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Science - Year 8 > Chemistry 4 > Flashcards

Chemistry 4 Flashcards

1
Q

Melting & boiling points of metals

A

High melting and boiling points, they are solids at room temperature

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2
Q

Metals are…

A

Malleable, strong and flexible, ductile and shiny

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3
Q

Metals are good conductors of…

A

Heat and electricity

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4
Q

Exceptions of metals and why?

A

Graphite (form of carbon that conducts electricity) and Mercury (liquid at room temperature)

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5
Q

Malleable

A

Can be hammered into different shapes

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6
Q

Melting & boiling points of non-metals

A

Low melting and boiling points

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7
Q

Non-metals are..

A

Brittle and not shiny

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8
Q

Non-metals are poor conductors of…

A

Heat and electricity

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9
Q

Brittle

A

When solid

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10
Q

Oxidation

A

A chemical reaction that takes place when a substance comes into contact with oxygen or another oxidizing substance

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11
Q

Combustion

A

A chemical process in which a substance reacts rapidly with oxygen and gives off heat

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12
Q

If a metal is soluble…

A

It will most likely be basic

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13
Q

Chemical property

A

How a substance reacts with other substances

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14
Q

Physical property

A

A characteristic of a substance that can be observed or measured without changing the identity of the substance

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15
Q

Catalyst

A

A substance that speeds up reactions without itself getting used up

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16
Q

Catalyst converter

A

A device incorporated in a motor vehicle, containing a catalyst for converting pollutant gases into less harmful ones

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17
Q

What metals are used in catalytic converters?

A

Platinum, Palladium and Rhodium

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18
Q

Rusting

A

Corrosion of iron. Oxygen and water are needed

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19
Q

What happens to iron if water and oxygen are present?

A

Rusts

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20
Q

What happens to iron if water, oxygen and salt are present?

A

Rusts more then, when water and oxygen are present

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21
Q

What happens to iron if boiled water and no oxygen are present with an oil layer?

A

Does not rust

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22
Q

What happens to iron if dry air (oxygen) and calcium chloride are present?

A

Does not rust

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23
Q

What stops corrosion of iron?

A

Painting, oil, powder and plastic

24
Q

Some metals react with cold water at what speed?

A

Very slow speed

25
Q

Group 1 and 2 i n the periodic table react…

A

Vigorously

26
Q

The lower you go down the periodic table the…

A

more reactive they become

27
Q

Most reactive metal

A

Potassium

28
Q

Least reactive metal

A

Gold

29
Q

Test for hydrogen

A

Place lit splint into the tube. If burns with squeaky pop hydrogen is present

30
Q

Some metals are unreactive with water but only reactive in the…

A

Form of steam

31
Q

What metals are reactive with steam?

A

Magnesium, iron and zinc

32
Q

Change variable

A

The thing you change

33
Q

Measure variable

A

The thing you measure

34
Q

Control variable

A

The thing that stays the same

35
Q

Good quality evidence needs to be…

A

Accurate and reliable

36
Q

Accuracy

A

How correct something is to its real value. Depends on the correct measuring device, calculation, controlling variables and the skill of the experiment.

37
Q

Reliability

A

How trustworthy something is. Repeating measurements allow you to be more certain about them.

38
Q

Best quality data will be…

A

Repeatable and reproducible, with a small range of values and few or no anomalous results.

39
Q

Data that is repeatable and reproducible is said to be…

A

Reliable

40
Q

Repeatable

A

Able to be done again. If the experiment repeats using the same method and equipment and gets the same results.

41
Q

Reproducible

A

Able to be reproduced or copied. If other people get similar or close results by using different equipment or method.

42
Q

What happens when metal reacts with acids?

A

The metal fizzes as effervescence occurs and the metal seems to disappear into the solution.

43
Q

Effervescence

A

Bubbles in a liquid

44
Q

How do you know chemical reaction is happening?

A

Colour change, effervescence, change of temperature, precipitation, odor.

45
Q

Alloy

A

When a metal has different materials added to it, or mixed with carbon

46
Q

Stainless steel is made by…

A

Melting iron and adding carbon, chromium and nickel.

47
Q

Stainless steel does not…

A

Rust

48
Q

Solder is made by…

A

Melting lead and adding tin.

49
Q

Solder melts at what temperature?

A

Lower temperatures than lead

50
Q

What is solder used for?

A

A ‘glue’ for electrical circuits.

51
Q

The atoms in a pure metal are…

A

Arranged in layers

52
Q

Adding an element with bigger atoms will…

A

Disrupt the packing of the metal atoms, making them harder to move and less malleable.

53
Q

The malleability of a metal is due to…

A

The layers sliding over one another.

54
Q

Boiling and melting points of pure metals are…

A

Fixed

55
Q

Boiling and melting points of alloys are…

A

Different or have a range depending on the composition of the alloy.

Science - Year 8 (3 decks)

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