The video explains the differences between physical and chemical changes. Physical changes do not alter the chemical identity of a substance, such as crumpling paper or freezing water. Chemical changes result in new substances, like burning paper or rusting iron. The video also covers phase changes like boiling and melting, which are physical changes, and highlights examples of chemical reactions, including combustion and corrosion.

What type of change occurs when paper is crumpled?

• Chemical change

• No change

• Physical change

• Biological change

What is produced when paper is burned?

• Only heat

• Carbon dioxide and water vapor

• Water only

• Only ash

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What remains constant when water freezes?

• Volume

• Physical state

• Chemical formula

• Temperature

What is the result of the electrolysis of water?

• Carbon dioxide and water

• Hydrogen only

• Hydrogen and oxygen gases

• Sodium and chlorine gases

Tags

NGSS.MS-PS1-5

What happens to iron when it rusts?

• It loses mass

• It gains carbon

• It forms iron oxide

• It becomes more conductive

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What remains unchanged when ice melts into water?

• Shape

• Chemical identity

• Mass

• Volume

Tags

NGSS.MS-PS1-4

What is deposition in terms of state change?

• Gas to liquid

• Liquid to solid

• Gas to solid

• Solid to gas

Tags

NGSS.MS-PS1-4

What is sublimation?

• Liquid to gas

• Solid to gas without becoming liquid

• Solid to liquid

• Gas to solid

Tags

NGSS.MS-PS1-4

What does pulling copper into a wire demonstrate?

• Chemical change

• Physical change

• Destruction of material

• No change

What indicates a chemical change when silver tarnishes?

• Change in weight

• Change in color

• Change in state

• Change in volume

Tags

NGSS.MS-PS1-2