Families of Elements Lab by ltq93779

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									                         Families of Elements Lab
Background information
One of the most impressive and significant features of the periodic table is the appearance
of vertical groups of elements, which form families. Elements that are in the same family
(or group) form compounds that are similar in chemical properties. In this experiment,
four unknown solutions will be added to Silver Nitrate to create compounds. Three of the
unknowns are from the halogen family and one unknown is not. Your job is to observe
the compounds to determine which solutions are from the halogen family and which is
not.

Hypothesis
If I combine each unknown solution with Silver Nitrate then the elements in the halogen
family will…

Materials
Chemplate                   Solution B
Silver Nitrate              Solution C
Solution A                  Solution D

Procedure

   1. Using a chemplate, you will mix solutions in proportions ranging from 11:1 in
      cavity 1 to 1:11 in cavity 11. See below.




   2. Add drops of silver nitrate and solution A as directed by the diagram above.
      Record observations in the first 3 columns of Data Table 1.
   3. Rinse chemplate thoroughly and add silver nitrate and solution B in the same
      manner. Record observations in the first 3 columns of Data Table 1.
   4. Rinse chemplate thoroughly and add silver nitrate and solution C in the same
      manner. Record observations in the first 3 columns of Data Table 1.
   5. Rinse chemplate thoroughly and add silver nitrate and solution D as directed by
      the diagram. Record observations in the first 3 columns of Data Table 1.
Data

         Compound                      Description of precipitate        Which ratio produced
                                                                         the most precipitate?

Silver Nitrate and Solution A                                                       :

Silver Nitrate and Solution B                                                       :

Silver Nitrate and Solution C                                                       :

Silver Nitrate and Solution D                                                       :

Analysis Questions
  1. Which solutions appear to be in the same family? Why?

Once you have completed the lab, compile your information into a formal lab report.
All formal lab reports should have six parts in the following order:

1) Problem – should be stated in question form. Ask a question about what you want to
   find out.
2) Hypothesis – this is an educated guess. Using your prior knowledge, write a
   sentence stating what you think will happen. A hypothesis should also include a
   “If…then… because...”.
3) Materials – these are all the materials you used to complete the experiment and
   should be written as a list (not in sentences).
4) Procedures – a numbered list of the step-by-step directions someone can follow to
   repeat the experiment.
5) Results/Data –the information you obtained from doing the experiment. This
   information should not be written in sentences or paragraphs or with personal
   pronouns (I, you, we). Instead it should have numbers displayed in tables and/or
   graphs.
6) Conclusion – should be written in paragraph form. This is the section where you
   explain and interpret your results. You should, in this section, include the questions
   above AND answer questions such as: What does the data mean? Does the data
   support my hypothesis? If the data does not support my hypothesis, why? Is there
   anything I could have done to improve this experiment? Based on what I found out,
   what other questions can I ask?

								
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