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There are two common coordination numbers exhibited by metallic complexes, they are 4 and 6. The coordination number can vary with the ligand, even when the central metal ion stays the same. The coordination number is influenced by the relative sizes of the central metal and the ligands...

Perhaps this vector diagram will help you to visualise how the tension changes when an object is whirled vertically in a gravitational field. If the object is whirled at the critical speed, at the top of the swing the tension will be close to zero. At the bottom of the swing the tension will be...

These points are from my teaching guidelines for the Preliminary Chemistry Course, on Module 1 Properties of Matter. Students are not required to predict the stability of any particular nucleus. Students are provided the graph of the band of stability of isotopes, showing atomic number A...

Your question is quite vague. In order to do a depth study on project management, first you need a project. This music streaming company, does it have a real name? Do you have a real example of an information technology project that you would like to treat for your case study?

One of the characteristics of motors is that they MUST also function simultaneously as generators. As soon as a conductor is rotating in an external magnetic field, there will appear an induced e.m.f. in the conductor. OK, so that is the origin of the back e.m.f. Lenz's Law says that the...

Yes. The sodium ion is just a spectator. Potassium is also a spectator ion. The hydrated metallic cations are not all spectators. Some can have a dramatic effect on pH. The iron III (ferric) ion will lower the pH a lot. Nickel II and manganese II ions will raise the pH.

You have answered your own question! Water is pH7 because it contains 10-7 mol/L H+ and 10-7 mol/L OH- ions. The sodium ion in aqueous solution has negligible effect on the H+/OH- equilibrium in water. Only the acetate ion will have an effect on the equilibrium. The same reasoning applies to...

Have you heard of a colour wheel? If you paint the three primary colours onto a disk, like angle segments (or pizza slices), and rotate the disk quite fast, the perceived colour changes to white. This is really an experiment on how the human eye perceives colour. The human eye cannot...

Yes, I could show you the working, but I'm not going to do that. As a teacher, I believe you should use the hints I have given you to work it out for yourself. Sorry!

This question 19 Part (c) is not so hard. Step 1. Recognise that for each mass on the string, the tension force is the same. Also recognise that the forces on the system are both masses experience the force of gravity vertically downwards. Step 2. Decompose the force of gravity on each mass...

The equation you are referring to is this one - q=mCΔT where q is the quantity of heat in joules, and m is the mass of the system, C is the specific heat capacity of the system, and ΔT is the temperature change. How you further process that quantity of heat depends on the question. Read the...

Excuse me? Where does it say in the question that any calculation is required? The question appears to be asking for a qualitative answer, not a quantitative answer. Or have I missed something? However, the data is ambiguous. The number of significant figures in the number "100" is ambiguous...

Good question. Yes, or course the Engineering Studies syllabus will eventually change, but at the moment, NESA has its hands full with a huge number of simultaneous projects in primary and secondary education that have to be bedded down. Lets face it, fundamentally the scientific principles of...

Thank you for such a clear explanation of the problem, and your clear explanation of the difficulties that you are having. The good news is the answer to part (3) is quite simple, and it relies on the criterion of static equilibrium of a non-moving body. We are going to use the theorem that the...

All the above responses are good advice, especially correct use of the language of the syllabus. I would also add, "a picture tells a thousand words". If you can draw and annotate clear, relevant diagrams and graphs to explain your understanding, then your answer will remain focussed and you...

This problem is examining HSC Physics Module 5 Advanced Mechanics. Even though the object is a charged particle, it will still behave like a projectile subjected to a uniform force and a uniform acceleration. Instead of a gravitational field, the alpha particle is subjected to an electric...

The question is a fairly straight-forward examination of kinematics from HSC Physics Module 5. There is no data given, hence your answer must be qualitative, not quantitative. For 3 marks, you need to state three good, solid facts about the motion of both objects. The energy changes you could...

Yes, this is one of the central big ideas of Mod.6

Ammonia is not the only case you will encounter in Chemistry of a Bronsted-Lowry base. Maybe it is time to revise the advantages of the Bronsted-Lowry Theory of Acids and Bases. You are probably going to get a question in the HSC to compare the advantages of Arrhenius and the Bronsted-Lowry...

There are many differences between first ionisation enthalpy and electronegativity. One big difference is ionisation enthalpy is an absolute scale, measured in kilojoules per mole, whereas electronegativity is a relative scale comparing one element to another. As you know the electronegativity...