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Chemistry > Chemical Changes > Flashcards

Chemical Changes Flashcards

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1
Q

Describe how to make a pure dry sample of magnesium sulphate ? (6 marks)

A
  1. use sulphuric acid and use magnesium oxide
  2. filter the mixture and pour the magnesium sulphate into a basin
  3. heat till water evaporates
  4. leave to cool and pat dry
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2
Q

Whats the reactivity series of metals ?

A

Potassium Most reactive
Sodium
Lithium
Calcium
Magnesium
Carbon
Zinc
Iron
Hydrogen
Copper
Gold Least reactive

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3
Q

Whats is oxidation ?

A

Gain of oxygen

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4
Q

What is reduction ?

A

Loss of oxygen

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5
Q

Where are the unreactive metals fond and give an example ?

A

The earths crust like gold

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6
Q

What value do acid solutions have ?

A

Acidic solutions have pH values less than 7.

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7
Q

what values do alkaline solutions have ?

A

Alkaline solutions have pH values greater than 7.

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8
Q

What’s a base ?

A

A substance used to react with an acid to make salt

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9
Q

Whats the sign for an acid ?

A

H+

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10
Q

Whats the sign for a alkaline ?

A

OH-

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11
Q

How do you do an neutralisation reaction ?

A

You need to react and acid and alkali

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12
Q

How to make salts practical ?

A
  1. Add a mixed solution through filter paper into a beaker
  2. Use filtered solution and heat up
  3. Take off to let cool down
  4. After a day or two crystals will be formed
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13
Q

Whats the negatively charged electrode called in electrolysis ?

A

Cathode

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14
Q

what’s the positively charged electrode called in electrolysis ?

A

Anode

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15
Q

Where do negatively charged ions move in electrolysis ?

A

Anode

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16
Q

What happens to the positive ions that move to the cathode ?

A

They gain electrons

17
Q

What happens to the negatively charged ions that move to the anode ?

A

They loose electrons

18
Q

What gas comes of the cathode due to the positive ions ?

A

Hydrogen gas

19
Q

What gas comes off the anode due to the negatively charged ions ?

A

Oxygen gas

20
Q

Whats the test for hydrogen ?

A

hydrogen - lighted splint goes out with a squeaky pop

21
Q

Whats the test for oxygen ?

A

oxygen - a glowing splint relights

22
Q

what’s the test for chlorine ?

A

chlorine - damp blue litmus paper turns red and is then bleached white

Chemistry (10 decks)

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