What does AS< 0 mean in a reaction?

A. The reaction was exothermic.

B. The reaction increased in order.

C. The reaction is at equilibrium.

D. The reaction was endothermic.

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

How many molecules are found in 1.32 mol of nacl?

Jose and eric were given four samples in lab. the results of their analysis are shown in the table. based on the data they collected, which sample is most likely a metal?