Matter CHEMISTRY - Matter

State if the following is a physical property of a substance.
Sulphur is a yellow amorphous powder insoluble in water.

State if the following is a physical property of a substance.
Hydrogen sulphide gas has a strong rotten egg odour.

State if the following is a physical property of a substance.
Naphthalene on heating directly turns into vapour.

State if the following is a physical property of a substance.
Water acidified with dilute sulphuric acid is a good conductor of electricity.

State if the following is a physical property of a substance.
Lead chloride reacts with barium sulphate to give a white precipitate of lead sulphate.

Ice on absorption of heat converts to ‘X’ a process called ____ [vaporization / melting]. ‘X’ changes to water vapour on ____ [heating / cooling]. Water vapour changes back to ‘X’ on ____ [freezing / condensation]. The constant temperature at which ice changes into ‘X’ is called its ____ [fusion point / melting point / boiling point].

Why does a candle become smaller on burning with time?

Water cycle is an example of interconversion of states of water. Explain

How does a liquid changes into its gaseous state? Explain

Give reasons:
How is interconversion of states of matter different from chemical reaction?

Give reasons:
Why a solid does not flow, but a liquid flows?

Name the three states of matter and define them

Describe simple experiments to prove that gases have no definite volume or shape.

Describe simple experiments to prove that gases have mass.

Describe simple experiments to prove that gases occupy space.

To identify materials of common use
Procedure – Just move around in your house – in the drawing room, sitting room, bedroom, kitchen, bathroom etc. Identify the things and All in the blanks in the table given below

No.	Place	Name of the thing	Material used for making the thing
1	Study room
2	Drawing room
3	Kitchen
4	bathroom
5	Any other place

Fill the following chart showing twelve solids, twelve liquids, four gases and eight materials.

What happens to a metal ball when it is heated? What does this show?

State what would you observe if
(a) sugar is added to pebbles take in a plastic beaker
(b) sand is added to glass balls in a beaker. What would you conclude from this imaginative demonstration?

Explain the term ‘Interconversion of matter’. With reference to ice, water, and water vapour show diagrammatically the change of state of matter from solid to liquid to gaseous and back to the original state.

Think and try to find a way to demonstrate water cycle in class

Give two examples of the following:
Substances which are rigid and not compressible

Give two examples of the following:
Substances which do not change their states.

Give two examples of the following:
Substances which sublime.

Name the phenomenon which causes the following changes:
Conversion of water into steam

Intermingling of molecules is called ____

The space between atoms’ [molecules] of solids is ____

Matter can change from one state to another by the change in ____

Cohesive forces are negligible in ____

Brownian movement is maximum in ____.

A gas has no free surface.

The intermolecular force of attraction is the weakest in gases.

All solids, on heating, first change to the liquid and then to the gaseous state always

There is no difference between evaporation and boiling

Solids have the larger inter-molecular space