P4

Question 1

ion

Answer 1

charged particle formed when electrons are lost or gained

Question 2

isotope

Answer 2

atoms with same number of protons but different number of neutrons

Question 3

alpha radiation

Answer 3

• 2 protons 2 neutrons
• 4/2 He nucleus
• most ionising, least penetrating
• travel cm in air, stopped by paper

Question 4

beta radiation

Answer 4

-fast moving electron
- e 0/-1
- travel m in air, stopped by aluminium

Question 5

gamma radiation

Answer 5

• electromagnetic radiation from nucleus
• least ionising, most penetrating
• travel km in air, stopped by thick lead

Question 6

contamination

Answer 6

unwanted presence if radioactive atoms

Question 7

contamination protection

Answer 7

wear gloves, use tongs

Question 8

irradiation

Answer 8

exposed to radiation
- not radioactive

Question 9

irradiation protection

Answer 9

wear lead apron, step away from radiation

Question 10

radioactive decay is…

Answer 10

random

Question 11

half life

Answer 11

time taken for half the number of radioactive nuclei to decay

Question 12

jj thomson

Answer 12

plum pudding

Question 13

rutherford

Answer 13

nuclear model

Question 14

niels bohr

Answer 14

electron shells

Question 15

james chadwick

Answer 15

neutron

Question 16

aerobic respiration

Answer 16

uses oxygen to produce energy from food

Question 17

anaerobic respiration

Answer 17

produces energy in cells without oxygen