Unit Test

Question 1

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

Revolt · Accepted Answer

A: hydrogen + oxygen.

Question 2

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

Revolt · Accepted Answer

C: The formulas of the reactants are C3H8 and O2. The formulas of the products are CO2 and H2O.

Question 3

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

Revolt · Accepted Answer

B: C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)

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

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

Question 5

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

Revolt · Accepted Answer

B: The reactant is dissolved in water.; C: A gas and a liquid are produced.

Question 6

How do balanced chemical equations show the conservation of mass?

Revolt · Accepted Answer

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

Question 7

Which equation obeys the law of conservation of mass?

Revolt · Accepted Answer

C: 2H2(g) + O2(g) → 2H2O(g)

Question 8

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

Revolt · Accepted Answer

B: 2

Question 9

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

A: 1

Question 10

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

B: magnesium oxide.

Unit Test Answers

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