Elements can be separated into simpler substance by chemical reactions.

a. True

b. False

The sphere is the layer of the earth that contains a mixture of gases

If an decrease in temperature accompanies a reaction, what occurred?

An atom has three full orbitals in its second energy level. How many electrons are present in the second energy level of the atom? 6 12 3 9

The chemical formula for glucose is C6H1206. Therefore, four molecules of glucose will have () carbon atoms () hydrogen atoms, and () oxygen atoms.

How do synthesis reactions and a decomposition reactions differ

There is inverse relation between pressure and diffusion in liquid phase? •True •False

What do you need in order to do a stoichiometric calculation? (Choose multiple) Balanced Chemical Equation Molar masses of compounds involved The type of reaction taking place Oxidation Numbers

The correct mathematical expression for finding the molar solubility (s) of sn (oh) 2 is:

18. which bond is most polar? H--F H--Cl H--Br H--I

What kind of reaction is ca (s) + h3po4 (aq) ca3 (po4) 2 (s) + h2 (g)