WorksheetsChemistry Crush (8th Grade)
Total questions: 10
Worksheet time: 18mins
Name
Class
Date
1.
Balance this equation
Ca + H2O --> CaO + H2
Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
It is already balanced
d)
Cannot be balanced
2.
Predict the products (right side) of this reaction reaction,
Ca + 2HCl --> ?
Ca + 2HCl --> ?
a)
4CaCl3 + H2
b)
no reaction
c)
CaH2 + Cl
d)
CaCl2 + H2
3.
Balance this equation-
__P4 + __O2 --> __P2O3
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
4.
Which chemical equation best illustrates the law of conservation of mass?
a)
2Al+CuO -> Al2O3 +3Cu
b)
2Al+3CuO -> Al2O3 +Cu
c)
2Al + 3CuO -> Al2O3 + 3Cu
d)
3Al + 2CuO -> Al2O3 + 2Cu
5.
Which of the following contains one oxygen atom?
a)
H2O
b)
CO2
c)
2N2O
d)
Co
6.
A scientist carries out a reaction in a test tube. After the bubbling stops, she notices that the test tube is very warm. What might she conclude about the reaction?
a)
The reaction happened very quickly.
b)
The reaction is endothermic.
c)
The reaction is exothermic.
d)
No reaction took place.
7.
A substance that is used to speed up a chemical reaction is called
a)
a reactant.
b)
an inhibitor.
c)
a precipitate.
d)
a catalyst.
8.
Is the combustion of gasoline endothermic or exothermic?
a)
Endothermic
b)
Exothermic
9.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
10.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
100 %
