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everything that takes up space or has mass |
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substance that cannot be broken down. |
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small, yet essential elements. |
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Chemicals that make up 96% of body |
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Definition
Oxygen, Carbon, Hydrogen, Nitrogen |
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Definition
substance consisting of 2 or more different elements combined in a fixed ratio. |
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| compound with four or more elements. |
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| smallest unit of matter that retains properties of elements. |
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Definition
| subatomic particle with single positive electric charge. |
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Definition
| subatomic particle with single negative electric charge. |
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Definition
| Electrically neutral subatomic particle. |
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Definition
| atom's central core that holds protons and neutrons. |
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Term
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Definition
| number of protons in an atom. |
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Definition
| sum of protons and neutrons in the nucleus |
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| equals the mass number, since electrons weigh practically nothing. |
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| elements with the same number of protons and electrons, but different number of neutrons. |
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Definition
| when the necleus decays spontaneously, giving off particles and energy. |
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| unit of measurement- protons/neutrons= 1 dalton. |
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Definition
| detects locations of radioactive materials in body. hot spots. |
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| atoms held together by strong attractions. |
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Definition
| electrons in the outermost shell. |
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Definition
| atom or molecule with an electrical charge from gaining or losing electrons. |
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Definition
| when two ions of opposite charges attract and hold. |
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Definition
| synonym for an ionic compound. |
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Definition
| two atoms share one or more pairs of valence electrons. |
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Definition
| Two or more atoms held together by covalent bonds. |
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Definition
| two atoms share two pairs of electrons. |
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Definition
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| atom's attraction for shared electrons. |
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| molecules with only one element. |
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Definition
| unequal sharing of electrons. |
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Definition
| molecule with unequal distribution of charges. |
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Term
| Most Electronegative Element |
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Definition
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Definition
| weak bond between positive hydrogen atom in a polar covalent bond and a negative atom bonding between another molecule. |
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Definition
| tendency of molecules to stick together. |
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| clinging of one substance to another. |
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| measure of how difficult it is to stretch or break the surface of a liquid. |
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| cohesion and adhesion working together to move water up. ex:plants. |
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| amount of energy associated with the movement of atoms and molecules in a body of matter. |
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| measures heat intensity. average speed of molecules. |
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Definition
| keeps organisms from overheating. ex:sweat. |
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| less dense than liquid water. molecules spread more. |
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| liquid consisting of uniform mixture of two or more substances. |
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Definition
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| substance that is being dissolved. |
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Definition
| solution where water is the solvent. |
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Definition
| compound that gives hydrogen ions. |
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Term
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Definition
| compound that takes hydrogen ions. |
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Term
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Definition
| potential of Hydrogen. Describes how basic or acidic a solution is. 0-14. |
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Definition
| substances that minimize pH changes. |
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Term
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Definition
| number of hydrogen atoms goes down. |
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Term
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Definition
| number of hydrogen atoms goes up. |
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Definition
| neutral- pure water, H or OH. |
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| making or breaking of chemical bonds, causing composition to change. |
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Definition
| conversion of starting materials. |
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Definition
| end result of a chemical reaction. |
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Term
| Chemical Reactions in Most Living Things |
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Definition
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