3:11

3:11 explain the effects of changes in surface area of a solid, concentration of a solution, pressure of a gas and temperature on the rate of a reaction in terms of particle collision theory

Increasing the surface area of a solid:

  • more particles exposed
  • more frequent collisions
  • increase the rate of a reaction

 

Increasing the concentration of a solution or pressure of a gas:

  • more particles in same space
  • more frequent collisions
  • increase rate of reaction

 

Increasing the temperature:

  • particles have more kinetic energy
  • more frequent collisions
  • and a higher proportion of those collisions are successful because the collision energy is greater or equal to the activation energy
  • increase rate of reaction

 

Past paper questions

2019-05-13T15:24:09+00:00Categories: PastPaperQuestions|Tags: , , , |
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Section 1: Principles of chemistry

      a) States of matter

      b) Atoms

      c) Atomic structure

     d) Relative formula masses and molar volumes of gases

     e) Chemical formulae and chemical equations

     f) Ionic compounds

     g) Covalent substances

     h) Metallic crystals

     i) Electrolysis

 Section 2: Chemistry of the elements

     a) The Periodic Table

     b) Group 1 elements: lithium, sodium and potassium

     c) Group 7 elements: chlorine, bromine and iodine

     d) Oxygen and oxides

     e) Hydrogen and water

     f) Reactivity series

     g) Tests for ions and gases

Section 3: Organic chemistry

     a) Introduction

     b) Alkanes

     c) Alkenes

     d) Ethanol

Section 4: Physical chemistry

     a) Acids, alkalis and salts

     b) Energetics

     c) Rates of reaction

     d) Equilibria

Section 5: Chemistry in industry

     a) Extraction and uses of metals

     b) Crude oil

     c) Synthetic polymers

     d) The industrial manufacture of chemicals

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