Alkali metals.

Question 1

Where are the alkali metals?

Answer 1

In group 1 of the periodic table

Question 2

What do the alkali metals have in common?

Answer 2

They all have one electron in their outer shell

Question 3

How do you identify the alkali metals using the flame test?

Answer 3

Some of the metals will change the colour of the flame

Question 4

What is an example of an oxidation reaction?

Answer 4

Alkali metal and oxygen

Question 5

What would an alkali metal + oxygen make?

Answer 5

Alkali metal oxide

Question 6

When you go down group one does the reactivity increase or decrease?

Answer 6

It increases.

Question 7

How do elements in group one react?

Answer 7

it gives away its outer electron

Question 8

why would the reactivity increase as you go down group one?

Answer 8

the nucleus holds on to the electrons so since there are more electrons in an element as you go down group the outer electron is less tightly held as it is further from the nucleus.

Question 9

what does alkali metal + water make?

Answer 9

alkali metal hydroxide + hydrogen

Question 10

when doing the flame test, what colour will the flame be with lithium?

Answer 10

red

Question 11

when doing the flame test, what colour will the flame be with sodium?

Answer 11

yellow

Question 12

when doing the flame test, what colour will the flame be with potassium

Answer 12

lilac

Question 13

what happens when you put lithium in water?

Answer 13

it bubbles and fizzes around

Question 14

what happens when you put sodium in water?

Answer 14

fizzes, gives off heat and can explode

Question 15

what happens when you put potassium in water?

Answer 15

it moves around the surface of the water quick and it ignites which also ignites hydrogen gas, then sparks and a lilac flame appear

Question 16

if ui goes from green to purple during the reaction as a metal hydroxide forms, what would this tell you about the metal hydroxide’s pH?

Answer 16

it is high

Question 17

How do you know when hydrogen is produced from a reaction making a metal hydroxide?

Answer 17

the hydrogen will cause bubbling during the reaction

Question 18

do the alkali metals have a high or low melting point?

Answer 18

they have the lowest melting points of any nongaseous group in the periodic table

Question 19

how can you describe the trend in melting and boiling point in group one?

Answer 19

they both decrease as you go down the group

Question 20

why are alkali metals stored in oil?

Answer 20

to minimise contact with oxygen or water as it reacts vigorously with these two

Question 21

why do the alkali metals react in a similar way?

Answer 21

since they all have one outer electron, they all have similar chemical properties

Question 22

can you name two properties of alkali metals?

Answer 22

good conductors of heat, good conductors of electricity

Question 23

name a trend the elements in group one have?

Answer 23

they get softer as you go down the group

Question 24

what are alkali metals used for?

Answer 24

can be used to make batteries, air purification and aluminium production