Answer to Question #93735 in Molecular Physics | Thermodynamics for Faris Halim

Question

As a block of ice is melted (to 4 °C). Its volume.
Option A. remains the same.
Option B. decreases.
Option C. increases.


Which one is true

Answer 1

It's volume decreases.

Density of is is less than it is of water:

$d(ice)≈0.916\frac{g}{cm^3}$

Water has maximum density at $4°C$

$d(water)= 1\frac{g}{cm^3}$

If we have 1 g of ice its volume is

$V(ice)=\frac{m}{d}= \frac{1}{0.916}=1.092 cm^3$

Volume of 1 g of melted ice is volume of water

$V(water)= \frac{1}{1}=1 cm^3$

So, we see that when ice is melted to water at 4^oC density decreases.