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Bios1010 Ch. 2

Atoms, Molecules, and Life

QuestionAnswer
Atoms Smallest unit of matter
Element the same thing as an atom
Protons A positive charge inside an atom
Neutrons A neutral particle inside an atom
Electrons A negatively charged particle on the outer part of an atom/make stable or unstable
Ionic Highly charged unstable bond which is easily broken
Polar covalent slightly charged and stable
Non polar covalent neutral, highly stable bond
Free Radicals A molecule with an unpaired electron, makes it highly unstable and reactive with nearby molecules
Antioxidants Any molecule that reacts with free radicals, neutralizing their ability to damage biological molecules. Fruits and Veggies contain these.
Why is it important that water moderates the effects of temperature changes? It keeps our cells from freezing and boiling due to temp. changes.
Why is water as a solvent important it enables us to get the stored energy from over food and drinks.
Acid a substance that releases hydrogen ions when it dissolves in water
Base A substance that combines with hydrogen ions, reducing their number.
pH Scale Reflects the concentration of hydrogen ions in a solution
Buffer They neutralize acids and bases to bring body fluids close to 7 overall.
Created by: 1319220368
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