project in the tribune punjabi medium
Answers
Answer:
YOᑌ ᕼᗩᐯᗴ TᕼᗩᑎKՏ I ᑕᗩᑎ ᘜIᐯᗴ ᗷᑌY YOᑌ ᗩᒪՏO ᘜIᐯᗴ TᕼᗩᑎKՏ TO ᑕOᗰᑭᒪᗴTᗴ 1900
CLASS -9 (Chemistry assignment)-2
Topic – Is substance around us pure
1).You are provided with a solution of salt in water in one jar and mixture of
salt and sand in other. Can you state one property in which they resemble and
differ from one another.
2). Is alcohol is a mixture or a pure substance?
3). Do pure substances always have one phase?
4). Is mixture a pure substance?
5). Calculate the volume by volume percent solution formed by combining 18
ml of pure hydrogen peroxide with water to make 630 ml of solution.
6). If 7.5 ml of ethyl alcohol is dissolved in a water solution such that total
volume of solution is 450 ml, calculate the concentration of the ethyl alcohol
expressed as a volume percent?
7). Give any one point of difference between true solution, colloidal solution
and suspension
8). 20 g of sodium chloride is dissolved in 100 mL of water. How will you test
whether the given solution is saturated or unsaturated at the given
temperature?
9). Suggest any one method by which we can increase the solubility of
saturated solutions.
10). (a) List any three characteristic of colloid.
(b) Name the two components of a colloid.
(c) Identify colloid from the following mixtures:
Muddy water, sugar in water, ink, blood, soda water, foam
11). (a) Enumerate any two differences between simple distillation and
fractional distillation.
(b) Draw a labelled diagram showing the process of fractional distillation.
12). Which separation techniques will you apply for the separation of the
following (a) The different pigments from an extract of flower petals