TipsTips adapted from about.com about.com ExamplesExamples adapted from siraze.net and 123helpme.com siraze.net 123helpme.com Prepared by Meg Hurley
Sections Title Purpose Hypothesis Materials Procedure Data Results Conclusion
Title Tips Describes the main point Brief (10 words or less) Starts with a keyword, not an article Example Effect pressure on the volume of a gas
Purpose Tips Explains the objectives or purpose of the lab. Includes the hypothesis. Can included background information. Example To determine if/how the volume of a gas is affected by pressure. You may notice a popping sensation in your ears when you change your altitude – for example when taking off or landing in a plane. This may be a result of changes of volume of ambient gas due to ambient pressure changes.
Materials Tips List everything needed to complete your experiment. Include a drawing/diagram of set-up if necessary. Example gas measuring tube rubber tubing utility clamps stick leveling bulb iron ring meter water
Procedure Tips Describe the steps you completed. Be detailed enough so anyone reading your report could duplicate your experiment and expect to get the same results. You may want to include a drawing/diagram. Example 1.Set up the apparatus as shown in the figure. 2.Read and record the room temperature and pressure (P1) 3.With the water levels in the two tubes equal measure the volume of the gas. 4.Increase the pressure on the gas in the tube by raising the leveling bulb. 5.Record the new distance (L 2) and the new volume (V2). L2 is the difference between water levels. 6.Etc. …
Data Tips Present any numerical data or calculations you recorded during the experiment in a table. This is not the place to interpret the data, just present the facts in this section. You can also use this section to record any observations you make. Example Volume (mL) Pressure (atm) P x V V1 = 5.0P1 = 2.09.8 V2 = 7.5P2 = 1.310.0 V3 = 10.0P3 = 1.010.0 V4 = 12.5P4 = 0.810.0 V5 = 15.0P5 = 0.710.5 V6 = 17.5P6 = 0.610.5 V7 = 20.0P7 = 0.510.0
Figures and Graphs Tips Label all graphs with descriptive labels. Label the axes on the graph, being sure to include units of measurement. The independent variable is on the X-axis. The dependent variable (the one you are measuring) is on the Y-axis. When referring to graphs or figures in the text of your report, the first figure is Figure 1, the second figure is Figure 2, etc. Example
Conclusion Tips Sum up the experiment Relate back to your hypothesis Example When the volume was doubled from 5.0 mL to 10.0 mL the pressure was halved from 2.0 atm to 1.0 atm. … The relationship between the pressure and volume of a confined gas is inverse. The line of the graph is curved not straight, this indicates an indirect relationship…The number of moles of the gas and the temperature are assumed to be constant in this experiment. PV=k. Pressure is inversely proportional to volume. Pressure is directly proportional to the reciprocal of volume. – From 123helpme.com123helpme.com
References "Lab Report on Boyle's Law: Pressure-Volume Relationship in Gasses." 123HelpMe.com. 26 Jun 2010. How to Write a Lab Report http://chemistry.about.com/od/chemistrylabexperiments/a/labreports.htmhttp://chemistry.about.com/od/chemistrylabexperiments/a/labreports.htm Effect of Pressure on the Volume of a Gas http://www.siraze.net/chemistry/sezennur/subjects/experiment/013.pdf http://www.siraze.net/chemistry/sezennur/subjects/experiment/013.pdf Note: Images sourced from various locations across the web – Flickr, Googleimages, etc. Each photo is hyperlinked to its source.