847 cal =  ___ kcal

625 cal = ____ J

Energy is the ability to do work which is measured in different units. Calorie and Joule are the units of energy which are proportionate to each other. This implies any change in the value of calories will change its equivalent value in joules. The relation between calorie and joule can be numerically written as : 1 calorie = 4.2 joules approx.
Hence, 625 cal= (625* 4.2)= 2,615 joules.

25 kcal = ____cal

The kilo calorie is a measurement unit of energy. The symbol of kilo calorie is kcal.The kilocalorie is used in measuring the heating, calorific value or metabolizing foods. It equals to 1000 calories, or approximately 4.2 kilojoules. Therefore, 1 kcal= 1000 cal.
so, 25 kcal= (25*1000)= 25000 cal.

When sufficient heat is supplied to an ice cube

When heat is applied to an ice molecule, the solid phase changes to the liquid phase and thus the ice is melted into water after applying heat. Heating a substance makes the molecules move faster and thus the heat energy breaks the hydrogen bonds that hold the molecules in the ice together thus resulting in melting of ice.

Match the following:

	State		Flow of heat
a		i	To the hand
b		ii	From the hand
c		iii	None

In which of the following states the potential energy is the lowest?

The molecules of which form of water have the lowest kinetic energy?

The heat energy flows from a _____ to _____ body.

A pot of water is freezed, what happens at a molecular level?

87 kcal = ____ cal

8373 J = ____ cal

2622 cal =  ___ kcal

385 cal =___ J

In which of the following states the potential energy is the highest?

How do we know that a substance has changed state from solid to liquid at a molecular level?

Match the following:

State	Attributes
a. Solid	i. Highest kinetic energy of the molecules
b. Liquid	ii. Highest potential energy of the molecules
c. Gas	iii. Moderate K E and P E