How much percent of energy presents at one level is available to the next trophic level

What are the standard ways to make a solution of known concentration? (select all that apply.) ?

You find a white granular substance in a jar in your cupboard. You suspect it may be either sugar or salt. How could you find out without tasting the substance?

insert the missing coefficients in the following partially balanced chemical equations S+6HNO=HSO4+NO+H2O

How are elements lithium sodium potassium rubidium and cesium organized on the periodic table.

If an atom is found to have an atomic mass equal to 3 times greater than carbon, what is its atomic mass?

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.