How does matter change from one state to another

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Useful substance in preparation of freezing mixture is

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Which gas boils out first during fractional distillation of air.

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

When does ice melt at the same temperature $0 ° C$ (273 Kelvin), which one of the following has more energy?

EASY

Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

A magnet attracts :

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

The melting point of naphthalene is

80 ° C

and the room temperature is

30 ° C

. A sample of liquid naphthalene at

100 ° C

is cooled down to the room temperature. Draw a temperature time graph to represent this cooling. In the graph, mark the region which corresponds to the freezing process.

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Dry ice is

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Latent heat of vaporisation is

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Explain how is nuclear energy generated in power reactors. How is electricity produced from nuclear energy?

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

An earthen pitcher used in summer cools water in it essentially by evaporation of water from its porous surface. If a pitcher carries

4 kg

of water and the rate of evaporation is

20 g

per hour, temperature of water in it decreases by

Δ T

in two hours. The value of

Δ T

is close to (ratio of latent heat of evaporation to specific heat of water is

540 ° C

)

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Explain the liquefaction and zone refining method of refining of metals. (draw diagram)

EASY

Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Write down the two benefits of use of solar energy.

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

1 kg

of ice at

- 20^{o} C

is mixed with

2 kg

of water at

90^{o} C

. Assuming that there is no loss of energy to the environment, what will be the final temperature of the mixture? (Assume latent heat of ice

= 334.4 kJ {(kg)}^{- 1}

, specific heat of water and ice are

4.18 kJ {(kg - K)}^{- 1}

and

2.09 kJ {(kg - K)}^{- 1}

, respectively.)

EASY

Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Write names of any two energies produced in ocean.

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Which of the following curves best represents the variation in density of water with temperature?

EASY

Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Nowadays bio-diesel is used in transportation vehicles as an alternate to diesel. Write two advantages of this measure.

EASY

Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Which of the following is not an example of a bio-mass energy source?

EASY

Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Uranium is used to obtain:

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

The Clausius-Clayperon equation helps to calculate

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Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

A Carnot freezer takes heat from water at

0^{o} C

inside it and rejects it to the room at a temperature of

27^{o} C .

The latent heat of ice is

336 \times 10^{3} J k g^{- 1} .

If 5kg of water at

0^{o} C

is converted into ice at

0^{o} C

by the freezer, then the energy consumed by the freezer is close to :

HARD

Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Assume that a drop of a liquid evaporates by a decrease in its surface energy so that its temperature remains unchanged. The minimum radius of the drop for this to be possible is. (The surface tension is

T

, the density of the liquid is

ρ

and

L

is its latent heat of vaporisation.)

How does matter change from one state to another?

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