Which process is spontaneous? electrolysis of water into oxygen and hydrogen spreading of a strong fragrance of perfume in a room separation of sodium and chlorine from sodium chloride removal of iron fillings from a mixture by using a magnet?

At a certain temperature the vapor pressure of pure benzene is measured to be 322. torr. Suppose a solution is prepared by mixing 138. g of benzene and 91.2g of heptane. Calculate the partial pressure of benzene vapor above this solution.

By 1700, how many elements had scientists discovered and isolated? a. 13 b. 27 c. 46 d. 7

The process of isotopes breaking down and emitting particles, such as alpha or beta, to form a new substance.

A first order reaction has a rate constant of 0.816 at 25 oC. Given that the activation energy is 22.7 kJ/mol, calculate the rate constant at 34 oC. (enter answer to 3 decimal places)

Brian has an object suspended in the air. It has a mass of 100 kg and is 25 meters above the ground. What is the object's potential energy

Phosphorus forms a number of oxohalides, x3po, in which x may be a f, cl, or br atom. the most common of these, phosphoryl chloride, is obtained as follows:

Which statement is true about the speed of light waves in a medium? a. Depends on the temperature of the light wave b. Decreases with a decrease in density of medium c. Decreases with an increase in density of medium d.

What's a certain indicator that a molecule is polar? the molecule has a nonpolar covalent bond and the dipole is cancelled due to symmetrical arrangement of atoms the molecule has a polar covalent bond and the dipole is cancelled due to symmetrical

In the synthesis of barium carbonate from an alkali metal carbonate (M2CO3 where M is one of the alkali metals) a student generated 3.7 g of barium carbonate from 2.0 g of their alkali metal carbonate.

Give the state of matter that water is in as it moves through earths system