Question 1 (e)
Classify the following as chemical or physical changes:
e. Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases

Q.

Classify the following as chemical or physical changes:

• Cutting of trees

• Melting of butter in a pan

• Rusting of almirah

• Boiling of water to form steam

• Passing of electric current through water, and water breaking down into hydrogen and oxygen gas

• Dissolving common salt in water

• Making a fruit salad with raw fruits

• Burning of paper and wood

Q. Question 1(b)
Classify the changes involved in the following processes as physical or chemical changes:

Dissolving sugar in water

Q. Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water.

Q. Question 1 (f)
Classify the following as chemical or physical changes:
f. Dissolving common salt in water

Q. Question 1 (d)
Classify the following as chemical or physical changes:
d. Boiling of water to form steam