Here are some mini lectures of problems similar to those done in class.
Read the problem, then click on the link to watch the solution. These lectures are performed in Windows Media Player and in Quick Time, so choose the format that works for you. Make sure you watch on full screen. There is accompanying sound. If the computer you are working on has no speakers you can use headphones. Bring your own Walkman type headphones if you are using the Cerritos College computers. Some of the problems are done in more than one part due to disk space.
Unit 1
How many cg in 451.5 Kg?
Windows Media Player Quick Time Transcript
How many kilometers are in 3.4 x 10 13 millimeters
Solution in PowerPoint Transcript
A rock has a density of 3.68 g/cm3. What is the volume of the rock if it has a mass of 22 lbs?
Windows Media Player QuickTime Format Transcript
How many cubic millimeters are in 8.24 decimeters?
Windows Media Player QuickTime Format Transcript
The estimated amount of recoverable oil from the field at Prudhoe Bay in Alaska is 9.6 X 10 9 barrels. What is the amount of oil in cubic meters?
(1 barrel= 42 gallons exactly) (1 qt = 9.46 x 10 -4 m3)
Part 1 Flash Part 2 Flash Part 1 Quick Time Part 2 Quick Time Transcript
How many kilometers are in 3.46 x 10 13 mm
Flash Quick Time Transcript
How many milliliters are in 1.2 x 10 6 dl
Flash Quick Time Transcript
How many milligrams are in 32 lbs?
Flash Quick Time Transcript
How many kilometers are in a 100.0 yd football field?
Flash Quick Time Transcript
What is 2.00 drams in gallons if: 1 dram = 3.6967 x 10 -3 microliters?
Flash Quick Time Transcript
If gas is 66 cents per L what is the price in dollars per gallon?
Solution Flash Quick Time Solution in PowerPoint Transcript
If a glass holds 4.600 x 10 4 mm 3 of water, what is this in cubic inches?
Flash Quick Time Transcript
Unit 2
Aspirin has the formula C9H7O4 (Molar Mass = 179.15 g). How many grams of hydrogen would be contained in a sample of aspirin that has 5.28 X 10 22 atoms of carbon?
Windows Media Player QuickTime Transcript
How many molecules of aspirin (C9H7O4 Molar Mass = 179.15 g) contain 45.26 g of oxygen?
Windows Media Player QuickTime Transcript
How many TNT molecules (C7H5O6N3) contain 35.0 g of nitrogen
Solution Transcript
How many grams of hydrogen are bonded to 22.0 grams of oxygen in water (H2O)?
Solution Transcript
How many grams of oxygen are in 50.0 g of TNT (C7H5O6N3)? The molar mass of TNT is 227 g.
Solution Transcript
How many moles of Fe are in 33.0 grams of Fe?
Solution pt. 1 Solution pt. 2 Transcript
How many K atoms are in 3.0 grams of K3P?
Solution Transcript
A 11.17 g sample of metal is reacted with excess oxygen to produce 14.18 g of the oxide MO2. What is the molar mass of element M.
Pt. 1 Windows Media Pt. 1Quick Time Transcript
Pt. 2 Windows Media Pt. 2Quick Time Transcript
Draw the electron dot structure for the nitrate ion NO3-
Pt. 2 Windows Media Pt.2 Quick Time
Pt. 3 Windows Media Pt. 3 Quick Time
How many atoms of O are in 32 kg of Phosphoric acid?
What is the percent composition of glucose, C6H12O6?
A 2.00g sample of lithium metal is burned in oxygen atmosphere to produce 4.31 g of a lithium-oxygen compound. Determine the compound’s empirical formula.
Pt. 1 Windows Media Pt. 1Quick Time
Pt. 2 Windows Media Pt. 2Quick Time
Pt. 3 Windows Media Pt. 3Quick Time
A 3.750 g sample of the compound containing only C, H, and O is burned in a combustion analysis apparatus. The mass of CO2 produced is 10.05 g and the mass of H2O produced is 2.470 g. What is the empirical formula of the compound?
Pt. 1 Windows Media Pt. 1Quick Time
Pt. 2 Windows Media Pt. 2Quick Time
Pt. 3 Windows Media Pt. 3Quick Time
Pt. 4 Windows Media Pt. 4Quick Time
A compound has the formula BxH20O3. It contains 36.14 % by mass oxygen. What is X?
Solution Pt. 1 Solution Pt. 2 Solution Pt. 3 Solution Pt. 4 Solution Pt. 5
Transcript pt. 1 Transcript pt. 2 Transcript pt. 3 Transcript pt.4 Transcript pt. 5
The percent of aluminum in the compound Al2X3 is 18.56%. What is the molar mass of the element represented by X?
Unit 3
What volume of a .500 M solution of NaCl (molar mass 58.45 g) would contain 35.21 g of the solute?
How many grams of sucrose (molar mass 342.22 g) would be needed to prepare 1505 ml of a 2.4 M solution?
What is the molarity of a 1.45 m sucrose (molar mass 342.22 g) solution that has a density of 1.10 g/ml?
Pt 1 WMP Pt 2 WMP Pt 3 WMP Pt 4 WMP
Unit 4
Complete and balance the following equation:
Complete and balance the following equation:
Complete and balance the following equation: Solid magnesium oxide is heated
Net Ionic Equations
Write the molecular, total and net ionic equations for the following reaction: Aqueous sodium oxalate is added to hydrochloric acid.
Molecular equation WMP Total ionic equationWMP Net ionic equation WMP
Molecular equation QT Total ionic equation QT Net ionic equation QT
Write the molecular, total and net ionic equations for the following reaction: aqueous solutions of copper (I) chloride and sodium nitrate are mixed.
Molecular and Total ionic equations WMP Net ionic equation WMP
Molecular and Total ionic equations QT Net ionic equation QT
Write the molecular, total and net ionic equations for the following reaction: aqueous solutions of sodium hydroxide and zinc nitrate are mixed.
Molecular equation WMP Total ionic equation WMP Net ionic equationWMP
Molecular equation QT Total ionic equation QT Net ionic equation QT
How many grams of precipitate are formed when 25 g of potassium hydroxide (molar mass 56.11) are added to 250.0 ml of 1.50 M CuSO4(molar mass 159.6)?
Unit 5
A 2.45 g peanut is burned under a beaker containing 125 ml of water. The initial temperature of the water is 21.5 oC. The final mass of the peanut is .08 g and the final temperature of the water is 76.9 oC. How much heat did the water absorb?
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