WorksheetsChemical equation balancing
Total questions: 20
Worksheet time: 11mins
What is the left part of a chemical equation called?
2H2 + O2 ---> 2H2O
Yields
Products
Chemical equation
Reactants
What is the right part of a chemical equation called?
2H2 + O2 ---> 2H2O
Reactants
Yields
Products
Chemical Equation
How many Mn atoms are found in the following compound?
2MnO4
2
4
6
8
What is the little number after an element in a chemical equation called?
Example: H2
Coefficient
Atom
Subscript
Equation
What is the number before a chemical formula called?
Example: 2H2 + O2 ---> 2H2O
Coefficient
Atom
Subscript
Equation
Which of the following equations are correctly balanced?
CO2 + H2O ---> 3C6H12O6 + O2
12CO2 + H2O ---> C6H12O6 + O2
6CO2 + 6H2O ---> C6H12O6 + 6O2
CO2 + 9H2O ---> C6H12O6 + O2
Balance this equation:
H2 + Cl2 ---> HCl
H2 + Cl2 ---> 2HCl
H2 + 3Cl2 ---> 6HCl
3H2 + Cl2 ---> 6HCl
It is balanced.
Q.
Complete the sentence.
During a chemical reaction, atoms ________.
can disappear
can appear
stop moving and vibrating
get rearranged
What is a coefficient?
The small number on the right of the chemical symbol.
The large number in front of a chemical formula.
The number in between the chemical symbols.
The number behind a chemical formula.
What is the Law of Conservation of Mass?
It states that atom cannot be created or destroyed.
It states that energy cannot be created or destroyed.
It states that atom can be created or destroyed.
It states that sound can be created or destroyed.
What are the numbers that you CANNOT change in a chemical equation?
Coefficient
Products
Reactants
Subscripts
Balance the following equation:
___ H2+ ___ O2→___ H2O
1, 1, 3
2, 2, 2
1, 2, 1
2, 1, 2
What is the right ratio of chemicals for the balanced chemical equation?
__Na + __H2O --> __NaOH + __H2
4,4 --> 4,1
1,2 --> 2,4
1,2 --> 2,1
2,2 --> 2,1
What is the right ratio of chemicals for the balanced chemical equation?
__Ca + __H2O --> __Ca(OH)2 + __H2
2,1 --> 2,1
1,2 --> 1,1
1,2 --> 2,4
1,2 --> 2,1
What is the right ratio of chemicals for the balanced chemical equation?
__CO + __Fe2O3--> __Fe + __CO2
3,2 --> 1,1
3,2 --> 2,4
3,1 --> 2,3
3,2 --> 2,1
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?
__CH4 + __O2 --> __CO2+ __H2O
1,2 --> 2,1
1,2 --> 1,1
1,2 --> 1,2
2,1 --> 2,1
What is the right ratio of chemicals for the balanced chemical equation?
__AgNO3 + __H2S --> __Ag2S+ __HNO3
2,1 --> 1,2
1,2 --> 1,1
1,2 --> 1,2
1,2 --> 2,1
What is the right ratio of chemicals for the balanced chemical equation?
__H2SO3 + __KOH--> __H2O+ __K2SO3
2,1 --> 2,1
1,2 --> 1,1
1,2 --> 1,2
1,2 --> 2,1
What is the right ratio of chemicals for the balanced chemical equation?
__FeCl3 + __Ca(OH)2 --> __Fe(OH)3 + __CaCl2
4,3--> 2,1
3,2 --> 3,1
2,3 --> 2,2
2,3 --> 2,3
What is the right ratio of chemicals for the balanced chemical equation?
__MnO2 + __HCl --> __MnCl2 + __H2O __Cl2
4,1 --> 2,1,2
1,2 --> 1,1,4
1,4 --> 1,2,1
1,4 --> 2,2,1
