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Science > States of Matter > Flashcards

States of Matter Flashcards

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1
Q

What does the particle model do?`

A

Explains state changes in a substance in terms of the arrangement, movement and energy stored in its particles

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2
Q

Describe the arrangement of particles in a gas, liquid and solid

A

Gas - random and far apart
Liquid - random and close together
Solid - regular and close together

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3
Q

Describe the movement of particles of the 3 states of matter

A

Gas - fast in all directions
Liquid - move around each other
Solid - vibrate about fixed positions

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4
Q

State changes are physical changes. What does this mean?

A

They can be reversed and the chemical properties of the substance don’t change

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5
Q

What do state changes change?

A

The particles’ arrangement, their movement and the amount of stored energy

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6
Q

What is sublimation?

A

From solid to gas

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7
Q

What is deposition?

A

From gas to solid

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8
Q

With what information can you predict the state of a substance?

A

If you know its melting point, boiling point and temperature

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9
Q

If a substance is below its melting point, what state is it in?

A

The solid state

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10
Q

If a substance is between the melting and boiling point, what state is it in?

A

The liquid state

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11
Q

If a substance is above the boiling point, what state is it in?

A

The gas state

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12
Q

Can the composition of a pure substance be changed?

A

No and it is the same in all parts of a piece of the substance

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13
Q

What is a mixture?

A

A substance that contains elements and/or compounds that are not chemically joined together

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14
Q

Why can’t we separate pure substances using physical methods like filtering or picking bits out?

A

Because it has the same fixed composition in all its parts

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15
Q

Why can you use physical methods to separate a mixture?

A

Because it does not have a fixed composition

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16
Q

What happens when a solid melts?

A

Its particles gain enough energy to overcome the weak forces of attraction between them

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17
Q

Give an example of a phyiscal poroperty

A

Melting point

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18
Q

What is a solution?

A

A mixture made up of solutes in a liquid called the solvent

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19
Q

What is a solute?

A

Dissolved substance

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20
Q

What is crystallisation?

A

When solutes are separated by evaporating the solvent to leave the solutes behind

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21
Q

What is a saturated solution?

A

A solution that contains the maximum amount of solute that can dissolve in that amount of solvent at that temperature

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22
Q

What is the filtrate?

A

The solvent and solute (s) that pass through the fine holes in the filter paper

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23
Q

What is the residue?

A

The bits of insoluble substances that can’t fit through the filter paper holes

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24
Q

What is a risk assessment?

A

Where the hazards of doing an experiment are identified

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25
Q

What is the use of chromatography?

A

To find out which coloured compounds a mixture contains

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26
Q

What is the solvent in paper chromatography called?

A

The mobile phase

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27
Q

What phase the paper in paper chromatography contain?

A

The stationary phase, through which the solvent and dissolved substances move

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28
Q

What is the name of the paper with the separated components on it called?

A

A chromatogram

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29
Q

What is the Rf value in paper chromatography?

A

The distance the compound has rises divided by the distance the solvent has risen

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30
Q

How do you calculate the Rf value?

A

Rf = Distance moved by the spot/Distance moved by the solvent

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31
Q

What can paper chromatography be used for?

A

-Distinguish between pure and impure substances
-Identify substances by comparing the pattern on the chromatogram with the patterns formed by known substances
Identify substances by calculating their Rf value

32
Q

What is distillation?

A

The process of separating the components or substances from a liquid mixture by using selective boiling and condensation

33
Q

What is the name of the apparatus used in distillation?

A

A still

34
Q

What is fractional distillation?

A

A distillation process that separates 2 or more liquids

35
Q

How can fractional distillation work>

A

Some liquids boil more easily than others due to their different boiling points, and so one will turn into vapour first

36
Q

What is desalination?

A

Producing pure water from sea water

37
Q

How does desalination work?

A

Using simple distillation - sea water is heated so that water vapour leaves it quickly. This vapour is then cooled and condensed, forming water without the dissolved salts

38
Q

Why is simple distillation usually not a suitable method for producing large volumes of drinking water?

A

A lot of energy must be transferred to sea water for this to happen

39
Q

What doe chemical analysis involve?

A

Using chemical reactions or sensitive machines to identify and measure the substances in a sample

40
Q

What are aquifers?

A

Underground rocks containing groundwater

41
Q

What are the 3 steps of water treatment?

A

Filtration, sedimentation and chlorination

42
Q

Why is chlorination an important part of water treatment?

