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=In text questions page number 15

=In text questions page number 18

=In text questions page number 24

=In text questions page number 24

 

In text questions page number 15

In text questions page number 15

1. What is meant by a pure substance?
Answer:
A pure substance consists of single type of particles that is all the constituent particles of a pure substance have same chemical nature. For example all elements and compounds (Na, NaCl etc) are substance.

2. List the points of differences between homogeneous and heterogeneous mixtures.
Answer:

Homogeneous Mixtures Heterogeneous Mixtures
1. Homogeneous mixtures have uniform composition. 1. Heterogeneous mixtures have non uniform composition
2. It has no visible boundaries of separation between its constituents. 2. It has visible boundaries of separation between its constituents.
3. Some examples of homogeneous mixtures are: salt in water, sugar in water. 3. Some examples of heterogeneous mixtures are: water and sand, oil and water.

 



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In text questions page number 15

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