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WorksheetsEnergetics 1
Total questions: 19
Worksheet time: 10mins
The energy level diagram for the reaction between magnesium and hydrochloric acid is shown.
Energy is given out during the reaction
The products are at a lower energy level than the reactants
The reaction is endothermic.
Which statements about exothermic and endothermic reactions are correct?
During an exothermic reaction, heat is given out
The temperature of an endothermic reaction goes up because heat is taken in
Burning methane in the air is an exothermic reaction
Which reaction is endothermic?
acid neutralising alkali causing a temperature increase
adding magnesium to hydrochloric acid
calcium carbonate decomposing when heated combustion of fossil fuels
Which is an endothermic process?
Burning hydrogen
Distilling petroleum
Reacting potassium with water
Using petrol in a motor car engine
Which fuel does not produce carbon dioxide when it burns?
Coal
Hydrogen
Methane
Which substance is not a fossil fuel?
coal
kerosene
wood
Statement 1 Hydrogen is used as a fuel.
Statement 2 When hydrogen burns in the air to form water, heat energy is produced.
Which is correct?
Both statements are correct and statement 2 explains statement 1
Both statements are correct but statement 2 does not explain statement 1
C Statement 1 is correct but statement 2 is incorrect
Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. What would show that the process was exothermic?
A blue solution is formed
The beaker feels cooler
The beaker feels warmer
Quicklime has which formula?
CaO2
CaO
CaCO3
CuO
Exothermic reactions are ones that.....
Release energy to the surroundings
Absorb energy from the surroundings
Remain at a constant temperature
Decrease in temperature
Neutralisation reactions always....
stay the same temperature
decrease in temperature
increase in temperature
Increase at first and then decrease at the end
Adding energy to get a reaction started is.....
Activation energy
Catalytic
never needed
needed for breaking bonds
Combustion reactions are ......
always resulting in an increase in temperature
never decrease in temperature
always result in a zero enthalpy change
never have temperature increases
endothermic reactions ........
have more energy in their products
have less energy in their products
have more energy in their reactants
have the same amount of energy in reactants and products
A minus figure in an enthalpy change is....
a mistake
sometimes caused by the wrong reactants
no significance
tells you it is an exothermic reaction
The amount of energy change in a reaction is known as.....
endothermic
Delta H
exothermic
Mole/Mass/delta H
A reaction that produces a flame is ___________________
Endothermic reaction
Exothermic reaction
Flammable reaction
Redox reaction
Endothermic reactions ________________ heat
Release
Absorb
Release and absorb
What does this graph represent?
An endothermic reaction
An exothermic reaction
None of the above