A

Because the chlorine kills the microorganisms in the treated water

43
Q

What kind of melting points do pure substances have?`

A

Sharp melting points

44
Q

What do mixtures melt over?

A

A range of temperatures - no sharp melting points

45
Q

What is a pure substance?

A

Substance that contains only 1 element/compound

46
Q

What happens when salt is added to water?

A

It lowers the freezing point and it weakens the rigid lattice structure and molecules are disordered

47
Q

What does insolubke mean?

A

Doesn’t dissolve

48
Q

How do you purify a liquid?

A

By removing solid impurities from it

49
Q

Why does filtration work?

A

They have tiny pores that are:

  • large enough to let water molecules/dissolved substances through
  • small enough to stop insoluble solid particles getting through
50
Q

What do you use crystallisation for?

A

To produce solution crystals from a solution

51
Q

What is a saturated solution?

A

A solution that can’t hold any more solute

52
Q

Why is a hot water bath preferred for crystallisation?

A

Gives you more control over heating than a Bunsen Burner flame directly on the evaporating dish

53
Q

What is solubility?

A

The mass of a solute that dissolves in a given volume of a solvent at a given temperature

54
Q

Why does crystallisation work?

A
  • The solubility of the solute decreases as the saturated solution cools
  • Crystals form from the excess solute
55
Q

What happens when salt is added to water?

A

It lowers the freezing point and it weakens the rigid lattice structure and molecules are disordered

56
Q

What does insolubke mean?

A

Doesn’t dissolve

57
Q

How do you purify a liquid?

A

By removing solid impurities from it

58
Q

Why do you use a lid in paper chromatography?

A

It stops evaporation of the solvent

59
Q

What do you use crystallisation for?

A

To produce solution crystals from a solution

60
Q

What is a saturated solution?

A

A solution that can’t hold any more solute

61
Q

Why is a hot water bath preferred for crystallisation?

A

Gives you more control over heating than a Bunsen Burner flame directly on the evaporating dish

62
Q

What is solubility?

A

The mass of a solute that dissolves in a given volume of a solvent at a given temperature

63
Q

Why does crystallisation work?

A
  • The solubility of the solute decreases as the saturated solution cools
  • Crystals form from the excess solute
64
Q

What is the stationary phase?

A

A substance that does not move (the chromatography paper)

65
Q

What is the mobile phase?

A

A substance that moves through the stationary phase (the solvent)

66
Q

What happens during chromatography?

A

Each soluble substance in the mixture forms bonds with the two phases, but if it moves or not depends on which bonds are stronger:

  • Stationary phase - stay near bottom of paper
  • Mobile phase - move towards the top
67
Q

Why do you use a lid in paper chromatography?

A

It stops evaporation of the solvent

68
Q

What can you use a chromatogram for?

A
  • Distinguish between pure and impure substances
  • Identify a substance by company of pattern of spots with those of a known substance
  • Identify substances using Rf values
69
Q

Are soluble compounds carried up the paper faster or slower?

A

Faster than less soluble ones, so the compounds separate out

70
Q

How do you make pure water?

A

Using distillation - separating it from dissolved solids

71
Q

Why does distillation work?

A

When the mineral water evaporates, only the water turns to gas (vapour) and so it leaves the solid minerals with much higher boiling points behind. The pure vapour is then condensed, making a pure liquid

72
Q

In distillation, what is a condenser?

A

A central tube surrounded by a jacket of cold water. It keeps the tube cool, so that almost all of the vapour condenses and turns into a liquid

73
Q

What do anti-bumping granules do?

A

Make the liquid boil more smoothly; small bubbles of vapour form on the corners of the granules and reduce the risk of the liquid boiling over

74
Q

What is fractional distillation and why does it work?

A

The separation of a mixture into its component parts; some liquids boil more easily than others and will turn into vapour first

75
Q

What are the 3 stages of water treatment in order?

A

Sedimentation - large insoluble particles (like stone) sink to the bottom of the tank
Filtration - small insoluble particles are removed by filtering through beds of sand (water can get through sand but small insoluble particles stay at the top)
Chlorination - chlorine gas is bubbled from the water to kill microbes

76
Q

Give an advantage and disadvantage of simple distillation of sea water

A

Advantage - kills microbes in the sea water/produces pure water/uses plentiful raw materials
Disadvantage - needs a lot of energy to heat the water

77
Q

Why does the temperature remain constant during melting?

A

It is an isothermal process, meaning the temperature remains constant. The energy goes directly into changing the phase and state of the substance as opposed to changing the temperature of the substance

Science (23 decks)

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