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Chemistry OCR A A level > Acids and Redox > Flashcards

Acids and Redox Flashcards

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1
Q

What element do all acids contain?

A

Hydrogen

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2
Q

What happens when an acid is dissolved in water?

A

Releases H+ ions into the water as protons

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3
Q

Define strong acid

A

An acid that completely dissociates in solution releasing all H+ ions

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4
Q

Define weak acid

A

An acid that only partially dissociates in aqueous solution

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5
Q

Define a base

A

Something that neutralises an acid to form a salt

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6
Q

Give 4 examples of bases

A

Metal Oxides, Metal Hydroxides, Metal Carbonates and Ammonia

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7
Q

Define an alkali

A

A base that dissolves in water to release OH- ions into the solution

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8
Q

What happens during a neutralisation reaction?

A

H+ ions react with base to form a salt and neutral water. The H+ ions from the acid are replaced by metal or ammonium ions from the base.

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9
Q

Acid + Metal Oxide =

A

salt and water

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10
Q

Acid + Alkali=

A

salt and water

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11
Q

Write the ionic equation of an acid and an alkali

A

H+(aq) + OH-(aq) = H20 (l)

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12
Q

Acid + Metal Carbonate =

A

Salt + Water + Carbon Dioxide

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13
Q

What is a titration?

A

A technique used to accurately measure the volume of one solution that reacts exactly with another

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14
Q

What 3 things is a titration used for?

A

Finding the concentration of a solution
Identification of unknown chemicals
Finding the purity of a substance

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15
Q

Where do you measure from in a burette?

A

The bottom of the meniscus

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16
Q

What difference is accepted in titrations when calculating an average?

A

0.1 cm^3

17
Q

What is the oxidation number for an element?

A

0

18
Q

What is the oxidation number of ‘O’ in peroxides?

A

-1

19
Q

What is the oxidation number of ‘O’ bonded to ‘F’?

A

+2

20
Q

What is the oxidation number of ‘H’ in metal hydrides?

A

-1

21
Q

What does the sum of the oxidation number equal?

A

Total Charge

22
Q

What does reduction mean in terms of electrons?

A

Reduction is the gain of electrons

23
Q

What does oxidation mean in terms of electrons?

A

Oxidation is the loss of electrons

Chemistry OCR A A level (20 decks)

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