In an oxidation-reduction reaction, oxidation is what happens when a reactant loses electrons
. Reduction occurs when a reactant
gains electrons
in the reaction.

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.