group 1 and 7 (paper 1)

Question 1

what happens when you go down group 1?

Answer 1

becomes more reactive

Question 2

how many electrons do group 1 elements have in their outer shell?

Answer 2

1

Question 3

give the name for group 1

Answer 3

alkali metals

Question 4

list 5 physical properties of group 1 metals

Answer 4

• soft
• very reactive
• fizz
• float
• low melting points

Question 5

which group 1 metals float on water?

Answer 5

lithium
sodium
potassium

Question 6

define a displacement reaction

Answer 6

a more reactive halogen will displace a less reactive halogen from a solution of its compound

Question 7

what is the name for group 7?

Answer 7

halogens

Question 8

what happens as you go down group 7?

Answer 8

become less reactive

Question 9

define a redox

Answer 9

oxidation and reduction occurring at the same time in a reaction

Question 10

define oxidation

Answer 10

when a substance gains oxygen or loses electrons

Question 11

define reduction

Answer 11

when a substance loses oxygen

Question 12

what does OIL RIG stand for?

Answer 12

• oxidation is loss (of e)
• reduction is gain (of e)

Question 13

what colour and state is bromine and what vapour does it give off at room temperature?

Answer 13

• red-brown liquid
• orange vapour at room temperature

Question 13

what colour and state is iodine and what vapour does it give off when heated?

Answer 13

• dark grey crystalline solid
• purple vapour when heated

Question 14

colour of chlorine water in potassium bromide solution

Answer 14

colourless to orange

Question 15

colour of bromine water in potassium iodide solution

Answer 15

orange to brown

Question 16

what is the word equation for a group 1 element reacting with water

Answer 16

metal + water -> metal hydroxide + hydrogen

Question 17

what is the chemical equation for a group 1 reacting with water (lithium)

Answer 17

2Li(s) + 2H2O(l) -> 2LiOH(aq) + H2(g)

Question 18

what is the word equation for a group 1 reacting with oxygen

Answer 18

metal + oxygen -> metal oxide

Question 19

what is the chemical equation for a group 1 reacting with oxygen (lithium)

Answer 19

4Li(s) + O2(g) -> 2Li2O(s)

Question 20

does lithium form anything other than lithium oxide when reacting with oxygen

Answer 20

no

Question 21

does sodium form anything other than sodium oxide when reacting with oxygen

Answer 21

yes - sodium peroxide

Question 22

what would you observe when lithium reacts with water

Answer 22

fizzes
moves on surface of water
floats
universal indicator turns blue

Question 23

what would you observe when sodium reacts with water

Answer 23

melts into a ball
moves quick on surface of water
fizzes
universal indicator turns blue

Question 24

what would you observe when potassium reacts with water

Answer 24

purple flame
explodes
forms a ball
floats
universal indicator turns blue

Question 25

describe chlorines physical state at room temperature

Answer 25

green gas

Question 26

describe bromines physical state at room temperature

Answer 26

red-brown liquid with orange vapour

Question 27

describe fluorines physical state at room temperature

Answer 27

pale yellow gas

Question 28

describe iodines physical state at room temperature

Answer 28

dark gray solid which sublimes to a purple vapour