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19 Cards in this Set
- Front
- Back
- 3rd side (hint)
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atomic mass unit
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1 amu = 1.661 X 10 ^-24th g
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119
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mole
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1 mol of atoms = 6.02 X 10 ^23 atoms of an element
Since the actual masses of atoms are so small, the mole is used in order to give us a large enough quantity to work with in laboratory. |
119
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Atomic mass are based on...
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carbon- 12 isotope having an assigned mass of 12.0 amu
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Avogadro's number
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The number of "entities" (usually, atoms or molecules) in one mole.
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Chemical formula
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A combination of symbols of the various elements that make up the compound. The formula indicates what elements and how many atoms of each element make up one representative particle of that substance.
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formula weight of a compound
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The sum of the atomic weights of all atoms in the compound, as represented by its formula.
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chemical equations
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Uses formulas to describe a chemical reaction.
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How chemical equations are set up left to right
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-Reactants are written to the left side of the equation; the products are written to the right side of the equation. The are separated by a yield sign of an arrow →.
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The states of the reactants in chemical equations
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-The physicals states of the reactants are shown in parentheses: (g)gas, (s) solid, (l)liquid, and (aq) dissolved in water.
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chemical equation symbols
▲ → |
That heat/energy is required fot the reaction to occur.
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chemical equation symbols
Pt → |
The formula of a substance over the arrow means this substance is a catalyst.
A catalyst is a substance that speeds up the rate of a reaction. |
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Type of Chemical Reactions:
Combination Reactions |
Usually two elements/compounds join to form a single product/compound.
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Type of Chemical Reactions:
Decompostition |
A single reactant is broken down to form 2 or more products.
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Type of Chemical Reactions:
Single Replacement |
An element and a compound react to form a different element and a different compound.
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Type of Chemical Reactions:
Double Replacement |
Two compounds (usually aq) react to form different compounds. One of the products is either precipitate (not disolvable in water), a gas, or a molecular compound. In each of these cases, the ions forming the precipitate, the gas, or the molecular compound are no longer in aq.
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Type of Chemical Reactions:
Combustion |
A substance reacts with oxygen gas. Oxygen cause the product.
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Theoretical yield
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The maximum amount of product that can be produced based on the balanced equation for the reaction.
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Actual yield
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The amount of product produced when the reaction is carried out under laboratory conditions.
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the percent yield is measure of
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the efficiency of the reaction:
% yield= actual yield over theoretical yield X 100 |
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