AP Chemistry Unit 8

Based on the graph what is the ΔH°_rxn for this endothermic reaction? Be sure to include the correct sign in your answer, don't worry about units.

Mathematical Equivalence

ON

Tags

NGSS.HS-PS1-4

Select all of the endothermic processes in the table on the right.

Tags

NGSS.HS-PS1-4

For the reaction 2H₂(g) + O₂(g) → 2H₂O(g) the bond enthalpies (in kJ/mol) are H-H = x, O=O = y, O-H = z Which calculation will give the value, in kJ/mol, of ΔH for the reaction?

• 2x + y - 2z

• 4z - 2x - y

• 2x + y - 4z

• 2z - 2x - y

Tags

NGSS.HS-PS1-4

Match the following properties with their classification as either an intensive or extensive property.

• Color of an object

• Silver

• Temperature at which an object changes from solid to liquid

• Melting point

• Appearance of an object

• Metallic

• Amount of matter in an object

• Mass

The formation ½ A₂ + 2 B₂ + C --> CAB₄ has an enthalpy of formation of -104 kJ/mol and a change in entropy of -60.8 J/mol*K at 30 °C. What is the free energy and spontaneity of the reaction? Pay attention to the units!

• -85.6 kJ/mol, thermodynamically favorable

• -18.3 kJ/mol, thermodynamically favorable

• +18.3 kJ/mol, not thermodynamically favorable

• +85.6 kJ/mol, not thermodynamically favorable

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Calculate the change in Gibbs free energy for each set of ΔH°rxn, ΔS°rxn, and T. (Assume that all reactants and products are in their standard states.) ΔH°rxn = −119 kJ ; ΔS°rxn = +242 J/K ; T = 308 K
Express your answer in kilojoules to three significant figures.
ΔG°rxn = ___ kJ

Calculate the change in Gibbs free energy for each set of ΔH°rxn, ΔS°rxn, and T. (Assume that all reactants and products are in their standard states.) ΔH°rxn = −119 kJ ; ΔS°rxn = −242 J/K ; T = 308 K Express your answer in kilojoules to three significant figures. ΔG°rxn = ___ kJ

Tags

NGSS.HS-PS3-1

Energy is required to ________bonds.

• form

• break

Tags

NGSS.HS-PS1-4

The part we are studying is called the _______

• Enthalpy

• Surroundings

• Heat

• System

Tags

NGSS.HS-PS3-4

The reaction vessel, temperature probe and even your hands can be parts of the ________

• Enthalpy

• Surroundings

• Heat

• System