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AQA Chemistry Paper 1: Combined Science > Topic 1: Atomic Structure and the Periodic Table > Flashcards

Topic 1: Atomic Structure and the Periodic Table Flashcards

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1
Q

What is an atom?

A

An atom is the smallest part of an element that can exist

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2
Q

What is an element?

A

An element is a substance of only one type of atom.

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3
Q

How are the elements listed and approximately how many are there?

A

They are listed in the periodic table; there are approximately 100.

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4
Q

Elements can be classified into two groups based on their properties; what are these groups?

A

Metals and non-metals

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5
Q

Elements may combine through chemical reactions to form new products; what are these new substances called?

A

Compounds

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6
Q

What is a compound?

A

Two or more elements combined chemically in fixed proportions which can be represented by formulae

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7
Q

Do compounds have the same properties as their constituent elements?

A

No, they have different properties.

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8
Q

What is a mixture? Does it have the same chemical properties as its constituent materials?

A

A mixture consists of two or more elements or compounds not chemically combined together; it does have the same chemical properties.

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9
Q

What are the methods through which mixtures can be separated (there are five)? Do these involve chemical reactions?

A

Filtration, crystallisation, simple distillation, fractional distillation and chromatography; they do not involve chemical reactions.

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10
Q

Describe and explain simple distillation.

A

Simple distillation is used to separate liquid from a solution - the liquid boils off and condenses in the condenser. The thermometer will read the boiling point of the pure liquid. Contrary to evaporation, we get to keep the liquid.

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11
Q

Describe and explain evaporation.

A

Evaporation is a technique for separation of a solid dissolved in a solvent form a solvent (e.g. salt from H20). The solution is heated until all the solvent evaporates; the solids stays in the vessel.

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12
Q

Describe and explain crystallisation.

A

Crystallisation is similar to evaporation, but we only remove some of the solvent by evaporation to form a saturated solution (the one where no more solid can be dissolved). Then, we cool down the solution. As we do it, the solid starts to crystallise, as it becomes less soluble at lower temperatures. The crystals can be collected and separated from the solvent via filtration.

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13
Q

Describe fractional distillation

A

Fractional distillation is a technique for separation of a mixture of liquids. It works when liquids have different boiling points.

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14
Q

Explain fractional distillation

A

The apparatus is similar to the one of simple distillation apparatus, with the additional fractionating column placed on top of the heated flask.

The fractioning column contains glass beads. It helps to separate the compounds. In industry, mixtures are repeatedly condensed and vapourised. The column is hot at the bottom and cold at the top. The liquids will condense at different heights of the column.

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15
Q

Describe filtration

A

Filtration is used to separate an insoluble solid suspended in a liquid.

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16
Q

Explain filtration

A

The insoluble solid (called a residue) gets caught in the filter paper, because the particles are too big to fit through the holes in the paper. The filtrate is the substance that comes through the filter paper. Apparatus: filter paper + funnel.

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17
Q

Describe chromatography

A

Chromatography is used to separate a mixture of substances dissolved in a solvent.

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18
Q

Explain chromatography

A

In paper chromatography, we place a piece of paper with a spot containing a mixture in a beaker with some solvent. The bottom of the paper has to be in contact with the solvent. The solvent level will slowly start to rise, thus separating the spot (mixture) into few spots (components).

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19
Q

What is a separating funnel?

A

A separatory funnel is an apparatus for separating immiscible liquids. Two immiscible liquids of different densities will form two distinct layer in the separators funnel.

We can run off the bottom layer (the liquid with greater density) to a separate vessel.

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20
Q

Describe the plum-pudding model

A

The atom is a ball of positive charge with negative elections embedded in it.

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21
Q

Describe the Bohr/nuclear model and how it came about

A

The nuclear model suggests that electron orbit the nucleus at specific distances (shells) - it came about from the alpha scattering experiments

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22
Q

Later experiments led to the discovery of smaller, positive particles in the nucleus; what are these particles called?

A

Protons

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23
Q

What did the work of James Chadwick provide evidence for?

A

The existence of neutrons in the nucleus

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24
Q

Describe the structure of an atom

A

The atom has a small central nucleus (made up of protons and neutrons) around which there are electrons

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25
Q

State the relative masses and relative charges of the proton, neutron and electron

A

Masses: 1, 1, very small ; Charges: 1, 0, -1 (respectively)

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26
Q

Explain why atoms are electrically neutral.

A

They have the same number of electrons and protons

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27
Q

What is the radius of an atom?

A

0.1 nm

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28
Q

What is the radius of a nucleus and what is it compared to that of an atom?

A

1 x 10^-14m and 1/10000

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29
Q

What name is given to the number of protons in the nucleus?

A

Atomic number

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30
Q

Atoms of the same elements have the same number of which particle in the nucleus?

A

Protons

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31
Q

Where is the majority of mass in an atom?

A

The nucleus

32
Q

What is the mass number?

A

The total number of protons and neutrons

33
Q

How does one calculate the number of neutrons using mass number and atomic number?

A

Subtract the atomic number from the mass number

34
Q

What is an isotope?

A

Atoms of the same element (same proton number) that have a different number of neutrons.

35
Q

Do isotopes of a certain element have the same chemical properties?

A

They have the same chemical properties as they have the same electronic structure

36
Q

What is the relative atomic mass?

A

The average mass value which takes the mass and abundance of isotopes of an element into account, on a scale where the mass of ^12C is 12.

37
Q

Give the electronic configurations of He (2), Be (4), F (9), Na (11), and Ca (20) to demonstrate how shells are occupied by electrons.

A

He, Be, F, Na, Ca configurations (respectively):

2 
2,2 
2,7
2,8,1 
2,8,8,2
38
Q

What are ions?

