Which is not true of binary compounds? a. these contain only two elements. b. the name of the positively charged nonmetal ion is changed to end in –ide. c. the positively charged metal ion is written first. d. these usually consist of a metal and a nonmetal.

gas

explanation:

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58750.08068 is the answer i think

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.