A

Question 1

absorb (in physics)

Answer 1

waves of light taken in by a material and not reflected

Question 2

abundance

Answer 2

how available a substnace is

Question 3

abuse

Answer 3

misuse of a drug

Question 4

acid

Answer 4

a compound containing hydrogen that can be replaced by a metal to form salt

Question 5

activation energy

Answer 5

the amount of energy that has to be available before a chemical reaction can take place

Question 6

aerobic respiration

Answer 6

respiration that uses oxygen

Question 7

air pressure

Answer 7

the force due to gases acting on an area

Question 8

alkali

Answer 8

soluble form of base

Question 9

alveoli

Answer 9

small air sacs in the lungs

Question 10

amplitude

Answer 10

the maximum displacement of a wave from zero

Question 11

anaemia

Answer 11

deficiency disease caused by a lack of iron

Question 12

anaerobic

Answer 12

respiration that does not use oxygen

Question 13

antagonistic muscle

Answer 13

two muscles that move a joint in different directions

Question 14

anther

Answer 14

male part of a flower that produces pollen

Question 15

antibiotic

Answer 15

a drug that kills some types of bacteria

Question 16

antibody

Answer 16

chemical produced by our body to destroy a microorganism

Question 17

anus

Answer 17

exit of the digestive system

Question 18

asthma

Answer 18

condition that makes breathing difficult

Question 19

atom

Answer 19

smallest component of an element that retains the element’s