Writing and Balancing Chemical Equations

Question 1

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

Revolt · Accepted Answer

hydrogen + oxygen.

Question 2

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

Revolt · Accepted Answer

magnesium oxide.

Question 3

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

Revolt · Accepted Answer

carbon dioxide + water

Question 4

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

Revolt · Accepted Answer

The products and reactants of both reactions are gases.; A catalyst is used for reaction 2.

Question 5

How do balanced chemical equations show the conservation of mass?

Revolt · Accepted Answer

They show that the number of atoms of each element is the same in the products and reactants.

Question 6

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

Revolt · Accepted Answer

2

Question 7

Which equation obeys the law of conservation of mass?

Revolt · Accepted Answer

2H2(g) + O2(g) → 2H2O(g)

Question 8

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

Revolt · Accepted Answer

1

Question 9

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

Revolt · Accepted Answer

6

Writing and Balancing Chemical Equations Answers

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