MYTUTOR SUBJECT ANSWERS

276 views

What factors affect rate of reaction?

In order for a reaction to occur, particles must 1. COLLIDE with each other 2. with sufficient KINETIC ENERGY (energy greater than or equal to the ACTIVATION ENERGY). This is known as Collision Theory. There are different factors that can change rate of reaction by affecting either the frequency of collisions or the energy the particles have.

1. TEMPERATURE: Increased temperature means increased heat energy. This is transferred to kinetic energy. There are more collisions per unit time with sufficient energy so the rate increases.

2. SURFACE AREA: increased surface area (i.e. a powder instead of a lump of the substance) means that there are more particles in contact with each other. There are more sucessful collisions per unit time so the rate increases.

3. CONCENTRATION OF REACTANTS: Higher concentrations mean more particles in the same volume. There are more collisions occuring so more successful collisions per unit time and the rate increases.

4. CATALYST: Catalysts don't affect the frequency of successful collisions directly but work in another way. They lower the activation energy by providing an alternative pathway. This means more particles will have energy greater than or equal to the activation energy so there are more successful collisions per unit time and the rate is increased. REMEMBER: catylsts are not used up in the reaction themselves and don't affect the reaction in any other way than the rate.

Amy H. 13 Plus  Maths tutor, IB Maths tutor, 11 Plus Maths tutor, GCS...

4 months ago

Answered by Amy, a GCSE Chemistry tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

198 SUBJECT SPECIALISTS

£18 /hr

William B.

Degree: Mathematics (Masters) - Durham University

Subjects offered: Chemistry, Physics+ 1 more

Chemistry
Physics
Maths

“Hi there! I'm Will, a first year maths student at Durham, who's passionate about teaching maths (and physics), helping support students to achieve their potential. I believe listening to students to find out how I can best help them i...”

MyTutor guarantee

£18 /hr

Laura M.

Degree: Medicine (Other) - Bristol University

Subjects offered: Chemistry, Maths+ 5 more

Chemistry
Maths
Geography
Biology
.UKCAT.
-Personal Statements-
-Medical School Preparation-

“About me: I am a friendly and enthusiastic fourth year medical student studying at the University of Bristol. I found myself enjoying Maths and Sciences from an early age and eventually decided that it was my calling to be a doctor. W...”

£18 /hr

Hannah S.

Degree: natural sciences (Masters) - Exeter University

Subjects offered: Chemistry, Physics+ 2 more

Chemistry
Physics
Maths
Biology

“About me: I am a third year Natural Sciences student at Exeter University. I've always loved education and find helping others with theirs extremely rewarding and enjoyable. I tutored GCSE students throughout my A levels at school and ...”

About the author

£18 /hr

Amy H.

Degree: Philosophy and Linguistics (Masters) - Edinburgh University

Subjects offered: Chemistry, Spanish+ 5 more

Chemistry
Spanish
Religious Studies
Maths
Latin
French
English

“ABOUT ME: I am in my first year at the University of Edinburgh studying Philosophy and Linguistics but grew up and went to school in London where I did the IB. Because of this, I have a wide range of subject interests from languages t...”

MyTutor guarantee

You may also like...

Posts by Amy

How do I know when to use SER or ESTAR

What factors affect rate of reaction?

Other GCSE Chemistry questions

Balance the equation for the complete combustion of hydrogen.

What is a saturated hydrocarbon? Name one saturated hydrocarbon, and write its molecular structure, stating how many Hydrogen and Carbon atoms it contains (3 marks).

Describe and explain the trend in reactivity of the alkali metals (Group 1)

A student titrates 25.00 cm3 of hydrochloric acid with 28.60 cm3 sodium hydroxide solution of concentration 0.200 moles per dm3. The equation for the reaction is: HCl + NaOH to NaCl + H2O. Calculate the concentration of the hydrochloric acid.

View GCSE Chemistry tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok