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YEAR 9 - Chemistry > Booklet 3 > Flashcards

Booklet 3 Flashcards

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1
Q

What is needed for rusting?

A

Water and Oxygen

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2
Q

What is Rusting?

A

The corrosion of iron

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3
Q

What is a disadvantage of physical barriers?

A

Stops working if the surface becomes scratched or broken

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4
Q

What is galvanising?

A

Coating something in iron or zinc

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5
Q

What is physical barrier protection?

A

Stops rusting by coating something to keep out air and water

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6
Q

Name a disadvantage of sacrificial protection

A

Stops working when more reactive metal is used up

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7
Q

Corrosion is what?

A

The Formation of a compound on the surface of a metal

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8
Q

What metals are used for sacrificial metals?

A

Magnesium or Zinc

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9
Q

What is rust?

A

Hydrated iron oxide

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10
Q

Name some types of physical barriers

A

Paint,oil,grease,tin and other less reactive metals

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11
Q

What speeds up rusting?

A

Salts or acids

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12
Q

What metal is obtained from Bauxite?

A

Aluminium

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13
Q

What metal is obtained from haematite?

A

Iron

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14
Q

What metal is obtained from galena?

A

Lead

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15
Q

What metal is obtained from cinnabar?

A

Mercury

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16
Q

What metal is obtained from argentite?

A

Silver

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17
Q

What does REDOX stand for?

A

Reduction and Reduction reactions

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18
Q

What does potassium manganite decompose to produce?

A

Oxygen gas

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19
Q

What decomposes to form oxygen and water? And what experiment is it from?

A

Hydrogen Peroxide (H2O2), the Elephants toothpaste experiment

20
Q

What is used in the elephants toothpaste experiment to speed up the reaction?

A

A catalyst

21
Q

Why does the chemical reaction in elephants toothpaste cause the chemical to push out of the container?

A

The oxygen gas is produced,since the molecules are further apart than liquids so the same number of molecules takes up more space and the oxygen quickly pushes it out of the container

22
Q

Combustion can be described as what?

A

A rapid, exothermic,oxidation reaction

23
Q

Define distiallation

A

Evaporation then condensation

24
Q

Define Decomposition

A

The breaking down of a molecule to form more than 1 product

25
Q

What does Sacrificial Protection involve?

A

Attaching iron to a more reactive metal

26
Q

What colour will UI turn if a solution is an acid,neutral,alkali?

A

Warm colour e.g red
Green (only)
Blue or purple

27
Q

What do acidic solutions tend to be?

A

Non-metals

28
Q

What do Alkalies tend to be?

A

Metal oxides

29
Q

What happens to elements which are burned in oxygen?

A

The are said to be oxidised

30
Q

What is the word equation for Rust?

A

Iron+oxygen+water -> hydrated iron oxide (rust)

31
Q

What is the percentage of oxygen in air?

A

20%

32
Q

In the experiment about how much air is used in rusting, how can you prove that the reaction is complete?

A

The water rises by 20% which is the amount of oxygen in air so it is reasonable to say rust has formed. (Oxygen has been used)

33
Q

Is corrosion a quick reaction?

A

No, but a more reactive metal can quicken the reaction

34
Q

Can rust form if only water or iron are present?

A

No the reaction requires both chemicals

35
Q

What does corrosion form to protect it from further rust?

A

An oxide layer

36
Q

What properties does rust have?

A

Brittle and weak, crumbles and breaks

37
Q

How can reduction be described?

A

The loss of oxygen

38
Q

In the reduction of copper oxide, what do you use or reduced the copper?

A

Carbon

39
Q

What is the word equation for the reduction of copper oxide?

A

Copper oxide + carbon -> copper + carbon dioxide

40
Q

If copper oxide has been reduced using Carbon, what has been oxidised?

A

Carbon

41
Q

What does stoichiometric mean?

A

Relating to quantities of reactants in simple integral ratios, as prescribed by an equation or formula.
(Used in a thermit reaction p15)

42
Q

Name a metal which does not react with dilute acid

A

Sodium

43
Q

What alloy is used for bridges?

A

Steel, as it is strong

44
Q

What metal burns very brightly?

A

Magnesium

45
Q

What defines being easily beaten into shape?

A

Malleable

YEAR 9 - Chemistry (7 decks)

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