Chm 151 Lab 2

Math Practice Lab

Hands-On Labs, Inc.

Version 42-0176-00-02

-------------------------------------------------

Lab Report Assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.

Exercise 1: Math Practice

Data Table 1. Scientific Notation and Significant Figures.

Scientific Notation |

Standard Decimal Notation | Number in Scientific Notation |

987,000 | 9.87 x 105 |

0.000356 | 3.56 x 10-4 |

35.20 | 3.52 x 101 |

0.0055 | 5.5 x 10-3 |

| |

Number in Scientific Notation | Standard Decimal Notation |

4.0 x 104 | 40000.0 |

3.679 x 102 | 367.9 |

1.99 x 10-5 | 0.0000199 |

5 x 105 | 500000.0 |

6.02 x 1023 | 602000000000000000000000.0 |

| |

Significant Figures |

Measurement | Number of Significant Figures |

4.5 m | 2 |

0.004 L | 1 |

5 mL | 1 |

305.55 cm | 5 |

20.00 g | 4 |

400,000 lbs | 6 |

Data Table 2. Calculations.

Calculation to Perform | Answer |

| 1.3 x 105 (1.290701) |

| 9.0 x 10-5 (9.02) |

(39.0) + (42.6) + (1.39) | 83 (82.99) |

| 3.8 x 10-5 |

| 6.34 x 1021 |

| 232 |

| 2.8 x 101 meters (27.5082) |

| 0.00153 m3 |

| 10 centimeters |

Equation in Example 1, solving for e: | (A * B * F) / (C * D) = E |

Data Table 3. Unit Factor Method.

Question | Answer |

a | 136 x 101 mL (1360.9) |

b | 457 x 101 g (4571.4) |

c | 24.6 meters/second |

d | 16 shifts |

e | 1.7 x 10-3 dollars/gram (0.0017) |

f | 328 feet in 9.92 seconds |

g | Store A @ $2.1 L (2.108093971) |

h | 0.69 cc (0.6912) |

Data Table 4. Density.

Question | Answer |

a | 2.52 cm3 (2.515456) |

b | 5.69 g/cm3 |

c | Mass = 11.9 (11.853) |...