Chemical vs Physical Changes in Everyday Life

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 sublimation, and metal reactions such as zinc with acid and silver tarnishing.

What type of change occurs when you crumple a piece of paper?

• No change

• Both chemical and physical change

• Physical change

• Chemical change

What happens to the chemical identity of a substance during a chemical change?

• It disappears

• It becomes a mixture

• It changes to a new identity

• It remains the same

What type of change is freezing water into ice?

• Both chemical and physical change

• Physical change

• No change

• Chemical change

What is the result of electrolysis of water?

• Water remains unchanged

• Water turns into ice

• Water breaks down into hydrogen and oxygen gases

• Water evaporates

What type of change occurs when gasoline burns in a car engine?

• Physical change

• Chemical change

• No change

• Both chemical and physical change

What happens to iron when it rusts?

• It evaporates

• It turns into iron oxide

• It remains as iron

• It melts

What type of change is boiling water into steam?

• No change

• Both chemical and physical change

• Physical change

• Chemical change

What is sublimation?

• Liquid to gas

• Gas to liquid

• Solid to liquid

• Solid to gas

What type of change occurs when zinc reacts with acid?

• No change

• Chemical change

• Physical change

• Both chemical and physical change

What happens to silver when it tarnishes?

• It turns into silver sulfide

• It remains shiny

• It melts

• It evaporates