compounds and elements
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| compound | pure substance, combinations of elements, the same throughout, broken down to the smallest molecule
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| element | purest substance that cannot be broke down any further, the smallest amount, atoms
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| pure substance | compound or element, one single substance
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| law of constant proportions | no matter the amount, the ratio will stay the same, berthollet and proust
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| atom | smallest amount that maintains its properties
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| molecule | smallest amount of compound that maintains its properties
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| coefficients | indicates how many molecules there are, can change to balance equation, ex. 2HCl
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| subscript | indicates how many molecules there are, cannot change to balance equation, ex. H(little)2
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| ( ) | effects whatever is inside, ex. (OH)v2
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| yields | goes to, --->
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| synthesis | when substances come together to make one
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| decomposition | when a substance splits apart to make many
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| single replacement | when one element replaces another in a compound , ex. AB + C ---> AC + B
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| double displacement | when the elements in two compound switch pairings, matching the insides together and the outsides together ex. AB + CD ---> AD + CB
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| diatomic molecules | Clv2,Iv2,Fv2,Brv2,Ov2,Hv2,Nv2 v=subscript
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| combustion | when a fuel reacts with oxygen and yields to water and carbon dioxide, ex. CHv4 + Ov2 ---> Hv2O + COv2
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| electron | negatively charged particle, e-
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| ion | an atom with a charge due to fewer or extra electron
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| cation | positively charged ion
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| anion | negatively charged ion
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| electrodes | give electrons, take electrons
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| cathode | negative electrode, electron supplier, attracts cations
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| anode | positively charged electrode, electron taker, attracts anions
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| hydronium | hydrogen ions
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| hydroxide | OH-
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| base | ph of 7-14, includes OH-
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| acid | ph of 1-7, has only H
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| photosynthesis | opposite of combustion
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Created by:
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