alkali metals

Question 1

physical properties of alkali metals:

Answer 1

are silver/grey
are soft
have a low density
low melting and boiling point

Question 2

what does lithium + water =

Answer 2

lithium hydroxide + hydrogen

Question 3

what does sodium + water =

Answer 3

sodium hydroxide + hydrogen

Question 4

reactions w water

lithium

Answer 4

fizzes & bubbles
floats on the water
water turns purple

Question 5

reactions w water

sodium

Answer 5

melts into a ball then fizzes
moves faster on the water
water turns purple

Question 6

reactions w water

potassium

Answer 6

fizzes vigorously & gives of sparks
hydrogen burns with a lilac flame
water turns purple

Question 7

the pattern in electronic configuration:

Answer 7

as you go down the group the atom size increases at the same time the reactivity increases

the more shells the atom has the further the outer shell electron from the nucleus

Question 8

how can you tell if an alkaline is strong?

Answer 8

the hydroxides formed dissolve in water to form alkaline solutions
- they turn universal indicator purple