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| anything that occupies space and has mass |
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| changes that do not alter the basic nature of the substance |
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| the energy of motion (moving objects) |
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| the building block of an element, the smallest particle that still retains its special properties |
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| have negative charges equal in strength of the positive charge of the protons ( in the area around the atom [electron field]) |
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| a substance that breaks down into ions in a solution; can conduct an electrical current in solution |
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| formed when an atom looses of gains electrons (causes the atom to become positive of negative) |
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| substance that can not be broken down into simpler substances by ordinary chemical methods |
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| occur when a molecule is broken down into smaller molecules, atoms, or ions |
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| average of the atomic mass numbers of all the isotopes of an atom |
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| in the nucleus of the atom, has no charge |
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| a compound that lacks carbon (water) |
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| when two or more different atoms bind together to form a molecule |
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| have the same number of protons and electrons but vary in the number of neutrons they contain |
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| an isotope who exhibits radioactive behavior(formed from heavier isotopes that have decomposed to become more stable) |
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| a substance that increases the rate of a chemical reaction without becoming part of its product or being changed itself |
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| in the nucleus of the atom, have a positive charge |
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| a change that alters the composition of the suubstance |
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| region around the nucleus in which electrons occupy |
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| the atoms outermost electron shell, involved in bonding |
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| The sum of the protons and neutrons contained in its nucleus |
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| inactive or stored energy(batteries in unused toy) |
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| the building block of nucleic acid; made up of 5 carbon sugar nitrogen containing base and a phosphate group |
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| form when electrons are completely transferred from one atom to another |
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| ionic compound that dissociated into charged particles when dissolved in water |
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| when molecules share electrons |
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| Extremely week bonds formed when a hydrogen atom bout to one electron hungry nitrogen or oxygen atom is attracted to another electron hungry atom and the hydrogen forms a BRIDGE between them |
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| an organic compound containing nitrogen, carbon, hydrogen, and oxygen; the building blocks of proteins |
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| occur when two or more atoms or molecules combine to form a larger more complex molecule |
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| a switch between synthesis and decomposition reactions, bonds are both made and broken |
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| carbon containing compounds (ex. proteins carbohydrates fats) |
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