Project #81860 - bio 101


The experiment


                Your team will be testing different conditions for dissolving Alka-seltzer tablets (the tablets will be pre-cut into quarters).  You will determine which condition the tablet will dissolve the fastest.  Limit the number of different conditions to 2 different conditions plus your control group (in other words, no more than 2 different conditions).  The control group is the condition that you will use as a basis for comparison of the other conditions.  Room temperature tap water would be a good example of a control group for this type of experiment.  Example conditions you may choose to use: cold water, hot water, salt water (already prepared), acidic solution, basic solution (already prepared), sugar water (already prepared), carbonated soda, or soda water.  The different solutions will be made available to you and will be located on the side counter.  You will only use the solutions made available to you.  You will also need to consider what factors you want to be kept constant (constants that remain the same for each condition, the standardized variables).  When designing your experiment be sure to do repeat trials (repeat of experiment, a minimum of 3 trials) and make sure you have enough materials to perform the repeat trials.


                You may use the flow chart provided to help organize your experiment, but you do not need to turn this in.  You should use the template for the lab write-up as a guide.  Failure to follow this template will result in a poor grade.  A guide for how the write-up will be graded is provided (“grading rubric”).  Make every attempt to earn all the possible points by reading this before, during and after you have written your write up.


































Planning Flow Chart






Lab Write-up Template


The write-up should be typed and single spaced in a word document.  See grading rubric for clarity on formatting.


Identify the different sections of the write-up with headings.


The first heading should be Introduction


* What question are you trying to answer?


* State your hypothesis (possible explanation/prediction for the problem/question you are asking).


* Make sure this possible explanation/prediction is a complete sentence and not a question.


* Make sure the statement is testable.   In other words, can you perform an experiment that will either support or reject your prediction.  If you cannot not think of a way to test your prediction, then it is not testable.


Next heading should be Materials.


* Make a list (this does not need to be in paragraph form) of ALL items used in the experiment and their quantities. 


*In this section, identify the dependent and independent variables, constants (standardized variable) and your control group and experimental groups (you will lose points if you do not identify ALL dependent and independent variables, constants and control and experimental groups).


*Be sure to be very clear regarding your materials used, for instance, if you list room temperature water, what was the temperature of the “room temperature” water (keep in mind that not all rooms are the same temperature and the goal is to describe the materials in such a way so that anyone could repeat your experiment exactly). 


*Be sure to include the concentrations of the prepared solutions used if applicable (for example, what was the concentration of the sugar water?)


Next heading should be Procedure:


* Your procedure should be written so that anyone else could repeat the experiment.  For instance, if you used hot water, what temperature was it; if you chose salt water, what was the concentration of the salt water, etc.  That means that even some of the most obvious steps need to be stated so there is no uncertainty, even if you already described it in the materials.


* When designing the procedure, be sure to include replicating the experiment (trials) to ensure data is reproducible and valid. 


Next heading should be Results:


* This section includes BOTH a data table with the raw data and a graph to illustrate the results of you experiment.  Be sure to include calculated averages of trials in the data table.


* All tables, graphs and charts should be labeled appropriately (a title, labels for both x & y axis, legend etc.) so the reader will be able to understand the information presented. 


Next heading should be Conclusions:


*This should be in paragraph form (complete sentences and proper grammar!).


*You will restate your hypothesis and whether you accept or reject your hypothesis.


* In this section, EXPLAIN why you accepted or rejected your hypothesis using data from the experiment (Include a brief summary of the data - averages, highest, lowest, etc., to help the reader understand your results and why you have come to particular conclusions). 


* Discuss your thoughts about the possible reasons for your results (for example, if you chose salt water as a variable, give a possible reason why salt water, in particular, may have generated your results). 

*Discuss possible errors that could have occurred in the collection of the data (experimental errors) and describe how these errors may have impacted the data

Subject Science
Due By (Pacific Time) 10/10/2015 12:00 am
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