topic 4

Question 1

what are the properties of the group 1 metals?

Answer 1

they’re soft and they have low melting points

Question 2

why are group 1 metals different to other metals?

Answer 2

they have low melting points compared with other metals and they are very soft (can be cut with a knife)

Question 3

do group 1 elements react vigorously in water?

Answer 3

yes

Question 4

what happens as you go down group 1?

Answer 4

the attraction between the positively charged nucleus and the negatively charged electron decreases which means the electron is easier to get rid of

Question 5

the elements further down group 1 are…

Answer 5

more reactive

Question 6

do elements get more reactive as the atomic number increases?

Answer 6

yes

Question 7

what are the group 1 metals called?

Answer 7

alkali metals

Question 8

what does a reaction with water and an alkali metal produce?

Answer 8

hydrogen gas

Question 9

what causes fizzing to take place in a reaction

Answer 9

water reacting with the alkali metal producing hydrogen

Question 10

what experiment can you do to show whether hydrogen is present?

Answer 10

a lighted splint which will make a “squeaky pop” sound as the hydrogen ignites

Question 11

what are the group 7 elements known as?

Answer 11

the halogens

Question 12

how many electrons do the happens have in there outer shell?

Answer 12

7

Question 13

when halogens react with metals what do they form?

Answer 13

metal halides

Question 14

is a metal halide a salt?

Answer 14

yes

Question 15

will more or less reactive halogens replace more or less reactive ones?

Answer 15

more reactive halogens will displace the less reactive one

Question 16

the more reactive halogens are higher/lower

Answer 16

higher

Question 17

why are halogens higher up group 7 more reactive?

Answer 17

there outer shell is closer to the nucleus so the pull from the positive nucleus is greater which attracts more electrons more strongly

Question 18

what happens when ha life’s dissolve in water?

Answer 18

the halide ions are free to react

Question 19

what is a displacement reaction?

Answer 19

when a more reactive halogens reacts with a solution that contains halide ions which will “push out” (displace) the less reactive halogen

Question 20

give an example of a displacement reaction

Answer 20

chlorine is more reactive than iodine ( it’s higher up group 7). therefore, chlorine reacts with potassium iodine to form potassium chloride and iodine

Question 21

what are group 0 elements called?

Answer 21

the Nobel gases

Question 22

do Nobel gases react with a lot?why?

Answer 22

no because they have a full outer shell so they aren’t desperate to gain or loose electrons

Question 23

are the Nobel gases flammable?why?

Answer 23

no because they are inert

Question 24

what is argon used for? (Nobel gases)

Answer 24

to provide an inert atmosphere in filament lamps because Nobel gases are non-flammable so it stops the very hot filament from brining away

Question 25

why is a use of helium? (Nobel gas)

Answer 25

it is used in airships and party balloons as helium has a lower dentistry than air so it makes the balloon float

Question 26

what is a pattern in the properties of the Nobel gases?

Answer 26

as you move down the group the boiling points and densities increase