C4

Question 1

what are group 1 elements known as?

Answer 1

Alkali metals

Question 2

what 4 properties do group 1 elements have?

Answer 2

-low densities
-soft
-low melting and boiling points
-very reactive

Question 3

why are alkali metals very reactive?

Answer 3

they have 1 electron in their outer shell, they easily from a full outer shell by losing it

Question 4

does reactivity increase or decrease going down the group for alkali metals and why?

Answer 4

increases, the number of electron shells increases which means the attraction to the nucleus decreases

Question 5

what is produced when an alkali metal reacts with water?

Answer 5

hydrogen gas + metal oxide

Question 6

what do alkali metals form with non metals?

Answer 6

an ionic compound

Question 7

what is produced when an alkali metal reacts with oxygen?

Answer 7

metal oxide

Question 8

what are group 7 elements known as?

Answer 8

halogens

Question 9

how many electrons do group 7 elements have in their outer shell?

Answer 9

7

Question 10

what are the 2 properties of halogens?

Answer 10

-gases at room temp (only the top of group 7)
-solids at room temp (only the bottom of group 7)

Question 11

do the melting and boiling points of halogens decrease or increase as you go down the group and why?

Answer 11

increase with increasing relative atomic mass. larger atoms have stronger intermolecular forces so more energy is needed to turn it into a gas.

Question 12

does the reactivity in halogens increase or decrease as you go down the group and why?

Answer 12

decrease. halogens gain one electron for a full outer shell, it’s harder down the group because the number of shells decrease, it’s harder to gain an electron because it’s less attached to the positive nucleus.

Question 13

what do halogens and non metals form?

Answer 13

molecular compounds, they share electrons (covalent bond)

Question 14

what do halogens form when reacting with metals?

Answer 14

ionic compounds

Question 15

what is group 0 also known as?

Answer 15

nobel gases

Question 16

what are nobel gases at room temp?

Answer 16

colourless gases

Question 17

does the melting point of noble gases increase or decrease as you go down the group?

Answer 17

increase with increasing relative atomic mass. larger atoms have stronger intermolecular forces between them, they need more energy to overcome the forces and turn into a gas.

Question 18

how do you test for carbon dioxide?

Answer 18

bubble it through limewater, if carbon dioxide is present then the limewater will turn cloudy

Question 19

how do you test for oxygen?

Answer 19

a glowing splint will relight when exposed to oxygen. place a glowing splint in a test tube of oxygen and the splint will relight

Question 20

how do you test for hydrogen?

Answer 20

put a lit splint in a test tube of hydrogen and there will be a squeaky pop sound that tells you that hydrogen is present

Question 21

how do you test for chlorine?

Answer 21

expose it to damp litmus paper.

Question 22

why are noble gases inert?

Answer 22

they exist as single atoms, they don’t easily form a molecule. they have a full outer shell (stable)

Question 23

does the melting point of noble gases increase or decrease as you go down the group?

Answer 23

increase with increasing relative atomic mass. larger atoms have stronger intermolecular forces between them, they need more energy to overcome the forces and turn into a gas.

Question 24

how do you test for hydrogen?

Answer 24

put a lit splint in a test tube of hydrogen and there will be a squeaky pop sound that tells you that hydrogen is present

Question 25

Which factor determines the reactivity of a metal?

Answer 25

How easily the atoms of that element lose their outer electrons

Question 26

what is the order of the reactivity series?

Answer 26

please- potassium send- sodium crazy-calcium monkeys-magnesium and- alluminium crazy- carbon zebras-zinc in-iron to-tin hot-hydrogen countries-copper signed-sulfur gordon- gold p-platinum

Question 27

what colour is fluorine at room temp?

Answer 27

yellow gas

Question 28

what colour is chorine at room temp?

Answer 28

green gas

Question 29

what colour is bromine at room temp?

Answer 29

red-brown liquid

Question 30

what colour is iodine at room temp?

Answer 30

grey solid

Question 31

when alkali metals are put in water what is produced?

Answer 31

hydrogen gas and metal hydroxides

Question 32

what do alkali metals form when they react with non metals?

Answer 32

ionic compounds

Question 33

when alkalis react with oxygen what do they form?

Answer 33

metal oxides

Question 34

what are halogens?

Answer 34

non-metals

Question 35

the halogens at the top of the group 7 are what at room temperature?

Answer 35

gases at room temperature

Question 36

what are halogens at the bottom of group 7 at room temperature?

Answer 36

solids at room temperature

Question 37

why does boiling and melting point increase as you go down group 7?

Answer 37

the larger atoms have stronger intermolecular forces between them this means they need more energy to overcome their forces

Question 38

what do halogens form with other non metals?

Answer 38

molecular compounds (they also form a covalent bond)

Question 39

when halogens react with metals what do they form?

Answer 39

ionic compounds

Question 40

when halogens react with metals what do they form?

Answer 40

ionic compounds

Question 41

A more reactive halogen can...

Answer 41

displace a less reactive one

Question 42

how can displacement reactions be recognised?

Answer 42

by a colour change

Question 43

what are nobel gases known as?

Answer 43

-unreactive -colourless gases at room temperature

Question 44

why are nobel gases unreactive?

Answer 44

they have a full outer shell of electrons

Question 45

the melting and boiling points of noble gases...

Answer 45

increase as you go down the group

Question 46

why do noble gases melting and boiling points increase down the group?

Answer 46

larger atoms have stronger intermolecular forces, so they require more energy to break their bonds