I need help with Chemical Reactions Lab.

Obyg0612
timer Asked: Nov 19th, 2017

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Please help me answer questions on the back side.

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uaa LAB: CHEMICAL REACTIONS The changes that occur during a chemical reaction are represented by a chemical equation. An equation uses symbols to represent these changes. The reactants are the chemicals before the reaction begins, the products are the results of the reaction. 2Na(s) + Cl2(g) → 2NaCl reactants products Purpose: to identify the type of reaction occurring and to write a word equation to facilitate writing complete, balanced chemical equation MATERIALS: Part A aluminum foil bunsen burner goggles steel wool (Fe) Part B tiny beaker iron nail string copper (II) sulfate solution paper towel watch/clock tongs PROCEDURE: Part A 1. Protect the table with aluminum foil. Place the burner in the center of the foil. Steel wool 2. Observe the color of the steel wool initially. Record your observations. 3. Hold the steel wool with the tongs over the flame. As the steel wool burns, record the changes it undergoes. Part B CAUTION: sulfate solutions are poisonous; handle with care and wear goggles 1. Fill the beaker to the bottom line with copper sulfate solution. Record your observations about the nail and the solution. OD 2. Place the nail into the beaker so that a portion remains outside the solution. After 5 minutes, pull the nail out and place it on the paper towel. Record your observations about the nail and the solution. 3. Put the nail back into the solution and observe further color changes. TABLE 1 Data and Observations After Reaction is Complete During Reaction Before Reaction Reaction lights up Part A • green flame . shreded n • Silver color •The rool Shrink in size with slight lust Burnt smell · Solid, light •forming tiny ball Got darker was about to melt part B • Blue liquid No difference • Nail changed color to • Iron nail (Silver ) redish brown the No difference in solution Decomposed; part of nail was QUESTIONS AND CONCLUSIONS: in the bottom of liquid 1. What type of reaction happened in Part A? in Part B? combustion. single replacement 2. Oxygen was a reactant in the reaction in Part A. Where did the oxygen come from? 3. How many products are in any synthesis reaction? reactants? 4. Write a word equation to describe the reaction in Part A (like “hydrogen plus oxygen make water”) 5. Using the word equation as a guide, write a complete, balanced equation for the reaction in Part A. 6. Is the product of any synthesis reaction a compound or an element? Explain. 7. How many products are in a decomposition reaction? reactants? 8. Is the reactant that decomposes an element or a compound? Explain. What element 9. What element caused the copper (II) sulfate solution to change color? Explain how you reached this conclusion. caused the nail to change color? 10. Describe the “displacement” of metals that took place in Part B. 11. Write a word equation to describe the reaction in Part B. 12. Using the word equation as a guide, write a complete, balanced equation for the reaction in Part B. 13. Are the products of a single displacement reaction elements or compounds? Explain.
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