AnswersPBCSD_Grade_Forgiveness_2003310_Physical Science_S1_2022Balancing Chemical Equations

Balancing Chemical Equations Answers

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1
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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
2
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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
3

Kiley wants to balance the equation H2 + N2 → NH3. Which would be her first step in balancing an equation?

A
multiplying the subscripts in the atoms of the reactants together
B
adding the coefficient 3 in front of H2 and the coefficient 2 in front of NH3
C
changing the subscripts so they match for the total number of atoms
D
creating a chart that shows the number of atoms in the reactants and products
4

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
5

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?

A
2 in front of water and 2 in front of oxygen
B
1 in front of water and 2 in front of oxygen
C
1 in front of water and 1 in front of oxygen
D
2 in front of water and 1 in front of oxygen
6

Which property of matter is conserved in chemical reactions and shown by balanced equations?

A
mass
B
volume
C
density
D
shape
7

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.
8

Which best describes the law of conservation of mass?

A
The coefficients in front of the chemicals in the reactants should be based on the physical state of the products.
B
Products in the form of gases are not considered a part of the total mass change from reactants to products.
C
When reactants contain both a solid and a liquid, the solid counts toward the overall mass and the liquid does not.
D
The mass of the reactants and products is equal and is not dependent on the physical state of the substances.
9

Lana balanced an equation so that the result was 2C2H3Br + 5O2 → 4CO2 + 2H2O + 2HBr. Which most likely represents the starting equation?

A
2C4H3Br + 5O2 → 4CO2 + 2H2O + 2HBr
B
C2H3Br + 5O2 → 4CO2 + H2O + 2HBr
C
C4H3Br + O2 → CO2 + H2O + HBr
D
C2H3Br + O2 → CO2 + H2O + HBr
10

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

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