A

Ions are charged particles. They are formed when atoms loose electrons (positive ions) or gain (negative ions) electrons.

E.g. sodium positive ion, Na^+, has an electronic configuration of 2,8 (same as Ne). An atom of sodium has lost one electron.

39
Q

Compare the properties of metals and non-metals

A
40
Q

What is formed when a metal reacts with a non-metal?

A

An ionic compound (made of positive and negative ions).

41
Q

What is formed when a non-metal reaches with a non-metal?

A

A molecular compound containing covalently bonded atoms.

Atoms share electrons, as opposed to transferring electrons between each other (cf. ionic compounds).

42
Q

Explain what a solute and solution is

A

A solute is a substance that is dissolved in a solvent. Together, they form a solution.

43
Q

Explain what a miscible is

A

Miscible refers to the substances (particularly liquids) that mix together, e.g. water and alcohol. Water and oil immiscible, i.e. they do not mix.

44
Q

Explain what a soluble and a insoluble is

A

Soluble refers to the substance that can be dissolved in a solvent, e.g. salt in water. Insoluble substances won’t dissolve in a particular solvent.

45
Q

The columns of the periodic table are called?

A

Groups

46
Q

The cows of the periodic table are called?

A

Periods

47
Q

Are elements in the same group similar or different?

A

They may have similar chemical properties, as they have the same number of outer shell electrons.

48
Q

In terms of energy levels, what are the differences between elements of the same period?

A

They have the same number of energy levels

49
Q

Electrons occupy particular energy levels, with each electron in an atom at a particular energy level; which available energy level do electrons occupy?

A

The lowest available energy level

50
Q

The elements of Group 0 are more commonly known as?

A

The noble gases

51
Q

What makes the periodic table periodic?

A

Similar properties of elements occur at regular intervals

52
Q

Elements in the same group have the same number of electrons in their outer shell; what does this tell us about their chemical properties?

A

They have similar chemical properties

53
Q

In terms of shells, what is the difference between in the same period?

A

They have the same number shells

54
Q

What change in shell number is seen as one moves down a group?

A

The number of shells increases

55
Q

Early periodic tables were incomplete and elements were places in inappropriate groups if what was to be followed?

A

The strict order of atomic weights

56
Q

Knowledge of what made it possible to explain why the order based on atomic weights was not always correct?

A

Isotopes

57
Q

Mendeleev overcame some problems with the table by doing what? He also changed the order of some elements based on what?

A

Leaving gaps; atomic weights

58
Q

The majority of elements are?

A

Metals

59
Q

Elements that react to form positive ions are?

A

Metals

60
Q

Elements that do not form positive ions are?

A

Non-metals

61
Q

Elements in Group 1 are known as?

A

The alkali metals

62
Q

State three characteristics of the Alkali Metals

A

All have one electron in their outer shell; have low density; are stored under oil (to prevent reactions with oxygen or water); are soft (can be cut with knife).

63
Q

How do Group 1 elements react with non-metals? Why are these reactions similar for the different Group 1 elements?

A

They form ionic compounds which are soluble white solids which from colourless solutions - they all have one electron in their outer shell.

64
Q

How do Group 1 elements react with water?

A

They release hydrogen and form hydroxides which dissolve to form alkaline solutions; react vigorously with water fizzing and moving around on the surface of the water.

65
Q

How does reactivity change moving down Group 1? Why?

A

Reactivity increase as the atoms get larger and the distance between the nucleus and the outer electrons increases and thus attractions from the nucleus decreases, allowing them to more easily loose electrons.

66
Q

State five characteristics of Group 7

A
  • 7 electrons in outer shell
  • Coloured vapours
  • Diatomic molecules
  • Form ionic salts with metals
  • Form molecular compounds with non-metals
67
Q

State five State Group 7 elements and states of matter of molecules they form

A
  • Fluorine, F. F2 is a pale yellow gas.
  • Chlorine, Cl. Cl2 is a pale green gas.
  • Bromine, Br. Br2 is a dark brown liquid.
  • Iodine, I. I2 is a grey solid.
68
Q

State three changes that occur in Group 7 as one moves down the group

A
  • Higher relative molecular mass
  • Higher melting and boiling point
  • Less reactive - less easily gain electrons
69
Q

A more reactive halogen displaces a less reactive one from an aqueous solution of its salt; write the equations and state the colour change seen when chlorine reacts with sodium bromide and when chlorine/bromine reacts with sodium iodide.

A
70
Q

A more reactive halogen displaces a less reactive one from an aqueous solution of its salt; explain the trend in reactivity of halogens in these reactions

A

Reactivity decreases down the group. As we go down the group, the atoms get larger, so an incoming electron will be less tightly held by the attractive forces from the nucleus. That’s why Cl2 displaces Br- and I-.

71
Q

Compare group 1 metals with transition metals

A

Group 1 metals and transition metals are heat and electricity conductors. They are shiny when polished and form ionic compounds with non-metals.

Transition metals have higher densities and higher melting points than Group 1 metals. They have less reactive and harder than Group 1 metals.

72
Q

State three common characteristics of transition metals

A
  • Ions with different charges
  • Coloured compounds
  • Catalytic properties
73
Q

What is a catalyst?

A

A catalyst is a chemical substance that increases the rate of a chemical reaction.

It is not used up over the course of the reaction.

74
Q

State the colours of flames observed when lithium, sodium, and potassium burn in oxygen

A

Crimson-red, Li
Yellow-orange, Na
Lilac, K

75
Q

Describe the properties of noble gases. Discuss the trend in boiling point down the group.

A

Non-metals, gases, low boiling points, unreactive (full outer shell; they don’t easily accept or lose electrons).

The boiling point increases down the group, as the atoms get heavier.

AQA Chemistry Paper 1: Combined Science (5 decks)

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