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Introduction to chemistry

2.1 Define the mole, and use this concept to carry out simple calculations involving mass and the concentration of solutions.
The mole has not been defined to an acceptable standard. You will need to clearer reference to Avagadro’s constant (and carbon 12) as part of the account. You have correctly determined molar calculations for questions a) i, and a) ii, but your calculation for b) i and b) ii are incorrect and need to be readdressed. You also need to show the working out for each value stated.

4.1. Relate the properties of a material to its structure.
You have provided an unsatisfactory overall response to the demands of the assessment criteria here. Your explanations for sodium and potassium chloride are weak, lacking in the detail required to meet the demands of the TAQ. For sodium specifically you need to explain how its structure and metallic bonding promotes softness and malleability (with reference to its typical ‘sea of delocalised electrons) and account more clearly for the low melting / boiling point. You also need to address the specific properties that gives sodium electrical conductivity. With regard to potassium chloride you have not addressed its solubility or explained what happens to the electrons when it is melted or dissolved in order to give it electrical conductivity. There is also no reference to the properties that give this substance a high melting point. Your description for the properties of diamond lacks detail, you need to provided clear reference to it being a giant lattice structure with the ability of carbon to make strong covalent bonds with four other atoms. Finally, your explanation for the low melting and boiling point of Methane correctly refers to its weak intermolecular forces but you could have been more specific by referring to these as Van Der Waals forces.

5.1. Explain data about simple molecular compounds in terms of intermolecular forces.
You have not accounted for the low melting point for any of the molecules specifically. Why does propane have the lowest value of the three, and why is the melting point of ethanol higher than that of chloromethane? In each case, reference needs to be given to named intermolecular bonding characteristics.
6.1. Predict shapes of simple molecules.
You need to include bond angles for each simple molecule that you have sketched



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