Ch 21 Part 6 Thermochemistry A Check 1

Is heat taken in or released in an endothermic reaction?

• taken in

• released

Label any 3 parts of this Bomb Calorimeter

Answer explanation

Is ΔH + or – for an exothermic reaction?

• ΔH = +

• ΔH = -

Which is more general, heat of reaction or heat of combustion?

• Heat of reaction

• Heat of combustion

Explain why?

Give two important things to note about heat of combustion?

Is this equation the heat of combustion for butane?

• Yes, there is excess oxygen

• Yes butane is combusted and heat is given off

• No, there isn't enough oxygen (unbalanced equation)

• No, there is more than 1 mole of butane

Balance this combustion equation for octane

Answer explanation

Watch this video if you want a full walk through on balancing this

https://youtu.be/x33NBRhxV-o

What type of reaction is this energy profile diagram of?

• Endothermic

• Exothermic

Answer explanation

The products have less energy than the reactants so the difference in energy is released as heat (temp increase)