Physical and Chemical Changes

Is burning a chemical change?

• Yes

• No

• Can't be determined

• Not possible

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these is a physical change?

• burning a candle

• folding a paper

• Rolling chalk powder to make a piece of chalk

• Rusting of iron

What are physical changes?

• A change which is mostly reversible

• It's not found till now and scientists are still working on this

• A change in which a substance undergoes a change in it's physical properties

• A change in which no new substance is formed

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NGSS.MS-PS1-4

What does this figure shows

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the process of depositing zinc on the surface of iron to prevent rusting called?

What happens after burning magnesium ribbon?

• We need to add water

• White coloured light of fire will come

• Nothing will happen

• It will not burn only

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NGSS.MS-PS1-2

NGSS.MS-PS1-4

The change of burning magnesium tape can be represented by the following equation:

• Mg + CO2 = MgO2

• Mg + O2 = MgO

• Mg + O2 = MgO2

• Mg + CO2 = MgO

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

What will be the equation after adding water to magnesium tape's ashes?

• Mg2 + H2O = Mg(OH2)

• Mg + HO2 = Mg(HO2)

• Mg + H2O = Mg(OH2)

• Mg2 + HO2 = MgH2

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Name the process:-

large crystals of pure substances can be formed from the solution by this process.

What does Ozone convert in oxygen?

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NGSS.HS-PS4-3