Chemical science, because yeast is irreversible.
Chemical Change: Irreversible
Physical Change: Reversible
Flour eggs is physical and yeast to bread chemical
Physical
enzymes
physical change
A chemical change
that they are both science but in physical science they talk about physical changes and chemical changes
Yeast rising bread works because yeast (an organism) converts starch to carbon dioxide which makes bread grow. This can be seen as a chemical reaction (yeast converting starch to CO2 gas) or a physical reaction (the CO2 making the bread expand).
Chemical science is the study of chemical changes, i.e. changes that involve electron transfer, bond formation and the thermodynamics and kinetics involved in these changes. Physical science is a broader term that encompasses the study of natural phenomena. Chemical science can be considered as a part of physical sciences.
Chemical and physical changes are part of methods applied in science.
"A pure substance that cannot be broken down into other substances by chemical or physical means."-Prentice Hall California Physical Science
yeast is a type of fungis in science
Chemical (So says my science book for school)