Definitions
Name the reaction
equations (500)
Symbols used in chemical equations
Miscellaneous (mostly on the final)
100
Define coefficient
Large numbers used to balance reactions
100
Mg(s) + O2(g) ----> MgO(s) 2 or more reactants and 1 product
Synthesis reaction
100
Balance the following equation: Na(s) + Cl2(g) -> NaCl(s)
2Na(s) + Cl2(g) -> 2NaCl(s)
100
->
Yields
100
In stoichiometry, what do we use to make a mole-to-mole ratio when doing conversion factors?
Bridge chart
200
What is the definition of the molecular formula?
Gives the actual number of atoms in a compound
200
C3H8(l) + O2(g) ----> CO2(g) + H2O(g)
Combustion reaction
200
How many moles of oxygen gas would be produced if 2.5 moles of mercury oxide is heated? 2HgO(s) -> 2Hg(l) + O2(g)
1.3 moles
200
"l"
Liquid
200
How do we count atoms in a chemical reaction if a coefficient is before a compound?
Multiply coefficient be number of atoms
300
Define limiting reactant
Substance that is completely used up in the reaction
300
HgO(s) ----> Hg(l) + O2(g) 1 reactant and 2 or more products
Decomposition reaction
300
Balance the equation: K(s) + H2O(l) -> KOH(aq) + H2(g)
2K(s) + 2H2O(l) -> 2KOH(aq) + H2(g)
300
"s"
Solid
300
What is the difference between the empirical formula and molecular formula?
Emperial formula gives ratios of elements in a compound while molecular formula give the actual number of atoms
400
What is the definition of the law of canservation of mass?
States that mass is neither created nor destroyed by chemical reactions or physical transformations
400
Al(s) + Pb(NO3)2(aq) ----> Pb(s) + Al(NO3)3(aq) 1 element “kicking out” another element
Single displacement
400
How many moles of ammonia are produced when 6 grams of hydrogen gas reacts with excess of nitrogen gas? 3H2(g) + N2(g) -> 2NH3(g)
2 moles NH3
400
"g"
Gas
400
How do we convert from grams of one substance to grams of another substance using a balanced equation?
Grams to mole-to-mole ratio to grams
500
Define stoichiometry
The relationship between the relative quantities of element measure substances taking part in the reaction
500
KI(aq) + Pb(NO3)2(aq) -> PbI2(s) + KNO3(aq)
Double displacement reaction
500
When 36.8g C6H6 react with an excess of Cl2, the actual yield of C6H5Cl is 38.8g. What is the percent yield of C6H5Cl? C6H6 + Cl2 -> C6H5Cl + HCl
(38.8g/53.03g C6H5Cl)= 73% yield
500
"aq"
Aqueous or in solution
500
Who leads the science club?
Mr.Ward
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