1.1 States of Matter

Question 1

matter

Answer 1

Anything that occupies space and has mass

Question 2

states of matter

Answer 2

solid, liquid and gas are the three states of matter in which any substance can exist, depending on the conditions of temperature and pressure

Question 3

fluid

Answer 3

a gas or a liquid; they are able to flow

Question 4

melting point (m.p)

Answer 4

the temperature at which a solid turn into a liquid - it has the same value as the freezing point; a pure substance has a sharp melting point

Question 5

evaporation

Answer 5

a process occurring at the surface of a liquid into vapour at a temperature below the boiling point.

Question 6

boiling

Answer 6

the process of change from liquid to gas at the boiling point of the substance; a condition under which gas bubbles are able to form within a liquid-gas molecules escape from the body of a liquid, not just from its surface

Question 7

boiling point

Answer 7

the temperature at which a liquid boils, when the pressure of the gas created above the liquid equals atmospheric pressure

Question 8

volatile

Answer 8

term that describes a liquid that evaporates easily; it ia s liquid with low boiling point because there are only weak intermolecular forces between the molecules in the liquid

Question 9

volatility

Answer 9

the property of how easily a liquid evaporates

Question 10

condensation

Answer 10

the change of a vapour or a gas into a liquid; during this process heat

Question 11

pure substance

Answer 11

a single chemical element or compound - it melts and boild

Question 12

lattice

Answer 12

a regular three -dimensional arrangement of atoms, molecules or ions in a crystalline solid