You are provided with the following materials—vinegar,
honey, mustard oil, water, glucose and wheat flour.
Make any two pairs of materials where one material is
soluble in the other. Now, make two pairs of materials where
one material remains insoluble in the other material.
(i) Who am I? Identify me on the basis of the given
properties.
(a) I have lustre.
(b) I can be easily compressed.
(c) I am hard and soluble in water.
(d) You cannot see clearly through me.
(e) I have mass and volume but you
cannot see me.
(ii) Make your own ‘Who am I?’
Imagine you have two mysterious materials, X and Y. When
you try to press material X, it feels rigid and does not change
its shape easily. On the other hand, material Y easily changes
its shape when you press it. Now, when you mix both
materials in water, only material X dissolves completely while material Y remains unchanged. What can materials
X and Y be? Can you identify whether material X is hard or
soft? What about material Y? Justify your answer.
Air is all around us but does not hinder us from seeing each
other. Whereas, if a wooden door comes in between, we
cannot see each other. It is because air is
and the wooden door is . Choose the most
appropriate option:
(i) transparent, opaque
(ii) translucent, transparent
(iii) opaque, translucent
(iv) transparent, translucent
You need to have containers for collection of (i) food waste,
(ii) broken glass and (iii) wastepaper. Which materials will
you choose for containers of these types of waste? What
properties of materials do you need to think of?
We see chairs made up of various materials, such as wood,
iron, plastic, bamboo, cement and stones. Following are
some desirable properties of materials which can be used
to make chairs. Which materials used to make chairs fulfil
these properties the most?
(i) Hardness (does not bend or shake on sitting even after
long use).
(ii) Lightweight (easy to lift or to take from one place to
another).
(iii) Does not feel very cold when sitting during winters.
(iv) Can be cleaned regularly and made to look new even
after long use.
State whether the statements given below are True [T] or
False [F]. Correct the False statement(s).
(i) Wood is translucent while glass is opaque. [ ]
(ii) Aluminium foil has lustre while an eraser
does not. [ ]
(iii) Sugar dissolves in water whereas sawdust
does not. [ ]
(iv) An apple is a matter because it occupies no
space and has mass. [ ]
The containers which are used to store materials in shops and
at home are usually transparent. Give your reasons for this.
Visit your kitchen and observe how your parents have
organised various edibles. Can you suggest a better sorting
method? Write it in your notebook.
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