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  1. J

    If a chemical reaction is exothermic, why is its reverse reaction always endothermic, and vice versa?

    is there are way you can construct an explanation as if you were answering a question in an exam, with terms such as activation energy?
  2. J

    If a chemical reaction is exothermic, why is its reverse reaction always endothermic, and vice versa?

    Could i please get a sufficient answer for a 4 mark explain question please :)
  3. J

    Can I get some help with questions?

    really easy trigonometry problem but i am dumb: 0° < x < 360° sin x = sin y (find all possible values for x)
  4. J

    Can I get some help with questions?

    could i know the diagram for this question?
  5. J

    Can I get some help with questions?

    Can I please get help with question a. I know how to solve it but i feel the working out will not make sense.
  7. J

    Can I get some help with questions?

    all good, thanks :)
  8. J

    Can I get some help with questions?

    1. From a point P, a person observes that the angle of elevation of the top of a cliff A is 40°. After walking 100 m towards A along a straight road inclined upwards at an angle of 15° to the horizontal, the angle of elevation of A is observed to be 50°. Find the vertical height of A above P...
  9. J

    Past Papers? - Maths Advanced 2021

    Does anyone have any past half-yearly and yearly papers of preliminary maths advanced?
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