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Chapter 2 - Biology
Studyguide
| Term | Definition |
|---|---|
| Acid | solutions that has more H+ than OH- are acidic (0-6) |
| Adhesion | Attraction between water molecule and other surfaces |
| Anion | A atom with more negative charges |
| Atom | basic unit of matter |
| Atomic Number | the number of protons in one atom of that element |
| Base | |
| Buffer | something that absorbs or releases H+ or OH- to keep pH level constant |
| Capillary Action | example water attracted to the glass sides of a tube |
| Chemical Bond | when atoms join together by sharing electrons or are pulled toegther by opposite charges |
| Chemical Reaction | when two or more atoms bond together or break apart |
| Cohesion | water molecules stick together (3) |
| Covalent Bond | Formed from the sharing of a pair of valence electrons by two atoms |
| Electron | have a negative charge (e-) |
| Electron Shell | - first electron (1n) shell hold 2 eletrons - Second and third electron (2n) hold 8 electrons |
| Electron Transfer | giving away or gain an electron |
| Electronegativity | a property of each elements (level of attraction an atom has to its electrons) |
| Element | O, Na, K, H, Zn, Ca, Cl, F, Fe, P, S, H, Mg, N |
| Evaporation | |
| Functional Group | group of atoms that gives special chemicals prperties to a molecules |
| Heat of vaporization of water | liquid to gas |
| Hydrogen bond | form between two polar molecules when the oppositely charged parts of the molecules are attracted to each other |
| Hydrophilic | molecules that can disscolve in water |
| Hydrophobic | cannot dissolve in water |
| Inert Gas | nonreactive |
| Ion | when atom loses or gains an electron (becomes charged) |
| Ionic Bond | form when two oppositely charged ions are attracted to each other |
| Isotope | atom of one element that have differing numbers of neutrons |
| Mass number | P + N = |
| Molecule | two or more atoms held together by a chemical bond |
| Neutron | have no charge |
| Nonpolar Covalent Bond | electrons are shared equally |
| Nucleus (atomic) | protons and neutrons |
| pH scale | measure of acidic and basic |
| Polar Covalent Bond | electrons are not shared equally |
| Product | O + 2H |
| Proton | positive charge |
| Reactant | H2O |
| Solvent | able to dissolve other substance |
| Surface Tension | ability of the hydrogen bond between water molecules at the surface to avoid breaking |
| Valence Shell | The outermost electron shell with at least one electron |
Created by:
Khanlena
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