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AS Chemistry > Acids and Redox > Flashcards

Acids and Redox Flashcards

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1
Q

What does an acid do when dissolved in water?

A

Releases hydrogen ions as protons into the solution

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2
Q

What is the difference between a strong acid and a weak acid?

A

A strong acid completely dissociates in water

A weak acid partially dissociates in water

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3
Q

What kind of acids are most organic acids?

A

Weak acids

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4
Q

What does a base do to an acid?

A

Neutralises it to form a salt

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5
Q

What is an alkali?

A

A base that dissolves in water releasing hydroxide ions into the solution

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6
Q

What happens in neutralisation?

A

A h+ ion reacts with an OH- ion to make water

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7
Q

What is released when acid reacts with a metal carbonate?

A

Salt
Water
Carbon dioxide

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8
Q

What is a titration?

A

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

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9
Q

What three things can titration a be used for?

A

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

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10
Q

What is used to make up a standard solution?

A

A volumetric flask

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11
Q

When do you stop a titration?

A

When you reach concordance

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12
Q

What is important when working out the mean titre?

A

Use only your closest accurate titres

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13
Q

What is an oxidation number?

A

The number of electrons used in bonding to a different element

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14
Q

What is the oxidation number for elements?

A

0

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15
Q

What is the oxidation number for oxygen?

A

-2

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16
Q

What is the oxidation number for hydrogen?

A

1

17
Q

What is the oxidation number of f?

A

-1

18
Q

What does the sum of the oxidation numbers equal?

A

Total charge

19
Q

Which element is described as being reduced?

A

The one which lost oxygen

20
Q

Which element is described as being oxidised?

A

The one that gained oxygen

21
Q

What do redox reactions involve?

A

Oxidation and reduction

22
Q

What can redox be applied to as well as oxygen?

A

The loss and gain of electrons

23
Q

What is reduction in oxidation number terms?

A

A decrease

24
Q

What is oxidation in oxidation number terms?

A

An increase

25
Q

What does a metal and acid produce?

A

Salt and hydrogen

26
Q

What do all acids contain in their formula?

A

Hydrogen

AS Chemistry (16 decks)

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