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Chapter 3

QuestionAnswer
Atom the smallest unit of matter that cannot be broken down by chemical means
Element substance made up of atoms that have the same number of protons
Valence Electrons Electrons in the outermost level, or shell
Compound substance made of the bonded atoms of two or more different elements
Molecule a group of atoms held together by covalent bonds
Ion an atom or group of atoms that has an electric charge because it has gained or lost electrons
Cohesion the attraction of particles of the same substance
Adhesion Attraction between particles of different substances
Solutions a mixture in which ions or molecules of one or more substances are evenly distributed in another substance
Acid compounds that form extra hydronium ions when dissolved in water
Base compounds that form extra hydroxide ions when dissolved in water
pH measure of how acidic or basic a solution is
Buffer substance that reacts to prevent pH changes in a solution.
Carbohydrates molecules made of sugars
Lipid another class of biomolecules, which includes fats, phospholipids, steroids, and waxes
Protein is a molecule (usually a large one) made up of amino acids
Amino Acids building blocks that link to form proteins
Nucleic Acid long chain of nucleotide units
Nucleotide molecule made up of three parts: a sugar, a ase, and a phosphate group
DNA Nucleotides of deoxyribonucleic acid
RNA Nucleotides of ribonucleic acid
ATP adenosine triphosphate
Energy The ability to move or change matter
Reactant a substance that is changed in a chemical reaction
Product a new substance that is formed
Activation Energy the minimum kinetic energy that colliding particles need to start a chemical reaction
Enzyme molecule that increases the speed of biochemical reactions
Active Site the region where the reaction takes place
Subtrates The shape of the active site determines which reactants
Created by: bayere14
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