What you will need to do: 1. Create a flow chart for the separation of your unknown mixture – BERFORE doing lab 2. Create data table – BEFORE doing lab 3. Do lab 4. Analyze data – calculate percent composition of your unknown mixture = 15 points = 30% 5. Write a complete lab report = 35 points = 70%

1. A flow chart is often used to illustrate the steps involved in the separation of a mixture. Flow charts are constructed BEFORE attempting to separate the mixture. Think of it as roadmap you intend to follow to get to the final products. The flow chart is included in the Methods section of the lab report.

EXAMPLE OF A FLOWCHART for Separation of a Mixture

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Methods Section - with flowchart * step-by-step * numbered 6. Results Section * data tables * graphs, charts 7. Discussion Section

Name: Terry Testtube | Due Date: 8/27/1999 | Lab Partners: Excellent helper #1 | Excellent helper #2 | |

SAMPLE LAB REPORT

Effect of Gravity on Rate of Fall

Introduction:

During this laboratory exercise we attempted to show that the force of gravity has the same effect on all falling bodies near the earth. We intended to show this by dropping several objects in normal atmospheric conditions, and in a vacuum chamber. Our tests showed that while everyday experience may indicate that not all objects fall toward the earth at the same rate, they are submitted to the same force of gravity. Materials:

Feather

Coin

Stopwatch

Meter stick

Vacuum chamber

Vacuum pump

Magnet

The vacuum chamber must have some special mechanism so that the fall of any object placed inside of it can be controlled and measured. Our vacuum chamber had an internal trapdoor that could be opened by waving a magnet nearby. Methods: 1. Drop a feather and a coin in the open air, three times from a height of 2.5m 2. Time their decent using a stopwatch – record this time in Data Table

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Example: a=2∆x/(∆t2) a=(2(2.5m))/((2.36s)2)=0.89m/s2

These calculations have been completed for all drops and are given in the table below.

Calculation Table 2: | Open-air drop | In chamber (gas-filled) | In chamber (evacuated) | Feather (1.23g) | 0.89m/s2 | 0.88m/s2 | 9.8m/s2 | Coin (2.78g) | 9.8m/s2 | 9.8m/s2 | 9.8m/s2 |

Discussion:

The findings of the experiment seem to be quite conclusive and clearly let us meet our objective. We intended to show that gravity applies an equal force on all falling bodies. To do this, we evaluated the trials to find the observed acceleration of the dropped items. When you look at the acceleration for the falling coin it is nearly the same in all three situations, and very close to the accepted quantity for acceleration due to