Example #2: Preservatives, like salt, help keep food fresh. Katie made 12 loaves of bread using the same recipe and baking method. In 6 of them she used salt, in 6 of
them she used no salt. After the loaves were baked, she placed each of the loaves in a
plastic bad and left them close together on the counter in the kitchen. Each day she
looked at them to see if any mold had started to grow.
What is the control group?
What is the experimental group?
What is the independent variable?
What is the dependent variable?

i'm wiling to try and you : )

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.