If a potassium atom has an atomic number of 19 and a mass number of 39, how many protons, electrons, and neutrons are in the atom?

A balloon filled with helium occupies 20.0 l at 1.50 atm and 25.0◦c. How many moles of helium will there be in the balloon at stp?

Use the term chloroplast and organelle in a sentence

Why is nucleus configured the brain of the cell

A student noticed while doing the neutralization experiment that the calorimeter kept getting warmer. how would this error affect the final calculation for the δhneut of each reaction? would it be overestimated, underestimated or remain unaffected?

Planck's constant relates the Joules of energy absorbed/released by matter to the: A. atomic number of the element B. observed wavelength of light C. speed of light D. mass of the particulate matter

You have obtained a gas chromatogram of a two component mixture of compounds A and B. The height of peak A is 3.96 cm. and the width at half height is 1.25 cm. The height of peak B is 4 cm. and the width at half height is 1.17 cm.

What would happen if leaching did not orrur?

Where does geothermal energy come from? A. sunlight B. the oceans C. the land D. inside Earth E. wind

Dimethylnitrosamine (CH3) 2N2O, is a carcinogenic formed in foods from nitrite ions used as preservatives. Calculate each of the following for this compound. Show all work for full credit. a. molar mass b. What is the % N

Does biomass energy come from petroleum?