Classify AIR as a heterogeneous mixture, homogeneous mixture, pure element, or pure compound:
What is homogeneous mixture
100
If 5750 joules of energy are added to 455 grams of granite at 24.00 C, what is the final temperature of the granite? Cs of granite is 0.79 J/g oC.
What is 40.0 oC
100
Calculate the energy of a photon of radiation with a wavelength of 6.4 x 10-7 m.
What is 3.1 x 10-19 Joules
100
A 12 oz. can of soda weighs about 450 grams. How many joules are released when a can of soda is cooled from 25 degrees Celsius (room temperature) to 4 degrees Celsius (the temperature of a refrigerator). The heat capacity of liquid water is 4.18 J / gram x oC.
What is 40. kJ
200
Traveling at 65 miles/hour, how many feet can you travel in 22 minutes?
What is 125,840 ft.
200
A 600mL balloon is filled with helium at 700mmHg barometric pressure. The balloon is released and climbs to an altitude where the barometric pressure is 400mm Hg. What will the volume of the balloon be if, during the ascent, the temperature drops from 24 to 5°C?
What is 983 mL or .983 L
200
Which noble gas has the highest first ionization energy?
What is Helium
200
How many joules are required to heat 75 grams of water from -85 ˚C to 185˚C?
Heat of Vap.=2260 J/g
Heat of Fusion=334 J/g
C of Ice=2.05 J/g˚C
C of Steam=2.02 J/g˚C
What is 251.845 kJ
300
Determine the name of this compound: CoBr2
What is Cobalt (II) Bromide
300
A sample of hydrogen effuses through a porous container 7.50 times faster than an unknown gas.
What is the molecular mass of this unknown gas?
What is 114 g/mol
300
Determine the molecular geometry and polarity of Phosphorous Trichloride.
What is Trigonal Pyramidal and polar
300
Define critical point
What is The temperature above which a substance will always be a gas regardless of the pressure
400
Given the following reaction:
C3H8 + O2 -------> CO2 + H2O
a) If you start with 14.8 g of C3H8 and 3.44 g of O2, determine the limiting reagent
b) determine the number of moles of carbon dioxide produced
Balanced equation:
C3H8 + 5 O2 -------> 3 CO2 + 4 H2O
a) O2
b) 0.065 mol CO2
400
Consider the following equilibrium:
2 NO2(g) ⇄ N2O4(g)
If 2.00 moles of NO2 are placed in a 1.00 L flask and allowed to react, at equilibrium 1.80 moles NO2 are present. Calculate the Keq.
What is Keq = 0.031
400
When determining the most abundant resonance structure for a molecule, what qualities do you look for?
What is structures that minimize the total number of formal charges and if there are formal charges, you want them on the most electronegative atoms.
400
Sodium has a density of 0.968 g/cm3 and a unit cell side length (a) of 4.29 Å
a. How many sodium atoms are in 1 cm3?
b. How many unit cells are in 1 cm3?
c. How many sodium atoms are there per unit cell?
a. 2.54 x 1022 atoms in 1 cm3
b. 1.27 x 1022 unit cells
c. 2 atoms per unit cell
500
If it takes 54 mL of 0.1 M NaOH to neutralize 125 mL of an HCl solution, what is the concentration of the HCl?
What is 0.043 M HCl
500
When the volume of the following mixture of gases is increased, what will be the effect on the equilibrium position?
4HCl(g) + O2(g) ↔ 2H2O(g) + 2Cl2(g)
What is Shifts left to increase the number of gas molecules.
500
Give the molecular geometry, polarity, and hybridization for Xenon Tetrafluoride.
What is square planar, non-polar, and sp3d2
500
What is the repeating unit of a polymer called? What are the two reaction types this undergoes during polymerization?