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  1. Casablanca

    Chemistry: Post your doubts here!

    Thank you for the first one. As for the second one, yes, you are right. I accidentally wrote that acidity decreases, whereas acidity actually increases, but since the graph goes down, I misinterpreted it. :P So, yeah, I know Cl2O7 is most acidic, but is it a lot more acidic than SO3 and...
  2. Casablanca

    Chemistry: Post your doubts here!

    Concentrated sulfuric acid can behave both as a strong acid and as an oxidising agent. With which compound does concentrated sulfuric acid react in this way? A. Ethanol B. Magnesium Carbonate C. Propanenitrile D. Sodium Bromide Why? --- In the graph of acidity of period 2 oxides...
  3. Casablanca

    A level Biology: Post your doubts here!

    This looks to me like chlorenchyma tissue. Google several different images and compare yourself for confirmation. The white in the center is phloem, and the red surrounding is xylem. I THINK. I'm not 100% sure. So check in the marking scheme of this past paper just in case. Edit: It's a dicot...
  4. Casablanca

    significant figures

    Sig. fig. should be according to your raw data. For example, if your reading is 1.2cm, try to stick to 2 sig.figs. in all cases. In marking scheme, you're allowed one more, but to avoid complications, just stick to what is safe.
  5. Casablanca

    Biology Practical notes!!

    What do you mean by "no unbroken lines"?
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