Short answer

1. Define the following terms Element, compound, symbol, formula
2. Give two points to show the difference between solids, liquids and gases.
3. Give three points of distinction between a compound and a mixture.
4. Give symbols of any five elements which start with a letter ’{C}’.
5. Arrange the following substances in the increasing order of forces of attraction between the particles.Water, Sugar ,Oxygen
6. Classify the following into elements, compounds and mixtures.air, milk, water, sugar, diamond , phosphorus
7. Classify the following substances into homogeneous and heterogeneous mixtures. soda water, wood, air, soil, vinegar
8. MCO₃ is the formula of carbonate of a metal. What will be the formula of chloride and phosphate of the metal ?

Long answer type

1. What is the effect of temperature and pressure on three states of matter ?
2. Give the characteristics of mixtures and compounds.
3. Illustrate by an experiment the difference between a compound and a mixture.
4. How will you write a formula of a compound with the help of symbols and valencies of elements ? Illustrate with suitable example.

Give reasons for the following

1. One can get a smell of perfume even from a distance.
2. Gases do not have definite shape and volume.
3. Liquids have definite volume but not a definite shape.
4. Solids, generally have high density.
5. Gases exert pressure.