Science revision

Question 1

validity

Answer 1

how accurate a moethod and measurement is

Question 2

reliability

Answer 2

a repeated measurement with similar answers each time

Question 3

molecule

Answer 3

two or more atoms connected by chemical bonds

Question 4

flocculation

Answer 4

a process where chemical coagulants are added to water to facilitate bonding between particles

Question 5

filtration

Answer 5

a process used to seperate solids from liquids

Question 6

coagulation

Answer 6

when a proteins structure is changed by heat

Question 7

sedimentation

Answer 7

when solids sink to the bottom of a liquid

Question 8

solute

Answer 8

something you dissolve with a solvent

Question 9

solvent

Answer 9

something you use to dissolve a solute

Question 10

solution

Answer 10

the mixture of a solvent and a solute

Question 11

endothermic

Answer 11

a reaction that absorbs heat and energy

Question 12

exothermic

Answer 12

a reaction that lets out heat and energy

Question 13

combustion

Answer 13

when substances react with oxygen quickly and gives off heat

Question 14

precipitation

Answer 14

when water rains from clouds