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