Covers the various sections relating to Rates of Reactions, as per the IEB Physical Sciences SAG.
Includes notes from the textbook, as well as additional class, video and research information, diagrams and practice questions.
Applicable to all IEB Grade 12s.
Written by a 95% < student.
Spelling and unwilling to fix it before final exams in November to where I do not need the notes for afterwards.
Seller
Follow
KirstenBarbour
Reviews received
Content preview
Rates of Reactions
Collisions:
When 2 reactance particles collide a reaction does not always occur
Ek1 Ek2
Collision
Kinetic energy:
If Ek1 + Ek2 ≥ Ea than a successful collision, a reaction takes place, could occur.
If Ek1 + Ek2 < Ea than a successful collision, no reaction, will occur.
Orientation:
Must collide so that the functional group, or centres of chemical activity, are in contact.
Collision theory
= Colliding molecules must have, apart from the correct orientation, a kinetic energy equal to or
bigger than the activation energy of a reaction before the reaction can take place.
,Rate of reaction
The change in concentration per unit time of either a reactant or a product.
𝐶ℎ𝑎𝑛𝑔𝑒 𝑖𝑛 𝑐𝑜𝑛𝑐𝑒𝑛𝑡𝑟𝑎𝑡𝑖𝑜𝑛 ∆𝑐
Rate = 𝑇𝑜𝑡𝑎𝑙 𝑡𝑖𝑚𝑒 𝑡𝑎𝑘𝑒𝑛
= ∆𝑡
Factors that affect reaction rate:
Nature of the reacting substances, but we cannot alter this, so rarely asked.
To increase reaction rate:
1. Increase the temperature
2. Add a catalyst at the start
3. Gas: Increase the pressure
4. Liquid or solution: Increase the concentration
5. Solid: Increase the surface area, by breaking into smaller pieces
, Measuring rates and graphs
The gradient of the tangent to the curve is used to determine rate.
∆𝑉 𝑜𝑟 ∆𝑐 𝑜𝑟 ∆𝑚
Gradient = ∆𝑡
= rate of reaction
Graphs:
Graph 1: Using products
e.g. Volume of gas formed (ml)
Time (s)
Graph 2: Using reactants
e.g. Mass of flask (g)
Time (s)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller KirstenBarbour. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $2.96. You're not tied to anything after your purchase.
