Question

Name Worksheet 8 - Chemical Reactions Directions: Answer each of the following questions. Be sure to complete sentences where appropriate. For full credit be sure to show all of your work. Where appropriate anwes should be boxed for clarity, written to the correct number of significant figures, and include proper units. Remember to include phase labels in your balanced chemical reactions. 1. Single Replacement Reactions - Write the correctly balanced chemical equation for cach and write which clement is more active. Be sure to include state labels on your equations. Note that all metals will form a cation with a +2 charge if they react. a. If a piece of manganese metal is placed into a solution of zinc nitrate, Zn(NO), the manganese begins to dissolve and a precipitate begins to form on the bottom of the test tube. Write a balanced chemical equation for the reaction that is taking place. b. Which element is more active, Zn or Mn? c. If a second piece of manganese metal is placed into a solution of barium nitrate, Ba(NO).. no visible reaction takes place. Which element is more active, Mn or Ba? Two test tubes were set up: Test tube #1 - Zinc metal in a solution of manganese(II) nitrate Test tube 82. Barium metal in a solution of zinc nitrate d. Predict which test tube will show a reaction. e. Write a balanced chemical equation for this reaction. 2. Double Replacement Reactions - Write the correctly balanced chemical equation for each and indicate what kind of evidence of reaction you would be likely to observe. Be sure to include state labels on your equations. a. Na,PO, (ag) + FeCl, (ag) b. Evidence of reaction:

Answer 1

Answer 1) a):- Mn(s) + Zn(NO₃)₂ (aq) $\rightarrow$ Mn(NO₃)₂ (aq) + Zn (s)

b):- Mn ( manganese) is more reactive than Zn.

c) Ba (barium) is more reactive than Mn. Thus, Mn is unable to displace Ba from barium nitrate.

d):- test tube #2 shows reaction.

Test tube #1 does not shows any reaction. This is because Zn metal is lesser reactive than Mn and would not be able to displace it from its salt solution , that is,from manganese nitrate solution.

e):- The balanced chemical equation for the reaction that occurs in test tube #2.

Ba (s) + Zn(NO₃)_{2 (aq)} $\rightarrow$ Ba(NO₃)_{2 (aq)} + Zn (s)

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2) a):- Na​​​​​​​​​​​​​​_{3​​​​​​​}PO₄ (aq) + FeCl₃ (aq)  $\rightarrow$ 3 NaCl (aq) + FePO₄ (s)

b):- Evidence of reaction: Appearance of yellow-brown precipitate due to iron(III) phosphate.