AnswersPA-Science 8 Q1Lab: Rate of Chemical Reactions

Lab: Rate of Chemical Reactions — Unit test Answers

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A
synthesis
B
polymerization
C
decomposition
D
oxidation
E
replacement
2
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The first chart shows the effect of the normal breakdown of material from reactants to products. The second chart shows the same reaction but with an added modification.

Question illustration
A
Reaction A has an enzyme.
B
Reaction B has an enzyme.
C
Reaction A has an inhibitor.
D
Reaction B has an inhibitor.
3

What is produced during the replacement reaction of Cu(NO3)2 and Zn?

A
ZnNO3 + Cu
B
Zn + Cu(NO3)2
C
ZnCu + 2NO3
D
Zn(NO3)2 + Cu
4

Which statement summarizes the difference between mass and weight?

A
Mass is the downward pull on an object due to gravity, and weight is the amount of matter in an object.
B
Mass is the amount of matter in an object, and weight is the downward pull on an object due to gravity.
C
Mass is measured in newtons, and weight is measured in pounds.
D
Mass is measured in pounds, and weight is measured in newtons.
5

Which best describes what is made of matter?

A
all living things and objects
B
all atoms
C
all solid objects and atoms
D
all living things
6

Uranium is a type of atom. In special circumstances that usually involve high amounts of energy, uranium can be broken. When this occurs, different pieces of the original atom remain, including a substance called plutonium.Which statement most likely describes plutonium?

A
It will still be uranium, just smaller pieces of uranium.
B
It must no longer be a form of matter.
C
It must be a different kind of atom.
D
It will be different than, but have the same properties as, uranium.
7

If a chemical reaction does not reach its activation energy, which will most likely occur?

A
The chemical bonds will remain unchanged.
B
The chemical bonds will break.
C
The chemical bonds will have high kinetic energy.
D
The chemical bonds will already be broken.
8

Shiloh wanted to observe the changes that occurred during an exothermic reaction. He monitored the changes and placed them in a chart. Which statement best describes his data?

Question illustration
A
The activation energy was reached at 10:45 a.m. Without the additional energy, the reaction would have stopped.
B
The activation energy was reached at 11:15 a.m. The previous change was the threshold point for a reaction.
C
The activation energy was reached at 10:15 a.m. The additional energy allowed for a lower activity level.
D
The activation energy was reached was 10:45 a.m. The additional energy did not affect the reaction.
9

Why is matter so diverse in its properties and characteristics?

A
Different combinations of various atoms result in a wide range of matter.
B
When atoms are split, new matter will be created.
C
Matter consists of various atoms that are chemically identical.
D
The size of atoms in matter depends on their temperature.
10

What else is produced during the replacement reaction of magnesium and hydrochloric acid?Mg + 2HCl H2 + ________

Question illustration
A
MgCl2
B
Mg2Cl2
C
Mg2Cl
D
MgCl
11

Which type of reaction is Mg + S → MgS?

A
polymerization
B
synthesis
C
replacement
D
decomposition
12

Mora measures the speed of the particles in a solid mass. She wants to speed up the action. Which action will allow her to do so?

A
adding more mass
B
breaking it apart
C
using an inhibitor
D
lowering the activation energy

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