1.2 Kinetic particle theory of matter

Question 1

atom

Answer 1

the smallest particle of an element5 that can take part in a chemical reaction

Question 2

kinetic particle theory

Answer 2

a theory which accounts for the bulk properties of the different states of matter in terms of the movement of particles (atoms or molecules) - the theory explains what happens during changes in physical state

Question 3

molecule

Answer 3

a group of atoms held together by covalent bonds

Question 4

intermolecular space

Answer 4

the space between atoms or molecules in a liquid or gas. The intermolecular space is small in a liquid, but relatively very large in a gas.

Question 5

intermolecular forces

Answer 5

the weak attractive forces that act between molecules

Question 6

exothermic changes

Answer 6

a process or chemical reaction in which heat energy is produced and releases to the surroundings
ΔH for an exothermic change has a negative value

Question 7

endothermic changes

Answer 7

a process or chemical reaction that takes in heat from the surroundings
ΔH for endothermic change has a positive value