SSC MTS EXAM

Detailed explanation-1: -Heating a liquid increases the speed of the molecules. An increase in the speed of the molecules competes with the attraction between molecules and causes molecules to move a little further apart. Cooling a liquid decreases the speed of the molecules.

Detailed explanation-2: -VAPORIZATION When water reaches its boiling point of 100ºC, water molecules are moving so fast that they break free of the attractions that hold them together in the liquid state. The result is vaporization-the liquid be-comes a gas.

Detailed explanation-3: -Adding heat energy causes molecules to move more quickly. Adding heat energy to most liquids and gases causes them to expand (become less dense). Adding heat energy can change the state of a gas, liquid, or solid.

Detailed explanation-4: -When an object is heated the heat energy given excites the molecule and hence increases its kinetic energy because of which molecules start moving faster and its velocity is known as root mean square (RMS) velocity of molecule.