C4.1

Question 1

Dobereiner 1829

Answer 1

Triplets or triads of elements seemed to exist,with similar properties

Question 2

Newlands-1866

Answer 2

Proposes patterns between elements

He used an ‘octave’ pattern,which showed every eighth element to be similar

Question 3

Mendeleev 1871

Answer 3

Published his version of the periodic table
This made predictions about the properties and mass of yet discovered elements. He left gaps in his table to be filled when they were found

Question 4

Mendeleev’s rules

Answer 4

1) out elements in order of their relative atomic mass

2) put elements that are chemically similar in the same group (column)

Question 5

2 elements Mendeleev predicted to exist

Answer 5

Gallium - 1875

Germanium- 1886

Question 6

Chlorine(g) - room temp

Answer 6

Pale green

Question 7

Bromine(l) - room temp

Answer 7

Dark brown

Question 8

Iodine (s) - room temp

Answer 8

Dark grey solid

Question 9

Bromine when a gas

Answer 9

Dark brown

Question 10

Iodine when heated

Answer 10

Purple has

Question 11

Alkali metals react with water to form what?

Answer 11

Hydrogen and an alkaline solution of a hydroxide with the formula MOH

Question 12

Alkali metals react vigorously with what? To form what?

Answer 12

With chlorine to form colourless,crystalline salts with the formula MCl

Question 13

Atoms of each element have different what?

Answer 13

Proton numbers

Question 14

What does arranging the elements in order of their proton number give?

Answer 14

Repeating patterns in the properties of elements

Question 15

As you go down the group the melting and boiling point get….
The density is …..
(Group 1)

Answer 15

Lower as you go down the group

Density = low

Question 16

Lithium when reacts with water

Answer 16

Fizzes slowly,water turns purple

Question 17

Sodium when reacts with water

Answer 17

Fizzes faster,water turns purple

Question 18

Potassium when reacts with water

Answer 18

Fizzes a lot,water turns purple

Question 19

As you go down the group… reactivity of alkali metals?

Answer 19

Become more reactive

Question 20

What are alkali metals stored in?

Answer 20

Oil

Question 21

Handling alkalis

Answer 21

Forceps not hands (sweat-scar-rage)
Kept away from large amounts of water
Goggles

Question 22

Chlorine (g) at room temp

Answer 22

Pale green

Question 23

Bromine (l) at room temp

Answer 23

Dark brown

Question 24

Bromine (l) when a gas

Answer 24

Dark brown

Question 25

Iodine (s) at room temp

Answer 25

Dark grey solid

Question 26

Iodine (s) when a gas

Answer 26

Purple

Question 27

Halogens consist of what?

Answer 27

Diatomic molecules

Question 28

Halogens- melt and boiling point

Answer 28

High

Question 29

As you descend the group,the group 7 elements become…(reactive)

Answer 29

Less reactive

Question 30

Halogens-reaction with potassium chloride solution

Answer 30

No reaction

Question 31

Chlorine water- reaction with potassium bromide solution

Answer 31

Yellow/orange colour of bromide appears

Question 32

Bromine reaction with potassium bromide

Answer 32

No reaction

Question 33

Iodine reaction with potassium bromide

Answer 33

No reaction

Question 34

Chlorine water reaction with potassium iodide solution

Answer 34

Brown colour of iodine appears

Question 35

Bromine water reaction with potassium iodide solution

Answer 35

Colour darkens from yellow/orange to brown

Question 36

Iodine solution reaction with potassium iodine solution

Answer 36

No reaction

Question 37

Fine cupboard-storing halogens

Answer 37

Any fumes released into air are sucked up into this and then are filtered to remove harmful chemicals
Let out= air
Keeps scientists safe