Material changes Flashcards

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1
Q

What is the difference between chemical reaction and physical change ?

A

Chemical reaction : It forms a new substance and cannot be reversed back

Physical change : It changes physical matters but it is réversible

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2
Q

What is another word for burning ?

A

Combustion

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3
Q

How do we test for the presence of carbon dioxide ?

A

Use limewater

And if carbon dioxide is present the water will become foggy and milky

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4
Q

What causes rusting or a metal ?

A

Water and oxygen

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5
Q

What happens when something burns ?

A

Reacts with oxygen in the air and sometimes form ashes called hydroxide

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6
Q

Is rusting a chemical reaction or physical change ?

A

Chemical reaction

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7
Q

How do we prevent rusting a metal ?

A

Paint it

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