A typical infrared lamp emits 175 watts of energy. Calculate the total energy emitted in kcal by the infrared lamp after 12 hours. (1 watt = 1 J/s)

One type of cookie contains 53% carbohydrate, 43% fat, and 4% protein. Determine the percent of the calorie content of this cookie that is carbohydrate. 

On average, a television consumes 107 kWh of electricity per year. Calculate the kilojoules of electricity consumed in three years.

Do materials with high heat content always have a high temperature? Does a system always reduce its internal heat content if it performs work? How do kinetic energy and potential energy differ?

Which of the following has a higher amount of kinetic energy? A tennis ball with a mass of 0.061 kg and a speed of 145 km/h or a tractor with a mass of 1750 kg and a speed of 25 km/h?

A ball falls from the top of the table. At one point during its fall, the kinetic and potential energy of the ball are 12 J and 68 J, respectively. Calculate the total kinetic energy of the ball just before it strikes the floor.

Consider the enthalpy diagram below:

In each diagram, knowing two values of enthalpy change can give you the value of the third. If the diagram was for work instead of enthalpy, would the same relationship still hold true?

A chamber with a piston was filled with gas. The chamber was heated using a hot plate which supplied 300 J of energy

A. If the piston was fixed, what are the signs of q and w?

B. If the piston was allowed to move, what are the signs of q and w?

Which statement(s) is/are applicable for a gas expanding isothermally against a constant pressure of 2 atm?

a. The system absorbs heat.

b. The system releases heat.

c. No heat flows.

d. Work is done by the system.

e. Work is done on the system.

f. No work is done.

g. The temperature of the system decreases.

h. The temperature of the system increases.

Which of the following will have ΔH greater than ΔU?

I. 2 H₂(g) + O₂(g) → 2 H₂O(g)
II. MgSO₃(s) + 2 HI(aq) → Mg₂I(aq) + H₂O(l) + SO₂(g)
III. CO(g) + H₂O(g) → CO₂(g) + H₂(g)
IV. H₂SO₄(aq) + LiS(aq) → H₂S(g) + Li₂SO₄(aq)

Consider the following diagram that illustrates different states of a system. Derive an expression for the change in internal energy between State B and State D.

Calculate ΔU for the system if it releases 268 kJ of heat and has 94 kJ of work done on it.

The boxes below represent a thermodynamic system. The arrows pertain to the direction of heat and work applied or taken from the system with the length corresponding to their relative magnitudes. Identify which of the processes is endothermic.