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Terms for Chapter 2
Term | Definition |
---|---|
Atom | The smallest unit of an element that maintains the chemical properties of that element |
Element | A substance that cannot be separated or broken down into simpler substances by chemical means; have same atomic # |
Compund | A substance made up of atoms of two or more different elements joined by chemical bonds. |
Ion | An atom, radical, or molecule that has gained or lost one or more electrons and has a positive or negative charge. |
Ionic Bond | The attractive force between oppositely charged ions, which form when electrons are transferred from one atom to another. |
Covalent Bond | Chemical bond formed when two atoms share one or more pairs of electrons. |
Molecule | |
Hydrogen Bond | |
Cohesion | Attraction between molecules of the same substance. |
Adhesion | Attraction between molecules of different substances. |
Solution | |
Solvent | |
Solute | |
Acid | Compound that donates a proton (H+) when dissolved in a solution. |
Base | Compound that accepts a proton (H+) when dissolved in solution. |
pH | |
Monomer | |
Polymer | |
Carbohydrate | Molecule composed of carbon, hydrogen, and oxygen; includes sugars and starches. |
Lipid | |
Fatty Acid | |
Portein | |
Amino Acid | Molecule that makes up proteins; composed of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. |
Nucleic Acid | |
Chemical Reaction | Process by which substances change into different substances through the breaking and forming of chemical bonds. |
Reactant | |
Product | |
Bond Energy | Amount of energy needed to break a bond between two particular atoms; or the amount of energy released when a bond forms between two particular atoms. |
Equilibrium | |
Activation Energy | Energy input necessary to initiate a chemical reaction. |
Exothermic | |
Endothermic | Chemical reaction that requires a net input of energy. |
Catalyst | Substance that decreases activation energy and increases reaction rate in a chemical reaction. |
Enzyme | Protein that catalyzes chemical reactions for organisms |
Substrate |