AnswersGCSS_Physical Science_ICBalancing Chemical Equations

Balancing Chemical Equations Answers

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If the mass of the products measured 120 g, what would be the mass of the reactants?

A
30 g
B
60 g
C
120 g
D
240 g
2
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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.

A
10 g
B
35 g
C
45 g
D
55 g
3

Which is the balanced equation for V2O5 + CaS → CaO + V2S5?

A
V2O5 + CaS → CaO + V2S5
B
5V2O5 + 5CaS → 10CaO + 5V2S5
C
3V2O5 + 3CaS → 3CaO + 3V2S5
D
V2O5 + 5CaS → 5CaO + V2S5
4

The equations are not balanced. Which equation would have the same coefficients in the same order as 2CO2 + 3H20 C2H6O + 3O2?

Question illustration
A
FeCl3 + NH4OH Fe(OH)3 + NH4Cl
Option A
B
CH4 + O2 CO2 + H2O
Option B
C
Fe + H2SO4 Fe2(SO4)3 + H2
Option C
D
PCl5 + H2O HCl + H3PO4
Option D
5

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?

A
coefficients
B
subscripts
C
superscripts
D
parentheses
6

Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the reaction?

A
The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.
B
The law of conservation of energy indicates the same amount of carbon will be found in the reactants as in the products.
C
The law of conservation of mass indicates the same amount of glucose will be found in the reactants as in the products.
D
The law of conservation of energy indicates the same amount of glucose will be found in the reactants as in the products.
7

Akia is balancing the equation Na + H2O NaOH + H2. He tries to find the coefficients that will balance the equation.How could he find the correct coefficients?

Question illustration
A
by counting each individual atom and making sure the number of each kind of atom is the same in the reactants and the products
B
by counting the total atoms and making sure the number of atoms in the reactants is the same as the number of atoms in the products
C
by counting the total mass of each compound and making sure the reactants have more mass than the products
D
by counting the mass of each atom and making sure the reactants are more massive than the products
8

One half of a balanced chemical equation is shown.3Mg(OH)2 + 2H3PO4Which lists the numbers of each atom the other half of the equation would contain?

A
3 Mg, 2 P, 14 O, 12 H
B
Mg, 2 P, 14 O, 6 H
C
3 Mg, 8 P, 7 O, 6 H
D
6 Mg, 6 P, 2 O, 12 H
9

The equation below shows a general equation for a reaction, and the amounts of the substance are written underneath. AB + CD → AC + BD(15 g) (?) (?) (10 g)The total mass of the products is 50g. Which best completes the other two amounts?

A
The amount of CD is 40 g, and the amount of AC is 35 g.
B
The amount of CD is 35 g, and the amount of AC is 40 g.
C
The amount of CD and AC would be the same.
D
The amount of CD and AC is undetermined.
10

Which equation is balanced?

A
Mg3N2 + H2O 3MgO + 2NH3
Option A
B
C3H8 + 5O2 H2O + 3CO2
Option B
C
Zn + 2HCl ZnCl2 + H2
Option C
D
3H2SO4 + 2Fe Fe2(SO4)3 + H2
Option D

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