875958
Pregunta 1
Pregunta
In the equation Q = mcΔT, what does c stand for?
Respuesta
-
Energy released
-
Mass heated
-
Specific heat capacity
-
Change in temperature
Pregunta 2
Pregunta
In the equation Q = mcΔT, what does ΔT stand for?
Respuesta
-
Energy released
-
Mass heated
-
Specific heat capacity
-
Change in temperature
Pregunta 3
Pregunta
True or false? To find out the energy released per gram, we measure the change of mass in fuel and divide by that value.
Respuesta
- True
- False
Pregunta 4
Pregunta
True or false? To find the energy released per mole, we divide the energy released per gram by the relative formula mass of the substance.
Respuesta
- True
- False
Pregunta 5
Pregunta
Why do simple calorimeters not give an accurate reading for temperature change?
Respuesta
-
They do not have sophisticated data loggers
-
A lot of thermal energy is not transferred to the solution in the calorimeter
-
The calorimeter only allows pre-set temperature changes to occur
Pregunta 6
Pregunta
Which of these are features of a simple calorimeter?
Respuesta
-
Cup made of copper
-
Cup made of polystyrene
-
No lid is present
-
A lid is present
Pregunta 7
Pregunta
What would be the correct equation if 50g of acid was mixed with 50g of alkali causing a temperature rise of 9°C?
Respuesta
-
Q = 50 * 4.2 * 9
-
Q = 100 * 4.2 * 9
-
Q = 100 * 8.4 * 9
-
Q = 50 * 8.4 * 9
Pregunta 8
Pregunta
True or false? When measuring energy changes in solutions, we assume the solution behaves like water.
Respuesta
- True
- False
Pregunta 9
Pregunta
In an exothermic reaction, which side of the energy level diagram has more energy?
Respuesta
-
Reactants
-
Products
Pregunta 10
Pregunta
In an endothermic reaction, which side of the energy level diagram has more energy?
Respuesta
-
Reactants
-
Products
Pregunta 11
Pregunta
True or false? The energy change of a reaction is the difference between the maximum activation energy and the energy of the products.
Respuesta
- True
- False
Pregunta 12
Pregunta
How would an energy level diagram be different if a catalyst were present?
Respuesta
-
The activation energy would be higher
-
The activation energy would be lower
-
The reactants would have less energy
-
The products would have more energy
Pregunta 13
Pregunta
True or false? Bond breaking is exothermic.
Respuesta
- True
- False
Pregunta 14
Pregunta
What unit are bond energies measured in?
Respuesta
-
kJ
-
kJ/g
-
kJ/mol
-
kJ/cm^3
Pregunta 15
Pregunta
True or false? The bond energy needed to break a particular bond is the same as the bond energy released in forming that bond.
Respuesta
- True
- False
Pregunta 16
Pregunta
What is the ΔH of a reaction?
Respuesta
-
The bond energy of forming products - the bond energy of breaking reactants
-
The bond energy of breaking reactants - the bond energy of forming products
-
The bond energy of forming reactants - the bond energy of breaking products
-
The bond energy of breaking products - the bond energy of forming reactants
Pregunta 17
Pregunta
Which gas is being looked at as a possible alternative to petrol fuels?
Respuesta
-
Oxygen
-
Nitrogen
-
Hydrogen
-
Carbon dioxide
Pregunta 18
Pregunta
True or false? The only waste product of the combustion of hydrogen is water.
Respuesta
- True
- False
Pregunta 19
Pregunta
What do we use to combust hydrogen?
Respuesta
-
Internal combustion engine
-
Fuel cell
-
Downs cell
Pregunta 20
Pregunta
Which of these are disadvantages of using hydrogen as a fuel?
Respuesta
-
It is not very inflammable
-
There are safety problems due to flammability
-
It takes up a lot of storage space
-
At present we only have a limited supply
-
Hydrogen is toxic to humans
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