Question

When an incense stick is lit, we can sense the smell in the whole room. This is due to
a. evaporation
b. diffusion
c. heating-osmosis
2. Medicines like ampicillin and tetracycline is used to treat
a. infection
b. relieve pain
c. control fever
3. Evaporation of liquid occurs at any temperature below its
a. Freezing point
b. Boiling point
c. Melting point
4. The ratio of Hydrogen to Oxygen of water is
a. 2 :1
b. 1:2
c. 1:1
Question 2: Write briefly the contribution of the following Chemist. [4]
a. Dimitri Mendeleev
b. Antoine Lavoisier
c. John Dalton
d. Van Helmont
Question 3: Find the odd one out and give reasons: [4]
a. Mg , P , S, Au
b. Krypton, Xenon , Oxygen , Radon
c. Mercury, Aluminum, Sodium, Calcium.
d. Conical flask, Round bottom flask, Flat bottom flask, Beaker

Middle School 2020-21

First Term Examination

Page 2 of 2

Question 4: Define the following terms: [5]
a. Sedimentation
b. Matter
c. Symbol
d. Molecule.
e. Chemistry
Question 5: Rahul performed the following set of experiments in the laboratory. Help him to record
his observations. [6]

a. He placed Ice in a beaker and kept it aside. What did you
observe?

Name the
process

Name the term
used

b. He took the solution formed in the above beaker
and boiled it carefully.

What did you
observe?

Name the
process

Name the term
used

c. He placed an evaporating dish over the surface of
the boiling water.

What did you
observe?

Name the
process

Name the term
used

Question 6: Differentiate between the following as per instructions given in the bracket: [10]
a. Compound and Mixture (Two examples )
b. Solids and liquids ( Compressibility and Diffusion )
c. Alcohol and Copper sulphate crystals (State of matter)
d. Metallic and Non-metallic elements (2 Properties )
e. Homogeneous & Heterogeneous Mixture (2 Examples)
Question 7: Answer the following: [4]
1. Write the chemical formula of
a. Aluminium Carbonate
b. Calcium Hydroxide

2. Write any two characteristic features of mixture.
Question 8: With the help of a diagram explain that solids expand on heating.

Answer 1

Answer:

pls follow me

and make me brainliest it's too hard I can't

Answer 2

Answer:

. evaporation

relieve pain

Mg , P , S, Au