Kinetic Particle Model Of Matter

Question 1

Define a molecule

Answer 1

A molecule is a particle made up of two or more bonded atoms

Question 2

Def an ion

Answer 2

It is a charged particle formed from an atom or group of atoms

Question 3

Define an atom

Answer 3

It is the smallest particle that can participate in an ordinary chemical reaction

Question 4

Define density

Answer 4

It is the ratio of mass to volume

Question 5

Name the different phase changes

Answer 5

Melting or fusion

Solidification

Vaporisation

Condensation

Evaporation

Boiling

Question 6

Name 3 differences between boiling and evaporation

Answer 6

Boiling. Evaporation

1. Only at one temp. At all temps
2. Throughout liquid. Only at the surface
3. Rate depends on rate of supply of heat
   Depends on temp, humidity, surface area, air movement above surface

Question 7

What is the formula used when pressure /volume of gasses are studied

Answer 7

P1 V1= P2 V2

Question 8

Define brownian movement

Answer 8

It is the haphazard movement of small particles which is caused by gas molecules colliding with the particles

Question 9

Def diffusion

Answer 9

It is the spontaneous mixing of the particles of different substances until the concentrations of the substances are the same throughout the container

Question 10

What experiment will you use to demonstrate diffusion

Answer 10

NH3 (gas). + HCl (gas). Both colourless

–>. NH4Cl

Ring forms nearer HCl. (Heavier and diffuses slower)