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Which of the following statements is false about ionic bonding?
2
lonic compounds are composed of cations and anions bound by ionic
bonds.
O All of these statements are true; there are no false statements.
O The crystals of ionic compounds are made of simple repeating units.
These repeating units are arranged to form a crystal lattice.
O lonic compounds are also called salts.

gas

explanation:

smoke is the matter of a gas

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.

they are called fossil fuels