Question

Collect some solid materials such as
ghee, wax, sand, sugar, salt, turmeric
powder, dal, plastic, wood, iron nails.
Take a bucketful of water and a beaker.
Now try to discover the following.
Which materials float on water?
Which materials sink in water?
Which materials are soluble in water?
Which materials are not soluble in water?​

Answer 1

Answer:

1. Materials which float on water are: ghee, wax, plastic, wood

2. Materials which sink in water are: sand, dal, iron nail

3. Materials which are soluble in water are: sugar, salt, turmeric powder,

4. Materials which are not soluble in water are: sand, oil, wax

Explanation:

• Materials which float on water are as follows:

             1. Ghee

             2. Wax

             3. Plastic

             4. Wood

These materials float on water because the density of the water is greater than the density of the substance or the  element, so, the substance or element will float on the water and the element will experience buoyancy while floating on the water's surface.

• Materials which sink in water are:

             1. Sand

            2. Dal

            3. Iron nail

These materials sink in water because they are more dense than water, so, they will sink when placed in water. Density is a characteristic property of a material and doesn't depend on the amount of material.

• Materials which are soluble in water are:

                     1. Sugar

                     2. Salt

                     3. Turmeric powder

These materials are soluble in water because of their polarity and ability to form hydrogen bonds, water makes an excellent solvent, meaning that it can dissolve many different kinds of molecules.

• Materials which are not soluble in water are:

                      1. Sand

                     2. Oil

                     3. Wax

These materials are soluble in water because of they are non-polar and do not interact well with water molecules.

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