N

Question 2

group one metals

Answer 2

-alkali metals found in group one of the periodic table
-gain electrons to get a full outer shell

Question 3

properties of group one metals

Answer 3

-soft
-have low density
-low melting point

Question 4

reactivity trend of group one metals

Answer 4

-amount of shells increase down group
-atomic distance between nuclei and electron is weaker

Question 5

melting point and boiling

Answer 5

decrease down the group

Question 6

alkali metal +water

Answer 6

metal hydroxide + hydrogen in form of flames

Question 7

alkali + oxygen reaction

Answer 7

metal oxides e.g. LiO2

Question 8

group 7 halogens

Answer 8

fluorine
chlorine
bromine
iodine

Question 9

flourine properties

Answer 9

-yellow gas
-most reactive as top of group

Question 10

chlorine

Answer 10

-poisionus green gas at room temp

Question 11

bromine

Answer 11

poisonous orange liquid at room temp

Question 12

iodine

Answer 12

-grey solid
least reactive

Question 13

diatomic molecules

Answer 13

-each halogen forms a covelant bond

Question 14

halide

Answer 14

-when a halogen gains an electron

Question 15

displacement reactions

Answer 15

when a more reactive element displaces a less reactive element

Question 16

magnesium combustion

Answer 16

-burns with bright white
flame

-forms magnesium oxide powder- when dissolved in water, turns to alkaline

Question 17

hydrogen combustion

Answer 17

-burns easily, produces pale blue flame when burnt
-forms water vapour

Question 18

sulfur combustion

Answer 18

-burns with pale blue flame
produces sulphur dioxide> acidic when burnt in water

Question 19

thermal decompostition

Answer 19

the breakdown of something using heat