The highest level of scientific experiment is known as experimental, or randomized control. In this type, as the name implies, there is the greatest amount of control. There are at least two groups used in this type of scientific experiment. Each group is made up of subjects that resemble each other as close as possible, such as by age, gender, etc. Subjects can be human, animal or the environment.
Chemical changes can result from the combination of different substance through a reaction to give one or more different substances. Decomposition, the opposite of combination, involves the breakdown of a single substance into two or more different substances.
Britiani. Chemical change is any change that results in the formation of new chemical substances. At the molecular level, chemical change involves making or breaking of bonds between atoms. These changes are chemical: Vocabulary. carbohydrate chemical bond chemical property physical property property protein. 1  iron rusting (iron oxide forms). 2  gasoline burning (water vapor and carbon dioxide form). 3  eggs cooking (fluid protein molecules uncoil and crosslink to form a network).