What kind of changes are permanent and alter the identity of a substance

Which process is a chemical change? burning a match boiling water melting ice breaking glass

A solution of 0.393 m ba (oh) 2 required 32.24 ml of a 0.227 m solution of hn03 calculate the original volume of the ba (oh) 2 soluion

What is a simple circuit and a parallel circuit

For the reaction i2 (g) + br2 (g) ←-→2ibr (g), kc=280 at 150 ∘c. suppose that 0.520 mol ibr in a 2.00-l flask is allowed to reach equilibrium at 150 ∘c. part a what is the equilibrium concentration of ibr?

H2 and Fe represent

How many moles of neon (Ne, 20.179 g/mol) are in 68.4 grams of neon

A 50.00 mL sample of groundwater is titrated with 0.0300 M EDTA. Of 12.40 mL of EDTA is required to titrate the 50.00 mL sample, what is the hardness of the groundwater in molarity and in parts per million of CaCO 3 by mass

Why openness is important to the progress of science?

At a certain temperature the rate of this reaction is second order in NH4OH with a rate constant of 34.1 M^-1s^-1: Suppose a vessel contains NH4OH at a concentration of 0.100M.

If you go into the lab and dissolve 2.11 g of magnesium chloride in enough water to make 1500 ml of solution, what is the molarity of the resulting solution?