Home > Subjects > Chemistry > Level 3 > 3.4 Particles and thermochemical properties > Key tips
- Subject: Chemistry
- AS: AS90780
- Level: 3
- Credits: 5
- External
Chemistry 3.4 Describe properties of particles and thermochemical principles
Key tips
- Follow the symbols, nomenclature, spelling, and formatting of the current IUPAC (International Union of Pure and Applied Chemistry) convention as outlined from page four in the current Assessment specifications.
- In calculations, use the molar mass that you are given with the assessment question or that you find on the periodic table provided.
- Show all your working in calculations.
- Round numerical answers to an appropriate number of significant figures (usually three significant figures).
- Use correct units, and in thermochemical work identify states of matter in your equations.
- If you can, demonstrate knowledge that you have gained from relevant practical work.
- The value of the specific heat capacity of water (4.18 J °C–1 g–1) will be provided when required.
- Be specific and think carefully about the vocabulary you use in this standard. Common mistakes of understanding are found with the terms shielding, effective nuclear charge, radius/size.
- It is essential that you understand the difference between intermolecular and intramolecular bonding. It may help to create a mind map of the different types of bonding and solids as this bonding ONLY applies to covalent molecules.
- It may help to create a chart of the required transition metals and fill in their various oxidation states, colours, and electron configurations for each oxidation state.
