Term
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Definition
| an atom, molecule, ion, or a combination of cations and anions that gives a balance of charges. Anything represented by a chemical formula |
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Term
| What is a balanced equation? |
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Definition
| a chemical equation that has the same number of atoms on both sides. |
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Term
| What is the law of conservation of matter? |
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Definition
matter is not created or destroyed in chemical reactions
mass of reactants=mass of products |
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Term
| What is the atomic theory? |
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Definition
| atoms are not created or destroyed in chemical reactions |
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Term
| What happens in a combination reaction? |
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Definition
two or more elements form one product
or simple compounds combine to form one product |
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Term
| What happens in a decomposition reaction? |
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Definition
| one substance splits into two or more simpler substances |
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Term
| What are combustion reactions? |
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Definition
| reactions with O2 in the air that produce heat and light and oxide products. |
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Term
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Definition
| compounds that contain just carbon and hydrogen |
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Term
| What happens when hydrocarbons combine with oxygen in the air? |
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Definition
| the products are water, carbon dioxide, and a flame(heat and light) |
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Term
| What is formula mass(weight)? |
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Definition
| the sum of the average atomic masses of all the atoms in a formula unit in amu's |
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Term
| How do you find the percentage composition of a compound? |
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Definition
% element A=mass from element A
total coumpound mass X 100 |
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Term
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Definition
| an amount of substance containing the same number of formula units as there are in 12.000g of 12C |
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Term
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Definition
| 6.022 X 1023 formula units |
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Term
| what is avogadro's number? |
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Definition
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Term
| What does the formula weight of a substance in grams equal? |
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Definition
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Term
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Definition
| the mass in grams of one mole of a substance and is numerically equivalent to the formula weight. |
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Term
| What is a molecular formula? |
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Definition
| a formula that gives the actual number of atoms or moles of each element in a compound. |
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Term
| What is an empirical formula? |
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Definition
| a chemical formula that gives the smallest whole number ratio of atoms or moles of each element in a compound |
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