Chemistry--Genoa
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| atomic mass | the sum of the numbers of protons and neutrons in the nucleus of an atom
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| physical property | a property that can be observed or measured without changing the matter's identity
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| physical change | a change that affects one or more physical properties of a substance
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| chemical property | describes matter based on its ability to change into new matter that has different properties
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| chemical change | happens when one or more substances are changed into new substances that have new and different properties
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| atom | the smallest unit of an element/matter that has the properties of that element
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| electron | a subatomic particle that has a negative charge
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| nucleus | an atom's central region which is made up of protons and neutrons
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| proton | a subatomic particle that has a postive charge and is found in the nucleus of an atom
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| neutron | a subatomic particle that has no charge and is found in the nucleus of an atom
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| atomic number | the number of protons in the nucleus of an atom
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| element | a substance that cannot be separated or broken down into simpler substances by chemical means
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| metal | an element that is shiny and that conducts heat and electricity well
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| nonmetal | an element that conducts heat and electricity poorly
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| molecule | two or more elements chemically bonded; can be the same element or different elements (O2, H2O)
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| compound | a substance made up of atoms of two or more different elements joined by chemical bonds
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| mixture | a combination of two or more substances that are not chemically combined
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| exothermic | a chemical reaction in which heat is released to the surroundings; (temperature increases)
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| endothermic | a chemical reaction that requires heat; (temperature decreases)
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| precipitate | a solid that is produced as a result of a chemical reaction in a solution of liquids
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| Aristotle | a Greek scholar who thought all matter was made of only 4 elements: earth, water, fire, air
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| Democritus | a Greek scholar who was the first to use the word "atom" meaning "uncuttable"
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| Bohr | man who determined electrons move in different energy levels called "shells"
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| Chadwick | man who discovered the neutron
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| Dalton | man who determined compounds form by combining atoms of different elements; first to start using Democritus' word "atom" again in the 1800s
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| Rutherford | man who discovered the proton and nucleus and that most of an atom is empty space
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| Thomson | man who discovered electrons
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Created by:
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mrsgilbert
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