Stuff I forget

Question 1

e

Question 2

What are the properties of IONIC COMPOUNDS?

Answer 2

• Conducts electricity ( Only in liquid, ions can move around)
• High melting points and boiling points (strong ELECTROSTATIC force of attraction between oppositely charged ions)

Question 3

How do metallic bonds form?

Answer 3

due to electrostatic attraction between the positively charged metal ions and the negatively charged delocalised electrons

Question 4

Why are some metals more reactive than others?

Answer 4

• greater distance between the positive nucleus and outer electron
• outer electron more weakly held

Question 5

How can we show that SULPHURIC ACID is a dehydrating agent?

Answer 5

• By reacting it with Sugar and Hydrated Copper (II) Sulfate

Question 6

How do we Identify Ammonium Ions (NH4)

Answer 6

• By adding dilute SODIUM HYDROXIDE and gently heating

- If Ammonia is present it will turn Red Litmus paper into Blue

Question 7

Why are catalyst used during the HABER PROCESS?

Answer 7

Reduce the time taken to reach equilibrium

Question 8

What are the conditions used in STAGE 2 of contact process?

Answer 8

Vanadium oxide
Atmospheric Pressure
450 degrees Celsius

Question 9

How do you test for sulphate ions ( SO4 2‒)

Answer 9

• By adding Barium Chloride

- A white precipitate of barium sulphate forms if sulphate ions are present

Question 10

solid

Answer 10

mass = moles x mr

Question 11

liquid

Answer 11

moles= conc x vol/1000

Question 12

What unit do you use for concentration?

Answer 12

Mol dm-3

Question 13

What is Iron ore used for in a blast furnace?

Answer 13

Source of iron

Question 14

What is Coke used for in a blast furnace?

Answer 14

as a fuel and to produce carbon monoxide for the reduction

Question 15

What is Limestone used for in a blast furnace?

Answer 15

to remove impurities

Question 16

What is hot air used in blast furnace?

Answer 16

provides oxygen so that coke can burn

Question 17

What is electrolysis?

Answer 17

The process by which ionic substances are decomposed into simpler substances when an electric current is passed through them

Question 18

When COPPER (CU) is present and reacts with HYDROXIDE (OH) what colour does it make?

Answer 18

blue precipitate

Question 19

If IRON (FE3+) is present and reacts with HYDROXIDE (OH) what colour does it make?

Answer 19

Brown precipitate

Question 20

IF IRON (FE2+) is present and reacts with HYDROXIDE (OH) what colour does it make?

Answer 20

green precipitate

Question 21

What is the reaction for CARBON MONOXIDE in a blast furnace?

Answer 21

Oxygen from the hot air reacts with carbon (coke) to form carbon monoxide.
This is an exothermic reaction and heats the furnace.
2C + O2 → 2CO

Question 22

What is the reaction for IRON in the blast furnace?

Answer 22

Carbon monoxide then reacts with iron(III) oxide to give iron and carbon dioxide
Fe2O3 + 3CO → 2Fe + 3CO2

Question 23

What is the reaction for CALCIUM OXIDE in a BLAST FURNACE?

Answer 23

Limestone decomposes thermally to form calcium oxide + Carbon Dioxide
CaCO3 → CaO + CO2

Question 24

What is the reaction for SLAG in a BLAST FURNACE?

Answer 24

Calcium reacts with silicon dioxide (sand) to form slag.

CaO + SiO2 → CaSiO3

Question 25

When in ionic solutions , when is hydrogen formed at the CATHODE?

Answer 25

If the metal is more reactive than hydrogen

Question 26

What is less reactive than hydrogen?

Answer 26

• copper
• silver
• gold

Question 27

What is room temp?

Answer 27

21.5 celsius