Science One word answer.

What is the physical state of water:
at 250°C?

Name one property of liquids and gases which tells us that their molecules are moving constantly.

What is the physical state of water:
at 100°C?

Convert the temperature of 573K to the Celsius scale.

Name two gases which are supplied in compressed form in homes and hospitals.

‘A substance has a definite shape as well as a definite volume’. Which physical state is represented by this statement?

The Kelvin temperature is 270K. What is the corresponding Celsius scale temperature?

What is the name of the process due to which dry ice changes into carbon dioxide gas?

What are the conditions for 'something' to be called matter?

Which of the two diffuses faster: a liquid or a gas?

A piece of chalk can be broken into small particles by hammering but a piece of iron cannot be broken into small particles by hammering. Which characteristic of the particles of matter is illustrated by these observations?

What is meant by saying that the latent heat of vaporization of water is 22.5 × 10⁵J/ kg?

What are the characteristics of matter?

Arrange the following substances in increasing order of force of attraction between their particles (keeping the substance having them in imum force of attraction first):
Water, Sugar, Oxygen

What is the common name of solid carbon dioxide?

When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?

What do you understand by the term ‘latent heat’? What are the two types of latent heat?

Explain why:
Steel is used to make railway lines.

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?

Explain how, the smell of food being cooked in the kitchen reaches us even from a considerable distance.

Name the temperature at which:
A liquid changes into a gas.

What is the:
SI unit of temperature?

Explain why:
Air is used to inflate tyres.

What is the physical state of water:
at 0°C?

When a crystal of copper sulphate is placed at the bottom of a beaker containing water, the water slowly turns blue. Why?

Define matter. Give four examples of matter.

Which single term is used to describe the mixing of copper sulphate and water kept in a beaker, on its own?

What is the general name of:
Fluid forms of matter?

Define the following terms:
Boiling

Name the temperature at which:
A solid changes into a liquid.

‘A substance has a definite volume but no definite shape’. State whether this substance is a solid, a liquid or a gas.

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance quickly spreads in the entire room. Name the process involved in this.

Write the full forms of the following:
CNG

What is the general name of:
Rigid form of matter?

Name one common substance which can be easily changed from one state to another by heating or cooling.

Write the relation between Kelvin scale and Celsius scale of temperature.

A girl is cooking some food in the kitchen. The smell of food being cooked soon reaches her brother’s room. Explain how the smell could have reached her brother’s room.

Out of solids, liquids and gases, which one has:
Maximum movement of particles?

Explain why, the diffusion of a solid in another solid.

Bromine particles are almost twice as heavy as chlorine particles. Which gas will diffuse faster; bromine (vapour) or chorine? Explain your answer.

What should be added to a Celsius scale reading so as to obtain the corresponding Kelvin scale reading?

Explain why, when a bottle of perfume is opened in a room, we can smell it even from a considerable distance.

Write the full forms of the following:
LPG

In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

Out of solids, liquids and gases, which one has:
Minimum spaces between particles?

Out of solids, liquids and gases, which one has:
Maximum interparticle attractions?

Give the usual mane of the following:
Heat required to change the state of a substance without changing the temperature.

Name one property which is shown by ammonium chloride but not by sodium chloride.

What are the two ways in which the physical states of matter can be changed?

When sugar is dissolved in water, there is no increase in the volume. Which characteristic of matter is illustrated by this observation?