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Chemistry > C4 > Flashcards

C4 Flashcards

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1
Q

What is an alkali?

A

A base that forms hydroxide ions (OH-) when dissolved in water

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2
Q

What are acids?

A

Acids form hydrogen (H+) ions when dissolved in water

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3
Q

What happens in oxidation reactions?

A

Losing electrons

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4
Q

What happens in reduction reactions?

A

Gaining electrons

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5
Q

Metals oxides

A

Acid + metal oxide = salt + water

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6
Q

Metal carbonates

A

Acid + carbonate = salt + water + carbon dioxide

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7
Q

Metal hydroxides

A

Acid + hydroxide = salt + water

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8
Q

What is an example of a Titration indicator?

A

Methyl orange (yellow in alkali and red in acid)

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9
Q

What is another titration indicator?

A

Phenolphthalein (pink in alkali and colourless in acid)

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10
Q

How is the strength of an acid determined?

A

How much it ionises in water
Are all H+ ions produced

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11
Q

Examples of strong acids

A

Nitric acid
Sulfuric acid

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12
Q

What is an example of weak acids

A

Ethanoic acid (used in vinegar)

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13
Q

What is a weak acid?

A

An acid that only partially ionises in water so not all of its molecule break up to form H+ ions

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14
Q

What are Electrolytes?

A

Ionic compounds that dissolves to make solution that conducts electricity

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15
Q

What is electrolysis?

A

Splitting of ionic compounds into their individual elements using a solution that conducts electricity

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16
Q

What is the positive electrose

A

Anode

17
Q

What is the negative electrode

A

Cathode

18
Q

What are the disadvantages of electrolysis?

A

Expensive
Lots of energy needed to melt ionic compounds and produce electrical current

19
Q

When do you use electrolysis?

A

When the metal you are extracting it more reactive than carbon

Chemistry (9 decks)

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