Balance this equation-

_P4 + _02 - -> _P203

Consider a beaker of water sitting on the pan of an electronic scale that has been tared. A metal weight hanging from a string is suspended in the water and the mass reading on the scale reads 0.13 g.

An element or compound which occurs naturally in the earth is a ___?

if I start with 2 moles of sodium bicarbonate, decomposition will produce 1 mole of sodium carbonate, 1 mole of water, and one mole of carbon dioxide. How many moles of water will be produced if you start with 4 mol of sodium bicarbonate

A reaction was predicted to produce 32.4 grams of a compound. When the product was measured, there were only 26.1 grams made. What is the percent yield of this reaction? a. 80.6% c. 24.1% b. 6.3% d. 58.5%

The pH of a solution is measured as 5.9. What is the hydrogen ion concentration of the solution? A. 1.3 x 10-6 M B. 7.9 x 105 M C. 5.9 M D. 5.0 x 10-9 M

Calculate the photon energy (in joules) for the light emitted from the hydrogen atom if ninitial = 4 and nfinal = 2.

The distance from one place to another

What is the purpose of a cell membrane

More polar solvents (eluents) move molecules more rapidly than less polar solvents. If you used a 1:1 hexanes:methanol mixture as solvent, would you expect the products to elute faster or slower?

C12 has 6 protons. how many neutrons does c13 have? a. 6 b. 7 c. 13 d. 19