Download moodle unit 2

MOODLE UNIT 2
A. Match the words below with the best description.
electron, proton, neutron, nucleon, orbit, orbital, nucleus,
1.
2.
3.
4.
A positively charge sub atomic particle. proton
A negatively charged sub atomic particle. electron
An uncharged sub atomic particle. neutron
The central part of an atom which contains one or more protons and
perhaps some neutrons as well. nucleus
5. A proton or neutron. nucleon
6. A classical closed path trajectory used to describe the path of a planet or
comet around the sun. orbit
7. A quantum mechanical concept attempting to describe the motion of a
sub atomic negative particle around a positively charged particle. orbital
B. Match the words to the best definition.
minute, density, pressure, mercury, metal, non-metal
1. Generally a material which conducts heat and electricity well and has
a high melting point. metal
2. The amount of mass in a given volume. density
3. Very small. minute
4. Generally a material with poor conductivity, brittle and has a low
melting point. Non-metal
5. An unusual metal because it is liquid at room temperature and
atmospheric pressure. mercury
6. The force per unit area. pressure
C. Complete the following definitions and sentences using the appropriate
word from the list below
equipment, part, weight, radiation, hardness, pressure, reaction, person
1. Tungsten is a metal which retains its hardness at red heat.
2. Radiation can be used for sterilizing medical equipment.
3. A catalyst is a substance which speeds up a chemical reaction without
changing itself.
4. An atom is the smallest part which can take place in a chemical reaction.
5. A barometer is an instrument which measures atmospheric pressure.
6. A geiger counter is an instrument for measuring ionizing radiation.
7. A person who studies living organisms is called a biologist.
8. Aluminum is a metal that is light in weight.
D. Make the words opposite by adding the correct negative prefix (un-, ir-,
il-, im-, dis-, in).
1. uncertain
2. improbable
3. unreasonable
4. irrational
5. illogical
6. inaccurate
7. disobedient
8. immeasureable
9. unnatural
(maximum 30 marks)