21. Identify which statement below is a hypothesis, and explain why. How could you determine whether the hypothesis is correct?
a. Ocean water is too salty.
b. Water heats faster if it contains salt.
C. Space probes have discovered small amounts of water on the moon.

a polar bond is formed when electrons are shared unevenly between atoms

answer///carbon;

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.