chemistry specification part 1

Question 1

why are some metals classified as alkali

Answer 1

alkali metals all have one outer shell electron so they have similar chemical properties.All group1 metals

Question 2

what are two properties of alkali metals

Answer 2

very soft
low melting point

Question 3

how will alkali metals react with water

Answer 3

will react vigorously and produce hydrogen gas and a hydroxide of that metal
e.g sodium+water–> sodium hydroxide+hydrogen

Question 4

how does lithium react with water

Answer 4

lithium will move around the surface and fizz vigourously

Question 5

how do sodium and potassium react in water

Answer 5

both react and move around the surface and fizz. Additionally, they will melt from the heat of the reaction. Potassium gets hot enough to ignite the hydrogen gas being produced.

Question 6

what is the trend in group 1

Answer 6

the elements get more reactive as you go down

Question 7

what colour and physical state is chlorine?

Answer 7

fairly reactive,poisonous and green gas

Question 8

what colour and physical state is bromine?

Answer 8

poisonous,red-brown liquid which gives an orange vapour when at room temp

Question 9

what colour and physical state is iodine?

Answer 9

dark grey crystalline solid which gives off purple vapour when heated

Question 10

how can you predict the physical properties of halogens further down the group?

Answer 10

the colour gets darker and the melting point increases so you can predict that astatine (below iodine) is a dark-coloured solid

Question 11

complete the sentence:
halogens higher up in group 7 are…

Answer 11

more reactive and attract the outer electron more easily