Recheck the heating curve shows the energy gain of a substance as it changes from solid to gas. which section of the graph shows the liquid phase of the substance gaining kinetic energy?

- c) C.

Explanations:- Looking at the heating curve, the solid temperature is below zero degree C. in section A, the solid is gaining energy and changing to higher energy solid. The solid changes into liquid in section B as there is no change in temperature for this section and all the energy is used in melting.

In section C, the liquid is gaining kinetic energy and changing to higher degree temperature liquid. It continues till 100 degree C. At 100 degree C, the liquid starts changing into the gas of same temperature(100 degree C) and it's known as vaporization. When all the liquid is changed to gas and further heat is added then the gas starts gaining kinetic energy and changes to higher degree temperature gas.

So, the right choice is c) the liquid phase of the substance gaining kinetic energy in section C.

(2) - 599 atm

Solution:- At constant temperature, "Volume of the gas is inversely proportional to the pressure."  This is Boyle's law.

The formula for this law is:

From given data, = 105 kpa

= 2.031 L

= 0.356 L

= ?

We need to calculate the final pressure so let's rearrange the equation for this:

Let's plug in the values and do the calculations:

= 599 atm

As per the sig figs rule, in multiply and division, we go with least number of sig figs, here for the given numbers the least sig figs are three for the initial pressure and final volume. So, the final pressure must be reported with three sig figs and hence 599 atm is the right answer.