Intermolecular Forces
Which element is the most electronegative?
Fluorine
What type of reaction is this:
2Na + Cl2 --> 2NaCl
Synthesis reaction
What does temperature measure?
Average kinetic energy
A glass of Kool-Aid contains 250g of water and 15g of Kool-Aid powder. Which substance is the solute?
Kool-Aid powder
State the ideal gas law and define what each of the letters mean.
PV=nRT
(pressure)(volume) = (moles)(gas constant)(temperature)
A bond is considered polar if the difference between the atoms' electronegativities is greater than...
0.4
How many reactants are there in a decomposition reaction?
Only one reactant
Why does it take much more energy to heat up water than a metal pot?
Water has a higher specific heat capacity than metal
What is the molarity of a solution containing 1 mole of NaCl in 2 Liters of solution?
0.5 M
What is the relationship between pressure and temperature?
Direct
greater temperature = greater pressure
Is the following bond polar or nonpolar?
C-H
Nonpolar
Difference between EN values is only 0.4
How many moles of ZnCl2 can be produced by 1.5 moles of Zn?
Zn + CuCl2 --> Cu + ZnCl2
1.5 moles of ZnCl2
In an endothermic reaction, products have ____ energy than reactants, making the reaction feel cold.
higher
What is the molarity of a solution containing 1 gram of NaCl in 2 Liters of solution?
The molar mass of NaCl is 58.44 g/mol
0.00856 M
(will accept 0.009 or other similarly rounded answer)
Under what conditions do gases behave most "ideally?"
low pressure, high volume, low molar mass, and high temperature
What is the strongest intermolecular force the following molecule can form?
H2O
Hydrogen bonding
3 mins. team discussion
What are the coefficients when the following chemical equation is balanced?
__Ca(OH)2 + __H3PO4 --> __Ca3(PO4)2 + __H2O
3Ca(OH)2 + 2H3PO4 --> Ca3(PO4)2 + 6H2O
(3, 2, 1, 6)
How much heat is needed to fully boil 100.0 g of water at its boiling point? INCLUDE UNITS
(Hvap=40.8 kJ/mol, molar mass=18.015 g/mol)
226 kJ
3 min. discussion
What volume of 12M HCl would be needed to produce 25 mL of 8.0M HCl?
0.017 L or 17 mL
What is the temperature of 6.01 moles of a gas at 1.43 atm and 22.81 L?
66.106 K
3 mins. team discussion
What is the strongest intermolecular force the following molecule can form?
CHF3
Hint: Draw a lewis structure first!
Dipole-dipole forces
How many grams of H2O are produced by burning 1.0 moles of CH4?
CH4 + 2O2 --> CO2 + 2H2O
Molar masses: CH4 = 16.04 g/mol, H2O = 18.02 g/mol
36.04 g H2O
How much heat is required to warm 100.0 g of water (Cp=4.18 J/goC) up from 1oC to 26oC?
10,450 J
q=mCdT, q=(100 g)(4.18 J/goC)(25oC)
3 min. discussion
Which acid would DECREASE the pH of a solution more, and WHY?
2M HCl (strong) or 2M CH3COOH (weak)
HCl
This substance is a strong acid, meaning it adds more H+ to the solution. The more H+ in solution, the lower the pH.
How many grams of O2 gas are contained in a 2.41 L vessel at 0.985 atm and 273 K?
3.39 g O2 (0.106 moles)