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CRM 3.1-2

Total questions: 19

Worksheet time: 28mins

Name
Class
Date
1.

Marissa blows up balloons for a party. She decides how big or small to make each balloon. Why does the air she blows into each balloon take up all the space inside the balloon?

a)

The particles of air move around and slide past one another and take the shape of the balloon.

b)

The particles of air move freely, colliding with each other and the sides of the balloon.

c)

The particles of air move and increase in size when they have more space in the balloon.

d)

The particles of air have a strong attraction between each other and the balloon.

2.

Which model represents the attractive forces in a liquid?

a)

Model 3 represents a liquid because the particles are hardly affected by the attractive forces.

b)

Model 2 represents a liquid because the attractive forces keep the particles vibrating in place.

c)

Model 1 represents a liquid because the particles are locked in their positions because of the attractive forces.

d)

Model 2 represents a liquid because the attractive forces keep the particles close together but still allow movement

3.
At room temperature, aluminum is a solid and water is a liquid. How do the particles of solid aluminum compare to the particles of liquid water?
a)
The attractions between the particles are weaker in the solid aluminum.
b)
The attractions between the particles are stronger in the solid aluminum.
c)
There is no attraction between particles in the solid aluminum.
d)
The particles are moving more freely in the solid aluminum.
4.
Raul and Bonnie are trying to classify several objects that they found during a field trip to the beach. They collected a sample of seawater, a piece of driftwood, and several smooth pebbles. How are the particles that make up the driftwood different than those of the pebbles and the seawater?
a)
The particles vibrate, but stay fixed tightly together
b)
The particles do not vibrate and they stay fixed tightly together.
c)
The particles vibrate and frequently collide, but stay close together
d)
The particles vibrate and frequently collide, but move freely in all directions.
5.
Which statement below best describes the movement of particles in a gas?
a)
The particles do not move.
b)
The particles move freely.
c)
The particles vibrate in a fixed position.
d)
The particles slide easily past one another.
6.
Why does liquid water take the shape of the cup it is poured in to, but solid ice cubes do not?
a)
Because the particles of liquid water are softer than particles of solid ice.
b)
Because the particles of liquid water are smaller than the particles of solid ice.
c)
Because the particles of liquid water are moving but the particles of solid ice are not.
d)
Because the particles of liquid water can easily move past one another but the particles of solid ice cannot.
7.
Why is the formation of rust considered a chemical change?
a)
Rust is more reactive than oxygen
b)
Rust has the same chemical composition as iron.
c)
Rust has a lower density than iron.
d)
Rust has properties that are different from iron and oxygen.
8.

Amanda investigated physical and chemical changes in science class and then classified her changes into two columns shown. Column A are the chemical changes and Column B are the physical changes. Which statement below best explains why the processes in Column A are chemical changes?

a)

The change has formed new substances

b)

The shape of the substance has changed.

c)

The change that occurred can be reversed easily.

d)

The characteristics of the original substance have not changed.

9.
Which process is an example of a physical change?
a)
A peanut butter sandwich is eaten and broken down by enzymes in the stomach.
b)
Sodium metal and water are combined to form a basic compound and a flammable gas.
c)
Carrots are cut into small pieces and mixed into a salad.
d)
Sodium metal and chlorine gas are combined to form sodium chloride, or table salt
10.
Lena is making a cake to share with her family. She combines the ingredients for the cake, then pours the batter into two pans and bakes the cake for 45 minutes in the oven. What type of change is baking a cake?
a)
Baking a cake is a physical change, because it can be reversed.
b)
Baking a cake is a chemical change, because you combine chemicals.
c)
Baking a cake is a chemical change, because it becomes a different substance.
d)
Baking a cake is a physical change, because the ingredients are the same they are just combined together.
11.
Ethan is observing chemical and physical properties of a substance. He heats a substance and observes that the substance turns from a brown solid to a black powder. He refers to several chemistry journals that claim this represents a chemical reaction. From his observation and research, he concludes that the substance goes through a chemical change when heated. How can Ethan best defend his conclusion?
a)
By verifying that the substance is made up of only one type of element.
b)
By demonstrating that the substance has the same density after it is heated.
c)
By verifying that the substance is now made up of different molecules than before it was heated.
d)
By demonstrating that the substance will eventually melt if the temperature continues to increase.
12.
Alison finds the total mass of a sample of baking soda, a balloon, and a glass container with vinegar in it. She adds the baking soda to the vinegar and immediately places the balloon over the mouth of the container. After the reaction is complete, she again finds the total mass of the system. Which statement is true about this investigation?
a)
The mass changes because there was a chemical change that occurred.
b)
Mass is lost during the reaction because a chemical change is taking place.
c)
Mass is gained during the reaction because a chemical change is taking place.
d)
The mass does not change because chemical changes observes the law of conservation of mass.
13.
When paper is burned, the mass of the remaining ash is less than the mass of the original paper. Which statement best explains this result?
a)
Some of the matter is destroyed during the reaction.
b)
The volume of the ash is less than the volume of the paper.
c)
The mass of the ash cannot be accurately determined.
d)
Some of the matter changed to a gas and was released to the air.
14.

Andrea makes a sugar solution, as shown below. How much sugar did she dissolve in the water? How much sugar did she dissolve in the water?

a)

9 g

b)

11 g

c)

13 g

d)

17 g

15.
Allen mixes fertilizer for his plants at the beginning of the week. He puts 40 g of the fertilizer-water solution in each of seven closed containers and uses one container each day to water his plant. One day, he goes outside to get a container and finds that the solution in it is frozen. How much mass should the frozen solution in the container have?
a)
0 g
b)
10 g
c)
20 g
d)
40 g
16.
Mrs. Winston decides to do a demonstration for her class with a piece of chalk. Using a balance, Mrs. Winston discovers that the mass of the chalk is 20 g. She then takes the piece of chalk and crushes into a fine powder. The cumulative mass of the fine powder is 20 g. What has Mrs. Winston demonstrated for her class?
a)
a chemical change involving change of shape and size of matter
b)
a chemical change involving change of mass
c)
a physical change involving change of shape and size of matter
d)
a physical change involving change of mass
17.
Which statement best explains how temperature affects the rate of reaction for a chemical change.
a)
As the temperature decreases, the rate of reaction increases.
b)
As the temperature increases, the rate of reaction increases.
c)
As the temperature increases, the rate of reaction stays the same.
d)
As the temperature decreases, the rate of reaction stays the same
18.

Ashley has two samples of water at different temperatures shown. She drops an Alka-seltzer tablet into each sample of water at the same time and starts a timer to measure the rate of reaction. Which statement below best describes what Ashley should expect to find from her investigation?

a)

Sample A will have a greater rate of reaction than Sample B, because the temperature in Sample A is lower.

b)

Sample B will have a greater rate of reaction than Sample A, because the temperature in Sample B is lower.

c)

Sample A will have a greater rate of reaction than Sample B, because the temperature in Sample A is greater.

d)

Sample B will have a greater rate of reaction than Sample A, because the temperature in Sample B is greater.

19.
Hannah wants to make some toast for breakfast, but she has 3 minutes before she has to leave for school. She knows toasting bread is a chemical change so what is the best way for Hannah to increase the rate of this chemical change?
a)
change the type of bread she uses.
b)
change the size of bread she uses.
c)
increase the temperature of the toaster oven.
d)
decrease the temperature of the toaster oven.

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