Unit 6: The Mole
How many atoms are in 1 mol of a substance?
6.02 x 1023 atoms
What coefficient goes in front of Fe in this chemical equation to be correctly balanced?
____ Fe + ____ O2 --> ____ Fe2O3
4
This measures the concentration of a solution defined as the number of moles of solute per liter of solution
Molarity
This gas law is the only one that has an inverse relationship.
Boyle's Law
A process that absorbs heat is what type of reaction?
Endothermic
What is the molar mass of AuCl3?
303.6 g
Classify the following chemical reactions:
2 Ag + Cl2 --> 2 AgCl
Synthesis or Combination
Is the following compound an electrolyte?
NH3
No, covalent compounds are not electrolytes
What two variables are involved with Charles' Law?
Temperature and Volume
How much water at 100°C could be vaporized by the addition of 120 kJ of heat? (Hvap = 40.7 kJ/mol)
2.9 g
What is the empirical formula for C12H36
CH3
Predict the products given the following reactants:
Zn + CuSO4 -->
ZnSO4 + Cu
What ion do acids produce in water?
H+
What happens to the pressure of a gas inside a container if the temperature of the gas decreases?
Pressure also decreases
The least penetrating form of radiation is ____.
alpha
What is the number of moles of beryllium atoms in 36 g of Be?
4.0 mol
In the reaction below, what is the ratio of moles of sodium (Na) used to moles of hydrogen (H2) produced?
2 Na + 2 H2O --> 2 NaOH + H2
2:1
What is the pOH of a 1.0 x 10-3 HCl solution?
11
A breathing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. What is the partial pressure of oxygen at a total pressure of 101.4 kPa if PHe = 82.5 kPa and PCO2= 0.4 kPa?
18.5 kpa
What particle does argon-39 (atomic number 18) emit when it decays to potassium-39 (atomic number 19)?
Beta
How many liters of ammonia (NH3) are needed to produce a 10.0 gram sample?
13.2 L
Use the following equation to answer the question:
Mg3N2 + 6H2O --> 3 Mg(OH)2 + 2 NH3
You find that when you have 3.00 grams of Mg3N2 you produce 1.33 L of NH3 and when it reacts with 5.00 grams of H2O you produce 2.07 L of NH3. What is your limiting reactant?
Mg3N2
(aq)
When the Kelvin temperature of an enclosed gas doubles, the particles of the gas
move faster
In 8.00 hours, a 100 g sample of a radioactive element decays to 25.0 grams. What is the half-life, in hours, of this isotope?
4 hours