Thermochemical equations

ΔH means:

• temperature

• energy

• change in enthalpy

• amount of energy released

A positive ΔH means the reaction is:

• complete

• at equilibrium

• exothermic

• endothermic

Tags

NGSS.HS-PS1-4

A positive ΔH means that:

• In order for the reaction to happen, heat must be input. It is exothermic

• In order for the reaction to happen, heat must be input. It is endothermic.

• When the reaction happens, heat is released. It is exothermic

• When the reaction happens, heat is released. It is endothermic

Tags

NGSS.HS-PS3-1

If ΔH is positive, heat would be shown on the _____ side of the thermochemical equation.

• Reactant

• Product

Tags

NGSS.HS-PS1-4

What type of reaction is shown in the reaction pathway?

• endothermic reaction
• exothermic reaction

Tags

NGSS.HS-PS1-4

Is the following exothermic or endothermic?

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

Is the following exothermic or endothermic?

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-4

C+ O₂ --> CO₂ ΔH = -60kJ/mol

What is the ΔH for this reaction?

• +60 kJ/mol

• -60 kJ/mol

• 60 kJ/mol

• 60 kJ

Calculate ΔH when 2 moles of ethanol (C₂H₅OH) reacts with excess oxygen according to the following thermochemical equation?

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O ΔH = −1350 kJ/mol

• -2700 kJ/mol

• -675 kJ/mol

• -1350 kJ/mol

• -1350 kJ

• -2700 kJ

What will ΔH be if there is 1 mole of oxygen?

4Fe(s) + 3O₂(g) --> 2Fe₂O₃(s) ΔH = –1500 kJ/mol

• -500 kJ/mol

• 500 kJ/mol

• -750 kJ/mol

• -4500 kJ/mol