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First question: A, B, C are all physical changes (less energy needed), D is a chemical change (decomposing H2O into H2 and O2 -- more energy required for this) Second Question: Comes back to sub shells. Phosphorus has 5 valence electrons, 2 in the 3s sub shell and 3 in the 3p sub shell. It...

Alternatively in the last step above, could just do from 1.2x10^7 to 5.6x10^7, then no need to subtract

DW mate. In all honesty, it's impossible to get through all 4 topics in Year 11 Phys/Chem and do it well. Most of the time I miss out on at least 3/4 of cosmic engine with my Year 11s, but I do ensure that those couple of things I mentioned are covered well :)

I'll give you a hint! There is also N1L and N3L!

Main things IMO World Communicates: Wave Equation EM Spectrum (order and relative wavelengths) Inverse Square Law Electrical Energy Electric Fields Ohms Law Power Magnetic Fields Moving About Speed/Acceleration Vectors N2L Centripetal Acceleraton/Force Weight/Mass...

Classes filling up! All classes have, at most, 3 spaces left.

Kind of.. With concept maps you want to link the boxes with words, not just arrows.

Running regression analysis on HSC Chemistry for the last 3 years -- you need 62-65 raw to achieve an exam mark of 80 in the last 3 years. So, take that as you will, you need to pick up a couple of marks from now until the HSC (plenty of time!) but keep in mind that HSC Chemistry is really...

I haven't even started advertising for preliminary chemistry + physics for 2017, but my preliminary physics class is nearly full (pending a couple of confirmations) and my preliminary chemistry class is half full. The preliminary classes will be run from Parramatta on Thursday evenings.

That's more of a mindmap than a concept map, concept maps include key terms connecting key ideas --> really useful for 'explain' type questions and above (where you need to show relationships (and perhaps implications of relationships) KISS booklets are bare bones -- as with any source of...

Both AC and DC generators produce AC in the coil! Think about it, 2 identical coils, rotating at identical speeds in an identical magnetic field -- should produce identical EMF (AND THEY DO!) AC gets changed into DC via the split ring commutator as it moves from the coil into the external circuit

- Write balanced eqn for formation of ppt - Find number of moles of ppt - Find number of miles of ion (from balanced eqn) - find concentration (c=n/v)

Should use your finger nail to mark any MC answers you know straight off the bat (graphs of inverse functions etc), saves a little bit of time.

Nah, Exam Choice are usually pretty straight forward. They have the odd good question here and there, but most are pretty standard.

I just had a look through my papers as I thought i recognised the font. It's from the 2013 Exam Choice Paper, the answer is D in the marking criteria. /high5sintegrand lol

How have they explained the answer as being B? It's an impossible answer! Change in Ep is only mgh = 0.1x9.8x1 = 0.98J. Can't get 3.7J transformed into other types of energy if there is only 0.98J to play around with in the beginning, it violates LOCOE! Answer is definitely D.

I haven't done the calculations, the approach should be as follows: Find the loss of Ep (just use mgh) Find the gain in Ek (use 1/2mv^2) Loss of Ep - Gain in Ek = energy loss (or other forms of energy)

You may be thinking of using Vy = Uy + ayt, solve for t when Vy=0 then double it. But, this is essentially what integrand has done -- most students should understand both ways.

Sure. HSC Chemistry 2013 Q23(a) assessed outcomes from 2 x Year 12 topics alongside 2 x Year 11 topics. Tbh, I think that learning by dot point works fine for most students. It helps the lesser-able students structure their ideas and the higher achieving students can usually link dot point...

3 places confirmed taken in the last 3 days. Classes filling pretty quickly. Only 10-15 spaces available (split over 5 classes). 27 spots confirmed taken. 5 or 6 pending confirmation.