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