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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...

If you are struggling to get started with vector questions, then try drawing a diagram of what is going on. From the definition of the dot product, we know that 5=a x b x cosΘ With those hints, can you finish it off?

OK, I understand your question. It comes back to the different models of acids and bases. The Arrhenius Model proposes that acids ionise to give H+ ions and bases ionise to give OH- ions. Therefore, under the Arrhenius Model, neutralisation will produce water molecules. The Bronsted-Lowry Model...

I am not going to do the calculation for you, but I will outline the method. Water formation has nothing to do with this problem. In this neutralisation reaction, we are donating a proton to ammonia. There is no water formation. To calculate specific heat capacity, we need three pieces of data...

Whoa. hold on a minute. Let's get this straight, Ka does not change. Ka is a constant for practically any dilution. The only thing that can change Ka is a change of temperature. OK, so what does a change of dilution do to the equilibrium? It changes the percent dissociation of HF molecules, but...

I take your points about taking much of the mathematical theory of electromagnetism for granted in the HSC Physics syllabus. However you can teach everything required by the syllabus in transformers using well-behaved continuous functions like sine or cosine. There is no need to introduce...

Geeze, I hate these questions that are written by supposedly experienced HSC teachers, who have no specialist knowledge of electricity. Yes the best answer is (C) but the graphs for the primary emf and secondary emf are wrong. The actual graphs for emf would look like this: When the switch is...

The equations you used are the correct equations, but, you need to recognise the question refers to speed, and not velocity. Speed is always a positive number. Speed doesn't have a direction, it is not a signed quantity. Kinetic energy is also a scalar quantity, so it doesn't have a direction...

Are you referring to this part? "Calculate the Ksp of KCl at 60o C if the density of the solution is 1.2 g/mL" Pure water solvent has a density at 60o C of 1.0 g/mL. Therefore the extra 0.2 g/mL is the mass of the solute KCl. Convert that extra 0.2 g into moles of KCl solute. Convert the solute...

You haven't given the number of marks allocated to this question, but from the looks of the limited data, it is probably a 3 or 4-mark question. By the way, there are errors in the data. (1) Propane cannot be sourced from natural gas. (2) Methane is the main component of natural gas, so the...

A big part of the problem is shortage of qualified teachers, so schools shy away from resourcing this subject and they don't encourage students to consider it. I think it is an engaging subject for both City students and Country students, with excellent career prospects. Decades ago, this...

To be honest, I'm not sure why so many students try to memorise the solubility rules (and let's face it, they aren't consistent, because there are so many exceptions). The data is given to you in the examination, in the form of the Table of Solubility Constants. Sure, it is useful to be able to...

Did you do HSC Engineering Studies? (the 2 unit course) There is a very useful module in there on civil structures.

You will need the Periodic Table as a general reference for any question about nuclear transmutation (Module 8). You could be asked to write a nuclear transmutation equation, such as the fission of uranium-235 (Z=92) into strontium-94 (Z=38 ) and xenon-140 (Z=54), so you will want to refer to...

(A) is the correct answer. The significant feature of the three graphs is the sudden change of slope at t=2 min. The rates of change of all three species increased (by roughly x2 or x3) and the position of equilibrium is attained much more quickly. This is what a catalyst would do.

The heating power of eddy currents comes the conversion of electrical energy into heat. The rate of heating comes from the product of the current I squared times the resistance R. The equation is Power P = I2R. The magnitude of the eddy current I comes from the rate of change of magnetic flux...