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Chapter 4
Biology Terms for retest
34
Biology
9th Grade
11/09/2008

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Term
Matter
Definition
anything that occupies space and has mass
Term
Element
Definition
a pure substance that can not be broken down by chemicals
Term
Trace elements
Definition
elements that make up less than 0.01% of your body mass
Term
Compound
Definition
substance containing two or more elements that are chemically combined in a fixed ratio
Term
Compound
Definition
A substance containing two or more elements that are chimically combined
Term
Atom
Definition
smallest possible particle of an element
Term
Proton
Definition
a single unit with a positive charge
Term
Electron
Definition
a particle with a negative charge
Term
Neutron
Definition
particle that has a neutral charge
Term
Nucleus
Definition
a central core where protons and neutrons are packed together
Term
Atomic Number
Definition
number of protons in the nucleus
Term
Isotopes
Definition
one of several forms of an element, each containing the same number of protons in their atoms but a different number of neutrons
Term
Radioactive Isotope
Definition
isotope in which the nucleus decays (breaks down) over time, giving off radiation in the form of matter and energy
Term
Ionic Bond
Definition
chemical bond that occurs when an atom transfers an electron to another atom
Term
Ion
Definition
atom that has become electrically charged as a result of gaining or losing an electron
Term
Covalent Bond
Definition
chemical bond that forms when two atoms share electrons
Term
Molecule
Definition
two or more atoms held together by covalent bonds
Term
Chemical Reaction
Definition
breaking of old and formation of new chemical bonds that result in new substances
Term
Reactant
Definition
starting material for a chemical reaction
Term
Product
Definition
material created as a result of a chemical reaction
Term
Polar Molecule
Definition
molecule in which opposite ends have opposite electric charges
Term
Hydrogen Bond
Definition
bond created by the weak attraction of a slightly positive hydrogen atom to a slightly negative portion of another molecule
Term
Cohesion
Definition
tendency of molecules of the same kind to stick to one another
Term
Adhesion
Definition
attraction between unlike molecules
Term
Thermal Energy
Definition
total amount of energy associated with the random movement of atoms and molecules in a sample of matter
Term
Temperture
Definition
measure of the average energy of random motion of particles in a substance
Term
Solution
Definition
uniform mixture of two or more substances
Term
Solvent
Definition
substance in a solution that dissolves the other substance and is present in the greater amount
Term
Solute
Definition
substance in a solution that is dissolved and is present in a lesser amount
Term
aqueous solution
Definition
solution in which water is the solvent
Term
Acid
Definition
compound that donates H+ ions to an aqueous solution and measures less than 7 on the pH scale
Term
Base
Definition
compound that removes H+ ions from an aqueous solution and that measures more than 7 on the pH scale
Term
pH Scale
Definition
a range of numbers used to describe how acidic or basic a solution is; ranges from 0 (most acidic) to 14 (most basic)
Term
Buffer
Definition
substance that maintains a fairly constant pH in a solution by accepting H+ ions when their levels rise and donating H+ ions when their levels fall
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