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Biology Chapter 9 Study Guide

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1. What is Biology?
Biology is the science of life. The people who study the growth, function, structure, origin, evolution and distribution of living organisms are called Biologists. There are nine main fields of Biology and each field can have many subfields within it. They are the following fields:
1. Biochemistry: the study of the material substances that make up living things
2. Botany: the study of plants, trees, flowers, and it also includes agriculture
3. Cellular biology: the study of the basic cellular units of living things
4. Ecology: the study of how organisms interact with their environment and one another
5. Evolutionary biology: the study of the origins and changes in the diversity of life over time
6. Genetics: the study …show more content…

How do different stain removers work?
There are many different stain removers for sale. Many of these solutions attack the stain differently which may make a particular stain remover better for certain stains. Their effectiveness can depend on the size of the molecules, the polarity, and the solubility of the molecules.
Water is considered the “universal solvent”. This is because it being a bent polar molecule which allows it to remove stains from other polar molecules. Water is inorganic so it works well at dissolving other inorganic substances. Water is very good at delivering detergents, which are also known as surfactants, to the stain. This is why water is used frequently in stain removal.
Surfactants, also known as detergents, are molecules that have a non-polar end and a polar end. They can blend compounds that normally are not soluble in water alone. Substances that would normally stay separate in water will not when there is a surfactant mixed in with it.
Phosphates are compounds that have a phosphate and an ionic charge. They work well against stains that have iron oxide in it. The phosphate will create a chemical reaction that will remove the stain called displacement. An example of this would be a blood

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