| 1. |
Professor Floop inspected the glassware in the storeroom once a month. There were 1750 pieces of glassware at the beginning of the semester. The first month he found two items that were cracked. The second month he found two. The third month he found five. After his fourth and final inspection of the semester he calculated that on average there were 4.5 pieces damaged per month. How many damaged pieces must he have found during the last inspection?
|
|
| 2. |
Alyssa measured the pH in a flask of acidic solution several times. She was slowly adding more acid trying to reach a stable pH of 5.5. Every time she would add a few drops of acid, the pH would drop. A few minutes after she added drops of acid the pH would start to rise. So she kept this up and finally read the pH four times over a period of five minutes without adding more acid. The four pH measurements were 5.42, 5.36, 5.43, and 5.42. What is the range of her measurements?
|
|
| 3. |
Suppose your grade for the chemistry unit is based upon two tests (each worth 30% of your total grade), three homework assignments (each worth 10% of your total grade) and one lab report (worth 10% of your total grade). If your test scores were 75 and 83, and the homework scores were 92, 88, and 86, what score must you receive on your lab report to insure a final chemistry unit grade of at least 85?
|
|
| 4. |
Mr. Bloop was separating three organic liquids by distillation. He put 100 ml of a mixture into a distillation flask and set about heating it up. He began flowing water through the condenser and watched as the temperature rose. The temperature stopped rising and was stable at 89 C for 5 minutes 13 seconds and the mixture boiled. Then it slowly rose to 96C and stabilized for 10 minutes and 50 seconds where it boiled for awhile and then it rose again to 99C and stayed there for 5 minutes. He stopped the process. What was the average time (in minutes and seconds) that the liquid was stable at a boiling point?
|
|
| 5. |
* This is a pre-made sheet.
Use the link at the top of the page for a printable page. |
|
| 6. |
David performed a reaction that resulted in the precipitation of 5 g of silver chloride in a beaker. Hailey and Jessica performed the same reaction and got 5.5 g and 5.5 g, respectively. The instructor told them that the most silver chloride he had seen produced in the reaction was 6.4 g. Find the average of the three students' results and compare it (as a percent) to the maximum amount seen by the teacher.
|
|
