Past Pape Q

Question 1

What happens when non metals react airhead oxygen

Answer 1

Form acidic oxides

Question 2

What happens when transition metals react with oxygen

Answer 2

Form alkaline metal oxides

They are very basic, and form strong alkalis when dissolved in water

Question 3

What are the limitations of showing a compound as a 3D space filling model?

Answer 3

It does not show how many electrons are in a bond.

Question 4

How is structure of grapheme different from graphite

Answer 4

Graphed has one layer and graphite has many layers

Question 5

How does the scientist obtain pure dry magnesium sulfate crystals from magnesium sulfate
solution?

Answer 5

Crystallisation

Question 6

Describe what happens to the movement and arrangement of the particles when a
solid turns into a gas. Use the particle model.

Answer 6

-> particles move faster in a gas than in a solid
-> particles havw more energy in a gas
-> particles are further assort in a gas than in a solid
-> Particles are arranged randomly in a gas, but in regular rows in solids

Question 7

Properties of polymers

Answer 7

-> low melting point
-> flexible
-> insulators

Question 8

Explain why polymers without cross-links can stretch more than polymers with cross-links.

Answer 8

-> polymer chains without cross-links can slide or move over each other

-> The intermolecular forces holding polymer chains together are weaker than cross-links

Question 9

Magnesium nitrate decomposes when heated to form magnesium oxide.
2Mg(NO3)2 —> 2MgO + 4NO2 + O2

(a) (i) Calculate the mass of oxygen made when 0.45 moles of magnesium nitrate decomposes.
Relative atomic mass (Ar): O = 16.0.

Answer 9

7.2

Question 10

Explain why magnesium forms Mg2+ ions.

Answer 10

Looses two electron to form full outer shell