1925942
Descrição
Quiz por gina.mccombe, atualizado more than 1 year ago
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Criado por gina.mccombe
mais de 9 anos atrás
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Questão 1
Questão
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
Responda
- True
- False
Questão 2
Questão
What is the correct definition of exothermic?
Responda
-
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.
Questão 3
Questão
What is the ΔH of an endothermic reaction?
Responda
-
Negative
-
Positive
Questão 4
Questão
What kind of reaction is exothermic?
Responda
-
Combustion
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Photosynthesis
Questão 5
Questão
Select all the examples of endothermic reactions
Responda
-
Thermal Decomposition
-
Combustion
-
Respiration
-
Photosynthesis
Questão 6
Questão
The equation for the complete combustion of methane is CH4(g) + 1.5O2(g) -->CO(g) + 2H2O(l)
Responda
- True
- False
Questão 7
Questão
The energy from photosynthesis comes from the light of the sun
Responda
- True
- False
Questão 8
Questão
Is the enthalpy profile diagram exothermic or endothermic?
Responda
-
Exothermic
-
Endothermic
Questão 9
Questão
Is this enthalpy profile diagram exothermic or endothermic?
Responda
-
Exothermic
-
Endothermic
Questão 10
Questão
Activation energy is the minimum energy required to start a reaction by the breaking of bonds.
Responda
- True
- False
Questão 11
Questão
When a liquid the standard conditions are a concentration of 2.0 mol dm-3
Responda
- True
- False
Questão 12
Questão
What is the correct definition of activation energy?
Responda
-
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
Questão 13
Questão
Which is the correct equation for working out the heat exchange during a reaction?
Responda
-
Q=mcΔT
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n=c*V/1000
Questão 14
Questão
In Q=mcΔT, c is the specific heat capacity of the surroundings
Responda
- True
- False
Questão 15
Questão
Select all the products formed in the complete combustion for CH4
Responda
-
CO2
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H20
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2H20
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CO
Questão 16
Questão
The ΔH of a combustion of C3H7OH is -1881 kJ mol-1, what type of reaction is it?
Responda
-
Endothermic
-
Exothermic
Questão 17
Questão
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
Responda
- True
- False
Questão 18
Questão
Which of the following is the correct explanation for breaking and making bonds?
Responda
-
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
Questão 19
Questão
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
Responda
- True
- False
Questão 20
Responda
-
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
Questão 21
Questão
Which of these are factors that affect the rate of reaction?
Responda
-
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
Questão 22
Questão
When is the rate of reaction at its highest?
Responda
-
At the start
-
During the reaction
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When one of the reactants has been used up
Questão 23
Questão
When one of the reactants has been used up the reaction continues
Responda
- True
- False
Questão 24
Questão
A catalyst slows down a reaction and is used up in the process
Responda
- True
- False
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