Fill in the blanks

1.     Temporary change in a substance is a ______ type of change.

2.     Permanent change in a substance is a _______ type of change.

3.     When _____ change occurs a chemical reaction takes place.

4.     Reactants are always represented on the _______ side of the chemical equation.

5.     Products are always represented on the _______ side of the chemical equation.

6.     When two or more substances combine to form a single product, then the reaction is known as ________ reaction.

7.     The pale yellow silver bromide turns grey when exposed to _______

8.     When more reactive element removes the another element, having less reactivity, from its compound, then the reaction is ________

9.     When oxidation and reduction takes place simultaneously, it is a _________ reaction.

10. Rancidity is due to ________ of oil.

11. When iron is exposed to moist air, it undergoes _______ reaction.

12. The reddish brown deposit formed on iron nails kept in a solution of copper sulphate is _____

13. Barium chloride when reacts with ammonium sulphate form barium sulphate and ammonium chloride. This is ______________ type of chemical reaction.

14. Reaction of iron nails with copper sulphate solution is an example of ___________ reaction.

15. The substances that undergo change during chemical reaction are called ________

16. _________ are used to prevent oxidation of food containing fats and oils.

ANSWERS

1)    Physical

2)    Chemical

3)    Chemical

4)    Left

5)    Right

6)    Chemical Combination

7)    Sunlight

8)    Chemical Displacement

9)    Redox

10)            Oxidation

11)            Oxidation

12)            Copper metal

13)            Chemical double displacement/decomposition

14)            Chemical Displacement

15)            Reactants

16)            Antioxidants