State whether the following statements are True or False Melting of wax is necessary for burning a candle

State whether the following statements are True or False Melting of wax is necessary for burning a candle

State whether the following statements are True or False. In case a statement is False, write the correct statement.

Question 1.

Melting of wax is necessary for burning a candle. (True/False)

Answer:

True

Question 2.

Collecting water vapour by condensing involves a chemical change. (True/False)

Answer:

False: Collecting water vapour by condensing involves a physical change.

Question 3.

The process of converting leaves into compost is a chemical change. (True/False)

Answer:

True

Question 4.

Mixing baking soda with lemon juice is a chemical change. (True/False)

Answer:

True

Fill in the blanks in the following statements:

Question 1.

Nalini observed that the handle of her cycle has got brown deposits. The brown deposits are due to ............ , and this is a ............ change.

Answer:

rusting, chemical

Question 2.

Folding a handkerchief is a ............ change and can be .............

Answer:

physical, reversed

Question 3.

A chemical process in which a substance reacts with oxygen with evolution of heat is called ............ , and this is a ............ change.

Answer:

combustion, chemical

Question 4.

Magnesium, when burnt in air, produces a substance called ............. The substance formed is ............ in nature. Burning of magnesium is a ............ change.

Answer:

magnesium oxide, basic, chemical