Problem Solving in Chemistry

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Presentation transcript:

Problem Solving in Chemistry Chapter 3 Extension

What do I do now? Technique Analyze Calculate Evaluate list knowns, unknowns apply conversions Calculate solve by addressing the units – don’t memorize the technique! unknown label should be only remaining Evaluate does it make sense?

What do I do now? Examples What is the mass, in grams, of a piece of lead that has a volume of 19.84 cm3? (density of lead = 11.4 g/cm3)

What do I do now? Examples What is the volume, in cubic centimeters, of a sample of cough syrup that has a mass of 50.0 g? (density of syrup = .950 g/cm3)

Conversion factors – using common conversions (1 kg = 1000 g) Example #1 If 2 teaspoons of chili powder are needed to make a 10 serving chili recipe, how many teaspoons should be added to serve a crowd of 600?

Example #2 How many cups are in this number of teaspoons of chili powder? (3 tsp = 1 tblspn, 16 tblspn = 1 cup)

Example #3 How many students can obtain a wire sample of copper if each student needs 1.84 grams and the spool has a mass of 50.0 grams?

Example #4 Express 750 dg in grams.

Example #5 What is the volume of a pure silver coin that has a mass of 14 grams? (density of Ag = 10.5 g/cm3)

Example #6 What is .073 cm in micrometers?

Example #7 How many seconds are in one day?

Dimensional analysis – using conversion units (dimensions) to arrive at an answer Use the factor-label technique! Avoid “chicken-scratch” math! Your labels will bring you through the process to your answer

Dimensional Analysis - Examples “Firkins” worksheet!

More complex problems If you are traveling at a rate of 40 km/hr, how many meters have you gone in 30 seconds?

Dimensional Analysis - Examples The density of manganese is 7.21 g/cm3. What is the density of Mn in kg/m3?

More complex problems If the sun is 150 million km from earth, how many hours does it take for its light to reach us? Speed of light = 3.00 X 108 m/sec

More complex problems Express 2.5 g/cm3 in kg/dm3