Question

51. x' grams of solid wax on melting will form_____
liquid wax.
(a) 2x g (b) 4x g (c) 10 x g.
(d) xg

Answer 1

Answer:

Given mass of wax in air = x

Also, mass of metal in water = y

And, mass of wax and metal in water = z

Hence, mass of wax in water = z-y

We can consider, mass of wax in water = mass of wax in air - upthrust due to water

Upthrust = specific gravity of water × volume of wax

Upthrust = x - (z - y)

But specific gravity of water is 1, so Upthrust is effectively volume of wax

Mass of wax = x

Hence, specific gravity of wax =

x−(z−y)

x

Answer 2

Answer:

I hope it will help you if you like this mark brainlest

Explanation:

No new substances are formed. In a burning candle, there are both physical and chemical changes. The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes. The burning of the wax vapour is a chemical change.