For bond energies I am 100% sure it should be (-)1,276. I wrote out all the bonds underneath next to their bond energies, added up each side of the reaction and checked the numbers 3 times (I finished quite early so thought I'd count up each side again)
Yep, I just told someone that not putting a minus won't lose you a mark but they had what I think was the wrong answer... I agree from what I remember that it's -1,276kJ/mol
It was definitely an exothermic reaction which gave a negative enthalpy change and I'm 100%on this because at the start of the next question is said "this reaction is exothermic" lol
I thought it said "this reaction is exothermic" on the following page. I remember because I was unsure if I had done the calc right (ending up with negative value) and the statement basically confirmed I got the question correct/on the right lines at least
Its Rb because in group 1 (alkali metals), the Boiling point and Melting Point decrease as you go down. Rb was the last Alkali Metal so its the lowest Boiling Melting/Point.
Yes but rubidium is a solid at room temperature and fluorine is a gas, so it should be fluorine.
What did everyone get on that table question which asks about the changes of the solutions? I got white precipitate for the calcium one, no change for both the water one, no change for one of potassium and for the other potassium one I wrote fizzing and bubbling which i think is probably wrong.
I got no change for all except 1 of them where I said white precipitate! It looked really wrong lol but oh well.