A Physical Change Causes the Properties to Change

Change in size ...

• Chemical Change

• Physical Change

Evidence of a physical change.

• New substance

• Shape Change

• Light produced

• Gas released.

Which of the following is a correct statement about the investigations?

• All of the situations are examples of physical changes because all of the investigations exhibit changes to the physical properties.

• None of the situations are examples of physical changes because they all involve a color change.

• Situation 2 is a physical change because rust forming is a natural process.

• Situations 1 and 3 are physical changes because no new substances are formed.

Tags

NGSS.MS-PS1-2

What type of change can be easily reversed?

• chemical change

• physical change

• both chemical and physical changes

• neither physical or chemical changes

Tags

NGSS.MS-PS1-4

Which of the following examples is a physical change but NOT a change of state of matter?

• logs burning

• water freezing into ice cubes

• candle wax melting

• paper being cut

A student is investigating changes with common classroom materials. Which of the following BEST describes the conclusion the student can make about the investigations?

• The paperclip shows evidence of a physical change by changing the shape of the object, whereas the pencil eraser and hole puncher show evidence of a physical change by changing the size of the object.

• All three investigations show evidence of a physical change due to a change in the color of the original substance.

• The paperclip and hole puncher shows evidence of a physical change by changing the chemical properties of the original object, whereas the pencil eraser shows evidence of a physical change by changing the size of the object.

• All three investigations show evidence of a physical change due to a change in state of matter.

A teacher takes a tray of ice cubes out of the freezer. Each student takes an ice cube and holds it in their hands. They make the observations listed in the chart. The student claims that changing the temperature of the water causes a physical change that turns water into ice.

Which argument BEST supports the student’s claim?

• The ice cube is melting in the student’s hand since the hands are much warmer than the ice. Heat is being added to the ice, which causes the particles to move faster.

• The ice cube is freezing in the student’s hand since the hands are much warmer than the ice. Heat is being removed from the ice, which causes the particles to move slower.

• The ice cube is melting in the student’s hand since state is changing from a solid to a liquid. Heat is being removed from the ice, which causes the particles to move faster.

• The ice cube is melting in the student’s hand since state is changing from a liquid to a solid. Heat is being added to the ice, which causes the particles to move slower.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Which of the following is a physical change?

•  Iron is oxidized to iron oxide

• Aluminum metal is pounded into thin sheets

• Copper reacts with a strong acid

• Sodium metal explodes on contact with water

Jolene wants to experiment with sugar cubes. Which of the following causes a sugar cube to only change physically, not chemically?

• burning the sugar cube with a match

• crushing the sugar cube and dissolving it in water

• dehydrating the sugar cube with sulfuric acid

• chewing the sugar cube and digesting it

Tags

NGSS.MS-PS1-2

A physical change occurs when…

•  both the appearance of a substance and its phase change.

• the appearance of a substance changes but its phase does not.

• the phase of a substance changes but its appearance does not.

•  neither the appearance of a substance nor its phase changes.