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discovered negatively charged particles
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| published his first atomic theory in 1803 |
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proposed that in the center of the atom is a tiny positively charged part called the nucleus
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| proposed that atoms move in energy levels |
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| discovered a pattern to the elements in 1869 |
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| responsible for the dot diagram |
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| the study of matter & energy |
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| the ways in which scientists answer & solve problems |
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| possible explanation or answer to a question |
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| ties together hypotheses and observations |
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| summary of many experimental results |
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| law of conservation of mass |
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| during a chemical change, the total mass of materials formed equals the total mass of starting materials |
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| amount of matter in an object |
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| curve at the surface of a liquid |
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| examples of units use to measure volume |
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cubic centimeters (cm3)
liter (L)
milliliter (mL) |
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| measure of gravitational force exerted on an object |
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| tendency of an object to resist a change in motion |
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| affects 1+ physical properties of a substance |
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| describe matter based on its ability to form new substances |
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| characteristic properties |
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| most useful in identifying properties |
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| ability to bond & form new substances |
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| when 1+ substances are changed into new substances w/ new and different properties |
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| state of matter w/ a definite shape & volume |
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| has particles that have no specific arrangement |
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| particles of _____ move more quickly |
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| measure of how fast particles are moving |
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| for a fixed amount of gas @ a constant temperature, the volume of the gas is inversely related to its prssure |
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| for a fixed amount of gas @ a constant pressure, the volume changes the same way as the temperature |
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| change of a substance from one physical state to another |
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| is the reverse process of melting |
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| change of a substance from a liquid to a gas |
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| change in substance from a solid directly into a gas |
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| pure substance unable to be separated into simpler substances by physical r chemical means |
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| pure substance composed of 2+ elements that are chemically combined |
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| combo of 2+ substances that are not chemically combined |
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| solid solution of metals/nonmetals dissolved in metals |
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| formula for concentration |
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| colloids cannot be separated by... |
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| substance being dissolved |
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| believed to be a subatomic particle that "glues" quarks together w/ a strong nuclear force |
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| states that the repeating chemical and physical properties of elements change periodically with the element's atomic numbers |
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| about 20% of the air we breathe |
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| 80% of the air we breathe |
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| forms when electrons are transferred from one atom to another atom |
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| forms when atoms share 1+ pairs of electrons |
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