Which electron configuration represents an

excited state for a potassium atom?

(1) 2-8-7-1 (3) 2-8-8-1

(2) 2-8-7-2 (4) 2-8-8-2

What is more inflammable? gasoline or ethanol?

What type of bonds form salt crystals

What is the value (in V) of Eºcell for the following reaction? Zn2 + (aq) + Pb (s) → Zn (s) + Pb2 + (aq)

Which is the least dense? copper mercury water wood

Writing about interesting place in your country

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.