Question

A new substance is formed in a ______________change. A solid expands on___________________. Boiling of an egg is a _____________change. Only the physical properties changes into a __________change. Substances that combine together to form a new substance are called_____________ Which type of change is roasting of groundnuts? a. Physical b. Reversible c. Irreversible d. Temporary Changes that are brought by humans are __________. a. natural b. physical c. permanent d. man made Which of the following changes can be reversed? a. cooking of food b. rusting of iron c. burning of wood d. expansion of metals Changes can occur due to ___________. a. heating b. cooling c. pulling d. all of these The process of changing water into water vapours is called ___________. a. sublimation b. condensation c. evaporation d. contraction Formation of curd is because of this microorganism a. Fungi b. Virus c. Bacteria d. Worms Which of the following is a chemical change? a. Melting of wax b. Baking of cookies c. Formation of clouds d. Drying of cloths Hissing sound in soda bottle is because of this gas a. Oxygen b. Nitrogen c. Carbon dioxide d. None of these When you heat solids, it shows a. Contraction b. Expansion c. Change in color d. None of these 20. A new substance is formed in this change. a. Physical b. Chemical c. Reversible d. None of these

Answer 1

1.chemical

2.heating

3.chemical

4.physical change

5.compound

6.irreversible

7.man made

8.expansion of metals

9.allof these

10.condensation

11.bacteria

12. baking of cookies

13.??

14.expansion

15. chemical

Answer 2

Answer:

chemical,melting,chemical,..,reactants,physical,manmade,expansion of metal,heating, evaporation,bacteria, melting of wax,carbon dioxide, all,chemical