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Chemistry AQA Gcse > C2-the Periodic Table > Flashcards

C2-the Periodic Table Flashcards

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1
Q

What is an alkali metal?

A

elements in Group 1 of the periodic table

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2
Q

What are halogens?

A

elements in Group 7 of the periodic table

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3
Q

What is a transition element?

A

elements form the central block of the periodic table

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4
Q

What is universal indicator?

A

a mixture of indicators that can change colour through a range of colours to show how strongly acidic or alkaline liquids and solutions are

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5
Q

What are the noble gases?

A

Elements in group 0

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6
Q

How are elements arranged in the periodic table?

A

Elements are arranged in vertical groups and horizontal periods

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7
Q

Why is it called the periodic table?

A

Because similar properties occur at regular intervals

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8
Q

What do elements in the same group have in common?

A

They have the same number of electrons in the valence shell and this gives them similar chemical properties

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9
Q

Elements that react to form positive ions (lose electrons) are…

A

Metals

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10
Q

alkali metals are ………… at room temperature

A

soft solids

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11
Q

alkali metals are extremely ……….

A

reactive

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12
Q

alkali metals have …….. densities

A

low

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13
Q

alkali metals have …….. melting and boiling points

A

low

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14
Q

alkali metals have melting and boiling points that ………. as you go down the group

A

decrease

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15
Q

alkali metals need to be kept in oil because………

A

They react with oxygen

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16
Q

reactivity ………. as you go down the alkali metals

A

increases

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17
Q

Why are alkali metals reactive?

A

they only have 1 electron in their outer shell and therefore only need to lose 1 electron to have a stable outer shell

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18
Q

density ……….. as you go down the alkali metals

A

increases

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19
Q

give the balanced chemical equation for Lithium reacting with Oxygen (lithium Oxide)

A

4Li(s) + O₂(g) -> 2Li₂O(s)

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20
Q

give the balanced chemical equation for Sodium reacting with Oxygen (Sodium Oxide)

A

4Na(s) + O₂(g) -> 2Na₂O(s)

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21
Q

give the balanced chemical equation for Potassium reacting with Oxygen (Potassium Oxide)

A

4K(s) + O₂(g) -> 2K₂O(s)

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22
Q

give the balanced chemical equation for Lithium reacting with Water (Lithium Hydroxide)

A

2Li(s) + 2H₂O(l) -> 2LiOH(aq) + H₂(g)

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23
Q

give the balanced chemical equation for Sodium reacting with Water (Sodium Hydroxide)

A

2Na(s) + 2H₂O(l) -> 2NaOH(aq) + H₂(g)

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24
Q

give the balanced chemical equation for Potassium reacting with Water (Potassium Hydroxide)

A

2K(s) + 2H₂O(l) -> 2KOH(aq) + H₂(g)

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25
Q

give the balanced chemical equation for Sodium reacting with Chlorine (Sodium Chloride)

A

2Na(s) + Cl₂(g) -> 2NaCl(s)

26
Q

give the balanced chemical equation for Potassium reacting with Chlorine (Potassium Chloride)

A

2K(s) + Cl₂(g) -> 2KCl(s)

27
Q

give the balanced chemical equation for Lithium reacting with Chlorine (Lithium Chloride)

A

2Li(s) + Cl₂(g) -> 2LiCl(s)

28
Q

What does effervescence mean?

A

Bubble/fizz

29
Q

What are the observations of when Lithium reacts with water?

A

it floated on the water and effervescence releasing a gas, as it is an alkali it turned the universal indicator purple

30
Q

What are the observations of when Sodium reacts with water?

A

it floated on the water and effervescence releasing a gas, as it is an alkali it turned the universal indicator purple

31
Q

What are the observations of when Potassium reacts with water?

A

it floated on the water and burnt with a pink flame before exploding, as it is an alkali it turned the universal indicator purple

32
Q

What are the observations of when Lithium reacts with oxygen?

