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Biology Chapter 2

Compound substance containing two or more elements that are chemically combined in a fixed ratio.
matter anything that occupies space and has mass
element pure substance that can't be broken down into other substances by chemical means
nitrogen, hydrogen, oxygen, carbon What are the 4 main elements of life?
What is an isotope? an element with the same number of protons, but a different number of neutrons
molecule Two or more atoms held together by covalent bonds
ionic bonds The bond where electrons are transferred
covalent bond The bond where electrons are shared.
Polar molecule A molecule that has opposite electric charges on opposite ends
cohesion The tendency of molecules of the same kind to stick to one another.
adhesion The attraction between unlike molecules
Acid A solution with more H+ ions
Base A solution with more OH- ions
valence electrons Electrons involved in bonding (at the outermost shell)
hydrophilic Attracting water molecules
functional group A group of atoms within a molecule that interacts in predictable ways with other molecules.
dehydration Polymers are formed through a dehydration reaction.
Hydrolysis Polymers are broken down through a hydrolysis reaction
Created by: CLOP



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