Physical and chemical changes

Digestion of food is

• Chemical change

• Physical change

• Crystallization

• Rusting

Click the INCORRECT statements:

• A chemical change is a reversible change

• A physical change is a reversible change

• Cooking food is a physical change

• Crushing a paper is a physical change

Is the breaking of a glass a physical change?

• YES

• NO

Exploding Fireworks?

• Physical Change 
• Chemical Change 

A group of students investigated physical and chemical changes using paper.  The students recorded their observations in a table.
Which student correctly recorded all the changes that took place?

• Student 1
• Student 2
• Student 3
• Student 4

Identify the chemical change from the following:

• Melting of wax

• Digestion of food

• Tearing of paper

• Melting of ice

Burning of paper is

Click the INCORRECT statements:

• A chemical change is a reversible change

• A physical change is a reversible change

• Cooking food is a physical change

• Crushing a paper is a physical change

A change is a chemical change when it is accompanied by:

• Energy change

• Formation of new substances

• Change in chemical properties

• ALL OF THE ABOVE

For rusting, presence of ________ and ________ is essential.

• Water only

• Carbon dioxide and water

• Oxygen and water

• Nitrogen and oxygen