Chemistry New Syllabus Advice / Sample Answers by an Experienced HSC Tutor (1 Viewer)

[jinglebells1464646]

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What do you mean if it is symmetrical, it is polar? Aren't dialchohols symmetrical but also have high boiling point (that it, they are polar)?

 

[imhungry990]

What do i need to know from year 7-10 chemistry for year 11 and 12 chem?? - im trying to go over all the fundamentals and get them down pat.. but even in textbooks all the topics are a bit adhoc and theres no like "revision from past years"

 

[jazz519]

What do you mean if it is symmetrical, it is polar? Aren't dialchohols symmetrical but also have high boiling point (that it, they are polar)?
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Asymmetrical it is polar. The 3D geometry of a molecule is not always represented by how you would draw it on a piece of paper as the OH part of the molecule doesn't have to be on opposite all the time cancelling out the polarity completely. It's a general rule to go by that works in most cases. But as with most rules in chemistry, there are exceptions and diols would be examples of those molecules.

 

[jazz519]

What do i need to know from year 7-10 chemistry for year 11 and 12 chem?? - im trying to go over all the fundamentals and get them down pat.. but even in textbooks all the topics are a bit adhoc and theres no like "revision from past years"

I have deleted your previous post off this section as it's not relevant to the resource on chemistry. You should post that kind of message on the HSC discussion part of the forum. In terms of answering this specific question. There is only a few topics you need to know from Year 7-10 for further years.

These are:
- What is the difference between the different types of chemical bonds (metallic, covalent, ionic)
- How to find the chemical formula for simple compounds (like if you were asked what is the formula for sodium chloride you should be able to work out it is NaCl, and if asked formula for calcium chloride that is CaCl2. That falls into knowledge about what information the groups and periods in the periodic table give you in terms of the charge of a molecule)
- Linked to above, being able to go the other way around, so being able to name simple compounds like CO2, SO3, PCl5, KCl, BaSO4 etc.
(i wont go into the actual stuff here how to do it since that's for you to do yourself as I can't summarise all that content in a short post)
- How to write chemical equations on a basic level
- Laws of conservation such as mass and energy
- Electron configurations using periodic table
- Definitions of simple terms like elements, compound, mixture, atoms, molecules
- Difference between chemical and physical changes and being able to identify what a certain change is if asked
- Difference between protons, neutrons and electrons (charge and where are they located) in an atom
- How to read the periodic table for an element (i.e. knowing what is a mass number, atomic number, atomic symbol etc.)
- Being able to name what the groups in the periodic table are (i.e. alkali metals, alkaline metals, transition metals, halogens, noble gases etc.)
- The different kinds of chemical reactions (like what is a decomposition, precipitation, neutralisation, combustion etc.)
- What are indicators and how they are used to find pH (and what is the pH scale)

There might be a few other things but that's the main stuff