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Chemistry with NAJI the legend > Chemcial Changes > Flashcards

Chemcial Changes Flashcards

1
Q

What does pH mean?*

A

Amount of hydrogen ions present in solution.
More hydrogen ion present lower pH value, more acidic
Less hydrogen ion present higher pH value, more alkali

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2
Q

What is the pH of pure water

A

pH 7

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3
Q

What are methods of measuring pH levels

A

Litmus paper
Universal indicator
pH probe

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4
Q

What type of reaction is it when an acid + base react?

A

Neutralisation reaction

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5
Q

Word and symbol equation of acids reacting with bases?

A

acid + alkali = water + salt

H + (OH) = H20`

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6
Q

What is a strong acid?

A

Full ionise when dissolved in water

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7
Q

What is a weak acid?

A

Partially ionise when dissolved in water?

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8
Q

What is an example of a strong acid?

A

HCL

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9
Q

What is an example of a weak acid

A

Carboxylic acid eg ethanolic

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10
Q

What is the word equation for the disassociation of HCL

A

HCL =H+CL

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11
Q

Symbol equation of the disassociation of ethanolic acid?

A

CH3COOH = H+CH3COO

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12
Q

Compare the rate of reaction for strong and weak acids?

A

The rate of reaction is greater for strong acids due to increased concentration of H ions

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13
Q

What happens to H+ when the pH from 5 lowers to 4?

A

H+ in solution multiply by 10

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14
Q

What is the differences between strong acids and concentrated acids?

A

The concentrated acids are how many particles there are in a given volume, strength determines ionising ability

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15
Q

What is the word equation for acid and an metal oxides?

A

acid + metal oxide = salt + water

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16
Q

Why does this occur?

A

Metal oxides = bases

17
Q

What is the word equation for acid and metal hydroxide?

A

acid + hydroxide = salt + water

18
Q

What happens when hcl + cuo

A

HCL + CuO = Copper chloride + water

19
Q

What is the equation of sulphuric acid + potassium hydroxide?

A

H2SO4 + K(OH) = potassium sulphuric + water

20
Q

What happens when acids react with metal carbonates?

A

acid + carbonate = salt + water + carbon dioxide

21
Q

What is the reaction between sodium carbonate and hydrochloric acid

A

hydrochloric + sodium chloride = sodium chloride + water + carbon dioxide

22
Q

What is the reactivity series?

A 
Potassium 
Sodium
Lithium
Calcium 
Magnesium
Carbon 
Zinc
Iron
Hydrogen
Copper
23
Q

What happens when a metal reacts with an acid?

A

acid + metal = salt + hydrogen

24
Q

How can you determine rate?

A

Rate is determined by how many bubbles produced per minute.

25
Q

What happens when a metal reacts with water?

A

metal + water = metal hydroxide + hydrogen

26
Q

What is oxidation?

A

Gain of oxygen
Loss of electrons
Loss of hydrogen

27
Q

What is reduction?

A

Loss of Oxygen
Gain of electrons
Gain of hydrogen

28
Q

Oxidation example?

A

2MG+02=2MgO

29
Q

Reduction example?

A

2CuO+C = 2Cu + CO2

30
Q

What is generated when iron oxide becomes reduced with carbon?

A

2Fe2SO3 + 3C = 4Fe + 3CO3

31
Q

What is a redox reaction?

A

The loss of electrons and gain of electrons at the same time

32
Q

Displacement reactions, word, symbol and ionic equation between iron and copper sulphate.

A

Iron + copper sulphate = iron sulphate + copper
Fe + CuSO4 = FeSO4 + Cu

Fe =Fe2 =+2e- Cu2+ +2e- = Cu

33
Q

What is electrolysis?

A

Electrolysis is the breaking down with the use of electricity.
Positive ions will move towards the cathode and gain electrons
Negative ions will move towards the anode and lose electrons

Chemistry with NAJI the legend (7 decks)

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