AnswersTX-Integrated Physics and ChemistryUnit Test

Unit Test — Unit test Answers

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1
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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.
2
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What else is produced during the replacement reaction of silver nitrate and potassium sulfate?2AgNO3 + K2SO4 Ag2SO4 + ________

Question illustration
A
KNO3
B
2KNO3
C
K2
D
2AgNO3
3

The activation energy of a reaction going on its own is 20 kJ. If the reaction was treated with a catalyst, which would most likely represent the amount of energy needed to start a reaction?

A
15 kJ
B
20 kJ
C
25 kJ
D
30 kJ
4

The Statue of Liberty is made out of copper and was once shiny and copper-colored. Over the years, the copper has gone through a process called oxidation, where it has changed into a new material.

A
an endothermic reaction
B
an energy formation
C
a chemical reaction
D
a precipitate formation
5

The release of a gas from a chemical reaction is very quick. A scientist wants to measure what is released, but in small increments. What would allow the scientist to change the rate of the reaction so the results could be measured?

A
an enzyme
B
an inhibitor
C
a depressant
D
an accelerator
6

Lexi is balancing equations. She is finding one equation to be very difficult to balance. Which explains how to balance the equation ZnSO4 + Li2CO3 → ZnCO3 + Li2SO4?

A
One reactant and one product needs the coefficient 2.
B
The products both need a 3 coefficient.
C
The reactants both need a 2 coefficient.
D
Atoms in the equation are already in balance.
7

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.
8

In which reaction would the activation energy result in an endothermic reaction?

A
water freezing
B
an egg cooking
C
a candle burning
D
iron rusting
9

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

A
synthesis
B
decomposition
C
oxidation
D
replacement
10

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
11

What must occur in order for a chemical reaction to be specifically classified as endothermic instead of exothermic?

A
Atoms are rearranged.
B
Chemical bonds are formed.
C
Energy is released in the form of heat.
D
Energy is absorbed in the form of heat.
12

Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?

A
The fireworks produce colors.
B
The fireworks give off heat.
C
Igniting the fireworks requires energy.
D
Igniting the fireworks makes an odor.
13

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.
14

The chart shows the path reactants take to become products.

Question illustration
A
Heat was removed from the activation energy to create the product.
B
Heat was added to create the product.
C
The products have less energy than the reactants.
D
The products have the same energy as the reactants.
15

The equations are not balanced. Which equation would have the same coefficients in the same order as 2CO2 + 3H20 C2H6O + 3O2?

Question illustration
A
FeCl3 + NH4OH Fe(OH)3 + NH4Cl
Option A
B
CH4 + O2 CO2 + H2O
Option B
C
Fe + H2SO4 Fe2(SO4)3 + H2
Option C
D
PCl5 + H2O HCl + H3PO4
Option D
16

Enzymes are added to a chemical reaction to lower the activation energy. What is an enzyme classified as?

A
a catalyst
B
an inhibitor
C
an accelerator
D
a depressant
17

When liquid silver nitrate and liquid sodium chloride are combined, solid silver chloride forms along with a new liquid, sodium nitrate. Which substance represents the precipitate?

A
silver nitrate
B
silver chloride
C
sodium chloride
D
sodium nitrate
18

synthesispolymerizationdecompositionoxidationreplacement

A
synthesis
B
polymerization
C
decomposition
D
oxidation
E
replacement
19

Which is produced in a synthesis reaction?

A
a single element
B
a single compound
C
a single ion
D
a single atom
21

Which clue can be used to identify a chemical reaction as a replacement reaction?

A
The reaction has two reactants with ions that seem to switch places.
B
The reaction has a single reactant that changes into two or more products.
C
The reaction involves oxygen reacting with a hydrocarbon and giving off heat.
D
The reaction involves a single product forming from two or more reactants.

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