Quiz about Physical and Chemical Changes

Question 1

A student mixed two substances in a test tube, he

noticed that the test tube became warm. He also

noticed an odor coming from the test tube. Based

on Jose's observations, what was

most likely occurring inside the test tube?

Accepted Answer

C. The substances were undergoing a chemical

reaction.

Answer

A. The substances were melting.

Answer

B. The substances were evaporating.

Answer

D. The substances were undergoing an

endothermic reaction.

Question 2

Which of the following models a physical

change?

Accepted Answer

D. A red apple is cut in half.

Answer

A. An apple ripens and turns red.

Answer

B. A nail rusts and becomes reddish brown.

Answer

C. A hamburger is cooked and turns brown.

Question 3

A chemical reaction is occurring for certain when

a

Accepted Answer

B. new substance is formed.

Answer

A. solid dissolves.

Answer

C. steamlike substance is created.

Answer

D. mixture is made.

Question 4

After Billy injured his ankle from falling off his

bicycle, his mother placed an ice pack on his

ankle. Pete noticed that the ice in the ice pack

began to melt after about 30 minutes. What was

demonstrated by the melting ice pack?

Accepted Answer

B. a physical change

Answer

A. a chemical change

Answer

C. a substance being destroyed

Answer

D. a change in the identity of a substance

Question 5

Charcoal is often used for outdoor cooking. When

charcoal burns, ashes are left in the bottom of the

grill. What kind of change has taken place?

Accepted Answer

D. A chemical change has occurred.

Answer

A. A solution has formed.

Answer

B. A physical change has occurred.

Answer

C. A mixture has formed.

Question 6

A container has a mixture of salt and sand in it.

How will adding water to the container help to

separate the salt and sand?

Accepted Answer

C. Salt will dissolve in water, and sand will not.

Answer

A. Salt will not dissolve in water, and sand will.

Answer

B. Salt will sink, and sand will float to the top.

Answer

D. Salt will float to the top, and sand will sink.

Question 7

What will happen if water heats on a stove long

enough?

Accepted Answer

A. The water will evaporate.

Answer

B. The water will melt.

Answer

C. The mass of the water will increase.

Answer

D. The volume of the water will increase.

Question 8

Which of the following is an example of a physical

change?

Accepted Answer

C. ice melting

Answer

A. leaves burning

Answer

B. plant decaying

Answer

D. nail rusting

Question 9

What happens to water after it is heated

for 10 minutes?

Accepted Answer

C. It started to boil, and the liquid in the pot started

to evaporate into a gas.

Answer

A. It started to freeze, and the liquid in the pot

started to turn into a gas.

Answer

B. It started to freeze, and the liquid in the pot

started to turn into a solid.

Answer

D. It started to boil, and the liquid in the pot started

to condense into a solid.

Question 10

Jason poured 500 grams of water into a container and tightly sealed it. The water was allowed to freeze. Which is most likely true about the ice that formed?

Accepted Answer

The mass of the ice is the same as the mass of the water.

Answer

The mass of the ice is greater than the mass of the water.

Answer

The ice formed is a different substance than the water.

Answer

The ice formed is the same temperature as the water.

Question 11

Which process is NOT the result of a chemical

change during a reaction?

Accepted Answer

D. folding paper

Answer

A. digesting food

Answer

B. burning wood

Answer

C. rusting metal

Question 12

Reggie the robot has a brown, flaky substance after being left outside in the rain. What has the rain most likely done to the robot?

Accepted Answer

C. It caused a chemical reaction that rearranged

the atoms in his metal body, causing it to rust.

Answer

A. It caused a chemical reaction that combined the

atoms in his metal body, causing it to melt.

Answer

B. It caused a chemical reaction that heated up the

atoms in his metal body, causing it to burn.

Answer

D. It caused a chemical reaction that broke apart

the atoms in his metal body, causing it to decay.

Question 13

When Sally and her parents first moved into

their house, the brick fireplace was very clean.

Now that they have built a few fires in their

fireplace, the inside is covered with black powder.

Sally's mother tells him this powder is called

soot. Which of the following best explains how

the soot came to be in the fireplace?

Accepted Answer

A. A chemical reaction occurred when wood

burned, making a new substance called soot.

Answer

B. The wood in the fireplace evaporated and made

a new substance called soot.

Answer

C. Some of the bricks in the fireplace melted and

made a new substance called soot.

Answer

D. A chemical reaction occurred between the bricks

and air, making a new substance called soot.

