Atomic Structure

Question 1

Soluble in water and insoluble in water make two lists.

Answer 1

Soluble in water:
All group 1 compounds
All nitrate compounds
All ammonium compounds

Insoluble in water
Ag+,Pb2+ chlorides
Ba2+, Pb2+ Sulfates
Most hydroxides
Most carbonates

Question 2

Water is covalent molecule so…

Answer 2

It doesn’t have ions

Question 3

Write an ionic equation, with state symbols, to show the reaction of calcium with an excess of water.

Answer 3

Ca(s)+ 2H2O(l) Ca2+(aq) + 2OH–(aq) + H2(g)

Question 5

What block is nickel in on the periodic table?

Answer 5

D Block

Question 6

Explain in terms of structure and bonding why nickel has a high melting point

Answer 6

Contains pestive metal iron or protons or nuclei and delocalised electrons
Strong attraction between them

Question 7

State the element in period 3 that has the highest melting point, explain your answer.

Answer 7

Silicon
Has covalent bonds so lots of energy is required to break the covalent bonds