Rates of Reactions

FuseSchool
Quiz by , created over 3 years ago

11 practice questions

14
0
0
FuseSchool
Created by FuseSchool over 3 years ago
The Periodic Table
asramanathan
Acids, Bases and Salts
asramanathan
Chemistry Module C2: Material Choices
James McConnell
English Terminology for AS Level
rhigzy
Chemistry 2
Peter Hoskins
C1 Quiz
Leah Firmstone
GCSE Chemistry C2 topic notes
imogen.shiels
Acids and Bases quiz
Derek Cumberbatch
Ionic Bondic Flashcards.
anjumn10
Electrolysis
lisawinkler10

Question 1

Question
An increase in temperature increases the rate of reaction. Why? How many of these are correct explanations. - The particles move faster because they have more energy. - Particles collides more often. - There are more particles per unit volume, resulting in more collisions. - More of the collisions between particles are successful because they have more energy (have the activation energy). - Rate of reaction increases because there is an increase in the frequency of collisions. /
Answer
  • 2
  • 3
  • 4

Question 2

Question
Increasing the concentration of the reactant increases the rate of the reaction. Why? How many of these are correct explanations. - Rate of reaction increases because the particles move faster and collide more. - Rate of reaction increases because there are more particles per unit volume. - Rate of reaction increases because there is an increase in the frequency of collisions. - Rate of reaction increases because the particles have more energy.
Answer
  • 2
  • 3
  • 1

Question 3

Question
What is the effect of increasing the pressure on the rate of reaction?
Answer
  • Rate of reaction increases because particles are closer together and so the frequency of collisions increases.
  • Rate of reaction increases because there are more successful collisions.
  • Rate of reaction increases because more of the particles have the required activation energy.

Question 4

Question
Increasing the surface area of a solid reactant causes an increased rate of reaction. Why?
Answer
  • More particles are exposed to the other reactant, meaning there are more collisions, so increasing the rate of reaction.
  • The increased surface area means that the pressure of the reaction is increased, hence causing more collisions.
  • The increased surface area increases the concentration of the reactant, resulting in more collisions.

Question 5

Question
What do catalysts do?
Answer
  • Slow down the rate of reaction
  • Increase the rate of reaction
  • Activate a reaction

Question 6

Question
Why do catalysts not need replacing too often?
Answer
  • They are not used up.
  • They are unreactive.

Question 7

Question
Which two statements best explain how catalysts speed up reactions? A) Catalysts do not get used up during the reaction. B) Catalysts make reactions exothermic. C) Catalysts lower the activation energy of the reaction. D) Catalysts provide a different route for a chemical reaction to occur. E) Catalysts raise the temperature of the reaction.
Answer
  • C and E
  • C and D
  • A and D
  • A and B