- Before going to solve these, watch following videos:
Sorting Materials into Groups
Mixture
Separation of Substances
Assignment
- What is meant by a pure substance? Name two pure substances.
- What is a mixture? Give two examples of mixture.
- Does mixture have a fixed composition?
- Classify the following as homogeneos mixtures and heterogeneous mixture: sugar solution in water, air, soil, petrol, chalk and water mixture, sea water, biogas, coal.
- Mention two properties of heterogeneous mixtures.
- Mention three characteristics of mixture.
- How can the components of a mixture be separated?
- Name three mixtures found in nature.
- Which of the following are pure substances: iron, calcium, wood, air, ice, milk?
- Why is milk considered a mixture?
- Brass is an alloy which is considered a _____________ .
- What is the general name of the material which contain at least two pure ubstances and show the properties of both constituents?
- Which of the following is not a mixture
- Kerosene
- petrol
- air
- distilled water
- On the basis of composition of milk, it is considered to be a
- substance
- homogeneous mixture
- heterogeneous mixture
- compound