During summer holidays, a group of children collected a lump of salt, green grass, broken glass piece, a small thermocol box, pen, iron nail, glass marbles, hair, naphthalene ball, a piece of sugar candy (mishri) and tried to group them on the basis of properties given in table. Help them in filling the table.

Name of Material Hardness
(Hard/Soft) Transparency
Transparent
Translucent/Opaque

....................... ....................... .......................

....................... ....................... .......................

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Solution

Name of the material Hardness
(Hard/Soft) Transparency
(Transparent
Translucent/Opaque)

Lump of salt Hard
(0.5 Marks) Opaque
(0.5 Marks)

Green grass Soft
(0.5 Marks) Opaque
(0.5 Marks)

Broken glass piece Hard
(0.5 Marks) Transparent
(0.5 Marks)

A small thermocol box Soft
(0.5 Marks) Opaque
(0.5 Marks)

Pen Hard
(0.5 Marks) Opaque
(0.5 Marks)

Iron nail Hard
(0.5 Marks) Opaque
(0.5 Marks)

Glass marbles Hard
(0.5 Marks) Transparent
(0.5 Marks)

Hair Soft
(0.5 Marks) Opaque
(0.5 Marks)

Naphthalene ball Hard
(0.5 Marks) Opaque
(0.5 Marks)

A piece of sugar candy (Mishri) Hard
(0.5 Marks) Translucent
(0.5 Marks)

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Q.
During summer holidays, a group of children collected a lump of salt, green grass, broken glass piece, a small thermocol box, pen, iron nail, glass marbles, hair, naphthalene ball, a piece of sugar candy (mishri) and tried to group them on the basis of properties given in table below. Help them in filling the Table.

Name of the material

Appearance (Hard/soft)

Transparency

(Transparent/Translucent/

Opaque)

Floats/ Sinks in water

Soluble/ Insoluble in water

Question 18

During summer holidays, a group of children collected a lump of salt, green grass, broken glass piece, a small thermocol box, pen, iron nail, glass marbles, hair, naphthalene ball, a piece of sugar candy (mishri) and tried to group them on the basis of properties given in table. Help them in filling the table.

$\begin{matrix} Name of the & Appearance & Transparency & Floats/Sinks & Soluble / Material & (Hard/Soft) & (Transparent / & in water & insoluble in Translucent/Opaque) & Water . . . . . . . . . . & . . . . . . . . . . & . . . . . . . . . . & . . . . . . . . . . & . . . . . . . . . . . . . . . . . . . . & . . . . . . . . . . & . . . . . . . . . . & . . . . . . . . . . & . . . . . . . . . . \end{matrix}$

Q. (a) Chalk and aluminium foil usually look different from each other. Give a property by which we can prove that these materials are different. [1 mark]

(b) Metals have lustre (shine). Give a reason why some metal articles become dull and lose their shine after some time. [1 mark]

(c) Mixtures of red chilli powder in water, butter in water, petrol in water, and vinegar in water were given to Radha, Sudha, Sofia and Raveena, respectively. Whose mixture is in solution form? [1 mark]

(d) During the summer holidays, a group of children collected a small thermocol box and a piece of sugar candy (mishri) and tried to group them on the basis of properties such as floatation and solubility in water by making a table. What would that table look like? [2 marks]

Q. Classify the following objects based on the given properties and complete the table.

Objects	Transparency	Conductivity
Glass piece
Thermocol box
Iron nail
Copper wire
Butter paper

What is meant by (a) transparent materials, (b) translucent materials, and (c) opaque materials ? Give two examples each of transparent, translucent and opaque materials

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Name of Material	Hardness (Hard/Soft)	Transparency Transparent Translucent/Opaque
.......................	.......................	.......................
.......................	.......................	.......................

Name of the material	Hardness (Hard/Soft)	Transparency (Transparent Translucent/Opaque)
Lump of salt	Hard (0.5 Marks)	Opaque (0.5 Marks)
Green grass	Soft (0.5 Marks)	Opaque (0.5 Marks)
Broken glass piece	Hard (0.5 Marks)	Transparent (0.5 Marks)
A small thermocol box	Soft (0.5 Marks)	Opaque (0.5 Marks)
Pen	Hard (0.5 Marks)	Opaque (0.5 Marks)
Iron nail	Hard (0.5 Marks)	Opaque (0.5 Marks)
Glass marbles	Hard (0.5 Marks)	Transparent (0.5 Marks)
Hair	Soft (0.5 Marks)	Opaque (0.5 Marks)
Naphthalene ball	Hard (0.5 Marks)	Opaque (0.5 Marks)
A piece of sugar candy (Mishri)	Hard (0.5 Marks)	Translucent (0.5 Marks)