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AQA GCSE Chemistry Revision > Acids, alkalis and salts > Flashcards

Acids, alkalis and salts Flashcards

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1
Q

Which type of ions do acids produce in aqueous solutions?

A

H+

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2
Q

Acidic solutions have a pH of less than…

A

7

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3
Q

Which type of ions do alkalis produce in aqueous solutions?

A

OH-

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4
Q

Alkalis have a pH value of more than…

A

7

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5
Q

What is the pH value of a neutral substance?

A

7

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6
Q

What is the colour of a strong acid in universal indicator?

A

Red

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7
Q

What is the colour of a weak acid in universal indicator?

A

Orange - red

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8
Q

What is the colour of a neutral solution in universal indicator?

A

Green

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9
Q

What is the colour of a weak alkali in universal indicator?

A

Blue

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10
Q

What is the colour of a strong alkali in universal indicator?

A

Purple

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11
Q

Describe the colour of red litmus paper in acids, neutral solutions, and alkalis.

A

Red litmus paper:

  • Stays red in acids
  • Stays red in neutral solutions
  • Turns blue in alkali solutions
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12
Q

Describe the colour of blue litmus paper in acids, neutral solutions, and alkalis.

A

Blue litmus paper:

  • Turns red in acids
  • Stays blue in neutral solutions
  • Stays blue in alkalis
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13
Q

What is a base?

A

A substance that reacts with an acid to form salt and water

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14
Q

What are the two types of bases?

A
  • Metal oxides
  • Metal hydroxides
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15
Q

What are alkalis?

A

Bases that are soluble in water

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16
Q

Which kinds of bases are alkalis (soluble in water)?

A

Metal hydroxides

17
Q

What is a neutralisation reaction?

A

A reaction between an acid and a base (to form a salt and water)

18
Q

Give the general word equation for a neutralisation reaction.

A

acid + base → salt + water

19
Q

Use an ionic equation to show how water is made in a neutralisation reaction.

A

H+ + OH- → H2O

20
Q

Give the general word equation for the reaction between a metal and an acid.

A

metal + acid → salt + hydrogen

21
Q

Which salt is made when iron reacts with sulfuric acid?

A

Iron sulfate

22
Q

magnesium + hydrochloric acid -→

A

magnesium chloride + hydrogen

23
Q

Sulfuric acid + copper oxide →

A

Copper sulfate + water

24
Q

Nitric acid + sodium hydroxide → sodium nitrate + water

Which type of reaction is this?

A

Neutralisation reaction

25
Q

What is the word equation for the reaction of an acid with a carbonate?

A

Acid + carbonate → salt + water + carbon dioxide

26
Q

Hydrochloric acid + copper carbonate →

A

copper chloride + water + carbon dioxide

27
Q

What is the formula of aluminium sulfate?

The formulae of the ions are Al3+ and SO42-

A

Al2(SO4)3

28
Q

Copper sulfate can be made using a neutralisation reaction.

What is this neutralisation reaction between?

A

copper oxide + sulfuric acid

29
Q

What is a dilute solution?

A

A solution that contains a relatively small amount of dissolved solute

30
Q

What is a concentrated solution?

A

A solution that contains a large amount of dissolve solute

31
Q

What are strong acids?

A

Acids that completely dissociate into H+ ions

32
Q

Hydrochloric acid is a strong acid.

Which two ions does hydrochloric acid dissociate into?

A

Hydrogen (H+) and chlorine (Cl-)

33
Q

What does the symbol ⇌ mean?

A

Reversible reaction

AQA GCSE Chemistry Revision (13 decks)

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