Checkpoint Physical and Chemical Changes

Open Ended

Give Examples of a Physical Change

Open Ended

Give Examples of a Chemical Change

Open Ended

Dr. Garret Sho takes a piece of notebook paper from her desk. As a demonstration she tears the paper into 14 pieces.

After Dr. Sho tears the paper, what would you expect to happen to the mass of the torn pieces?

Draw

Draw an example of a Physical and Chemical Change

Multiple Choice

What is the Mass of CO2? Hint think about the Law of Conservation of Mass.

• 12.0g

• 6.2g

• 46.2g

• 20.0g

Multiple Choice

Review the information in the graph. Which of these statements is true?

• The change from ice of liquid water is a chemical change.

• The change from liquid water to water vapor is a physical change.

• It takes the same amount of time for ice to melt as it does for liquid water to become water vapor.

• The change from ice to liquid water to water vapor shows a decrease in mass due to the changes in states of matter.

Multiple Choice

There are characteristics that differentiate a chemical change from a physical change.  Which statement describes a physical change?

• Iron combines with oxygen to form rust

• Lead is heated and becomes melts into a viscous liquid.

• Sodium metal reacts explosively with oxygen

• Calcium is added to acid and hydrogen gas is produced

Multiple Choice

Jatorian is exploring the properties of iron. She takes a large iron nail and finds that the nail does not attract other metal objects. Next, she uses a battery and copper wire to transform the nail into an electromagnet. When she connects the circuit, the nail becomes magnetic and can pick up small metal objects like paper clips. This is shown in the illustration below.

What best describes what has happened to the iron in the nail that causes it to become magnetic?

• A physical change has occurred, because the chemical properties of the iron remain the same.

• A physical change has occurred, because there is a chemical attraction between the iron and paper clips.

• A chemical change has occurred, because there is a chemical attraction between the iron and paper clips.

• A chemical change has occurred, because the chemical energy in the battery is transformed into magnetic energy in the iron.

Multiple Choice

Review the information in the graph. Which of these statements is true?

• The change from ice of liquid water is a chemical change.

• The change from liquid water to water vapor is a physical change.

• It takes the same amount of time for ice to melt as it does for liquid water to become water vapor.

• The change from ice to liquid water to water vapor shows a decrease in mass due to the changes in states of matter.

Poll

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