Chapter 1
How many oxygen atoms are in Al(NO3)3 ∙ 5H2O?
14 atoms
Which experiment determined the charge of an electron?
a. Aston’s positive ray experiment
b. Millikan’s oil drop experiment
c. Thomson’s cathode ray experiment
d. Rutherford’s gold foil experiment
b. Millikan's oil drop experiment
What is the molar mass of glucose (C6H12O6)?
180.156 g/mol
Which are the following compounds are insoluble in water? There may be more than 1 answer.
a. Ca(NO3)2
b. Ca(OH)2
c. CaSO4
c. CaSO4
How many grams of calcium chloride are needed to make 250 mL of a 0.15 M solution?
4.2g of calcium chloride
Name two chemical and two physical changes
Chemical Changes:
- Combustion, rotting, rusting, digestion, cooking
Physical Changes:
- Melting, shredding, boiling, chopping, stretching
What is the charge, number of protons, number of electrons, and number of neutrons for the following ion if the mass number is 108:
Ag+
Charge: 1+
Protons: 47
Electrons: 46
Neutrons: 61
A common drying agent of organic molecules has the empirical formula P2O5. Its mass spectrum shows an M+ peak at 283.89, which molecular formula is correct?
a. P2O5
b. P4O10
c. P5O6
d. P6H15
P4O10
What is the mass percentage of oxygen in magnesium carbonate trihydrate? The molar mass of anhydrous magnesium carbonate is 84.31 g/mol.
69.38%
How many milliliters of 5.0 M CuSO4 solution should be used to make 200.0 mL of a 0.30 M CuSO4 solution?
12 mL
Which elements exist as diatomic molecules in nature?
Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, and Iodine
What is name of CH3COO-?
Acetate
How many carbon atoms are there in a 1.00 g sample of stearic acid (C18H36O2)? The molar mass of stearic acid is 284.468 g/mol.
3.81 * 1022 atoms C
Balance the following chemical equation:
C6H14(g) + O2(g) → CO2(g) + H2O(l)
2C6H14(g) + 19O2(g) → 12CO2(g) + 14H2O(l)
Which of the following solutions will have the highest conductivity? Assume the identity of the ion does not impact the conductivity.
a. 0.20 M KNO3(aq)
b. 0.20 M NaCl(aq)
c. 0.15 M MgCl2(aq)
d. 0.10 M MgSO4(aq)
c. 0.15 M MgCl2(aq)
What is the answer to this problem with the correct number of sig figs?
(0.0200)/(115.492 - 113.692)
0.0111
Identify the type of name of the following compounds:
P2O5
MgBr2
HClO3
Binary Molecular Compound: Diphosphorous Pentoxide
Binary Ionic Compound: Magnesium Bromide
Oxoacid: Chloric Acid
Consider the reaction between iron (III) oxide and carbon monoxide:
Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g)
129g of iron(III) oxide reacts with 54.3 g of carbon monoxide. What is the limiting reactant? The respective molar masses of the reactants are 159.69 g/mol and 28.01 g/mol.
Carbon monoxide (CO) is the limiting reactant
A hydrocarbon fuel is fully combusted with excess oxygen to yield 23.118 g of carbon dioxide and 4.729 g of water. Find the empirical formula for the hydrocarbon.
CH
A .05000L sample of Ca(OH)2(aq) required .04678L of 0.04498 M HCl(aq) for complete neutralization. Find the molarity of the original Ca(OH)2(aq) solution.
0.02104 M
Which of the following lengths is the shortest:
a. 1.1 cm
b. 1.1 x 103 mm
c. 1.1 x 102 µm
d. 1.1 x 10-4 km
e. 0.11 m
f. 1.1x 106 nm
c. 1.1 x 102 µm
Name/give the formula for the following compounds:
Magnesium chloride hexahydrate
CoCO3∙8H2O
Phosphorous Acid
MgCl2∙6H2O
Cobalt (II) Carbonate Octahydrate
H3PO3
Consider the following reaction between niobium and iodine:
3 Nb(s) + 4 I2(s) → Nb3I8(s)
When 25.00 grams of niobium is mixed with 95.00 grams of iodine the percent yield for the product is 82.09%. What is the limiting reactant and how many moles of Nb3I8 are actually produced in the reaction?
Niobium (Nb) is the limiting reactant
0.0736 moles of Nb3I8 are actually produced
When 2.95 g of Na2CO3 ∙ nH2O reacts with an excess of acid, 0.662 g of carbon dioxide is formed. What is the value of n? Round to the nearest whole number.
n = 5
What is the net ionic equation for the reaction that takes place when an aqueous solution of magnesium chloride is mixed with an aqueous solution of sodium hydroxide?
Mg2+ + 2OH- => Mg(OH)2