Concept 2.1

Choose the Correct answer:- Temperature it the measure of -------------- energy of molecules of a subctance. ( a, Potential b. Kinetic c. Light d. Chemical_

Put true or false (3) During Process (A), the molecules absorb thermal energy and move faster.

Choose the Correct answer:- Water molecules have the lowest kinetic energy when it is in the form of ----------- ( a. water vapor b. water drops c, steam d. ice)

Choose the Correct answer Both --------- and ----------- are example of liquid matter. ( A. water - milk b. Water - Wood c. Water - Copper d. oil - paper)

Put True or Wrong:- Gases have variable shape and volume.

Put true or false (1) Process (B) is called evaporation, while process (C) is called freezing

Put right or Wrong:- a space between molecules of a substance increases by decreasing the temperature of this object

Write the scientific term :- The decrease in the volume of material as its temperature decreases.

Choose the Correct answer: - When the temperature of a rod of iron is increased, ------------------ ( a. its length increase b. its length decreases to its half c. its length doesn't change d. its length decreases to its quarter

What happen when you touch a hot cup of tea

Put true or false (4) During process (D) the force holds the molecules together decreases so, they vibrate slowly.

Write the scientific term :- The smallest building unit of matter

Put true or false (2) Water can changed from state (2) to state (3) by cooling , while it can be changed from state (2) to state(1) by heating

Write the scientific term :- it's the change of the matter from liquid state to solid state

Write the scientific term :- A process in which liquid molecules move faster and change to another state

Put True or Wrong:- Railroads tracks are made up of iron

Put True or Wrong:- The melting point and boiling point of substance are considered as a physical properties of this substance

Give reason :- level of alcohol inside the thermometer rises up if we put it inside hot water