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Chemistry > Topic 12: Acids, Bases and Salts > Flashcards

Topic 12: Acids, Bases and Salts Flashcards

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1
Q

The strongest acid has a pH of

A

0

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2
Q

The strongest alkali has a pH of

A

14

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3
Q

Universal Indicator?

A

Used to show pH level red - orange - yellow - green - blue - purple.

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4
Q

Litmus Paper?

A

Used to test is a substance is acid or alkaline, RED - ACIDIC. PURPLE - NEUTRAL. BLUE - ALKALINE.

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5
Q

Phenolphthalein?

A

Will change from colourless in acidic solutions to bright pink in alkaline solutions.

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6
Q

Methyl orange?

A

Changes from red in acidic solutions to yellow in alkaline solutions.

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7
Q

An Acid is a source of?

A

Hydrogen ions, H+ ions will a pH of less then 7.

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8
Q

A Base is a substance that can?

A

Neutralise acid.

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9
Q

Alkalis are?

A

soluble bases.

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10
Q

An Alkali is a source of?

A

Hydroxide ions (OH-) and has a pH greater then 7.

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11
Q

The reaction between a acid and a base is called a?

A

Neutralization reaction.

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12
Q

acid + base

A

= salt + water (Products are neutral)

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13
Q

H+(aq) + OH-(aq) =

A

H2O(l)

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14
Q

Acid + Metal Oxide =

A

salt + water

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15
Q

Hydrochloric acid + copper oxide =

A

copper chloride + water

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16
Q

2HCl + CuO =

A

CuCl2 + H2O

17
Q

Acid + Metal Carbonate =

A

Salt + Water + Carbon Dioxide

18
Q

Hydrochloric acid + sodium carbonate =

A

sodium chloride + water + carbon dioxide

19
Q

2HCl + Na2CO3 =

A

2NaCl + H2O + CO2

20
Q

What is the composition of air?

A

78% Nitrogen
21% Oxygen
1% other gasses
0.04% CO2

21
Q

metal hydroxide + acid =

A

metal hydroxide + acid → a salt + water

22
Q

Magnesium carbonate can be made as a precipitate by reacting together solutions of two soluble salts.

A

Any two metal salts, example,
magnesium sulphate.
magnesium nitrate.

23
Q

Obtaining a pure dry sample of a metal carbonate.

A
  • Filter
  • Wash solid with water
  • dry by warming gently.

Chemistry (20 decks)

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