AnswersIA-Chemistry A Survey of Chemistry AWriting and Balancing Chemical Equations

Writing and Balancing Chemical Equations Answers

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1
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Electrolysis breaks down water to form hydrogen and oxygen gas. The word equation that represents this reaction is: water

Question illustration
A
hydrogen + oxygen.
B
water + gas.
C
water.
2
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A bright light is produced when magnesium reacts with the oxygen in air to form magnesium oxide. The word equation that represents this reaction is: magnesium + oxygen

Question illustration
A
magnesium.
B
magnesium oxide.
C
oxygen.
3

When methane burns, it reacts with oxygen to produce water and carbon dioxide. The word equation that represents this reaction is: methane + oxygen

Question illustration
A
hydrogen + carbon
B
gas + liquid
C
carbon dioxide + water
4

Propane burns in oxygen to produce carbon dioxide and water. What are the chemical formulas of the reactants and products?

A
The formulas of the reactants are C3H8, O, and CO2. The formula of the product is H2O.
B
The formulas of the reactants are C3H8 and O2. The formulas of the products are CO and H2O.
C
The formulas of the reactants are C3H8 and O2. The formulas of the products are CO2 and H2O.
5

What do the symbols tell you about the conditions of the reactions shown to the right? Check all of the boxes that apply.

A
The products and reactants of both reactions are gases.
B
Reaction 1 occurs at high pressure.
C
Reaction 2 makes a small amount of an additional product.
D
A catalyst is used for reaction 2.
6

How do balanced chemical equations show the conservation of mass?

A
They show that the atoms in the products may be different than the reactants as long as the mass does not change.
B
They show that the atoms in the products are the same as in the reactants, but the number of atoms must change.
C
They show that the number of atoms of each element is the same in the products and reactants.
7

In level 1, you balanced the equation N2 + H2 → NH3. What number did you place in front of ammonia (NH3)?

A
1
B
2
C
3
D
4
8

What is the chemical equation for the burning of propane if all the products and reactants are in the gas phase?

A
4H2O(g) + 3CO2(g) + 5O2(g) → C3H8(g)
B
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
C
C3H8(g) + O10(g) → 3CO2(g) + 4H2O(l)
D
4H2O(l) + 3CO2(g) → C3H8(g) + 5O2(g)
9

In level 2, you balanced the equation C + H2O → CH4 + CO2. What number did you place in front of carbon dioxide (CO2)?

A
1
B
2
C
3
D
4
10

In level 3, you balanced the equation NH3 + O2 → NO2 + H2O. What number did you place in front of water?

A
2
B
4
C
5
D
6

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Writing and Balancing Chemical Equations Answers…