Enthalpy Quiz

ΔH value in an endothermic reaction is a positive number.

• True
• False

Match the definition below to the correct term.

The enthalpy change that takes place when one mole of a compound is formed from its elements in their standard states under standard conditions.

• The enthalpy of neutralisation

• The enthalpy of combustion

• The enthalpy of formation

• The enthalpy of reaction

How do you calculate Enthalpy of a reaction?

• ΔH = ΔH_products - ΔH_reactants

• ΔT = q / mC

• ΔG = ΔH -TΔS

• E = mc²

Which of the equation below refers to the standard enthalpy of formation, ΔH_f^o?

• Na(g) ---> Na⁺(g) + e^- ΔH = -364 kJmol^-1

• C₂H₅OH(l) + 3O₂(g) ---> 2CO₂(g) + 3H₂O (l) ΔH = - 1286 kJmol^-1

• 2C(s) + 2H₂(g) ---> C₂H₄ (g) ΔH = - 52.3 kJmol^-1

• Na⁺(g) ---> Na⁺(aq) ΔH = - 364 kJmol^-1

What type of reaction is shown in the reaction pathway?

• endothermic reaction
• exothermic reaction

C+ O₂ --> CO₂ + 60kJ, what is the value for ΔH for the reaction?

• +60
• -60
• there is no way to know

The diagram represents which type of reaction

• endothermic
• exothermic

In the Image, will the heat (+177.8 KJ) be a product or a reactant?

• Product

• Reactant

ΔH_rxn

• symbol for enthalpy of reaction

• symbol for enthalpy

• exothermic reaction

• difference in altitude

ΔH_rxn =

• H_products - H_reactants

• H_reactants - H_products

• H_products + H_reactants

• H_reactants / H_products