A

Burns with a red flame to form a white powder

33
Q

What are the observations of when Sodium reacts with oxygen?

A

Burns with a yellow/orange flame to form a white powder

34
Q

What are the observations of when Potassium reacts with oxygen?

A

Burns with a lilac flame to form a white powder

35
Q

what are some physical properties of group 7 elements?

A

poor conductors of heat and electricity, they are brittle and dull

36
Q

melting and boiling points ………….. as you go down the halogens

A

Increase

37
Q

reactivity …………….. as you go down the halogens

A

decreases

38
Q

Why does reactivity decrease going down the halogens?

A

Halogens gain electrons to from ions. As you go down the group the atomic radius increases and the electron shielding increases, this outweighs the increased nuclear charge, therefore the attraction of the nucleus on the electron it is gaining decreases making it harder to gain.

39
Q

all halogens have … electrons in the valence shell

A

7

40
Q

a more reactive halogen is able to displace a less reactive halogen from…

A

An aqueous solution of a halide compound

41
Q

Why does reactivity increase going down the alkali metals?

A

Alkali metals lose electrons to from ions. As you go down the group the atomic radius increases and the electron shielding increases, therefore the attraction of the nucleus on the electron it is losing decreases making it easier to lose

42
Q

Transition metals are good conductors of ……………………..

A

heat and electricity

43
Q

Transition metals have ………. densities

A

High

44
Q

Transition metals have …….. melting points

A

High

45
Q

Transition metals are much ……. reactive than Alkali Metals

A

Less

46
Q

What colour are compounds of transition elements?

A

Brightly Coloured

47
Q

What metals are often used as catalysts?

A

Transition metals

48
Q

Transition elements form more than 1 type of ……..

A

Ion

49
Q

What is the balanced symbol equation for when chlorine water is added to an aqueous solution of potassium bromide?

A

Cl₂(aq) + 2KBr(aq) -> 2KCl (aq) + Br₂(aq)

50
Q

What is the balanced symbol equation for when chlorine water is added to an aqueous solution of potassium Iodide?

A

Cl₂(aq) + 2KI(aq) -> 2KCl (aq) + I₂(aq)

51
Q

What is the balanced symbol equation for when Bromine water is added to an aqueous solution of potassium Iodide?

A

Br₂(aq) + 2KI(aq) -> 2KBr (aq) + I₂(aq)

52
Q

What are some observations of when chlorine water is added to an aqueous solution of potassium Bromide?

A

Changes from a colourless solution to a yellow solution

53
Q

What are some observations of when chlorine water is added to an aqueous solution of potassium Iodide?

A

Changes from a colourless solution to a red-brown solution

54
Q

What are some observations of when Bromine water is added to an aqueous solution of potassium Iodide?

A

Changes from a yellow solution to an orange solution

55
Q

Why are noble gases not reactive

A

They have a full outer shell which makes them very stable.

56
Q

What was John Newlands periodic table and when did he make it

A

John Newlands created his periodic table in 1864 and organised the elements in ascending relative atomic mass. He realised every 8 elements had similar properties so he started a new column every 8 elements so columns had similar properties. This worked up to calcium but then broke down so it was not accepted at the time.

57
Q

What was Mendeleevs periodic table and when did he make it

A

Mendeleev created his periodic table in 1869. It was the same as Newlands except he left gaps where he expected undiscovered elements to go causing elements with similar properties to be in the same column. This did not always work and some elements had to be moved to fit their chemical properties.

58
Q

What was Moseley’s periodic table and when did he make it

A

Moseley arranged the periodic table by proton number rather than relative atomic mass. This fixed the flaws in the periodic table. He also left gaps for undiscovered elements.

59
Q

How does melting point change down the alkali metals?

A

Melting point decreases down the group

60
Q

How does melting point change down the halogens?

A

Increases down the group

61
Q

Describe the reaction between an alkali and a halogen:

A

Vigorous reaction
* Produce a white solid

Chemistry AQA Gcse (2 decks)

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