??? A
Polar liquids create what type of meniscus?
Concave meniscus
What are the 4 types of colligative properties?
1. Freezing Pt Depression
2. Boiling Pt Elevation
3. Vapor Pressure Lowering
4. Osmotic Pressure
T or F
Non-electrolytes ONLY include covalent compounds.
True!!
Non-electryotes have no ions whatsoever. This is the reason they are not able to conduct electricity. Covalent compounds have no ions, they are only molecules.
Which one is stronger?
Intramolecular forces or intermolecular forces
Intramolecular forces (within the molecule)
Which of the following is an ionic compound?
a. F2
b. N2
c. NH3
d. LiF
Which intermolecular forces are found in CHF3?
Dipole-Dipole & London Dispersion Forces
What is the standard enthalpy of F2?
Zero!!
ALL diatomic molecules have a standard enthalpy of zero. Remember this when you are calculating for the change of standard enthalpy.
T or F
Ideal solutions use a modified version of Raoult's Law.
False!
Ideal solutions follow Raoult's Law since they are IDEAL.
Non-ideal solution use the modified version since the solute and sovlent are volatile.
What type of bond does the C and O have?
a. single bond
b. double bond
c. triple bond
b. double bond
* CO has 10 ve
* Draw the lewis structure
What are the 6 different strong acids?
1. HClO4
2. H2SO4
3. HI
4. HNO3
5. HBr
6. HCl
What is the first step for the formation of a liquid solution?
1st step - separate the solute into its individual components
The larger the bond order, the ________ the bond strength.
Stronger
* It requires more energy to break bonds with a bigger bond order
What is viscosity?
The liquid's resistance to flow
Tell me the individual components of the following formula:
q=mCsp^T
* Pretend the ^ is a triangle
q= energy (heat) by the reaction
m= mass of solution
Csp= specific heat capacity (4.8 J/C g)
^T = change in temperature (final - initial)
What causes phase changes?
Ex. Solid to liquid to gas (vice versa)
What does a calorimetry measure?
It measures the heat associated with chemical reactions.
Which of the following will have the lowest vapor pressure?
a. CH3CH2OH
b. CH3COCH3
c. CH3CH2CH3
d. CH3CH2CH2CH3
(due to the hydrogen bond; all of the others have london dispersion only & b does not have a hydrogen bond)
In the following scenario, what is the system and what are the surroundings. What type of reaction is occurring- exothermic or endothermic?
"Cracking an egg in the middle of the street on a day where it is 98F."
System = egg
Surrounging = hot street & hot air
Endothermic (heat went into the egg to cook it)
T or F
Colligative properties depend on the identity of the solute, not the concentration of the solution.
False!!
Rememeber the formulas to calculate colligative properties use concentration.
Calculate the standard enthalpy of the reaction for
2CO (g) + O2 (g) -> 2CO2 (g)
- 567 KJ/mol