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Chemistry > Section 2 > Flashcards

Section 2 Flashcards

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1
Q

sodium and water

A
  • melts
  • fizzes
  • moves around surface
  • may ignite
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2
Q

sodium and water equation

A

2Na + 2H2O –> 2NaOH + H2

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3
Q

lithium and water

A
  • floats
  • meltz
  • fizzes
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4
Q

potassium and water

A
  • burns with a lilac flame
  • floats
  • melts
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5
Q

what happens to the elements in group 1 as their atomic number increases?

A

their reactivity increases

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6
Q

chlorine state at room temp

A

gas

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7
Q

chlorine colour

A

green

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8
Q

bromine state at room temp

A

liquid

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9
Q

bromine colour

A

red-brown

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10
Q

iodine state at room temp

A

solid

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11
Q

iodine colour

A

dark grey

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12
Q

what is dissociation?

A

when a molecule splits up into ions

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13
Q

what colour is bromine in the displacement reaction?

A

orange

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14
Q

what colour is iodine in the displacement reaction?

A

brown

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15
Q

what would you observe when magnesium is added to a dilute acid?

A
  • vigorous reaction

- lots of bubbles

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16
Q

aluminium and acid

A
  • doesnt react much with cold acid
  • reacts vigorously with warm acid
  • produces lots of bubbles
17
Q

zinc/iron and acid

A
  • slow reaction with cold acid

- strong reaction when you heat them up

18
Q

rust equation

A

iron + oxygen +water –> hydrated iron (3) oxide

19
Q

two ways to prevent rusting:

A
  • painting/oiling

- galvanising

20
Q

oxygen in air

A

21%

21
Q

argon in air

A

0.9%

22
Q

nitrogen in air

A

78%

23
Q

carbon dioxide in air

A

0.04%

24
Q

how to measure the % of oxygen in the air (with iron or phosphorus)

A
  • soak iron wool in ACETIC acid
  • invert test tube in water
  • measure the volume of water at the start and end of the experiment
25
Q

what is used to make oxygen in the lab?

A

hydrogen peroxide

26
Q

what catalyst is used to make oxygen in the lab?

A

manganese(iv) oxide

27
Q

magnesium burning in air

A
  • bright white flame

- white magnesium oxide

28
Q

carbon burning in air

A
  • yellowy/orange flame

- carbon dioxide gas is produced

29
Q

sulfur burning in air

A
  • pale blue flame

- sulfur dioxide is produced

30
Q

what is used to make carbon dioxide in the lab?

A
  • calcium carbonate

- dilute HCl

31
Q

equation for the production of carbon dioxide

A

2HCl + CaCO3 –> CaCl2 + H20 + CO2

32
Q

thermal decomposition of copper carbonate:

A

CuCO3 –> CuO + CO2

33
Q

uses for Carbon dioxide

A
  • fire extinguishers

- fizzy drinks

Chemistry (15 decks)

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