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Chemical Reactions

Investigation 3 – PostLab

 

 

 

 

 

 

 

ANALYZE IT

When you have finished your Investigation, focus on the data your group collected in Table B.

For each Trial, convert the reaction time as it is recorded in Table B from minutes and seconds to seconds. The reaction times in seconds should be entered in the last column of Table B.

Based on the data in Table B, discuss the questions in problems 3-8 of the Analysis section in your Student Data Record. You should refer to the equation below in your Student Data Record.

CHEM 3 Post Equation

  • Which reactant was added using a different volume for each reaction? 
  • Did the volume of that reactant increase or decrease for reactions 1 to 6? 
  • Which chemical was the other reactant in the reaction? 
  • Was the other reactant added using a different volume for each reaction? 
  • Which chemical was the catalyst in the reaction? 
  • Was the catalyst added using a different volume for each reaction?

Based on the data in Table B, discuss the questions in problems 9-12 in your Student Data Record. 

  • Reaction time was measured by following the disappearance of which reactant?
  • What evidence supports the idea that the iodine (I2) was consumed in the reaction? 

  • How was the disappearance of the iodine (I2) measured? 

  • What was the purpose of this Investigation? 

Next, graph your data from Table B.

Note: You should connect the data points with a series of straight lines and not draw a best fit line. If necessary, refer to the procedure for the Graphing of Independent and Dependent Variables in your Procedural Toolbox.

 

Based on your graph of the data, discuss the questions in problems 14-17 about the change in reaction time.

  • Why was the graph created using the different volumes of acetone and the reaction time? 
  • Did the reaction time for Trials 1 to 6 increase or decrease? 
  • Which reactant caused the reaction time to change? 
  • How would you describe the relationship between the amount of the acetone reactant and the reaction time? 

Discuss your answers to the questions in problems 18 and 19 in your Student Data Record. 

  • As the products were made what happened to the iodine? 
  • What happened to the products as the amount of the reactant, acetone, was increased? 

Based on the data collected in the Investigation, answer the following questions, and compare your conclusions with your predicted answers.

  • Do chemical reactions always produce products at the same rate? 
  • What factors affect how fast a chemical reaction takes place? 
  • If you change the amount of a reactant, what happens to the time it takes to complete a chemical reaction? 

GET FOCUSED

Complete the Focus Question in your SDR then discuss it as a class. 

  • In a chemical reaction, what is the relationship among the reactants, the products, and the time it takes to complete the reaction? 

COMPREHENSION CHECK

The Comprehension Check is designed to summarize the Chemical Reactions CELL.

If time permits, answer each Focus Question below.  

  • In a chemical reaction, what is the relationship between the amount of reactants and the amount of products? 
  • In a chemical reaction, do the amounts of the reactants affect the amounts of products produced? 
  • How does the Law of Conservation of Matter relate to chemical reactions?
  • In a chemical reaction, what is the relationship among the reactants, the products, and the time to complete the reaction?