IMF’S
What are the 4 types of intermolecular forces?
London Dispersion, dipole-dipole forces, hydrogaen bonds, and ion-dipole forces.
Thermochemistry is the study of what?
The study of heat changes that occur during chemical and physical changes.
What’s the difference between a heterogeneous mixture and a homogenous mixture?
Heterogenous not a definite or uniform composition. Homogenous is uniform composition.
True or False: temperature is always calculate in kelvin.
True
Whats a limiting reactant?
the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.
What type of intermolecular forces are due to the attraction between temporary dipoles and their induced temporary dipoles?
London Dispersion
Give 3 different examples of energy.
kinetic, potential, heat, solar, nuclear, wind, sound, magnetic (any of these are right)
What are the 2 component of a solution?
Solvent (does the dissolving), and solute (the thing being dissolved)
Why are gases easy to compress?
Because there is a lot of empty space, so it‘s easy to compress them.
How do you determine the percent composition of elements in a compound?
In dispersion forces more electrons equal what?
more attraction to neighboring nuclei and stronger dispersion forces.
What’s the difference between exothermic and endothermic?
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and energy, and cools the surroundings.
Solubility _____ with an increase in temperature
increases
What are the 4 variables to describe gases?
1. pressure (kPa,mmHg,atm)
2. volume (L or mL)
3. temperature (kelvin)
4. amount (moles)
What are the 4 steps to solving stoichiometry?
1. Write a balanced equation to represent the reaction.
2. Convert given quantities to moles.
3. Use mole ratio to find moles of unknown.
4. Convert found moles to unit needed
Intramolecular forces are those within the molecule that keep the molecule together. Intermolecular forces are the attractions between molecules, which determine many of the physical properties of a substance.
How many moles of water are produced from the following reaction, when 275 kJ of energy is given off?
4 NH3 + 3 O2 ® 2 N2 + 6 H2O ΔH = -1530 kJ
moles of solute over Liters of solution
If the temperature is constant, what change in the volume would cause the pressure of an enclosed gas to increase by a factor of 4?
1/4
2KClO3 —> 2KCl + 302
How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate?
9 moles 02
How are van der Waals forces different from Hydrogen bonds?
Much weaker, and very specific
What is the total energy required to raise the temperature of 135 g of water from 22.0°C to 133.0°C? Show work on board
ΔHfus= +6.01kJ/mol
ΔHvap= +40.7kJ/mol
cice= 2.01J/g°C
cwater= you know this already!
csteam= 2.02 J/g°C
358,000 (show work)
Determine the molarity of 125 grams of H2SO4 dissolved in 800 ml of water.
1.60 M H2SO4
What is the pressure of 0.33 moles of nitrogen gas, if its volume is 15.0 L at -25 degrees celsius?
3.08 atm
Zn + 2HCl —> ZnCl2 + H2
What volume of hydrogen at STP is produced when 2.5g of zinc react with anexcess of hydrochloric acid?
.86LH2