Descriptive Include DV IV | Dependent And Independent Variables

Descriptive Include DV IV for Rate of Reaction of Alka Seltzer Lab  Descriptive Include DV IV

  • Descriptive Include DV IV | Dependent And Independent VariablesDescriptive Include DV IV of Alka Seltzer and water
  • What is Alka Seltzer?
  • What is produced when Alka Seltzer reacts with water?
    • Chemical Equation of the reaction
    • Discuss Carbon Dioxide
  • What is needed to increase the rate of a chemical reaction?
  • Link above information to your hypothesis

(Need to use at least one reference for this section.  Your book will count as a reference this time.)


  • Creat a list of the IV, DV, control variables (need at least 3; be specific about what is being controlled with the CV’s), and assumptions (need at least 3)
  • List materials used for Control aspect of experiment and list materials used for testing the Independent variable (ex. Acidity)


  • Separate your methods section into 2 parts: Part I and Part II. Part I will be the specific, detailed and thorough methods used for the control experiment. Part II will be the specific, detailed and thorough methods used for testing the independent variable.
  • Detailed description of the procedure your group used for the experiment. Enough information must be included so that someone else could use your list of materials and procedure and replicate the experiment exactly.
  • Don’t forget to include procedure associated with analysis (ex. Graphs and linear trendlines; include time ranges used for trendlines)
  • Must be in paragraph form, past tense, and passive voice (No “I, we, our, my” language).


You will have at least 2 data tables labeled Data Table 1:  (descriptive title), Data Table 2: (descriptive title) etc…

  • Table 1: Control experiments (just alka-seltzer in water)
  • Table 2: Your group data from your group’s experiment (how the IV changed the rate of reaction)
  • The data tables will start at 0sec and continue every 10 sec until you stopped the experiment. You will then need 4 columns of mass (Trial 1/A-S tablet 1, Trial 2, Trial 3, and Average).
  • You will need a trend paragraph for each data table

You will have 2 graphs

  • Graph of original average data from the control experiment
  • Graph of your experimental average data
  • Graphs are labeled as Figure 1: (descriptive title) and Figure 2: (descriptive title)
  • You will need a trend paragraph for each graph
  • Each graph should have 3 best fit lines on it. They need to have units included. Find the slope of the best fit lines which will represent the rate of reaction at three sections on your graph (beginning, middle, and end).  If the best fit line is plotted by hand, be sure to show your calculations directly on the graph or directly after the graph.  Please provide a key so that it is easy to determine which calculation corresponds with each line.

Descriptive Include DV IV | Dependent And Independent Variables

Discussion and Conclusion:

  • Restate the hypothesis and prediction. Does the data support or refute the hypothesis?
  • Provide evidence with quantification (ex. slope values) by discuss the rate of reaction (slope) of each condition tested. Thoroughly, discuss the rates for each different trendline of your graph.  Next, compare the rates of just water (the very first graph) to the rates of your experimental data.  Talk about each different rate on each graph. Why are they different?  What was happening to cause the difference?  This is where you make inferences!  Remember that your goal was to determine what makes the reaction rate faster. Make sure you refer to tables and figures by number.
  • Additional evidence must come from literature. Discuss reaction rates and what makes chemical reactions go faster.  Also, discuss how the independent variable you chose made your reaction rate change.  If someone in the classroom did the same type of experiment as you did (ex: acidity with HCl), you can compare reaction rates with this group.  Also, discuss the chemical reaction that occurs and what causes the mass loss.  Use literature to help you explain why.
  • Discuss possible errors. The errors must be classified as systematic or random.  Please discuss an error that actually occurred during your experiment.  What may have caused your values for rate of reaction to be different from another groups’ even though the same conditions were evaluated?  What could have been wrong with your experiment or theirs?  What caused your rates to vary between experiments (looking at raw data verses average data or between multiple trials)?  What makes your data different than what the literature says? What could you have changed to make your data better?
  • Assumptions should be discussed thoroughly. This means you need to tell the reader how the assumptions affected or did not affect the results, and why you think that.
  • Shortcomings need to be discussed as improvements that could be made to make the results better if the experiment were run again. Give specific examples!
  • Conclusion: Restate the hypothesis, whether it was supported or refuted, then support that finding with a summary of actual data.

(Need to use at least one reference in the Discussion section. More are welcome.)


  • Must use at least 2 in the paper, one in the Introduction section and one in the Discussion section.
  • One of the references may be your book, with regards to the chemical equation.
  • You may use the ACS format, similar to the termite lab report (the document in Pilot about the various ACS formats may be helpful in generating the appropriate format).