Changes in Matter

Katie has a model car. She takes the parts of the car and places them on a digital scale. All of the parts have a mass of 85 grams. She then puts the model together and places it on the digital scale again. What can Katie most likely say about the mass of the toy car?

• It will have less mass than all of the parts.
• It will have more mass than all of the parts.
• It will have twice the mass of all of the parts.
• It will have the same mass as all of the parts.

Tucker and Hailey share a mini pie. Each of the slices has the exact same mass.What can Tucker and Hailey conclude about the whole pie?

• The mass of each slice will be the same as the whole pizza.
• The total mass of all of the slices will be the same as the whole pizza.
• The mass of each slice will be greater than the whole pizza.
• The total mass of all of the slices will be less than the whole pizza.

Mr. Grace’s science class is learning that substances can change in many ways. Sometimes a change will produce a new substance. Which of the following is an example of a change that results in a new substance?

• eggs frying in a pan
• water freezing into ice
• paper being shredded
• lump of clay being broken in two

Mrs. Koo left a watering can in her garden for several weeks. During this time, it rained often. How does Mrs. Koo know that a change has taken place in the watering can that resulted in a new substance?

• The can is wet.
• The paint is peeling.
• The water has evaporated.
• The can has reddish rust.

Misty and her family are hiking in the woods. They see a tree and some plant matter that is decaying. Misty knows that decaying is a chemical change which results in new substances. What does Misty and her family observe about the tree and plant matter that is evidence a chemical change has happened?

• a change in size and shape
• a change in color and smell
• a change in texture and shape
• a change in size and hardness

The students in Mrs. Gartner’s class conduct an experiment on the conservation of mass. The class puts all of their results in a chart. Charlie’s data is much different from everyone else’s results. Which statement best explains why this has happened?

• Charlie did not add her results to the chart correctly.
• Charlie is more careful than the other students.
• Charlie is a better scientist than the other students.
• Charlie did not do the experiment correctly.

Mrs. Fennel’s science class is investigating how long it takes for water to boil when put on a hot plate. Which of the following is MOST LIKELY why the groups might all get different results?

• The groups followed the same procedures.
• The groups used different amounts of water.
• The groups worked at different times of day.
• The groups did not measure the temperature of the water.

Scientists use different processes to investigate scientific questions. The methods that scientists use to investigate questions can vary. During which part of an investigation would a scientist gather evidence?

• asking a question
• analyzing the results
• conducting an investigation
• drawing conclusions

Miss Malone asked her science class what would happen if a substance were to undergo a chemical change. The students said that a new substance would be formed. Which of the following would NOT provide evidence that supports the students’ claim?

• change in odor
• change in color
• presence of bubbles
• change in size or shape

Some students are experimenting with mass of objects. The mass of a toy rocket is 20 grams. The students predict that the mass of a toy rocket will be the same if they take apart the rocket and find the mass of all the rocket parts. Which of the following will best support the students’ prediction?

• The pans of the balance will be even.
• The balance will tilt to the side of the mass
• The pans of the balance will rock back and forth.
• The balance will tilt to the side of the rocket parts.