# The if then statement you wrote if iron is higher

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What was your hypothesis? (the “if-then” statement you wrote) If iron is higher than copper in the chemical activity series, then it will replace copper in its compound making it a mole ratio of 3:2. 2. Was your hypothesis supported or rejected by the data? It was supported because the mole ratio of copper to iron was 3:2. Here you will provide evidence to support your hypothesis. a. What evidence do you have to that a chemical reaction occurred? There was copper dust at the bottom of the beaker and the mass of the iron nails decreased.

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b. How do you know iron was used in the reaction? The mass in the iron nail went down to 3.6-2.8. c. How do you know copper was produced in the reaction? The color of the chemical changed. How did you experimentally determine the mole ratio of iron: copper? 0.0212 mols Cu =1.5 x 2 : 0.014 mols Fe =1 x 2 = 3: 2 0.014 0.014 d. What was your experimental mole ratio? Copper to Iron = 3:2 e. How did you use it to determine the correct balanced chemical equation? 2Fe + 2CuCl 2 ------->3Cu + 2FeCl =2:3 f. Copper could be lost in this experiment during the washing and decanting steps. How would this affect the iron: copper mole ratio (too high or too low). It does not affect it. g. Explain Because the iron and copper had already combined so washing off the copper dust wouldn’t affect it. h. If your solid product was not completely dry when you took the mass at the end of the experiment, would your iron: copper mole ratio be too high or toO low? It would be too high. i. Explain. Because more mass will add to the weight of the iron nail. 4. What did you learn from doing this experiment? I learned iron can replace copper in its compound because it is more reactive. 5. Explain or provide an example of your new learning or understanding. The dust that was formed is proof that copper was removed from its compound when the reaction
happened. REFERENCES Lab 7-2 Report: Quantitative Analysis (pp. 2-3,)
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• Fall '13
• Mole, Stoichiometry, Chemical reaction, International System of Units, Molecule, Avogadro constant

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