The thermite reaction demonstrated in class is 2 Al(s) + Fe₂O₃(s) → 2 Fe(s) + Al₂O₃(s). The ΔG°f of Fe₂O₃(s) is –742.2 kJ/mol and the ΔG°f of Al₂O₃(s) is –1582.3 kJ/mol. Calculate ΔG° for the reaction and indicate whether it is product- or reactant-favored.

In addition to being highly exothermic and spontaneous, the rocket booster reaction involves a large entropy change. Which statement correctly identifies the sign of ΔS and justifies it?

Using the balanced rocket booster equation from Question 41 and the standard enthalpies of formation below, calculate the standard enthalpy change (ΔH°) per MOLE of NH₄ClO₄ that reacts. Compound ΔH°f (kJ/mol) NH₄ClO₄(s) –69.42 Al₂O₃(s) –1669.8 AlCl₃(g) –705.6 H₂O(g) –241.82  

_________ is/are a clouding of the lens of the eye.

How many moles of H₃O⁺ are found in 1.50 L of solution at pH 9.57?

What is the principal intermolecular force present between molecules of liquid isopentane?

Which of the following is the best statement of the first law of thermodynamics?

Acetic acid, CH₃CO₂H, is a weak acid (Ka = 1.8 × 10⁻⁵). Trifluoroacetic acid, CF₃CO₂H, made by replacing the three non-dissociable H atoms of the methyl group with F atoms, is a borderline strong acid (Ka between 10⁻¹ and 10⁻²). Which statement best explains this several-thousand-fold increase in Ka?

In a chemical reaction, the value of ΔH differs from the ΔE value at constant T and P when

Compared to many other regions, emerging adulthood seems to be particularly prolonged in Europe.  Why?