Energetics Questions

Physical Chemistry

Energetics Solutions

Reactions that release energy have a △G, they are referred to as reactions.

Physical Chemistry

Energetics Solutions

Which of the following are examples of water releasing energy? Check all that are true. (A) condensation on a bathroom mirror after a hot shower (B) a puddle evaporating (C) a lake's surface water freezing over (D) frost on a windowpane caused by deposition (E) ice cubes melting

Physical Chemistry

Energetics Solutions

How many joules of energy must be added to completely convert 24.0 g of ice at 0 °C to liquid water at 0 °C? The heat of fusion of water is 334 J/g, and the heat of vaporiztion of water is 2257 J/g.

Physical Chemistry

Energetics Solutions

In each row, pick the compound with the bigger lattice energy. Note: lattice energy is always greater than zero. Which compound has the bigger lattice energy? SrCl2 RbCI MgS BaS LiBr Lil

Physical Chemistry

Energetics Solutions

Which of the following reactions are exothermic? (Select all that apply) * (A) H₂O(1) + SO₃(g) → H₂SO₄(I) △H = -135.5 kJ (B) H₂O(l) → H₂(g) + O₂(g) △H = +285.8 kJ (C) C₆H₁₂O₆ + O₂ → CO₂ + H₂O △H = -686 kJ (D) ATP + H₂O → ADP + P △H = -4852.3 kJ (E) ADP + P → ATP + H₂O △H = +7.3 kJ (1) Reaction 1 (2) Reaction 2 (3) Reaction 3 (4) Reaction 4 (5) Reaction 5

Physical Chemistry

Energetics Solutions

How many Joules are required to heat 250.0 grams of liquid water from 0 to 100 C? (A) 100,000 J (B) 199,000 J (C) 240,000 J (D) 76,000 J

Physical Chemistry

Energetics Solutions

Under normal room conditions (standard pressure at about 20°C), water will not boil, so we do not observe H₂O(l) + 40.7 kJ – H₂O(g). At this temperature, the process is [ Select ] because [ Select ].

Physical Chemistry

Energetics Solutions

Using the following equations and Hess's Law, find the enthalpy change of the reaction D₂(g) + E₂(g) --> 2DE(g) Remember to include correct units and to round to the nearest 0.01 D₂(g) + 2E₂(g) --> 2 DE₂(g) △H = 65.10 kJ 2DE(g) + E₂(g) --> 2 DE₂(g) △H = -296.73 kJ

Physical Chemistry

Energetics Solutions

4C (s) + 5H₂ (g) → C₄H₁₀ (g) △H° = -125.6 kJ/mol (1) A line graph representing the energy changes in the reaction. (2) An LOL graph modeling changes in chemical and thermal energy.

Physical Chemistry

Energetics Solutions

Water (2630 g) is heated until it just begins to boil. If the water absorbs 4.91×10⁵ J of heat in the process, what was the initial temperature of the water?

Physical Chemistry

Energetics Solutions

Define 'Enthalpy' A. Energy stored in the movement of molecules in a substance B. The temperature of a molecule C. Energy stored in the chemical bonds in a substance D. The opposite of temperature

Physical Chemistry

Energetics Solutions

Define the term Exothermic by picking the correct statements A. ∆H is negative B. Products have less energy than the reactants C. products have more energy than the reactants D. Energy is given out to the surroundings (temperature goes up). E. ∆H is positive