Question

1 What is meant by a pure substance? Name two pure substances
2 What is a mixture? Give two examples of mixtures.
3 Does a mixture have a fixed composition?
Classify the following as homogeneous mixtures and heterogeneous mixtures
SUgar solution in water, Air, Soil, Petrol, Chalk and water mixture, Sea water, Biogas, Coal
5. Mention two properties of heterogeneous mixtures
6. Mention three characteristics of a mixture
7. How can the components of a mixture be separated?
8. Name three mixtures found in nature
9 Which of the following are pure substances?
Iron, Calcium, Wood, Air, lce, Milk
10 Why is milk considered a mixture?
11 Brass is an alloy which is considered a
12. What is the general name of the material which contain at least two pure substances and show the properties of both
constituents?

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Answer 1

Answer:

1. A pure substance has a constant composition and cannot be separated into simpler substances by physical means. There are two types of pure substances: elements and compounds.

2.mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs. ... Some examples of mixtures are a tossed salad, salt water

Answer 2

Explanation:

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3.no

4.it don't have fixed composition

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