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  1. S

    Feedback on practical writeup

    Its all really good, just make the hypothesis sound more professional, you don't need to mention it is a guess because that is what a hypothesis is. Also in the Discussion include some information on Accuracy, Reliability and Validity and Some possible solutions to the problems encountered.
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    chemical reactions releasing sulfur dioxide

    Sulfur Dioxide: 1. When organic matter decomposes it produces hydrogen sulfide (H<SUB>2</SUB>S), which then oxidises (reacts with oxygen) to produce sulfur dioxide: 2H<SUB>2</SUB>S<SUB> (g)</SUB> + 3O<SUB>2 (g) --> </SUB>2SO<SUB>2 (g)</SUB> + 2H<SUB>2</SUB>O...
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    Galvanic cell question!!

    So when we refer to our Table of Standard Reduction Potentials we can see that Ni has a reduction potential of -0.24 V, whereas Cl2 (g) is +1.36V. Therefore Ni will undergo oxidation and Cl2 (g) will be reduced. So we can deduce that more Ni atoms will go into ionic state after displacing Cl2...
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    Focal Length

    This can be sort of confusing, especially the relationship between the ciliary muscles, the suspensory ligaments and the shape of the lens. Try to make sense of the following: If the lens becomes more rounded (greater curvature) it refracts light to a greater extent and close objects can be...
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    measuring the size of red and white blood cells.

    – Estimated diameter of small (400x) field of view: 0.45mm – Estimated number of red blood cells (400x): 53 – Estimated size (diameter) of a red blood cell: 0.45mm/53 = 8.5 x 10-3 mm x 1000 = 8.5 micrometers This is just an example of results. Your results may vary...
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    Enantiostasis HELP!

    – DEFINITION: Enantiostasis is the maintenance of metabolic and physiological functions, in the absence of homeostasis, in an organism in response to variations in the environment. – An estuary is where a river meets the sea, and freshwater mixes with saltwater – In such an...
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    Kidney dissection

    Like sinophile said, you want to cut longitudinally, meaning cut down the long side. So if you place the kidney on a horizontal table, cut horizontally at the level of entry of the ureter on the opposite long side. Cut all the way through so you get a neat cross section of the inside.
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    Explaination for dot point 3.2.4

    – Diffusion and osmosis are both examples of passive transport, relying on random movements of molecules. – Diffusion is too slow for the normal functioning of the body and does not select for reabsorption of useful solutes. – Osmosis only deals with the movement of water...
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    dot point help

    – Computer chips: With superconductors no heat is produced and so wires and transistors on a computer chip could be packed much more closely together and with no heat produced, making computing power much more faster. – Generators and motors: The use of superconductors in...
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    Magnetic Field -- Help please

    What whitnall8 said is spot on, using the arrow method is the best way to remember it, so always try to visualize a traditonal arrow. So if you fire an arrow horizontally away from yourself, you will see the feathers. If someone fires an arrow straight at your, you will see the sharp point.
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    Space HELP! - Metre? Oo

    The metre was first defined in 1793 as one ten-millionth of the length of the Earth's quadrant passing through Paris. When SI of units was set up (1875), metre was defined as the distance between two lines inscribed on a single bar of platinum-iridium alloy. Current definition is much more...
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    the use of the slingshot effect in the Voyager space shuttle program

    The ‘sling-shot effect’ allows satellites to change speed and direction and gain some angular momentum and kinetic energy of the planet. Gravity allows the ‘coupling’ between the probe and planet via an “elastic collision” to facilitate the transfer. So essentially, The Law of...
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    Relativity

    Biopia and Pwnage101 gave excellent information. Just one more little thing - be aware that in the length contraction, time dilation and mass dilation formulas, Lv, tv and mv (with subscript v's) are for the moving frame of reference whereas L0, t0 and m0 (with subscrip 0's) are the rest frame...
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    factors affecting the strength of a gravitational field

    What icecoffee stated is spot on, so apart from The factors we can ascertain from Newton's Law - distance and mass, the other main factors affecting strength of gravitational force are Altitude, Earth being flatter at the poles, Centripetal force and Varying density of the Earth.
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    Michelson-Morley Experiment

    The main points you need to know are as follows: – Aim: To measure the existence of an aether wind which caused the speed of light to vary. – Equipment: Interferometer mounted on a large stone block floating on mercury so it could be rotated to repeat the experiment in different...
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    Does Physics need tutoring?

    When I did it, I had a physics teacher who was very smart, but didn't teach much. So I enjoyed learning about physics myself and just asking hard questions here and there to my teacher. But I think the key is to actually want to learn physics and understand the beauty of the theories and not...
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    Faulty valves

    Two fundamental defects: Valve incompetence/insufficiency - Valvular insufficiency results from the valve leaflets not completely sealing when the valve is closed so that regurgitation of blood occurs (backward flow of blood) into the proximal chamber. Valve Stenosis - Failure of a valve...
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    Which is the easiest Option Topic?

    From personal opinion having had a good look at most options, Communication is one of the most interesting and simple options so I would recommend it. In my opinion Genetics - the code broken can get somewhat tricky in parts and quite conceptual, so if you struggle with basic genetics as in...
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    Scared of stuffing up

    If you are scared of stuffing up, create an action plan of what you want to achieve by when. At least you are then accountable to yourself. But remember to relax and get some fresh air. Relaxing shouldn't just involve a computer or the tv.
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    Competitions?

    If you are looking for things to do, to put on your Applications I recommend doing the YAA Business Skills Program. Once you are allocated into a team, apply for a leadership role. Remember, its not just about academics, especially for scholarships, they want well-rounded individuals and they...
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