https://drive.google.com/file/d/0Byj6YDtyLjhsbWZ2Sjk1WmJPQVk/edit?usp=sharing
https://drive.google.com/file/d/0Byj6YDtyLjhseFhvUEZ0alR2TzA/edit?usp=sharing
11. chemistry
Friday 16 May 2014
Tuesday 28 January 2014
28.1.14 Answers to bond energy questions
Please let me know after you have checked your answers if there is a problem.
Grade C Question.
Hydrogen
burns in chlorine.
H2(g) + Cl2(g) 2HCl(g)
a. One
each of H–H and Cl–Cl bonds breaks.
b. Two H–Cl bonds form.
c. Energy to break bonds = 434 kJ + 242 kJ = 676
kJ
Energy given out on forming bonds
= 2 × 431 kJ = 862 kJ
= 2 × 431 kJ = 862 kJ
Overall energy change = -186 kJ given out.
d.
Exothermic
Grade A Question 3.
a. Bonds broken = 1933kJ
Bonds formed = 1959kJ
Overall energy = -26kJ
b. Exothermic as the value is negative
Grade B Question 4
a.Negative
amount of energy given out. So products have less energy than the reactants.
b.Is
the minimum energy needed to start a reaction.
Grade A
to A* Question 5
c.i.
3466kJ/mol
c.ii.
-730 kJ/mol
Have fun
Sunday 26 January 2014
27.1.14 This week's homework
Please see the NEW science online homework site and work through at least TWO of the homeworks set for C7 module.
http://kerboodle.oxfordsecondary.co.uk/users/login.
For username and password and website please refer to the school website, science department, resources. It's at the end of the list.
Any problems see me asap and email as well.
Please complete for Monday 3rd Feb..
http://kerboodle.oxfordsecondary.co.uk/users/login.
For username and password and website please refer to the school website, science department, resources. It's at the end of the list.
Any problems see me asap and email as well.
Please complete for Monday 3rd Feb..
Monday 6 January 2014
Revision on new online homework
http://kerboodle.oxfordsecondary.co.uk/users/login?user_return_to=%2Fapp%2Fcourses%2F538%2Fmodules%2FHomework
Login in is initial and surname as one word lower case. and the same for the password
Login in is initial and surname as one word lower case. and the same for the password
Wednesday 23 October 2013
Holiday homework
Due to many of you sitting Maths and English exams when we get back - a change of plan
C7 organic test is monday 25th nov , but the Rates of reaction homework is for monday 4th nov.
C7 organic test is monday 25th nov , but the Rates of reaction homework is for monday 4th nov.
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