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WorksheetsC2.5 Energy from Chemical Reactions
Total questions: 13
Worksheet time: 9mins
Name
Class
Date
1.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
2.
In an endothermic reaction, heat is ,,,
a)
taken in
b)
given out
3.
Ist the following an endothermic or an exothermic process?
E + BaS --> Ba2+ + S2-
E + BaS --> Ba2+ + S2-
a)
Endothermic
b)
Exothermic
4.
A certain chemical reaction requires 286 kJ of energy to react and produces 300 kJ of energy. What is ΔH and is the reaction endothermic or exothermic?
a)
14 kJ/kg
Endothermic
Endothermic
b)
14 kJ/kg Exothermic
c)
-14 kJ/kg Endothermic
d)
-14 kJ/kg Exothermic
5.
Is the melting of ice an exothermic or endothermic process?
a)
Exothermic
b)
Endothermic
6.
What kind of reaction is shown in the picture
a)
Endothermic
b)
Exothermic
c)
Explosive
d)
Boring
7.
The energy needed to start a chemical reaction is the _____________________.
a)
Activation Energy
b)
Products
c)
Reactants
d)
Enzymes
8.
_______________ can speed up the rate of reactions and/or lower the amount of energy needed for
the reaction to take place.
the reaction to take place.
a)
Carbohydrates
b)
Fuel source
c)
Chemical
d)
Catalyst
9.
Enzymes work by lowering the _______________________ for chemical reactions.
a)
Products
b)
Solutes
c)
Activation Energy
d)
Reactants
10.
___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.
reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
11.
Chemical reactions that release energy are known as ________________________.
a)
Endothermic
b)
Exothermic
c)
Boring
d)
Reactions
12.
Once a reaction reaches equilibrium the reaction stops taking place.
a)
TRUE
b)
FALSE
13.
All chemical reactions are reversible
a)
TRUE
b)
FALSE
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