AnswersAA-F26 Physical ScienceUnit Test

Unit Test — Unit test Answers

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Chemical A and Chemical B react in an exothermic reaction. What can be known about what will happen when Chemical A and Chemical B are mixed together?

A
The old substance will need more energy to break its chemical bonds than the new substance will release.
B
More energy will be released from the old substance than the new substance will release to form its chemical bonds.
C
The color will change as a result of the reaction.
D
The substance will bubble as a result of the reaction.
2
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Which property describes a mixture?

A
It cannot be separated by physical methods.
B
It has a single chemical composition.
C
It cannot have more than one state of matter.
D
It cannot be described by a chemical symbol or formula.
3

Which substance is used in lotions and cosmetics?

A
ammonium hydroxide
B
acetic acid
C
formic acid
D
zinc hydroxide
4

Which best describes a mixture?

A
It has a single composition, and it has a set of characteristics that does not change.
B
It can have different compositions, but it has a set of characteristics that does not change.
C
It has a single composition, but it has a set of characteristics that does change.
D
It can have different compositions, and it has a set of characteristics that does change.
5

What ion do acids release in solution?

A
hydrogen
B
hydroxide
C
carbonate
D
ammonium
6

Which symbol in a chemical equation separates the reactants from the products?

A
=
B
→
C
>
D
+
7

A solution has a pH of 2. Which best describes the solution?

A
a strong acid
B
a strong base
C
a neutral solution
D
a weak base
8

Which balances the equation Mg + O2 → MgO?

A
Mg + 2O2 → 4MgO
B
2Mg + 2O2 → 2MgO
C
2Mg + O2 → 2MgO
D
2Mg + 2O2 → 4MgO
9

Harvey mixes two liquids. Which observation of the new mixture most likely indicates a precipitate is forming?

A
a cloudy appearance
B
a bubble formation
C
a change in color
D
a change in odor
10

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

A
2
B
3
C
6
D
9
11

Which best describes solubility?

A
the speed at which a substance dissolves
B
the ability of one substance to dissolve in another
C
the amount of surface area per a given mass
D
the temperature at which subtances become a mixture
12

To make a solution for an experiment, Gunther needs to add 40 g of a solute to 100 g of water. When making the solution at room temperature, he could only add 34 grams before the solute settled out.What could he do to dissolve the remaining 6 grams of the solute?

A
Put the solution in an ice bath, dissolve the solute, and let the solution return to room temperature.
B
Heat the solution, dissolve the solute, and let the solution cool verifying nothing settled out.
C
Add more water, boil the solution, and dissolve the solute until the some of the water evaporates.
D
Keep the solution at room temperature, add more water, and dissolve the excess solute.
13

Which condition must be met in order for an equation to be balanced?

A
The elements in the reactants are the same as the elements in the products.
B
There are fewer elements in the reactants than there are in the products.
C
The number of atoms in the reactants is greater than the number of atoms in the products.
D
The number of atoms in the reactants equals the number of atoms in the products.
14

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
15

Which is a strong base?

A
HCl
B
NaOH
C
NH3
D
H3CO3
16

Which type of reaction has the general formula of AB + CD → AD + CB?

A
synthesis
B
decomposition
C
oxidation
D
replacement
17

Which describes a homogeneous mixture?

A
A solvent dissolves in a solute to make a solution.
B
A solute dissolves in a solvent to make a solution.
C
A solution dissolves in a solute to make a solvent.
D
A solution dissolves in a solvent to make a solute.
18

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
19

Carla is making two drinks. She is making one hot chocolate and one chocolate milk. Which best describes the agitation needed to make sure the cocoa powder is mixed in well?

A
Chocolate milk would require more agitation than hot chocolate does.
B
Hot chocolate would require more agitation than chocolate milk does.
C
They would both require the same agitation.
D
Neither would require any agitation.
20

Which best describes a chemical reaction?

A
the rearrangement of atoms by breaking and reforming chemical bonds
B
a reaction that absorbs heat from the surroundings
C
a reaction that releases heat to the surroundings
D
the rearrangement of molecules based on temperature and pressure

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