How many electrons does an atom of chromium have

All changes in chemistry are chemical? True or false?

Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water. Suppose 7.22 g of ethane is mixed with 15. g of oxygen. Calculate the minimum mass of ethane that could be left over by the chemical reaction.

When a mixture of PH3, P2, and H2 comes to equilibrium at 873 K according to the reaction 2PH3 (g) ←-→P2 (g) + 3H2 (g) Kp = 398 at 873 K, where Pp2 = 0.414 atm and PH2 = 0.827 atm.

What is the difference between a substrate, ligand, reactant and product?

If you move two objects with opposite charges apart, what happens to their potential energy? Explain your response.

Which particles make up the nucleus of an atom? protons and electrons neutrons and electrons protons only protons and neutrons neutrons only

2H2+O2 2H2O. Calculate the moles of water formed when 14 moles of hydrogen react.

What is the balanced formula for S8 + O2 - > SO3

What is the effect of the biogeochemical cycles? O O O O cycling energy through a food chain recycling matter through the biosphere recycling rocks through the layers of Earth cycling nutrients through the human body

Calculate the ratio of effusion rates of oxygen (o2) to hydrogen (h2)