Exam 2 REVISON

Question 1

What is identical for each isotope

Answer 1

Number of protons and electrons

Question 2

Some properties of organic compounds include

Answer 2

• Decolourises red- brown coloured bromine water.
• Reacts with reactive metals
• Can be used as a monomer in polymerisation reactions.

Question 3

What applies to transition metals but not to the main group metals

Answer 3

Transition metals form compounds which are often coloured.

Question 4

Isomers of a compound have

Answer 4

Similar chemical properties and same molecular formula

Question 5

If Insufficient ammonia had been used in a combustion reaction what would not be affected

Answer 5

Number of Copper ions in the reaction tube

Question 6

Which one of the group 16 hydrides has the lowest boiling point?

Answer 6

Water

Question 7

What best explains why the melting point of one group 16 hydride is higher than melting points of all other hydrides.

Answer 7

Larger Molecules always have stronger intermolecular bonds than smaller ones

Question 8

10ml sample of a acid has a pH of 3 . The sample was diluted with water to give final Vol of 1.0L. The pH of the diluted solution

Answer 8

0.03

Question 9

It can be concluded that in a methanoic acid solution

Answer 9

Is a weak acid because the solute is partially ionised to produce COO ^2- ions

Question 10

Which property of water is most Influenced by the value of the latent heat of vaporisation.

Answer 10

Ability to act as a solvent

Question 11

How many mole of a Strong Diprotic acid would be required to neutralise 1 mole of the weak base ammonia (NH3)

Answer 11

2.0 Mole

Question 12

What would Increase the concentration of the potassium nitrate solution in the test tube

Answer 12

Increasing the temp of the solution.

Question 13

Structure and bonding in MgCl

Answer 13

The structure of MgCL involves a regular arrangement of Mg cations and Cl anions. Magnesium Chloride is an ionic lattice, held together by electrostatic forces between the cations and anions.
This creates a very high boiling point. This creates a very high boiling point. The bound is created by one magnesium atom giving 2 electrons to 2 chlorine atoms to achieve full outer shells.

Question 14

What happens to Mg particles in molten MgCl in order to produce Mg metal

Answer 14

Magnesium ions gain electrons.

Question 15

Solid CaCL mixed with MgCl to lower its melting temp.

Why is this an advantage in the industrial production of Mg metal.

Answer 15

Takes less heat energy to retrieve the magnesium metal. Draw the dot diagrams

Question 16

Is Carbon dioxide molecule Polar or Non Polar

Answer 16

Co2 is non polar as there is symmetry in the molecule. Although the bonds are polar, the overall dipoles cancel out due to the symmetry.

Question 17

Why is Carbon- 12 selected as the standard used for determination of the Relative Atomic Masses.

Answer 17

Because it is a stable and abundant isotope.

Question 18

Write a balanced chemical equation, including states, which represents the formation of magnesium metal from magnesium chloride.

Answer 18

MgCl2 (l) -> Mg (s) + Cl2 (g)

Question 19

Cu2S (l) + 02 (g) -> 2Cu (l) + So2 (g)

Calculate the mass of copper in g present in 1.00 tonne of Cu2S (1 tonne 10^6g)

Answer 19

Cu2S = 159.1 mol
127 divided 159.1 = 0.798
= 0.785 x 10^ 6 =
798240.1 g

Question 20

Why will carbon dioxide not conduct electricity

Answer 20

Carbon dioxide will not conduct electricity as it is a covalent molecular molecule. All covalent molecular molecules do not conduct electricity, as they are gases at room temp, and gases cannot conduct electricity

Question 21

Is Carbon dioxide molecular polar or non polar?

Answer 21

Carbon dioxide in non polar because the electronegativity of the oxygen atoms cancel out and there are dipole dipole intermolecular forces.

Question 22

Polypropene is a linear polymer. Describe intermolecular and intramolecular.

Answer 22

The intermolecular bonding is the weak dispersion forces holding the polymer together and the intramolecular bonding is the covalent bonding where all the non - metals share their electrons together

Question 23

In the production of polymer products, the starting material found below ground level is

Answer 23

Crude Oil

Question 24

One Environmental issue associated with Iron

Answer 24

Mining operation companies are a problem for the environment as the fumes in the machinery contribute to the green house effect. The So2 is brought into the atmosphere, destroying the ozone layer