WorksheetsChemical Formulas, Reactions, and Equations
Total questions: 13
Worksheet time: 1hrs 5mins
Name
Class
Date
1.
What is the right part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
2.
Which is NOT an indication of a chemical change?
a)
temperature change
b)
formation of a precipitate
c)
shape change
d)
production of light
3.
The Law of Conservation of Mass proves that -
a)
the number of atoms in a chemical reaction does not change
b)
there are more atoms on the reactant side than the product side
c)
there are more atoms on the product side than the reactant side
d)
the mass of the product will not equal the reactants
4.
You know you a chemical reaction has occurred if
a)
there is a precipitate.
b)
there is a color change.
c)
there is a temperature change.
d)
All of these answers are evidence.
5.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
6.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
the number of atoms
d)
None of the answers are correct
7.
The blue numbers in the image below represent ________
a)
the number of compounds
b)
coefficients
c)
subscripts
d)
none of the answers are correct
8.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
9.
Which is the correct atom count for the reactant side of the chemical equation?
CH4 + 2 O2 -> CO2 + 2 H2O
CH4 + 2 O2 -> CO2 + 2 H2O
a)
C=4
H=4
O=4
H=4
O=4
b)
C=1
H=4
O=2
H=4
O=2
c)
C=1
H=4
O=2
H=4
O=2
d)
C=1
H=4
O=4
H=4
O=4
10.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
11.
How many oxygen atoms are in this chemical formula?
a)
6 oxygen atoms
b)
2 oxygen atoms
c)
3 oxygen atoms
d)
4 oxygen atoms
12.
Is this chemical equation balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
13.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
100 %
