What kind of change is shown by tearing of paper?

2

(a)

Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings.

2

(a)

Name the gas which turns lime water milky.

2

(a)

Write the colour of copper sulphate solution obtained when iron nails are dipped in it?

2

(a)

What colour of flame is observed when magnesium ribbon burnt in air.

2

(a)

What is the nature of magnesium oxide solution?

2

(a)

Name the metals which are mixed (alloyed) with iron to make stainless steel.

2

(a)

Suggest two methods to prevent rusting.

2

(a)

Make a list often changes you have noticed around you.

2

(a)

What do you consider explosion of cracker a chemical change?

2

(a)

What happens when a new substance is formed in a chemical reaction?

2

(a)

A fraction of ship's iron part has to be replaced every year. Explain?

2

(a)

Write the characteristics of a chemical change

2

(a)

Which gas is called natural shield against the radiation? Explain, how?

2

(a)

Explain the activity of burning of magnesium ribbon.

2

(a)