Can water cause molecules in a piece of chalk to break apart how can you say this

Why do we need to classify the objects?

Define density. How is it related to floating and sinking in water?

 Hots Questions: Think and answer :

1) You want to take a tumbler to a picnic. You want to crush and throw away the tumbler after use. Name two materials from which such a tumbler can be made.

2) Can water cause molecules in piece of chalk to break apart? How can you say this?

3) Which has greater density-ice or water? How can you say this?

4) Two molecules of a solid are kept some distance apart and the force between them is measured. The solid is then melted to form a liquid. Two molecules of the liquid are now kept the same distance apart and the force between them is measured. Which force will be greater? Explain why.

 some examples of lustrous material?

are human beings opaque or translucent?

If there are opaque, why does the torch light pass through our palm when we cover the glass of a torch?

how can wood float in water i think it's heavyer than water is it hollow??

differenciate between hard and soft material

why is diamond non metal?