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GCSE Chemistry > Acids & Alkalis > Flashcards

Acids & Alkalis Flashcards

1
Q

What colour does litmus paper go for each solution?

A

Acid - red
Neutral - purple
Alkali - blue

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2
Q

What colour does phenolphthalein go for each solution?

A

Acid - colourless

Alkali - bright pink

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3
Q

What colour does methyl orange go for each solution?

A

Acid - red

Alkali - yellow

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4
Q

What is an acid?

A

A source of hydrogen ions (H+)

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5
Q

What is an alkali?

A

A soluble base and a source of hydroxide ions (OH-)

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6
Q

Acid + base -> ?

A

Salt + water

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7
Q

Acid + metal oxide ->?

A

Salt + water

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7
Q

What is the reaction between an acid and a base called?

A

Neutralisation

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7
Q

What is the pH of the products when an acid neutralises a base?

A

Neutral, pH 7

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8
Q

Acid + metal carbonate ->?

A

Salt + water + carbon dioxide

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9
Q

Acid + metal -> ?

A

Salt + hydrogen

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10
Q

Are all nitrates soluble or insoluble?

A

Soluble

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11
Q

Are common chlorides soluble or insoluble?

A

Soluble (except from silver chloride)

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13
Q

Are common sulfates soluble or insoluble?

A

Soluble (except barium sulfate and calcium sulfate)

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15
Q

Are common carbonates soluble or insoluble?

A

Insoluble (except Sodium, potassium and ammonium carbonates)

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16
Q

+ _

H + OH –> ?

A

H20

17
Q

Hydrochloric acid + copper oxide –> ?

A

Copper chloride + water

18
Q

Sulfuric acid + calcium carbonate –>?

A

Calcium sulfate + water + carbon dioxide

19
Q

How do you make a soluble salt using acids and insoluble bases?

A
  1. You add the metal oxide/carbonate/Hydroxide to the acid and mix
  2. Filter out the excess base
  3. Heat the solution to remove some water
  4. Leave to crystallise
20
Q

How do you make an insoluble salt?(precipitation reaction)

E.g. Making insoluble silver chloride

A
  1. Add 10 cm3 of Silver nitrate to 10cm3 of sodium chloride solution in a 100cm3 beaker
  2. Filter the mixture into a 250cm3 conical flask using filter paper and a funnel
  3. Wash the precipitate with cold water
  4. Dry the precipitate between filter papers

GCSE Chemistry (13 decks)

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