Show:
IMF’S
Thermochemistry
Solutions
Gas Laws
Moles/Stoichiometry
100

What are the 4 types of intermolecular forces?

London Dispersion, dipole-dipole forces, hydrogaen bonds, and ion-dipole forces. 

100

Thermochemistry is the study of what?

The study of heat changes that occur during chemical and physical changes. 

100

What’s the difference between a heterogeneous mixture and a homogenous mixture?

Heterogenous not a definite or uniform composition. Homogenous is uniform composition. 

100

True or False: temperature is always calculate in kelvin. 

True

100

Whats a limiting reactant?

the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.

200

What type of intermolecular forces are due to the attraction between temporary dipoles and their induced temporary dipoles?

London Dispersion

200

Give 3 different examples of energy.

kinetic, potential, heat, solar, nuclear, wind, sound, magnetic (any of these are right)

200

What are the 2 component of a solution?

Solvent (does the dissolving), and solute (the thing being dissolved)

200

Why are gases easy to compress?

Because there is a lot of empty space, so it‘s easy to compress them. 

200

How do you determine the percent composition of elements in a compound?

  1. Find the molar mass of all the elements in the compound in grams per mole.
  2. Find the molecular mass of the entire compound.
  3. Divide the component's molar mass by the entire molecular mass.
  4. You will now have a number between 0 and 1. Multiply it by 100 to get percent composition!
300

In dispersion forces more electrons equal what?

more attraction to neighboring nuclei and stronger dispersion forces. 

300

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.

300

Solubility _____ with an increase in temperature  

increases 

300

What are the 4 variables to describe gases?

1. pressure (kPa,mmHg,atm)

2. volume (L or mL)

3. temperature (kelvin)

4. amount (moles)

300

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

400
Whats the difference between an intermolecular force and an intramolecular force?

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.

400

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

= 1.08molH20
400
What is the molarity formula?

moles of solute over Liters of solution

400

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

400

2KClO3 —> 2KCl + 302

How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate?

9 moles 02

500

How are van der Waals forces different from Hydrogen bonds?

Much weaker, and very specific

500

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)

500

Determine the molarity of 125 grams of H2SO4 dissolved in 800 ml of water.

1.60 M H2SO4

500

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

500

Zn + 2HCl —> ZnCl2 + H2

What volume of hydrogen at STP is produced when 2.5g of zinc react with anexcess of hydrochloric acid?

.86LH2