Chemistry random stuff

Question 1

Test for chlorine gas

Answer 1

bleaches damp red litmus paper

Question 2

Test for ammonia gas

Answer 2

turns damp red litmus paper blue

Question 3

flame test lithium ion

Answer 3

red flame

Question 4

flame test sodium ion

Answer 4

yellow flame

Question 5

flame test potassium ion

Answer 5

lilac flame

Question 6

flame test calcium ion

Answer 6

orangey red flame

Question 7

flame test copper(2) ion

Answer 7

bluey green flame

Question 8

test for copper(3) ion

Answer 8

blue precipitate (copper sulfate and sodium hydroxide)

Question 9

test for iron(3) ion

Answer 9

brown precipitate (iron chloride and sodium hydroxide)

Question 10

test for iron(2) ion

Answer 10

green precipitate (iron sulfate and sodium hydroxide)

Question 11

test for carbonates

Answer 11

CO2 bubbles formed (tested with limewater) when adding dilute HCL

Question 12

test for sulfates

Answer 12

add HCL and barium chloride - forms white precipitate

Question 13

tests for chlorides, bromides, iodides

Answer 13

add nitric acid then silver nitrate - chloride forms white precipitate, bromide forms a cream precipitate, iodide forms yellow precipitate

Question 14

increased pressure effect on equilibrium

Answer 14

position of equilibrium shifts to side with fewer (gas) molecules

Question 15

increased temperature effect on equilibrium

Answer 15

position of equilibrium shifts to the endothermic reaction (as if it is to balance out the temperature)

Question 16

increased concentration (of reactants) effect on equilibrium

Answer 16

position of equilibrium shifts to produce more products

Question 17

if △heat is negative…

Answer 17

forward reaction is exothermic

Question 18

atom economy equation

Answer 18

RFM of wanted product / RFM of all reactants

Question 19

concentration equation

Answer 19

mass or moles = concentration (g/dm^3) x volume (dm^3)

Question 20

which chlorides arent soluble

Answer 20

silver and lead

Question 21

which sulphates arent soluble

Answer 21

barium, calcium and lead

Question 22

which compounds are always soluble

Answer 22

pottasium, ammonium and sodium