Sig Figs & Scientific Notation
Nomenclature
Ionic Equations
Percent Yield
Unit Conversions and Stoichiometry
100
7.87e-5 has this many sig figs.
What is three?
100
The chemical formula for this compound is KI
What is potassium iodide?
100
This is the net ionic equation of the rxn between NaOH and hydrochloric acid.
What is H3O^+ (aq) + OH^- (aq) --> 2H2O (l)?
100
If you got a percent yield higher than this number, you definitely went wrong somewhere in your experiment.
How much is one hundred percent?
100
H2 (g) + C2H4 (g) --> C2H6 (g). This many moles of ethylene (C2H4) is required to SYNTHESIZE 0.898 moles of ethane (C2H6).
How much are .898 mol ethylene?
200
This is the quotient of 75.75 divided by 8.96352
How much is 8.8451?
200
The chemical formula for this compound is PCl5
What is phosphorus tetrachloride?
200
This is the net ionic equation of AgNO3(aq) + KCl(aq) AgCl(s) + KNO3(aq)
Ag^+ (aq) + Cl^- (aq) --> AgCl (s)
200
A reaction yields 4.29 grams of product, when the theoretical yield is 5.10 grams. What is its percent yield?
How much is 84.1%
200
Given the reaction 2BrF3 (g) --> Br2 (g) + 3F2 (g), this many moles of bromine trifluoride are necessary to form .898 moles of fluorine gas.
How much is .599 moles of fluorine gas?
300
This is the answer, to the proper amount of sig figs of 15.64-17.935
What is -2.30?
300
The chemical formula for this compound is AgH.
What is silver hydride?
300
TWO Parter (1.5 times the points). Finish the chemical equation and write its net ionic one: K3PO4(aq) + Al(NO3)3(aq) -->
What is K3PO4(aq) + Al(NO3)3(aq) --> AlPO4 (s) + 3KNO3 (aq)? What is Al^3+ (aq) + PO4^3- (aq) --> AlPO4 (s)?
300
It is desired to produce 13.3 grams of phosphorus trichloride from a reaction of elemental phosphorus with chlorine gas. If the percent yield of phosphorus trichloride is 87.0 %, how many grams of phosphorus (P4) would need to be reacted?
How much are 3.45 grams?
300
An iron nail rusts when exposed to oxygen. When solid iron reacts with oxygen gas, rust (iron (III) oxide) is formed. If the system contains 0.172 moles of iron and .192 moles of O2, what is the limiting reactant and how much product can form?
What is iron, and how much is .0860 (8.60e-2 moles) mol?
400
One would record a buret with marks to the tenths place to this value.
What is the hundredths' place?
400
TWO-PARTER (worth 1.5 points if gotten correct :). The chemical formula for this compound is CaCl2 * 2H2O, and this is the term used to describe this compound when there is no water in its lattice structure.
What is calcium chloride dihydrate?
What is anhydrous?
400
THREE (!!) parter!! Write out the total ionic equation for: Ni(NO3)3(aq) + KBr(aq) -->, and does a reaction occur?
Ni^3+ (aq) + 3NO3^- (aq) + 3K^+ (aq) + 3Br^- (aq) --> Ni^3+ (aq) + 3Br^- (aq) + 3K^+ (aq) + 3NO3^- (aq). And why not?
400
The boride Ta3B2 is made by the direct combination of tantalum and boron at high temperature. How much boron must react with excess tantalum to prepare 125 g of Ta3B2 if the yield of the reaction is 88.4%?
How much are 5.42 grams?
400
9.00 grams of butane (C4H10) participate in a combustion reaction with 19.0 grams of oxygen gas. This is the limiting reactant, and this much of the excess reagent will remain (in grams) after the reaction is completed.
What is O2/oxygen gas, and how much is 3.69 grams?
500
There are this many sig figs in the number 500
What is ambiguous?
500
This is the formula for sodium selenite.
What is Na2SeO3?
500
This is the rxn of: chromium(III)nitrate(aq) + iron(II)sulfate(aq) --> chromium(III)sulfate(aq) + iron(II)nitrate(aq).
What is no reaction?
500
Niobium(II) oxide can be prepared by reaction of niobium(IV) oxide with hydrogen at high temperature:
- NbO2 + H2
NbO + H2O
The reaction of 411.3 g of NbO2 with excess H2 yields 305.2 g of NbO. Calculate the theoretical yield of NbO (assuming complete reaction) and its percentage yield.
How much are 358.6 grams and 85.11%
500
para-Xylene (C8H10) has a density of .866 g/(cm^3), and it participates in a combustion rxn. This is the mass of CO2 that forms when 27.6mL of para-Xylene reacts in the presence of excess oxygen.
How much is 79.2 grams?