2. When reactive metals react with dilute acids, the products are a salt, and hydrogen gas. Describe how to test for hydrogen gas. Write down what to do, and what you would observe
if hydrogen gas is present.

hi my dude or dudette

lol for the pointsss

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.