one was about why fuel for camping is in liquid form rather than as a gas. It's not because it more safe or easier to store, oh no, it's cause it takes up less stupid volume!
Lmaoo, that is the exact answer i put and looked at the stupid mark scheme and was like , now in the real thing I wouldve never even guessed that,
It's so annoying isn't it?! Also one in jan 2012, where there's two lone pairs and 3 bonding pairs, and the shape is trigonal planar not trigonal bypyramidal
June 10, 8a (part 2) and 8b. Could anyone explain these pls
For the N isotope, you know that isotopes have the same number of electrons as an atom of an element. So you know that no. neutrons = mass no - atomic no.. no. neutrons = 15 - 7 = 8 neutrons. And 7 electrons/protons.
So the fundamental particles are 7 protons/electrons and 8 neutrons.
June 10, 8a (part 2) and 8b. Could anyone explain these pls
8a) mass number is the total number of protons and neutrons of an atom. So the fundamental particles will be 7 protons 7 electrons and 15-7=8 neutrons.
8b) Relative atomic mass: average mass of one atom of an element/mass of 1/12th carbon 12 atom. (95.12x14)+(4.88x15)/100= 14.05 to 2 dp
June 10, 8a (part 2) and 8b. Could anyone explain these pls
For 8B, RAM could be any old defintion, while mine would be "the average mass of an atom of an element in relation to that of an atom of carbon-12 which is exactly 12g.
To calculate the RAM, you know that RAM = (m/z x abundance)/100. So (95.12 x 14) + (4.88 x 15)/100 = 14.0488 = 14.05(figs)
It's the 2nd group, it's because the jump between ionisation energies occurs between the 2nd and 3rd required ionisation energy. If the jump was to occur between the 3rd and the 4th we'd know that that element belongs to the 3rd group. (by jump I mean you're talking about a massive difference between ionisation energies relative to previous or next ionisation energies in the table)
It's so annoying isn't it?! Also one in jan 2012, where there's two lone pairs and 3 bonding pairs, and the shape is trigonal planar not trigonal bypyramidal
I knoow!!! like I was just going over it and thinking like seriously, where on earth did it say in the revision guides about T shapes!! I just hope they dont throw in suprises in this exam