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Chemistry: Post your doubts here!
4) Oxidation state of S in SO2 = +4 x + (-2x2) = 0 x = +4 I2 + 2e- -----> 2I- We also know 1 mole of I2 oxidizes 1 moles of SO2 So we know: S+4 ----> S+y + 2e- So y - 2 = 4 y = 6. Answer is D. -
Chemistry: Post your doubts here!
4) P - One Br-Br bond is breaking. So enthalpy change is -193J Q - One Cl-Cl bond is forming. So enthalpy change is +244J R - One C-Cl bond is forming. So enthalpy change is +340J S - One C-H bond is breaking. So enthalpy change is -410J. Answer is therefore D. 6) NH4NO3 is really NH4+... -
Physics: Post your doubts here!
^I don't get why they're complicating things and finding 'R' in the marking scheme lol. This is how I got the answer (sorry my handwriting is kinda messy :p) : -
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Chemistry: Post your doubts here!
First write the balanced equation. 2H2S + 3O2 ------> 2H2o + 2SO2 (Note:For AS you're not required to know this equation by heart but whenever such a question appears, there are either hints in it about the products or the products are stated explicitly. Nonetheless, you're expected to know... -
Physics: Post your doubts here!
Wavelength of the waves [from the graph] = 50m Velocity of the wave = 8m/s [f]Frequency = Velocity/Wavelength = 8/50 = 0.16 Hz [a]Amplitude (or max displacement) of the waves [from the graph] = 2m Maximum velocity= 2(pi)af = 2 x pi x 2 x 0.16 = (16/25)pi Maximum KE of the object = (1/2)m(v^2) =...