Term
| Coeffiecient is where and what? |
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Definition
Big number in front of element symbol and
tells how many molecules
ex 2O
4Mg
7Ba |
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Term
| Subscript is where and what? |
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Definition
small number under element symbol and
how many atoms in the molecule
ex K^2
Pb^2 |
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Term
WORK
The formation of solid iron(III) oxide from the elements. |
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Definition
| 4 Fe (s) + 3 O2 (g) → 2 Fe2O3 (s) |
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Term
WORK
decomposition of gaseous ammonia (NH3 (g)) into its
elements |
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Definition
| 2 NH3(g) → 3 H2 (g) + N2 (g) |
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Term
WORK
combustion of methanol (CH3OH(l)) into carbon dioxide (g)
and water (g) |
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Definition
| 2 CH3OH (l) + 3 O2 (g) → 2 CO2 (g) + 4 H2O (l) |
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Term
|
Definition
Two or more substances react to form one product.
ex. A + B → C |
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Term
|
Definition
One substance breaks apart to form two or more substances.
ex. C → A + B |
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Term
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Definition
| Rapid reaction that produces a flame and most often involve hydrocarbons reacting with oxygen in the air (products: CO2 and H2O). |
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Term
|
Definition
aka FW
sum of the atomic weights of the atoms in a chemical formula (formula units). |
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Term
WORK
Calculate the formula weight of copper(II) phosphate |
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Definition
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Term
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Definition
aka MW
sum of the atomic weights of the atoms in a molecular formula. |
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Term
| Percent Composition formula |
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Definition
=(number of atoms)(atomic weight) x 100%
(FW of the substance) |
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Term
WORK
The %carbon by mass of a white powder is determined to be 42%. Is this powder cocaine (C17H21NO4) or just sugar (C12H22O11) |
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Definition
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Term
|
Definition
| the amount of matter that contains as many objects (atoms, ions or molecules) as there are atoms in exactly12 g of pure C-12. |
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Term
|
Definition
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Term
WORK
What is the molar mass of Fe2(SO4)3 |
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Definition
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Term
WORK
What is the molar mass of C2H6 |
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Definition
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Term
WORK
How many atoms are in 26.4 g of platinum? |
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Definition
| 8.15 x 10^22 platinum atoms |
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Term
WORK
What is the mass of 18.1 x 10^23 NH3 molecules? |
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Definition
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Term
WORK
How many methanol (CH3OH) molecules are in 8.32 g of CH3OH? How many H-atoms are in this sample? |
|
Definition
1.56 x10^23 molecules CH3OH and
6.25 x10^23 H-atoms |
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Term
WORK
The compound para-aminobenzoic acid (listed as PABA on your bottle of sunscreen) is composed of carbon (61.31 mass%), hydrogen (5.14 mass%), nitrogen (10.21 mass%), and oxygen (23.33 mass%). Find the empirical formula of PABA. |
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Definition
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Term
WORK
If the molar mass of a PABA derivative is 412 g/mol, what is the molecular formula? |
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Definition
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Term
WORK
How many grams of H2O will be produced if 45.3 grams of CO2 are formed in the combustion of octane (C8H18). |
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Definition
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Term
WORK
An iron ore sample contains iron(III) oxide which reacts with carbon monoxide to produce iron metal and carbon dioxide.
Calculate the mass (grams) of CO that can react with 0.150 kg of iron(III) oxide, and the mass of Fe formed. |
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Definition
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Term
|
Definition
| the reactant present in the smallest stoichiometric amount |
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Term
WORK
How many grams of chromium metal are
produced when 3.21 g of aluminum metal and
4.56 g of chromium(III) oxide react to
produce chromium and aluminum oxide? |
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Definition
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Term
WORK
When a 2.00-g strip of zinc metal is placed in an aqueous solution containing 2.50 g of silver nitrate, solid silver and zinc nitrate are formed.
a. Which is the limiting reactant?
b.How many grams of silver will form?
c.How many grams of excess reactant are left at the end of the reaction? |
|
Definition
a.silver nitrate
b. 1.59 g Ag
c. 1.52 g Zn |
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Term
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Definition
| the amount of product expected to be formed when all of the limiting reactant is consumed |
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Term
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Definition
| the amount of product actually obtained |
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Term
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Definition
Actual Yield
Theoretical Yield x 100% |
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