A pure substance that cannot be broken into simpler substances by physical or chemical means

When you push down on a block resting on a table, block atoms and table atoms that are in contact with one another A. move closer to one another B. break their bonds with one another C. move past each other D. maintain their positions

A certain atom has 22 protons and 19 electrons. This atom loses an electron. The net charge on the atom is now. If this same atom with 22 protons and 19 electrons were to gain 3 electrons, the net charge on the atom would be.

Pure msg, a common flavor enhancer, exhibits a specific rotation of + 24. calculate the ee of a solution whose [α] is + 11.

How many moles are equal to 1.2 x 1021 molecules of lithium?

Which statement is true of an activated complex formed during a chemical reaction? It contains all the atoms of the reactant particles. It is a stable collection of reactant atoms. It is only formed in the forward direction.

Number of hydrogen atoms in NaC2HO4

Calculate the pH for an acid that has a [H+] of 5.8 x10^-11 M.

Complete the lewis dot structure for h2co (in which both h atoms are bonded to c).

Do substances have to be cold to freeze?

Which statement is true of the carbon atoms that make up a diamond? A. They can slip past one another slowly. B. They are always vibrating in place. C. They vibrate only when they are heated. D. They are locked in place and do not move at all.