Questions from General Chemistry

Q: The energy, E, of a system represents the sum of

The energy, E, of a system represents the sum of the kinetic and potential energies of all particles within the system.

Q: Calculate ∆E for each of the following cases. a

Calculate ∆E for each of the following cases. a. q = +65 kJ, w = -22 kJ b. q = +200. kJ, w = -73 kJ c. q = -18 kJ, w = -40. kJ

Q: If q for a process is a positive number, then the

If q for a process is a positive number, then the system is (gaining/losing) energy.

Q: For an endothermic process, q will have a (positive/

For an endothermic process, q will have a (positive/negative) sign.

Q: How many anions are there in 5.00 g of calcium

How many anions are there in 5.00 g of calcium bromide?

Q: What is meant by potential energy? Give an example of an

What is meant by potential energy? Give an example of an object or material that possesses potential energy.

Q: The percent by mass of nitrogen is 46.7% for

The percent by mass of nitrogen is 46.7% for a species containing only nitrogen and oxygen. Which of the following could be this species? a. N2O5 b. N2O c. NO2 d. NO e. NO3

Q: Calculate the number of molecules present in each of the following samples

Calculate the number of molecules present in each of the following samples. a. 4.75 mmol of phosphine, PH3 b. 4.75 g of phosphine, PH3 c. 1.25 * 10-2 g of lead(II) acetate, Pb(CH3CO2)2 d. 1.25 * 1...

Q: A system absorbs 215 kJ of heat, and 116 kJ of

A system absorbs 215 kJ of heat, and 116 kJ of work is done on it. Calculate ∆E.

Q: What mass of sodium hydroxide has the same number of oxygen atoms

What mass of sodium hydroxide has the same number of oxygen atoms as 100.0 g of ammonium carbonate?