Whole Course & Chemical Analysis

Question 1

hydrogen

Answer 1

a gas which burns with a squeaky pop

Question 2

oxygen

Answer 2

a gas which relights a glowing splint

Question 3

carbon dioxide

Answer 3

a bas which, when bubbled through lime water, turns it cloudy/chalky/milky.

Question 4

ammonia

Answer 4

a gas which turns moist pH paper blue

Question 5

evaporation

Answer 5

a technique used to separate soluble salt from solutions

Question 6

flame test

Answer 6

a technique used to identify the presence of metal ions by colour

Question 7

water bath

Answer 7

a a safe heating methods used when the reactants/products in a reaction are flammable

Question 8

filtration

Answer 8

a technique used to separate a solid from a solution

Question 9

precipitation reaction

Answer 9

hen two solutions are mixed and an insoluble solid is formed

Question 10

distillation

Answer 10

separates mixtures of liquids with different boiling points

Question 11

concordant results

Answer 11

results within 0.2cm3 of each other (i.e. close enough to be used in calculating an average)

Question 12

standard solution

Answer 12

a solution of accurately known concentration

Question 13

mole

Answer 13

the relative atomic/formula mass of an substance expressed in grams

Question 14

molten

Answer 14

describes a liquid formed by melting a solid

Question 15

pipette

Answer 15

apparatus used to measure a specific volume of liquid or solution

Question 16

titration

Answer 16

technique used to accurately measure the volume of liquid or solution required for a particular reaction

Question 17

variable

Answer 17

a factor that can be changed in a chemical reaction

Question 18

burette

Answer 18

graduated piece of apparatus used to measure accurately the volume of liquid or solution dispensed during an experiment

Question 19

reliability

Answer 19

the consistancy of results within a test. is increased by repeating results.

Question 20

accuracy

Answer 20

the degree to which a measurement is true / correct