Where to find AQA a-level biology specification?

Chemistry AQA unit 1 thoughts? AS AQA UNIT 1 CHEMISTRY 14th JAN 2010?

• Just wondering what people thought of this exam. I took it today, just wondering what grade boundary estimates might be? ?/70 Also could some one explain why in the ionisation energy question the answer is 7000 ish ? I put smaller because i thought it became easier to remove the first electron in a sub orbital because it has no electron shielding ? I thought it was okay but i'm discovering loads of stupid mistakes i've made. I don't understand why AQA AS biology grade boundaries are like 37/60 for an A with an easier paper than chemistry whereas chemistry's grade boundary is 56/70 this seems really silly as chemistry requires you to get almost 20% more marks the achieve an A grade. I do both biology and chemistry and i find biology the easier of the 2 so someone please enlighten me as to why these two exams have such different grade boundaries. Thanks for reading hope someone can help me.

• Answer:

  I thought it was tricky, but very common sense based, as in I liked it because it seemed quite straight forward. Chemistry is notoriously difficult so they have expectations to uphold. The ionisation question was because to remove the first two electrons you take them from an s orbital, i.e. 3s however the next electron removed is taken from a p orbital i.e. 2p. As you are removing the outermost electron each time, when you take it from p there is less distance between the nucleus and electron so the attraction is stronger, also you're right there's less shielding which means its even harder to remove and so requires more energy. Wheras if you take it from 3s there is more shielding and more distance so it'ss easier to remove. I don't know which questions I got wrong, where did you get the marks scheme from?