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Organic Chemistry Unit 3: Energy

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Quiz on Organic Chemistry Unit 3: Energy, created by gina.mccombe on 28/01/2015.
gina.mccombe
Quiz by gina.mccombe, updated more than 1 year ago
gina.mccombe
Created by gina.mccombe almost 10 years ago
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Resource summary

Question 1

Question
Standard conditions are 100 kPa, which is 1 atmospheres and 298K, which is 25°C although in liquids it is a concentration of 1 mol dm-3
Answer
  • True
  • False

Question 2

Question
What is the correct definition of exothermic?
Answer
  • A reaction in which the enthalpy of the products is smaller than the enthalpy of the reactants, resulting in heat loss to the surroundings.
  • A reaction in which the enthalpy of the products is greater than the enthalpy of the reactants, resulting in heat being taken in from the surroundings.

Question 3

Question
What is the ΔH of an endothermic reaction?
Answer
  • Negative
  • Positive

Question 4

Question
What kind of reaction is exothermic?
Answer
  • Combustion
  • Photosynthesis

Question 5

Question
Select all the examples of endothermic reactions
Answer
  • Thermal Decomposition
  • Combustion
  • Respiration
  • Photosynthesis

Question 6

Question
The equation for the complete combustion of methane is CH4(g) + 1.5O2(g) -->CO(g) + 2H2O(l)
Answer
  • True
  • False

Question 7

Question
The energy from photosynthesis comes from the light of the sun
Answer
  • True
  • False

Question 8

Question
Is the enthalpy profile diagram exothermic or endothermic?
Image:
7c70f234-7829-40bd-99d5-02debe18ad02 (image/jpg)
Answer
  • Exothermic
  • Endothermic

Question 9

Question
Is this enthalpy profile diagram exothermic or endothermic?
Image:
8e22ee59-b9f1-4790-9f02-b9d86d14ef6f (image/jpg)
Answer
  • Exothermic
  • Endothermic

Question 10

Question
Activation energy is the minimum energy required to start a reaction by the breaking of bonds.
Answer
  • True
  • False

Question 11

Question
When a liquid the standard conditions are a concentration of 2.0 mol dm-3
Answer
  • True
  • False

Question 12

Question
What is the correct definition of activation energy?
Answer
  • The minimum energy required to start a reaction by the breaking of bonds
  • The maximum energy required to start a reaction by the formation of bonds

Question 13

Question
Which is the correct equation for working out the heat exchange during a reaction?
Answer
  • Q=mcΔT
  • n=c*V/1000

Question 14

Question
In Q=mcΔT, c is the specific heat capacity of the surroundings
Answer
  • True
  • False

Question 15

Question
Select all the products formed in the complete combustion for CH4
Answer
  • CO2
  • H20
  • 2H20
  • CO

Question 16

Question
The ΔH of a combustion of C3H7OH is -1881 kJ mol-1, what type of reaction is it?
Answer
  • Endothermic
  • Exothermic

Question 17

Question
Bond enthalpy is the enthalpy change that takes place when breaking by homolytic fission 1 mol of a given bond in the molecules of a gaseous species
Answer
  • True
  • False

Question 18

Question
Which of the following is the correct explanation for breaking and making bonds?
Answer
  • Breaking bonds requires energy and is endothermic, making bonds releases energy and is exothermic
  • Breaking bonds releases energy and is endothermic, making bonds requires energy and is exothermic

Question 19

Question
Hess's law states that if a reaction can take place by more than one route and the initial and final conditions are the same, the total enthalpy change is the same for each route
Answer
  • True
  • False

Question 20

Question
An enthalpy cycle shows what?
Image:
7e5324d3-6385-4472-874d-32c534df58be.gif (image/gif)
Answer
  • Only one route between the reactants and products so does not allow the indirect determination of an enthalpy change
  • The alternative routes between reactants and products which allows the indirect determination of an enthalpy change from other known enthalpy changes using Hess' Law

Question 21

Question
Which of these are factors that affect the rate of reaction?
Answer
  • Temperature
  • Pressure, when the reactants are gases
  • Concentration
  • Surface Area
  • The addition of a catalyst

Question 22

Question
When is the rate of reaction at its highest?
Answer
  • At the start
  • During the reaction
  • When one of the reactants has been used up

Question 23

Question
When one of the reactants has been used up the reaction continues
Answer
  • True
  • False

Question 24

Question
A catalyst slows down a reaction and is used up in the process
Answer
  • True
  • False
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