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science chemistry > . > Flashcards

. Flashcards

1
Q

Soda-lime glass is made from

A
  • limestone
  • sand
  • sodium carbonate
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2
Q

Borosilicate glass is made from

A

Sand and boron trioxide

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3
Q

————- has a higher boiling point than soda-lime glass

A

Borosilicate glass

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4
Q

Bronze =

A

Copper + tin

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5
Q

Brass =

A

Copper + zinc

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6
Q

State the haber process equation.

A

N2 + 3H2 —> 2NH3

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7
Q

The air is —— % nitrogen.

A

78

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8
Q

What is the equation for ammonium nitrate

A

NH3 + HNO3 —> NH4NO3

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9
Q

You can react phosphate rock with

A
  • nitric acid
  • sulfuric acid
  • phosphoric acid
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10
Q

Reacting nitric acid and phosphate rock produces

A
  • phosphoric acid
  • calcium nitrate
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11
Q

Reacting sulfuric acid and phosphate rock produces

A
  • calcium sulfate
  • calcium phosphate ( this mixture is known as single superphosphate)
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12
Q

Reacting phosphoric acid and phosphate rock produces

A

Only Calcium phosphate
( this product can called triple superphosphate)

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13
Q

In the haber process the hydrogen mainly comes from …

A

Reacting methane with steam to form hydrogen and carbon dioxide

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14
Q

Sewage settles in a settlement tank and undergoes …

A

Sedimentation. This is when heavier rocks sink to the bottom to produce sludge at the top.

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15
Q

The ——— is removed from the settlement tank and treated by biological aerobic digestion. This is when air is pumped through the water to encourage the break down of organic matter.

A

effluent

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16
Q

The effluent is removed from the settlement tank and treated by ———-. This is when air is pumped through the water to encourage the break down of organic matter.

A

biological aerobic digestion

17
Q

The effluent is removed from the settlement tank and treated by biological aerobic digestion. This is when —————- . This then released back into the environment.

A

air is pumped through the water to encourage the break down of organic matter

18
Q

The sludge from the bottom of the settlement tank is removed and put into ———- for anaerobic digestion. This means that it is broken down by bacteria.

A

large tanks

19
Q

The sludge from the bottom of the settlement tank is removed and put into large tanks for ———- . This means that it is broken down by bacteria.

A

anaerobic digestion

20
Q

The sludge from the bottom of the settlement tank is removed and put into large tanks for anaerobic digestion. This means that …

A

it is broken down by bacteria

21
Q

Anaerobic digestion breaks down organic matter in the sludge , releasing methane gas. The mathane gas can be used as a …

A

energy source and the remaining digested waste can be used as a fertiliser.

22
Q

Anaerobic digestion breaks down ———- in the sludge , releasing methane gas. The mathane gas can be used as a energy source and the remaining digested waste can be used as a fertiliser.

A

organic matter

23
Q

Anaerobic digestion breaks down organic matter in the sludge , releasing ———-. The mathane gas can be used as a energy source and the remaining digested waste can be used as a fertiliser.

A

methane gas

24
Q

When calcium is reacted with sodium hydroxide, it produces …

A

A white precipitate

25
Q

When copper is reacted with sodium hydroxide, it produces …

A

A blue precipitate

26
Q

When iron (II) is reacted with sodium hydroxide, it produces …

A

Green precipitate

27
Q

When iron (III) is reacted with sodium hydroxide, it produces …

A

A brown precipitate

28
Q

When aluminium is reacted with sodium hydroxide, it produces …

A

White precipitate but redissolves in excess NaOH to form a colourless solution.

29
Q

When magnesium is reacted with sodium hydroxide, it produces …

A

White precipitate

30
Q

To test for sulfate ions :

A

Drop a couple drops of dilute hydrochloric acid following with a few drops of barium chloride solution. If the test is positive then a white precipitate should form.

science chemistry (18 decks)

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