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