The proportion of dissolved substances in seawater is usually expressed in

A. parts per hundred.

B. parts per thousand.

C. parts per ten thousand.

D. parts per million.

How does cycling of matter occur in earth's mantle?

One mole of which of these compounds contains two moles of hydrogen atoms? f NaOH g H2S h CH4 j NH3

What are metals and glass both conductors of?

Which of the following best defines an acid? An acid has a pH of 7. An acid has hydroxide ions. O An acid has fewer positive ions in solution. An acid has more hydrogen ions in solution.

According to collision theory, which condition (s must be met in order for molecules to react?

Why is photosynthesis so important to plants, and can't animals use it?

One way the government of Kim Jong-il controls the lives of the people who live in North Korea is by a. requiring every citizen to vote. b. controlling information its people receive from the outside world. c. enforcing free trade with other nations.

Give reasons 1) copper utensils and sheets become blackish after some days

Predict the spontaneity of a reaction (and the temperature dependence of the spontaneity) for each possible combination of signs for? H and? S (for the system).

At 29°C, Kp = 5.3 ✕ 102 atm-2 for the following reaction. N2 (g) + 3 H2 (g) equilibrium reaction arrow 2 NH3 (g) When a certain partial pressure of NH3 (g) is put into an otherwise empty rigid vessel at 29°C, equilibrium is reached when 55.