions.
Raining: a gas changing to a liquid
Both are _______ reactions.
a)
Exothermic
b)
Endothermic
10.
Condensation: a gas must _____ heat to change to a liquid
Raining: a gas must _____heat to change to a liquid
Raining: a gas must _____heat to change to a liquid
a)
give off
b)
take in
11.
Raining: gas molecules move closer together to form a liquid.
Condensation: gas molecules must move closer together to change to a liquid. The molecules must ____ heat.
Condensation: gas molecules must move closer together to change to a liquid. The molecules must ____ heat.
a)
give off
b)
take in
12.
Condensation and raining are examples of what type of reaction?
a)
Exothermic
b)
Endothermic
13.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
14.
If a chemical reaction is EXOTHERMIC, the temperature of the surroundings would....
a)
Stay the same
b)
Increase
c)
Decrease
15.
When you freeze water, it turns to ice. What process is this?
a)
Exothermic
b)
Endothermic
16.
When iron nails get rusty, heat is released. What process is this?
a)
Exothermic
b)
Endothermic
17.
In an endothermic reaction the system is releasing energy.
a)
True
b)
False
18.
Is the combustion of gasoline endothermic or exothermic?
a)
Endothermic
b)
Exothermic
19.
Do reactants in an endothermic reaction have a higher or lower energy than the products?
a)
Higher
b)
Lower
20.
In an endothermic reaction, reactants take in energy. Would the reactants have a higher or lower energy than the products?
a)
Higher
b)
Lower
21.
In an endothermic reaction, reactants take in energy. Would the reactants have a higher or lower energy than the products?
Reactants → Products
Reactants → Products
a)
Higher
b)
Lower
22.
Do the reactants in an exothermic reaction have a higher or lower energy than the products?
a)
Higher
b)
Lower
23.
Do the reactants in an exothermic reaction have a higher or lower energy than the products?
Reactants → Products
Reactants → Products
a)
Higher
b)
Lower
24.
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
25.
A chemical reaction that requires energy is an
a)
exothermic reaction
b)
endothermic reaction
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