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Everything posted by Wai

  1. Greenpeace and the alike claim that Japan has been whaling in the Australian Whale Sanctuary. Is this area that they're referring to really the Southern Ocean Whale Sanctuary, where Australia only has a partial claim, and scientific whaling is legal? Also, the refuelling by the Oriental Bluebird is located south of the southern 60th parallel, where there are no territorial claims. Greenpeace continues to hide the fact that only commercial whaling (i.e. what Norway is doing) is banned from the Southern Ocean Whale Sanctuary, but scientific whaling is allowed. I think the Japanese put a lot of effort into their research. Whale meat consumption is dropping in Japan, but they still continue to kill around the same number of whales, so I doubt selling of the meat is their primary focus. Why would they kill more whales if no-one wants to eat them? I think they just need more samples, since aquatic mammals would be more difficult to study than land ones.
  2. I have to give a speech to my class arguing that whaling is overpublicised, thanks to anti-whaling groups for attention and funds. Does the International Whaling Commission commend Japan's research papers? How many research papers have Japan written? Nick Gales from Australia says they've only written a mere 43 or so in 18 years, while Dan Goodman from Canada says they've written over 130. Even if Japan hasn't written a lot, or have made little progress, it doesn't mean that they haven't been trying. I'd like to hear from other scientists on this forum in regards to this issue. Thanks!
  3. Thanks! I think I've got the right answer now.
  4. Is it the New Century Schoolbook font?
  5. What is the name of the font used to make the mathematical objects? Eg. [math]y = x^2 - 6x + 8[/math]
  6. How do I express 1/(x^4 + 1) as a partial fraction, without using imaginary numbers? I'm having trouble finding the values of a and b.
  7. Our class was given a "ridiculously hard" extension maths project. I've been able to answer all the questions except one. This is the problem: --------------------- The variable [math]x[/math] is defined: [math]x = 1/2^2 + 1/3^2 + 1/4^2 + 1/5^2 ...[/math] Express the infinite sum [math]1 + 1/2^2 + 1/4^2 + 1/6^2 + 1/8^2 ...[/math] in terms of [math]x[/math]. --------------------- Could someone please give me a clue to solving this? I don't even know where to start. The teacher who wrote the project has received quite a lot of complaints lol.
  8. Does anyone know of a site that lists the "standard" colour codes used to represent atoms of certain elements in structural models? For example, some common ones I know are: Hydrogen: White Nitrogen: Blue Oxygen: Red Carbon: Black I know colour codes vary, but is there a commonly used colour to represent silicon?
  9. Whoops... typo there. Thanks
  10. Hi everyone, I'm just curious, is there a rule or pattern for calculating the charge of a polyatomic or radical ion such as sulfate and cyanide? For example, carbonate has a charge of 2-, and phosphite has a charge of 3-. How can you work out their charges without "memorising" them off a sheet? Thanks
  11. I'm asking these questions because I've honestly never done them in class, the teacher was absent today, and I haven't been able to find the solution in the textbook: An eye of mean diamter 2.5 cm has a near point of 15 cm and far point of 120 m. 1. When this eye looks at an object placed at its far point, what will it's focal length be? 2. When an object is 1 cm from the eye, what is the power of the eye's focusing system in dioptres? I've done all the other questions that I was given, and this is due tomorrow. Once again, thanks for guiding us students.
  12. Apart from carbon and silicon, are there any other good conductors of electricity that are metalloids or non-metals?
  13. I was just confused with that question because my textbook was rating reactivity as: Very reactive: Caesium, fluorine etc. Reactive: Aluminium, magnesium etc. Unreactive: Gold etc. Very unreactive: Helium, neon etc. The question said "very unreactive", so I assumed that it would be something like a noble gas. If it just said "unreactive", then I would have looked onto carbon a little more.
  14. Yeah, I know what subshells are. So it should be carbon then.
  15. You're not talking about carbon are you? Is it unreactive though? That's what I thought, but doesn't it form a lot of compounds?
  16. Could it possibly be a typo in the textbook?
  17. Okay, the question asked me to provide an example of an element that had the properties that it specified. All the others were easy, but I'm really confused about this one: - Lacks metallic lustre - Lacks ductility - Good conductor of electricity as a solid - Very unreactive - Solid at room temperature Here's what I think: - Can't be a metal then - Metalloid or non-metal then - Good conductor? ... - Very unreactive, noble gases? (since gold was eliminated) - Solid? Not the noble gases then... So what could this element be?
  18. Catalase is used to break up hydrogen peroxide into water and oxygen. I can demonstrate this on a potato by cutting it up and dripping the substance on it, but how do I prove that the bubbling gas released is oxygen? I can tell from the chemical equation, but the question needs me to demonstrate something practically. Is it possible to prove that it is oxygen by dipping a piece of pure iron into the foam and see if it rusts?
  19. I know the enzyme maltase woks on the substrate maltose and cellulose synthase on cellulose etc., but the question also asked me to give the name(s) the enzymes that work on a general protein and a general lipid. Is there an enzyme that works on all proteins or lipids or something? I thought they were very specific...
  20. I know how a breathalyser works, but someone explain to me how it can give a relatively accurate reading of BAC? Is it the colour coding involved with the chemical reaction?
  21. Wai

    Tadpoles dying

    Ah. I'll keep searching for answers to the tadpole one. I was just a little surprised that there would be quite a number of questions that required extra research. Thanks bunches!
  22. Wai

    Tadpoles dying

    Hello all, I just started doing Year 12 biology at school, but I'm already stuck with a few questions which I can't answers for in the text book. 1. Explain why tadpoles living in a puddle of water may die well before the water has completely dried up. 2. Chloroform and ether quickly induce unconsciousness. What chemical property do they have which explains their rapid absorption and thus rapid effect? 3. If a drowning person inhales fresh water into their lungs, death occurs rapidly in about three minutes. If a drowning person inhales sea water instead of fresh water, death occurs more slowly taking about six to eight minutes. Use your understanding of osmosis to explain the difference between inhaling fresh water and sea water. You will need to consider the relative salt concentrations of sea water (1100 mOsm), blood (300 mOsm) and fresh water (0 mOsm). I have searched everywhere but haven't found any specific answers. Could anyone help me with these? Thanks
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