Chemistry first term exam 26/07/ 2022

 Section -A[30]

1. Fill in the blanks- [6]

A. Air is a matter because it has........ and occupies .......

B. .......... and .......... are pure substances.

C.In a ....... the substance are not combined chemically.

D. Petrol is ........ in nature.

2. Match the following-                [6]

A. Evaporation of water      a. Fast change

B. Milk turning sour            b. Non periodic

C. Earthquake                        c. Periodic change

D. Change of season              d. Chemical change

E. Glowing of bulb                  e. Reversible change

F. Bursting of cracker             f. Physical change

3. Name the main metal present in the following- [6]

A. Hemoglobin

B. Chalk

C. Chlorophyll

D. Chocolate wrapper

E. Common Salt

F. Marble

4. Write the symbols of -     [6]

A.Helium

B. Silver

C.Krypton

D.Antimony

E Barium

F.Sodium

5 name the terms for the following- [3×2=6]

A. The change of a solid into liquid

B. The change of vapour into a liquid

C. The process due to which is solid directly changes into its vapours

Section B[30]

6 Define: [5×2=10]

A. Chromatography

B. Sedimentation

C. Matter

D. Physical change

E. Compound

7.Mention three needs for the separation of components of mixture. [3]

8. Write down the formula for the following: [6×1=6]

A. Calcium oxide

B. Glucose

C. Sand

D. Sodium carbonate

E. Water

F. Sodium Sulphate

9. What are the different types of elements. Name and explain. [4]

10 mention three characteristics of chemical change. [3]

11. Give two characteristics of particles of matter. [2]

12. Differentiate between homogenous and heterogeneous mixture. [2]