AnswersAL-Physical Science A- TAPUnit Test

Unit Test — Unit test Answers

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1
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What does the octet rule state that explains why atoms bond?

A
An atom bonds to have eight valence electrons to become stable.
B
An atom bonds to lose eight valence electrons to become stable.
C
An atom bonds to have eight valence electrons to become unstable.
D
An atom bonds to lose eight valence electrons to become unstable.
2
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Which clue can be used to identify a chemical reaction as a decomposition reaction?

A
The reaction involves oxygen.
B
The reaction involves ions.
C
The reaction has a single reactant.
D
The reaction has a single product.
3

What are the products of the combustion of a hydrocarbon?

A
carbon and oxygen
B
carbon dioxide and water
C
carbon and hydrogen
D
carbon dioxide and hydrogen
4

Thirty grams of lead oxide and fifteen grams of ammonia react completely to produce solid lead, nitrogen gas, and liquid water. What will be approximate mass of all three products?

A
10 g
B
15 g
C
45 g
D
450 g
5

Hydrochloric acid and sodium hydroxide can be combined to form sodium chloride and water. Which best explains the reaction?

A
The mass of sodium hydroxide will result in the same mass of sodium chloride.
B
The total mass of hydrochloric acid and sodium hydroxide will result in a lower total mass of sodium chloride and water.
C
The mass of hydrochloric acid will result in the same mass of sodium chloride.
D
The total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water.
6

Sal drew the electron dot diagram of an aluminum atom as shown.

Question illustration
A
He should add five more dots so that the atom obeys the octet rule.
B
He should add ten more dots so that all thirteen electrons are shown.
C
He should add a single dot below the symbol.
D
He should add one dot below and one dot to the left of the symbol.
7

Which is a characteristic of all ions?

A
They are metals.
B
They have a charge.
C
They are made of two or more types of atoms.
D
They form chemical bonds through electron sharing.
8

Which are the products in the equation CH3SH + 4O2 → CO2 + SO2 +2H2O? Check all that apply.

A
CH3SH
B
O2
C
CO2
D
SO2
E
H2O
9

Which balances the equation Mg + O2 → MgO?

A
Mg + 2O2 → 4MgO
B
2Mg + 2O2 → 2MgO
C
2Mg + O2 → 2MgO
D
2Mg + 2O2 → 4MgO
10

To what extent do covalent compounds conduct electricity?

A
always
B
usually
C
rarely
D
never
11

Which is most likely a covalent compound?

A
LiF
B
MgS
C
NH3
D
CaCl2
12

Which ionic compound is used as a building material?

A
salt
B
limestone
C
magnesium oxide
D
iron oxide
13

How many chlorine atoms are on the products side of the reaction 2Al + 6HCl → 2AlCl3 + 3H2?

A
2
B
3
C
6
D
9

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