Question 14

A beaker contains a mixture of water, sugar, and sand, which has settled in a glass beaker after it was stirred for a few minutes.How could the water be separated from the

mixture so the beaker only has sugar and sand

left?

Accepted Answer

D. heat the mixture, causing the water to evaporate

Answer

A. filter the mixture, causing the sugar and sand to

get caught but not the water

Answer

B. stir the mixture, causing the water to move

above the sugar and sand

Answer

C. freeze the mixture, causing the water to be

destroyed

Question 15

Lou and Marcus decided to put corks and bolts

into a large plastic container. Later, Lou decided

that the corks should be separated from the bolts.

The corks and bolts can be separated by

Accepted Answer

B. adding water to the mixture.

Answer

A. stirring the mixture with a spoon.

Answer

C. heating the mixture.

Answer

D. cooling the mixture.

Question 16

Folding a piece of paper is a

Accepted Answer

B. physical change.

Answer

A. chemical change.

Answer

C. change of mass.

Answer

D. change of state.

Question 17

When liquids X and Y react, a solid, Z, is formed.

Combining liquids X and Y causes a

Accepted Answer

B. chemical change.

Answer

A. physical change.

Answer

C. change in phase.

Answer

D. change in mass.

Question 18

Bob finds a box of plastic bottle caps and

pennies in her drawer. What is the best way for

her to separate them without touching the

objects?

Accepted Answer

A. place the objects in a bowl of water

Answer

B. pour the objects through a strainer

Answer

C. put the box of objects in the oven

Answer

D. run a magnet through the mixture

Question 19

A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?

Accepted Answer

The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up.

Answer

The mass of the balloon increases because the size of the balloon has increased.

Answer

The mass of the balloon increases because the temperature of the balloon has increased.

Question 20

Luke creates a model to observe the water cycle. He pours water into a clear container and closes the container and weighs it. Two days later, Luke observes about half of the water has evaporated and water droplets have formed on the sides of the container. Which is the weight of the container?

Accepted Answer

The container weighs the same as it did 2 days ago.

Answer

The container weighs much less than it did 2 days ago.

Answer

The container weighs half as much as it did 2 days ago.

Question 21

A 500-gram block of solid cheese is melted in a pot. Which is most likely the mass of the cheese after it is melted?

Accepted Answer

500 grams, because the cheese does not gain or lose mass just because it was melted

Answer

499 grams, because some of the cheese evaporates as it melts

Answer

502 grams, because the cheese absorbs heat as it melts

Question 22

Jason poured 500 grams of water into a container and tightly sealed it. The water was allowed to freeze. Which is most likely true about the ice that formed?

Accepted Answer

The mass of the ice is the same as the mass of the water.

Answer

The mass of the ice is greater than the mass of the water.

Answer

The ice formed is a different substance than the water.

Answer

The ice formed is the same temperature as the water.

Question 23

Jamie weighs a glass of water and observes its weight to be 12 ounces. Jamie then adds 6 ice cubes to the glass of water. Each ice cube weighs one ounce. After all of the ice cubes have melted, what will be theapproximate weight of the glass of water?

Accepted Answer

18 ounces

Answer

6

Answer

12

Question 24

A 55-gram egg is placed in a pot. After the egg is boiled, which is most likely the mass of the egg?

Accepted Answer

55

Answer

50

Question 25

Jane took a 1 ounce slice of bread and cut it into 2 pieces. On one side, she put 2 ounces of peanut butter. On the other side she put 1 ounce of jelly. Which will most likely be the weight of the finished sandwich?

Accepted Answer

4

Answer

Jane took a 1 ounce slice of bread and cut it into 2 pieces. On one side, she put 2 ounces of peanut butter. On the other side she put 1 ounce of jelly. Which will most likely be the weight of the finished sandwich?

Answer

3 ounces

Answer

6 ounces

Question 26

Bob puts 200 grams of ice into a pitcher with 900 grams of water. He gets distracted and comes back later to find that the ice has melted in the water. How many grams of water does Bob now have in the pitcher?

Accepted Answer

1,100 g

Answer

200 g

Answer

700 g

Question 27

Rodney tears a piece of paper weighing 1 oz into small pieces. What most likelyhappens to the weight of the sheet of paper after Rodney tears it into pieces?

Accepted Answer

The weight stays the same.

Answer

The

Answer

The weight is cut in half.

Question 28

Is digestion an example of a physical change or a chemical change?

Accepted Answer

Chemical Change

Answer

Physical Change

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