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science > AK > Flashcards

AK Flashcards

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1
Q

acid + reactive metal ->

A

salt + hydrogen gas

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2
Q

acid + metal carbonate ->

A

salt + water + carbon dioxide

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3
Q

acid + base/acid alkali ->

A

salt + water

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4
Q

alkali + ammonium salt ->

A

salt + water + ammonia

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5
Q

-> salt + hydrogen gas

A

acid + reactive metal

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6
Q

-> salt + water + carbon dioxide

A

acid + metal carbonate

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7
Q

-> salt + water

A

acid + base/alkali

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8
Q

-> salt + water + ammonia

A

alkali + ammonium salt

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9
Q

Define acids

A

Substance which dissociates in water to produce hydrogen

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10
Q

Define bases

A

metal oxides and metal hydroxides

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11
Q

Define alkalis

A

bases that are soluble in water

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12
Q

Why is aqueous ammonia considered an alkali

A

When ammonia dissociates in water, hydroxide ions are formed

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13
Q

What is the reaction between acids and alkalis called

A

Neutralisation

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14
Q

What is a pH level

A

Measure of acidity or alkalinity of a solution

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15
Q

What is an indicator

A

Substance that has diff colours in acid and alkaline solutions

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16
Q

What are the least reactive metals

A

copper, gold, silver

17
Q

What are the three least reactive metals

A

copper, gold, silver

18
Q

If the gas/liquid turns red litmus paper -> blue, is it acid or alkali

A

alkaline

19
Q

If the gas/liquid turns blue litmus paper -> red, is it acid or alkali

A

acid

20
Q

What is the test for hydrogen gas

A

Gas extinguishes a lighted splint with a “pop” sound

21
Q

Explain why we cannot test for the gas with a lighted splint immediately when the metal is added to the acid

A

The metal needs time to react with the acid

22
Q

What is the test for carbon dioxide

A

Gas forms a white precipitate with limewater

science (20 decks)

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