Chemical Rxns
Predict the products (chemical formula) of:
iron (III) + nickel (II) chlorate -->
Fe(ClO3)3 + Ni
What is the study of stoichiometry?
What are the 3 forces that affect solubility?
1) attraction (forces) of solute particles to each other
2) attraction of solute particles to solvent particles
3) attraction of solvent particles to each other
What is the correct name for HI (aq)?
hydroiodic acid
HClO2 --> 68.46 g/mol
Predict the products (chemical formulas) for: magnesium chloride + ammonium phosphate --> ?
Mg3(PO4)2 + NH4Cl
6.022 X 1023 molecules
Calculate the molar concentration for the following: 18.95 g of LiOH in 1.71 L
0.463 mol/L
What is the purpose of the pH scale?
To convert extremely tiny numbers (ie. concentration of H+ ions) into a "user-friendly" scale
Which compound has the greater percent composition of oxygen: CO2 or NO2?
CO2
What is the complete, balanced chemical equation for when solid zinc carbonate decomposes?
ZnCO3(s) -> ZnO(s) + CO2(g)
What is the molar mass of Al(OH)3? Round to two decimal places.
78.01 g/mol
What volume of the stock solution is needed to make 325 mL of a 1.40 mol/L acid from a 8.00 mol/L stock solution?
56.9 mL (0.0569 L)
The amount of hydronium ions in tomato juice is 0.0001. What is the pH of the juice?
pH = 4
a. Balance the following chemical equation:
MoS2(S) + O2(g) -> MoO3(s) + SO2(g)
b. What amount (in moles) of sulfur dioxide will be produced if 227.85 mol of oxygen are used in the process?
a. 2,7,2,4
b. 130.20 mol
Using the solubility guidelines, which of the following are solid products:
(NH4)3PO4, AgBr, NH4F, MgCO3, Ca(NO3)2?
AgBr, MgCO3
Fe3O4 + 4 CO--->3 Fe + 4 CO2
How many moles of CO are needed to react with
16.5 g of Fe3O4?
0.285 moles CO
225 mL of a 1.45 mol/L solution of sodium iodide is added to 175 mL of a 0.85 mol/L solution of lead(II) nitrate.
a. Write the net ionic equation for the reaction.
b. How many grams of solid precipitate will form in the process?
c. Does the resulting solution still contain Na+ ions or I- ions?
a) Pb+2(aq) + 2I-1(aq) -> PbI2(s)
b) 66.27 g
c) Since the iodide ions were in excess, there will still be iodide ions in solution.
What is the purpose of titration?
Titration is the slow addition of one solution of a known concentration (called a titrant) to a known volume of another solution of unknown concentration until the reaction reaches neutralization. Then the unknown concentration can be calculated.
How many atoms of hydrogen (in water) are produced if 2 grams of liquid methane are completely burned (combustion)?
3 X 1023 atoms of hydrogen
Which of the following will occur:
a) NaCl + AgNO3 -->
b) HClO3 + KOH --->
c) NH4ClO3 + K2O -->
d) Na2CO3 + AgClO3 -->
a, b, d
How many litres of carbon dioxide gas is produced if 2L of carbonic acid decomposes at STP? How particles is in the CO2 produced?
V =2L of CO2
N = 5.36x1022 particles of CO2
A 15.67 g sample of a hydrate of magnesium carbonate was heated, without decomposing the carbonate, to drive off the water. The mass was reduced to 7.58 g. What is the name and formula of the hydrate?
Magnesium carbonate pentahydrate
MgCO3 · 5H2O
What volume of 0.55 mol/L sodium hydroxide is needed to neutralize 100 mL of a 6.50 mol/L phosphoric acid solution?
3.55 L
When potassium hydroxide reacts with phosphoric acid, potassium phosphate and water form. Suppose 6.26 mol of potassium hydroxide are reacted with 2.36 mol of phosphoric acid. What is the limiting reagent? What mass of water will form?
KOH
112.81 g