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Chemistry Aliyya > Gas chemistry test > Flashcards

Gas chemistry test Flashcards

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1
Q

What 3 ways can oxidation be defined as?

A
  • Gain of oxygen
  • Loss of hydrogen
  • Loss of electrons
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2
Q

What 3 ways can reduction be defined?

A
  • Loss of oxygen
  • Gain of hydrogen
  • Gain of electrons
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3
Q

What type of reaction is the extraction of aluminium?

A
  • A redox reaction
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4
Q

What is a positive electrode called?

A

Anode

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5
Q

What is a negative electrode called?

A

Cathode

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6
Q

What is the gas test for carbon dioxide?

A

CO2 is bubbled through limewater which turns the colourless solution milky. (White precipitate formed)

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7
Q

CO2 + Ca(OH)2 =

A

CaCO3+H2O

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8
Q

What happens to the white precipitate after it is formed?

A

It then dissolves to form a colourless solution

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9
Q

CaCO3+CO2+H2O=

A

Ca(HCO3)2

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10
Q

What does carbon dioxide form when it reacts with water?

A

-Forms a weak acid, carbonic acid

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11
Q

CO2+H2O=

A

H2CO3

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12
Q

What are 4 physical properties of oxygen?

A
  • Colourless, odourless gas
  • Slightly soluble in water
  • Slightly denser than air
  • Diatomic O2
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13
Q

How is oxygen made?

A

Using hydrogen peroxide and manganese(IV) oxide. Manganese(IV) oxide is a catalyst which is used to speed up the decomposition of hydrogen peroxide

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14
Q

2H2O2(Hydrogen peroxide+ Manganese(IV)oxide=

A

2H20+O2

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15
Q

What is the test for oxygen?

A

Glowing splint relights in the presence of oxygen

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16
Q

What is electrolysis?

A

The decomposition of a liquid electrolyte using a direct current of electricity

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17
Q

What is the electrolyte?

A

The liquid or solution that conducts electricity and is decomposed by it

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18
Q

How can you test if a liquid conducts electricity?

A

Two graphite rods are placed in a liquid and connected externally to a power supply such as a battery or a power bank

19
Q

If a liquid conducts electricity and is decomposed by it what takes place?

A

Electrolysis

20
Q

What are cations?

A

Positive ions

21
Q

What are negative ions called?

A

Anions

22
Q

Why do electrolytes conduct electricity?

A

As they have free ions that can move and carry charge

23
Q

What do the positive(cations) and negative(anions) move to when they are free?

A
  • Cations move to the negative electrode(Cathode)

- Anions move to the positive electrode(Anode)

24
Q

What do the positive ions gain when at the negative electrode?

A

Gain electrons to become atoms. =Reduction

25
Q

What do negative ions lose when at the positive electrode?

A

Lose electrons to become atoms=Oxidation

26
Q

What are the 2 most common electrolytes?

A
  • Molten ionic compounds

- Aqueous ionic compounds

27
Q

What ions does a molten ionic compound contain?

A

Free ions that move and carry charge

28
Q

What ions does Lead(II) Bromide contain?

A
  • Cation =Lead(II), Pb2+

- Anion= Bromide, Br-

29
Q

Pb2+ + 2e- =

A

Pb

30
Q

What is the positive ion Pb2+ attracted to?

A

Cathode (-ve electrode)

31
Q

What is observed when Pb2+ + 2e-

A

Silvery grey liquid formed, which sinks to the bottom

32
Q

What is negative ion Br- attracted to?

A

Anode(+ve electrode)

33
Q

2Br- =

A

Br2 + 2e-

34
Q

What is observed when Br- is attracted to anode?

A

Red-Brown pungent gas evolved

35
Q

what are the 5 steps to make iron?

A

1
coke burns in oxygen to produce carbon dioxide
2
carbon dioxide reacts with more coke to produce the reducing agent which is carbon monoxide
3
iron(111) oxide reacts with carbon monoxide to produce molten iron and carbon dioxide
4
calcium carbonate thermally decomposes to form calcium oxide and carbon dioxide
5
acidic silicon dioxide impurities react with calcium oxide to form molten slag

sorryyyyy should of made separate cards oops

36
Q

what is a reversible reaction?

A

one where reactants can change into products and the products can change back into reactants
visualise the symbol cuz i can’t type it :)

37
Q

what is dynamic equilibrium ?

A

when the rate of the forward reaction is equal to the rate of the reverse reaction and the amounts of reactants and products remain constant

38
Q

learn test for water cuz i can’t rlly type the sign and shit for equilibrium

A

beep boo beep

39
Q

what will happen if copper 11 sulfate ( CuSO4.5H2O) is heated to constant mass?

A

it will loose water and become anhydrous

40
Q

what is the empirical formula?

A

the simplest whole number ratio of atoms of each element in a compound

41
Q

what is the molecular formula ?

A

the actual number number of atoms of each element present in a compound

42
Q

How do you calculate moles?

A

MASS➗Mr

43
Q

How do calculate concentration (mol/dm3)

A
  • moles➗Volume(dm3)

Chemistry Aliyya (5 decks)

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