AnswersIA-Chemistry A Survey of Chemistry AUnit Test

Unit Test Answers

16 verified answers
1
Free Preview

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
Free Preview

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 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)
6

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.
7

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

A
The reaction only goes toward the products.
B
The reactant is dissolved in water.
C
A gas and a liquid are produced.
D
A solid precipitate will form.
8

solid sodium + chlorine gas → solid sodium chloride

Answer:

2 solid sodium + chlorine gas → solid sodium chloride

9

solid sodium + liquid water → aqueous sodium hydroxide + hydrogen gas

Answer:

4 solid sodium + liquid water → aqueous sodium hydroxide + hydrogen gas

10

2H2(g) + O2(g) → 2H2O(g)

Answer:

3 2H2(g) + O2(g) → 2H2O(g)

11

2H2O2(aq) → O2(g) + 2H2O(l)

Answer:

1 2H2O2(aq) → O2(g) + 2H2O(l)

12

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.
13

Which equation obeys the law of conservation of mass?

A
H2(g) + O2(g) → H2O(g)
B
H2(g) + O2(g) → H2O(g) +4He(g)
C
2H2(g) + O2(g) → 2H2O(g)
D
H2(g) → H2O(g)
E
H2(g) + O2(g) → 2H2O(g)
14

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
15

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
16

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

Did you find these answers helpful?

More from this Course

Instruction
31 verified answers

Instruction

Assignment
11 verified answers

Assignment

Assignment
9 verified answers

Warm-Up