periodicity + reactivity

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

carbonate test

Back (Answer)

react with acid to form CO2 gas - add nitric acid and bubble gas through limewater

Front (Question)

sulfate test

Back (Answer)

barium sulfate = insoluble barium chloride/nitrate added - white ppt = positive

Front (Question)

which substance should you use in the sulphate test if you want to do the halide test after it?

Back (Answer)

barium nitrate

Front (Question)

basis for halide test

Back (Answer)

silver halides are insoluble

Front (Question)

halide test

Back (Answer)

• add silver nitrate to aqueous halide solution • ppt = positive • add aqueous ammonia to test solubility to tell colours apart

Front (Question)

colour of chloride ppt

Back (Answer)

white

Front (Question)

solubility of chloride ppt in NH3

Back (Answer)

soluble in DILUTE

Front (Question)

colour of bromide ppt

Back (Answer)

cream

Front (Question)

colour of iodide ppt

Back (Answer)

yellow

#10

Front (Question)

solubility of bromide ppt in NH3

Back (Answer)

soluble in CONCENTRATED

#11

Front (Question)

solubility of iodide ppt in NH3

Back (Answer)

insoluble in CONCENTRATED

#12

Front (Question)

sequence of qualitative analysis tests

Back (Answer)

1) Carbonate 2) Sulfate 3) Halide

#13

Front (Question)

test for ammonium ion

Back (Answer)

• NaOH added to solution • ammonia gas produced (v soluble In water) • mixture warmed and gas released • test pH with moist pH paper - turn BLUE

#14

Front (Question)

can ammonium nitrate conduct electricity?

Back (Answer)

yes

#15

Front (Question)

benefits of using chlorine in water purification

Back (Answer)

• kills bateria

#16

Front (Question)

disadvantages of using chlorine in water purification (3)

Back (Answer)

• chlorine is toxic • is respiratory irritant • can react with hydrocarbons forming chlorinated hydrocarbons - cause cancer

#17

Front (Question)

why do halogen boiling points increase down the group [3]

Back (Answer)

• London forces (dipole-dipole interactions increase) • because number of electrons increase • therefore more energy to break intermolecular forces

#18

Front (Question)

why is it important that a colorimeter is calibrated before use? how would you calibrate it [3]

Back (Answer)

• to provide reference values • record values given by colorimeter for known concentrations • plot graph so unknown concentrations can be worked out from a given reading from colorimeter

#19

Front (Question)

melting point trend across p 2+3 – why?

Back (Answer)

increase between 1 and 4 decreases 4-5 low from 5-0 – because change from giant to simple molecular structures

#20

Front (Question)

group 2 elements act as

Back (Answer)

REDUCING AGENTS

#21

Front (Question)

solubility of group 2 oxides down the group - pH?

Back (Answer)

increases, increases - alkalinity increases

#22

Front (Question)

uses of group 2 compounds as bases

Back (Answer)

• Ca(OH)2 added to field to raise soil pH - antacids

#23

Front (Question)

boiling point trends down halogens - why?

Back (Answer)

INCREASES - more electrons, more London forces, more energy required to break bonds

#24

Front (Question)

benefits of chlorine in water treatment (1)

Back (Answer)

kills bacteria