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WorksheetsU3 L8 Balancing Chemical Equations Practice Quiz
Total questions: 10
Worksheet time: 3hrs 30mins
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.
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
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
Substances A and B react in a ratio of A + B → AB. Colin was combining substance A and substance B to form substance AB. He added 10 g of substance A and 45 g of substance B.
How much of substance AB would Colin make?
10 g
35 g
45 g
55 g
Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the reaction?
The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.
The law of conservation of energy indicates the same amount of carbon will be found in the reactants as in the products.
The law of conservation of mass indicates the same amount of glucose will be found in the reactants as in the products.
The law of conservation of energy indicates the same amount of glucose will be found in the reactants as in the products.
