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13 Cards in this Set
- Front
- Back
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Law of Conservation of Mass |
Matter is not created or destroyed, only changed. The number of atoms in the reactants must be equal to the number of atoms in the product. Zn + 2HCl --> ZnCl₂ +2H |
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Chemical Equation |
A combination of chemical formulas used to describe what happens in a chemical reaction. The equation identifies the reactants and resulting products. 2H₂ + 2O₂ --> 2H₂O₂ |
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Reactant |
Formulas written on the left side of the arrow symbol ( -> ) are the starting substances in a chemical reaction. 2CO₂ --> 2C + 2O₂ |
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Yields |
An arrow symbol that shows a reaction has taken place. The reactants have reacted to produce a new substance ( the product ). H₂ + O₂ --> H₂O₂ |
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Product |
Formulas written on the right side of the arrow symbol ( -> ) are the new substances formed in a chemical reaction. 2Fe + O₂ --> 2FeO |
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Subscript |
A small number to the right of a symbol that is written below the normal line of letters to show how many atoms of an element are present in a substance. No subscript means there is only one atom present. CO₂ |
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Coefficient |
A number written in front of a chemical formula to show how many molecules of that substance are present. 2Na + 2Cl --> 2NaCl |
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Physical Change |
A change in which the characteristics of a substance are only changed physically and the original properties stay the same. dissolving, shape, size, |
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Chemical Change |
A change in which a substance (or substances) is changed into one or more new substances with different properties than the original substances. burning, corrosive, rusting |
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Symbol(s) |
One or two letters used to represent an element. H, Ne, O |
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Compound |
A substance composed of two or more elements chemically combined and in a definite proportion. H₂O, CO₂, CO |
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Chemical Formula |
When substances interact to form one or more new substances with different properties than the original substance. NaCl, H₂O, H₂O₂ |
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Chemical Reaction |
When substances interact to form one or more new substances with different properties than the original substances. H₂ (gas) + O (gas) --> H₂O (liquid) |
