Question

Think critically
1. Is sand and sugar together a mixture or compound? give reasons.
2. why is air regarded as a mixture?
3. why does visibility increase after rainfall?
4. suspended impurities in water Sink to bottom on adding alum. give give reason​

Answer 1

Answer:

Sand is a mixture and sugar is a compound

Explanation:

1-Sand is a heterogeneous mixture because it does not have same properties,composition and appearance throughout the mixture.The main component of sand is Sio2

Sugar is a compound. It is a chemical combination of hydrogen,oxygen and carbon

2-

Answer 2

1)sand and sugar is a mixture because they are not chemically bounded together and they show their property of their constituents.

2)air is regarded as a mixture because the constituents of air such as hydrogen, oxygen and helium etc can be separated by using fractional distillation process. and the gases are showing their own constituent property.

4)suspended impurities sink at the bottom after using alum because when alum is added in the water carrying tiny particles of impurities then the particles

become heavy and large and automatically goes down at the bottom.

sorry I can't answer the 3 number