Energetics

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

An example of an endothermic reaction is......

• burning

• neutralisation

• thermal decomposition

• metal and acid reactions

the thermite reaction.....

• relies on displacement

• absorbs more heat that is releases

• is useful for repairing broken train tracks

• uses thermal decomposition as its basis

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