Which of the following is true regarding phase changes?

A. Condensation is the reverse of evaporation.

B. Melting is the reverse of deposition.

C. Freezing is the same as sublimation.

D. Sublimation is the same as boiling.

How to balance this equation: Cu (s) + O2 (g) - - > CuO (s)

1. Ethylene glycol, commonly used in antifreezes, contains only carbon, hydrogen, and oxygen. When a sample of it is combusted in air, a 23.46 g sample produces 20.42 g of water and 33.27 g of carbon dioxide. Determine its empirical formula.

At a given temperature, the vapor pressure of heptane is 92.0 torr and the vapor pressure of octane is 31.2 torr. Assuming ideal behavior, what is the vapor pressure of a solution that contains three times as many moles of octane as heptane?

58.5g of sodium iodide are dissolved in 0.5dm3. what concentration would this be?

In a Michael reaction, an a carbon attacks the b carbon of an a, b-unsaturated carbonyl compound to afford a 1,5-dicarbonyl compound.

Which statements describe abiotic factors in an environment?

A ball rolling across the ground in Death Valley will slow and eventually stop. Why? - the ball's kinetic energy evaporates. - the ball's force is destroyed. - the friction of the ball changed the force to negative ions.

Calculate ∆h0 for the following reaction. br2 ( g. → br2 (l) ∆hf0 br2 ( g. = 30.91 kj/mol; ∆hf0 br2 (l) = 0 kj/mol)

Ethyl alcohol has a latent heat of vaporization of 850 J/g. Water has a latent heat of vaporization of 2260 J/g. Container A contains 1.0 kg of ethyl alcohol. Container B contains 1.0 kg of water. Both liquids are brought to a boil.

The greatest composition by mass in an atom 17/8 O is due to the total mass of its