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LGS GCSE OCR Chemistry A > C2 > Flashcards

C2 Flashcards

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1
Q

Define relative atomic mass?

A

The mean mass of an atom compared to 1/12 the mass of a Carbon-12 atom

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2
Q

What is the symbol for Relative atomic mass?

A

Ar

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3
Q

Define relative formula mass

A

The mean mass of a unit of substance compared to 1/12 the mass of a Carbon -12 atom

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4
Q

What is the symbol for relative formula mass?

A

Mr

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5
Q

Define empirical formula

A

Shows the simplest whole number ratio of the atoms of each element in a compound

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6
Q

What does pure mean?

A

Consists of just one element or compound

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7
Q

How does purity affect melting point? (Two ways)

A

Melting point is reduced and is over a range of temperatures

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8
Q

What is a solute?

A

A substance (solid) that dissolves

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9
Q

What is a solvent?

A

The substance which does the dissolving (liquid)

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10
Q

What does soluble mean?

A

A substance can dissolve in a particular solvent

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11
Q

What is the filtrate?

A

The substance that passes through the filter paper

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12
Q

What is the residue in filtration?

A

The substance that stays on the filter paper

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13
Q

What does saturated mean?

A

No more solute can dissolve at that temperature

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14
Q

What does a condenser do?

A

Cools a gas back to a liquid state

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15
Q

What does fractional distillation do?

A

Separates two or more substances from a mixture in the liquid state - they have to have different boiling points

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16
Q

What is the stationary phase?

A

In chromatography the part that does not move - the paper or the plate

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17
Q

What is the mobile phase?

A

In chromatography the part that moves - the solvent

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18
Q

What is the stationary phase in gas chromatography?

A

Silica or alumina powder

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19
Q

What is the mobile phase in gas chromatography?

A

An unreactive carrier has such as nitrogen

20
Q

How do you calculate the Rf value?

A

Distance travelled by substance divided by distance travelled by solvent

21
Q

How would you separate a mixture of insoluble and soluble substances?

A

Dissolving followed by filtration

22
Q

How would you obtain a solute from a solution

A

Crystallisation

23
Q

How would you obtain a solvent from a solution

A

Simple distillation

24
Q

How would you separate coloured soluble substances?

A

Paper or thin-layer chromatography

25
Q

What does malleable mean?

A

Bend without shattering

26
Q

What does ductile mean?

A

Can be pulled into wires

27
Q

Which side of the periodic table are non metals found on?

A

Right

28
Q

Metal oxides in solution are acidic or alkali?

A

Alkaline

29
Q

Non metal oxides in solution are acidic or alkaline?

A

Acidic

30
Q

What is the maximum number of electrons in each shell?

A

2.8.8.18

31
Q

What charge do metal ions have?

A

Positive

32
Q

What is an ion?

A

A charged particle formed when atoms gain or lose electrons

33
Q

What is ionic bonding?

A

Attraction between positive and negative ions

34
Q

What is a covalent bond?

A

A shared pair of electrons - the attraction between the shared pair of electrons the nuclei of the bonded atoms

35
Q

What are intermolecular forces?

A

Weak forces of attraction between molecules

36
Q

What are giant covalent structures?

A

Many non-metal atoms joined by covalent bonds arranged in a repeating regular structure

37
Q

Which types of polymers have cross-linking?

A

Thermosetting

38
Q

What is metallic bonding?

A

The attraction between positive metal ions in a lattice and delocalised electrons

39
Q

What is the order of elements in the periodic table?

A

In order of increasing atomic number

40
Q

What are allotropes?

A

Different forms of an element with different atomic arrangements, e.g. diamond and graphite

41
Q

Why doesn’t diamond conduct electricity?

A

There are no delocalised electrons

42
Q

What does graphite conduct electricity?

A

It has delocalised electrons, free to move

43
Q

What change of state happens during condensing?

A

Gas to liquid

44
Q

What are the typical sizes of nano particles?

A

1-100nm across (x10-9m)

45
Q

How do you calculate surface are to volume ratio?

A

Surface area divided by volume

46
Q

What are the risks associated with nano particles?

A

Can be breathed in
Pass through skin
May take a long time to break down
Toxic substances may stick to them

LGS GCSE OCR Chemistry A (7 decks)

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