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Science (chemistry) > C5- Chemical Changes > Flashcards

C5- Chemical Changes Flashcards

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1
Q

Whats is the nemonic to remember the reactivity with series?

A

Please stop calling me a cute zebra tom likes her calling sam giant

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2
Q

How do Potassium, sodium, lithium and calcium react with water?

A

They fizz and give off hydrogen gas leaving a solution of a metal hydroxide

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3
Q

How do potassium, sodium and lithium react with dilute acid?

A

Explode

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4
Q

How do magnesium aluminium and zinc react with water?

A

They have a very slow reaction

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5
Q

How do calcium magnesium aluminium and zinc react with dilute acid?

A

Fizz, giving off hydrogen gas and form a salt

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6
Q

How do tin and lead react with water?

A

They slight react with steam

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7
Q

How do tin and lead react with dilute acid?

A

They react slowly with warm acid

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8
Q

Oxidation

A

The loss of electrons

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9
Q

Reduction

A

The gain of electrons

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10
Q

How do metals displace each other?

A

A more reactive metal will displace a less reactive metal from its aqueous solution

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11
Q

What is an ionic equation?

A

It shows only the atoms and ions (with charges) that change in the reaction

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12
Q

Why are most metals found in the earth as compounds?

A

Because many metals can react with other elements or oxygen ti form compounds or oxides

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13
Q

Whats a metal ore?

A

It contains enough of the metal to make it economic to extract the metal (the ores are mined)

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14
Q

How are metals above carbon in the reactivity series extracted?

A

By electrolysis

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15
Q

How are metals above hydrogen in the reactivity series extracted?

A

Reduced from its ore by heating with carbon

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16
Q

How is copper extracted from its ore?

A

Reduced from its ore by reacting with hydrogen

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17
Q

Which metals in the reactivity series are found native ?

A

Silver gold and platinum

18
Q

Whats a salt?

A

A compound formed when the hydrogen in an acid is wholly or partially replaced by metal or ammonium ions

19
Q

Whats is the product of a reaction between metal+acid?

A

A salt+ hydrogen

20
Q

What salt is produced when hydrochloric acid reacts with a metal ?

A

Chloride

21
Q

What salt is produce when sulphuric acid reacts with a metal?

A

Sulfate

22
Q

What salt is produced when nitric acid reacts with a metal?

A

Nitrate

23
Q

Base

A

Compounds that neutralise acids

24
Q

Alkalis

A

Bases that are soluble in water

25
Q

What are the products of a reaction between acid+base(alkali) ?

A

A salt+ water

26
Q

What is the product of a reaction between acid+ a carbonate?

A

A salt + water+ carbon dioxide

27
Q

Acids

A

Substances that contain hydrogen and produce H+ (aq) ions when you add to water

28
Q

Whats the difference between a concentrated solution and a dilute solution?

A

A conc solution contains a greater amount of the solute in the same volume than a dilute solution

29
Q

Why do we not react alkali (group 1) metals with acid?

A

Reaction would be too violent and not safe

30
Q

Why do we dilute solutions? And what with?

A

We dilute with water (or another solvent) to make it weaker and safer

31
Q

What are strong acids?

A

Harmful when conc have to be diluted

32
Q

What are weak acids?

A

Not harmful when diluted or even sometimes when concentrated

33
Q

What must acids dissolve in before they can show their properties?why?

A

Water, as in water all acids are ionised

34
Q

What happens when weak acids dissolve in water?

A

They do not ionise most of the time and even if they do they reaction is reversible

35
Q

What ions do acids release when dissolved in water?

A

H+(aq)

36
Q

Give an example of a strong acid?

A

Hydrochloric acid
Sulphuric acid
Nitric acid

37
Q

Give an example of a weak acid?

A

Ethanoic acid
Citric acid
Carbonic acid

38
Q

What would the pH value be for a conc of H+(aq) ions of 0.10?

A

1.0

39
Q

What would the pH value be for a conc of H+(aq) ions of 0.010?

A

2.0

40
Q

What is the conc of H+(aq) ions when the pH value is 3.0?

A

0.0010

Science (chemistry) (6 decks)

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