When energy is added or removed, is it a physical change, a chemical change, or both?

When lithium nitride, li3n (s), is treated with water, h2o (l), ammonia, nh3 (g), is produced. Predict the formula of the gas produced when sodium phosphide, na3p (s), is treated with water?

What is the reaction constant if the initial concentration of a contaminant is 100 mg/L, and its final concentration is 10 mg/L after a period of 2 hours and the reaction is characterized bya) Zero Order Kinetics

A helium balloon contains 0.48 g of helium. Given the molecular weight of helium is 4.0g/mol, how many moles of helium does it contain?

Bohrs model could only explain the spectra of what type of atom?

Which of these compounds would you expect to be least soluble in water? ch3oh nacl n2 nh3 not enough information?

Can the nature of a reactant be altered to speed up reaction

What describes the basis of the band theory of metallic bonding

Why isn't air travel based on hydrogen popular today? A. Hydrogen is very expensive B. Hydrogen is difficult to find C. Hydrogen is flammable and dangerous D. Hydrogen is too cold for travelers to stand on long trips

How to get 1m solution to 0.001m solution?

If something is in high resolution you can see and object but not very clearly. True or False.