1925942
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Quiz von gina.mccombe, aktualisiert more than 1 year ago
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Erstellt von gina.mccombe
vor mehr als 9 Jahre
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Frage 1
Frage
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
Antworten
- True
- False
Frage 2
Frage
What is the correct definition of exothermic?
Antworten
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A reaction in which the enthalpy of the products is smaller than the enthalpy of the reactants, resulting in heat loss to the surroundings.
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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.
Frage 3
Frage
What is the ΔH of an endothermic reaction?
Antworten
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Negative
-
Positive
Frage 4
Frage
What kind of reaction is exothermic?
Antworten
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Combustion
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Photosynthesis
Frage 5
Frage
Select all the examples of endothermic reactions
Antworten
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Thermal Decomposition
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Combustion
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Respiration
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Photosynthesis
Frage 6
Frage
The equation for the complete combustion of methane is CH4(g) + 1.5O2(g) -->CO(g) + 2H2O(l)
Antworten
- True
- False
Frage 7
Frage
The energy from photosynthesis comes from the light of the sun
Antworten
- True
- False
Frage 8
Frage
Is the enthalpy profile diagram exothermic or endothermic?
Antworten
-
Exothermic
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Endothermic
Frage 9
Frage
Is this enthalpy profile diagram exothermic or endothermic?
Antworten
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Exothermic
-
Endothermic
Frage 10
Frage
Activation energy is the minimum energy required to start a reaction by the breaking of bonds.
Antworten
- True
- False
Frage 11
Frage
When a liquid the standard conditions are a concentration of 2.0 mol dm-3
Antworten
- True
- False
Frage 12
Frage
What is the correct definition of activation energy?
Antworten
-
The minimum energy required to start a reaction by the breaking of bonds
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The maximum energy required to start a reaction by the formation of bonds
Frage 13
Frage
Which is the correct equation for working out the heat exchange during a reaction?
Antworten
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Q=mcΔT
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n=c*V/1000
Frage 14
Frage
In Q=mcΔT, c is the specific heat capacity of the surroundings
Antworten
- True
- False
Frage 15
Frage
Select all the products formed in the complete combustion for CH4
Antworten
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CO2
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H20
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2H20
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CO
Frage 16
Frage
The ΔH of a combustion of C3H7OH is -1881 kJ mol-1, what type of reaction is it?
Antworten
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Endothermic
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Exothermic
Frage 17
Frage
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
Antworten
- True
- False
Frage 18
Frage
Which of the following is the correct explanation for breaking and making bonds?
Antworten
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Breaking bonds requires energy and is endothermic, making bonds releases energy and is exothermic
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Breaking bonds releases energy and is endothermic, making bonds requires energy and is exothermic
Frage 19
Frage
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
Antworten
- True
- False
Frage 20
Antworten
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Only one route between the reactants and products so does not allow the indirect determination of an enthalpy change
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The alternative routes between reactants and products which allows the indirect determination of an enthalpy change from other known enthalpy changes using Hess' Law
Frage 21
Frage
Which of these are factors that affect the rate of reaction?
Antworten
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Temperature
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Pressure, when the reactants are gases
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Concentration
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Surface Area
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The addition of a catalyst
Frage 22
Frage
When is the rate of reaction at its highest?
Antworten
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At the start
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During the reaction
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When one of the reactants has been used up
Frage 23
Frage
When one of the reactants has been used up the reaction continues
Antworten
- True
- False
Frage 24
Frage
A catalyst slows down a reaction and is used up in the process
Antworten
- True
- False
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