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