Question

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ASSIGNMENT-7
SUBJECT - SCIENCE
CLASS - VI
Q1. Classify the changes involved in the following processes as
physical or chemical changesc
ə) Photosynthesis
b) Dissolving sugar in water
c) Burning of coal
d) Melting of wax
e) Beating aluminium to make aluminium foil
) Digestion of food
Q2. Fill in the blanks:
a) When carbon dioxide is passed through time water, it turns
milky due to the formation of
b) The chemical name of baking soda is
c) Two methods by which rusting of iron can be prevented are
and
d) Changes in which only
properties of a substance
change are called physical changes.
e) Changes in which new substances are formed are called
changes
Q3. When baking soda is mixed with lemon juice; bubbles are formed
with the evolution of a gas. What type of change is it? Explain
Q4. When a candle burns, both physical and chemical changes take
face. Identify these changes. Give another example of a familiar
ress in which both the chemical and physical changes take place.​

Answer 1

Answer:

Q1 :

a) Chemical

b) Physical

c) Chemical

d) Physical

e) Physical

f) Chemical

Q2 :

a) Milky

b) Sodium Bicarbonate

c) Galvanization, Painting

d) Physical

e) Chemical

Q3 :

Neutralization reaction, as an acid (lemon juice) reacts with a base (baking soda) to form salt and water.

Q4 :

Physical - Melting of wax

Chemical - Burning of candle

*Other example -- Burning of wood, where physical change is vaporization of H²O and chemical change is burning of wood to ashes.

Hope this helps you.... I recommend you to learn these answers as no one will give you answers in exams, and should pay attention in the class so that you won't depend on others during tests and exams...

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