NEW
Font size
S
M
L
XL
WorksheetsCHEMICAL REACTIONS & EQUATIONS
Total questions: 10
Worksheet time: 7mins
Name
Class
Date
1.
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
a)
(a) 1:1
b)
(b) 2:1
c)
(c) 4:1
d)
(d) 1:2
2.
Copper chloride and aluminum react to produce aluminum chloride and copper. Which of the following is the correctly balanced chemical equation for this reaction?
a)
CuCl2 + Al -> AlCl3 + Cu
b)
3CuCl2 + Al -> AlCl3 + 2Cu
c)
3CuCl2 + 2Al -> 2AlCl3 + 3Cu
d)
CuCl2 + 3Al -> AlCl3 + 2Cu
3.
Which observation would most likely indicate that an exothermic reaction has occurred?
a)
a color change
b)
the production of gas bubbles
c)
an increase in temperature
d)
a decrease in temperature
4.
Suppose two substances were combined together in a beaker. You know that a chemical reaction occurred if:
a)
new substances were created.
b)
one substance dissolved in the other.
c)
one substance melted in the other.
d)
the two substances remained separate.
5.
The law of conservation of matter states that:
a)
matter is neither created nor destroyed.
b)
the mass of the products is always greater than the mass of the reactants.
c)
the mass of the products is always less than the mass of the reactants.
d)
matter is always converted into an equal amount of energy.
6.
Suppose the mass of two reactants totals 10 grams. After the chemical reaction, what should be the total mass of the products?
a)
0 grams
b)
5 grams
c)
10 grams
d)
20 grams
7.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
8.
What is the little number after an element in a chemical equation called.
Example: H2
Example: H2
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
9.
How many aluminum atoms are in Al2(SO4)3?
a)
1
b)
2
c)
3
d)
4
10.
What is the colour of ferrous sulphate heptahydrate salt ?
a)
blue
b)
white
c)
green
d)
red
Reset
