 Balancing Equations
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• Question 1
60 seconds
Q. Balance this equation:
MgCl2 --> Mg4+ Cl2
4MgCl2 --> Mg4+ 4Cl2
4MgCl2 --> Mg4+ 5Cl2
• Question 2
60 seconds
Q. Balance this equation:
2Li + Cl2 -> LiCl
2Li + Cl2 -> 4LiCl2
2Li + Cl2 -> LiCl2
2Li + Cl2 -> 2LiCl
• Question 3
60 seconds
Q. The substances listed on the left side of a chemical equation are the
Products
Coefficients
Precipitates
Reactants
• Question 4
60 seconds
Q. In chemical reactions, what does the principle of conservation of mass mean?
Matter is not created or destroyed.
The total mass of the reactants is greater than the total mass of the products.
The total mass of the reactants is less than the total mass of the products.
Matter is not changed.
• Question 5
60 seconds
Q. How many Hydrogen (H) atoms are in NH3O5
3
4
5
1
• Question 6
60 seconds
Q. Name the part in red:

H2 + O2 -> H2O
Coefficient
Product
Yield
Subscript
• Question 7
60 seconds
Q. Name the part in red:

_2_H+ _1_O2 -> _2_H2O
Coefficient
Product
Yield
Subscript
• Question 8
60 seconds
Q. Name the part in red:

H+ O2 -> H2O
Coefficient
Product
Reactant
Subscript
• Question 9
60 seconds
Q. Name the part in red:

H+ O-> H2O
Coefficient
Product
Reactant
Subscript
• Question 10
120 seconds
Q. How many phosphorus atoms are in PO4?
1
2
3
4
• Question 11
120 seconds
Q. Which number should go in the blank?
_ H2 + O2 -> 2 H2O
1
2
3
0
• Question 12
120 seconds
Q. Is the following equation balanced or unbalanced ?
Al + O2 --> Al2O3
Balanced
Unbalanced
• Question 13
120 seconds
Q. Is the following equation balanced or unbalanced ?
N2 +3 H2 --> 2NH3
Balanced
Unbalanced
• Question 14
60 seconds
Q. How many hydrogens are in 4H2O?
6
8
2
4
• Question 15
60 seconds
Q. Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
12
6
4
• Question 16
60 seconds
Q. How many atoms of aluminum are on each side of the following equation: 4Al + 3O--> 2AlO3
2
6
1
4
• Question 17
120 seconds
Q. What are the coefficient used to balance the equation below?
__Ag2O →__ Ag +___O2
2,4,1
1,1,1
2,1,2
2,2,2
• Question 18
60 seconds
Q. How many Oxygen atoms are in 4H2O?
4
1
0
8
• Question 19
120 seconds
Q.  Balance this equation:

__ Al + __ HCl → __ H
2 + __ AlCl3
2, 6, 3, 2