Changes around us

Changes around us

ELO's for the class

At the end of this class, you will be able to:

1. differentiate between reversible and irreversible changes
2. Classify any given change as physical/chemical.

Reversible change

• Final substance can be brought back to original form.

• Change that can be reversed.

Multiple Choice

In any reversible change

• final substance cannot be brought back to its original form

• final substance can be brought back to its original form

• new substance is formed

Multiple Choice

Pick the reversible change

• Crushing paper

• Tearing a piece of cloth

• burning paper

Irreversible change

• Final substance cannot be brought back to its original form

• Change that cannot be undone

Multiple Choice

Pick the irreversible change

• Bursting balloons

• Melting ice

• Folding clothes

Physical change

• Change in the physical properties like size, shape, or state.

• No new substance formed

• Mostly reversible

Multiple Choice

Which one is true about physical changes?

• new substance is formed

• there is change in chemical composition

• no new substance is formed

Multiple Choice

Pick the physical change

• burning paper

• bursting balloons

• frying potatoes

Chemical change

• Change in the chemical composition

• New substance is formed

• Mostly irreversible

Multiple Choice

Which of the following is true about chemical changes?

• No new substance is formed

• New substance is formed

• All chemical changes are reversible

Multiple Choice

Which of them is not a chemical change?

• Baking cake

• Rusting of iron

• Cutting vegetables

SUMMARY

1. Any change in which the final substance can be brought back to its original form is called a reversible change.
2. An irreversible change is one which cannot be undone.
3. In any physical change, no new substance is formed.
4. In a chemical change, new substance is formed.