WorksheetsChemical Formula and Chemical Equation
Total questions: 25
Worksheet time: 3600secs
Name
Class
Date
1.
CaCO3 represents a
a)
Symbol
b)
Formula
c)
Subscript
d)
Coefficient
2.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
3.
Balance this equation...
HgO --> Hg + O2
HgO --> Hg + O2
a)
It is balanced
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
4.
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
5.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
6.
How many oxygen atoms are in the following compound 2Al2(CO3)3
a)
1
b)
3
c)
6
d)
18
7.
Element or compound?
H2O
H2O
a)
element
b)
compound
8.
What do we call a chemical substance made up of 2 or more different types atoms bonded together?
a)
formula
b)
atom
c)
subscript
d)
compound
9.
The red numbers in the image below represent ________
a)
symbol
b)
coefficients
c)
subscripts
d)
equation
10.
Which of the following is NOT an element?
a)
H2O
b)
H2
c)
O2
d)
Au
11.
Which is the correct formula for the compound Chromium (II) Nitrate?
a)
Cr2NO3
b)
(Cr)2NO3
c)
CrNO2
d)
Cr(NO3)2
12.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
13.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO
N2+O2--> _NO
a)
1
b)
2
c)
3
d)
4
14.
Which of the following is an unbalanced equation?
(Check ALL answers)
(Check ALL answers)
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
15.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
16.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
17.
Balance this equation-
_SeCl6+_O2 ->_SeO2+_Cl2
_SeCl6+_O2 ->_SeO2+_Cl2
a)
1,2,1,2
b)
1,1,1,3
c)
1,2,1,1
d)
2,1,1,1
18.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
19.
Which equation is balanced?
a)
SO2 + 2H2--> H2SO4
b)
SO2 + H2O --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
d)
2Na + 2H2O --> 2NaOH + H
20.
What is the chemical formula of Magnesium chloride?
a)
MgCl
b)
MgCl2
c)
MgC
d)
MgC2
21.
What is the chemical formula of sodium sulfate?
a)
SSO4
b)
SoSO4
c)
NaSO4
d)
Na2SO4
22.
What is the name of this chemical, H2SO4?
a)
Hydrogen sulfate
b)
Sulfuric acid
c)
Sulfate
d)
Sulfate hydrogen
23.
What is the formula of Copper (II) oxide?
a)
CUO
b)
CuO
c)
CuO2
d)
Cu2O
24.
What is the formula of nitric acid?
a)
H2SO4
b)
HNO3
c)
HCl
d)
hno3
25.
Which of the following compound is not an acid?
a)
HCl
b)
H2SO4
c)
HNO3
d)
CH4
100 %
