In chemistry, some changes are reversible and some are irreversible, explain.

When aqueous solutions of MgSO4 and Na2CO3 are mixed, does a precipitate form, and if yes, what is it?

12 Two molecules of HBr collide and then form H2 and Br2. During the collision, the bonds in the HBr molecules are

Compute 4659¯0-214¯00. Round the answer appropriately. Express your answer numerically using the proper number of significant figures.

Characteristics: Sometimes called a "dirty snowball".; Has a hydrogen cloud.; Has a coma and a nucleus.; Invisible except when near the Sun. This is a description of a (n) A) comet B) asteroid C) meteor D) star

Which of the following is a hydrogeneous mixture

What atom has 14 protons and 14 electrons

What is a diagram showing the forces acting on a coasting bike rider traveling at 25 km/h on a flat roadway

Do all electromagnetic waves travel at the same speed?

Which of the following has the greatest first ionization engergy li, be, b or c

If we know that 10.0 cm3 of ice has a mass of 9.19 g what is the density of ice