NEW
Font size
WorksheetsBalancing Chemical Equations Practice
Total questions: 15
Worksheet time: 15mins
Which statement best describes balancing equations and the law of conservation of mass?
There are more atoms in the reactants than in the products, and the total mass is the same in the reactants and in the products.
The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.
There are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the products.
There are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in the products.
Robert is balancing equations with his study group. He is unsure about one equation because each member of the study group came up with a different answer. Which is the proper way to balance the equation Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O?
H3PO4 → Ca3(PO4)2 + H2O?
Ca(OH)2 + H3PO4 → Ca3(PO4)2 + 6H2O
3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 3H2O
Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
Charlie is balancing an equation. She has identified the atoms and counted the number of each in the reactants and products. What would Charlie adjust to make the number of atoms in the reactants the same as the number of atoms in the products?
coefficients
subscripts
superscripts
parentheses
One half of a balanced chemical equation is shown.
3Mg(OH)2 + 2H3PO4
Which lists the numbers of each atom the other half of the equation would contain?
3 Mg, 2 P, 14 O, 12 H
Mg, 2 P, 14 O, 6 H
3 Mg, 8 P, 7 O, 6 H
6 Mg, 6 P, 2 O, 12 H
The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H2O) and O2 gas. Which coefficients would be placed in front of water and oxygen?
2 in front of water and 2 in front of oxygen
1 in front of water and 2 in front of oxygen
1 in front of water and 1 in front of oxygen
2 in front of water and 1 in front of oxygen
Which is the balanced equation for V2O5 + CaS → CaO + V2S5?
V2O5 + CaS → CaO + V2S5
5V2O5 + 5CaS → 10CaO + 5V2S5
3V2O5 + 3CaS → 3CaO + 3V2S5
V2O5 + 5CaS → 5CaO + V2S5
The equation for water is H2 +O2 → H2O. To balance the equation, which coefficient should be placed in front of H2 and H2O?
1
2
3
4
When balanced, which equation would have the coefficient 3 in front of any of the reactants?
Zn + HCl --> ZnCl2 + H2
H2SO4 + B(OH)3 --> B2(SO4)3 + H2O
Fe + AgNO3 --> Fe(NO3)2 + Ag
C2H4O2 + O2 --> CO2 +H2O
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
yes
no
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
4Fe + 3O2 -> 2Fe2O3
2 Fe + 3O2 -> Fe2O6
4 Fe + O6 -> 2Fe2O3
None of the options are correctly balanced.
Determine the balanced equation for each of the following:
H2 + O2 --> H2O
H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
H2 + O2 --> H2O2
H2 + 2O2 --> 2H2O
Determine the balanced equation for each of the following:
F2 + KCl --> KF + Cl2
F2 + KCl --> KF + Cl2
F2 + KCl2 --> KF2 + Cl2
F2 + 2KCl --> 2KF + Cl2
F2 + 2KCl --> KF + Cl2
Which of the following chemical equations is balanced?
@@ ext{C}_3 ext{H}_8 + 5 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@
@@ ext{C}_3 ext{H}_8 + 4 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@
@@ ext{C}_3 ext{H}_8 + 6 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@
@@ ext{C}_3 ext{H}_8 + 5 ext{O}_2 ightarrow 4 ext{CO}_2 + 4 ext{H}_2 ext{O}@@
In a chemical reaction, the equation @@ ext{N}_2 + 3 ext{H}_2 ightarrow 2 ext{NH}_3 isbalanced.Whatdoesthecoefficient′3′infrontof ext{H}_2@@ indicate?
3 molecules of hydrogen gas are needed
3 atoms of hydrogen are needed
3 moles of hydrogen gas are needed
3 grams of hydrogen gas are needed
When balancing the chemical equation @@ ext{Al}_2 ext{O}_3 + ext{Fe} ightarrow ext{Fe}_3 ext{O}_4 + ext{Al} ,whatisthecorrectcoefficientfor ext{Fe}@@?
3
4
9
6
