1. 3.4 Dimensional Analysis In dimensional analysis you use the units (dimensions) that are part of measurements to help solve (analyze) the problem In dimensional analysis you use the units (dimensions) that are part of measurements to help solve (analyze) the problem When using conversion factors in dimensional analysis always use the conversion factor that has the unit of the known in the denominator When using conversion factors in dimensional analysis always use the conversion factor that has the unit of the known in the denominator This cancels the known unit and gives the answer in the unknown units This cancels the known unit and gives the answer in the unknown units Example page 65-66 Example page 65-66

2. 3.4 Practice

3. Step 1 – Unknown: Step 2 – Known/Given: a. mass of copper = 50.0 g b. each student uses 1.84 g Cu Step 3 – Plan a solution: Conversion Factor: 1 student 1.84 g Cu number of students

4. 3.4 Practice Step 4 – Calculation: Step 5 – Finish: 50.0 g Cu 1 x 1 student 1.84 g Cu = 50.0 students 1.84 1.84 = 27.174 students 27 Students

5. 3.4 Practice 10. A 1.0° increase on the Celsius scale is equivalent to 1.8° increase on the Fahrenheit scale. If the temperature increases 48.0°C, what is the corresponding increase on the Fahrenheit scale? 11. One of the first fillings used to fill cavities in teeth consisted of 26.0 g of Ag, 10.8 g of Sn, 2.40 g of Cu, and.800 g of Zn. Determine how many grams of silver are in 25.0g of the filling.

6. 3.4 Practice 12. Have you ever found yourself sitting through class and counting the minutes until it was over? If there is 0.200 hour remaining in class, how many seconds remain?