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Science- Chemistry > Chemical Changes > Flashcards

Chemical Changes Flashcards

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1
Q

Metal oxides are?

A

The product of the oxidation reaction of Metal and Oxygen.

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2
Q

Metal produces what form of ion?

A

Positive ions

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3
Q

What is a displacement reaction?

A

A reaction when a more reactive metal displaces a less reactive metal.

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4
Q

How does Potassium react when exposed to water?

A

Violently

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5
Q

How does Sodium react when exposed to water?

A

Very Quickly

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6
Q

How does Lithium react when exposed to water?

A

Quickly

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7
Q

How does Calcium react when exposed to water?

A

More Slowly

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8
Q

How does Calcium react when exposed to dilute acid?

A

Very quickly

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9
Q

How does Magnesium react when exposed to dilute acid?

A

Quickly

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10
Q

How does Zinc react when exposed to dilute acid?

A

More slowly than magnesium

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11
Q

How does Iron react when exposed to dilute acid?

A

More slowly than zinc

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12
Q

How does Copper react when exposed to dilute acid?

A

Very slowly

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13
Q

How does Silver react when exposed to dilute acid?

A

Barely reacts

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14
Q

How does Gold react when exposed to dilute acid?

A

No reaction

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15
Q

How is the order of reactivity affected?

A

Via a metals tendency to form its positive ion.

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16
Q

Why are most metals found as compounds?

A

As most, unlike gold, are reactive enough to bond to other elements?

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17
Q

How are most metals less reactive than carbon extracted?

A

Reduction with Carbon

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18
Q

Oxidation in terms of electrons is?

A

Oxidation is the loss of electrons

19
Q

Reduction in terms of electrons is?

A

Reduction is the gain of electrons

20
Q

What are the products of the reactants metal and an acid?

A

Metal Salt and hydrogen

21
Q

How are acids neutralised?

A

Alkalis (soluble metal hydroxides) and basis (insoluble metal hydroxides and metal oxides).

22
Q

In a neutralization reaction, what are the products?

A

Metal salt and Water

23
Q

In a neutralization reaction which uses metal carbonates, what are the products?

A

Metal salts, water and carbon dioxide.

24
Q

How can a soluble salt be produced?

A

Reacting an acid with a solid insoluble substance.

25
Q

Solid salts are formed by?

A

Crystallization of a soluble salt

26
Q

Acids form what form of ion in an aqueous solution?

A

H+ ions

27
Q

Alkalis form what form of ion in an aqueous solution?

A

OH- ions

28
Q

What is Alkalinity measured in.

A

pH 0-14, measured using Universal indicator

29
Q

In a neutralisation reaction, what is formed?

A

Water, as OH- and H+ ions bond together

30
Q

What is a measuring by titration?

A

The method by which one can work out neutralising quantities of Acids and Alkalis.

31
Q

What is a strong acid?

A

An acid which completely ionis’.

32
Q

Name some examples of strong acids?

A

Hydrochloric, nitric and sulfuric acids.

33
Q

What is a weak acid?

A

An acid which only partially ionis’.

34
Q

Name some examples of weak acids?

A

Ethanoic, citric and carbonic acids.

35
Q

As pH decreases by one unit what happens?

A

The hydrogen ion concentration increases by a factor of 10

36
Q

What is required in electrolysis?

A

Free ions which can pass through a solution.

37
Q

A solution which has free ions and can conduct electricity is an?

A

Electrolyte

38
Q

In electrolysis, the positive electrode is?

A

The anode

39
Q

In electrolysis, the negative electrode is?

A

The cathode

40
Q

What happens at the electrodes during electrolysis?

A

Ions are discharged forming elements.

41
Q

What are the products of electrolysis of ionic compounds?

A

Metals at the cathode and

Non-metals at the anode.

42
Q

When is electrolysis used in extracting metals?

A

When a metal is more reactive than carbon or reacts with carbon.

43
Q

What are the products of electrolysis of aqueous soloutions?

A

At the cathode- Hydrogen is produced if the metal is more reactive.
At the anode- Oxygen is produced unless the solution contains a halogen.

Science- Chemistry (12 decks)

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