Term | Definition |
What are some characteristics of Emulsions | A mixture of two substances such as water and grease, that do not dissolve in each other. Two types include; oil-in-water, and water-in-oil. Usually some kind of chemical is needed to keep the emulsion stable, so they do not separate. |
Define Suspension | Mixtures that contain large particles that settle out and form distinct layers. e.g. flavoured milk and paint. |
Define Colloids | Cloudy mixtures that remain suspended for long periods of time. |
Define Surface tension | Refers to the forces experienced by particles at the surface of a liquid, they are cohesive. They cause liquids to form 'droplets.' |
Define Surfactants | Wetting agents that make normally immiscible substances mix. |
Define Pharmaceuticals | Chemical substances that alter the biomedical process in our bodies in ways in which lead to improvement in health. |
Define Lubricant | reduce friction and wear between surfaces, by helping them to move smoothly past each other. |
Define Pesticides and give an example | materials that are able to selectively kill an animal considered to be a pest. E.g. any of the three: insecticides, rodenticides, fungicides |
Define Poisons | toxic substance that have an effect on the body |
Define Enzymes | a biological catalyst found in living things that helps control chemical reactions that are taking place. |
Define hydrophilic | 'Water loving' substances pr part of a substance. Mixes well with water. |
Define hydrophobic | 'Water hating' substances or part of a substance. Does not mix well with water. |
Define homogenous | uniform in structure or composition throughout. as of a chemical mixture |