Experiment #10. Periodic Trends PRE-LABORATORY ASSIGNMENT NAME 1. For each of th

Question

Experiment #10. Periodic Trends PRE-LABORATORY ASSIGNMENT NAME 1. For each of the following, circle the correct element SECTION a. An alkaline carth metal b. An alkali metal c. A chalcogen d. Most electronegative e. Highest first ionization energy f. A transition metal g. A halogen Mo O Dy Ca Fe Li Fe BO At Mo Dy Ce Al P Ca N Be C K O N B Ag Ga Ge S h. A lanthanide Ge N Er Al S The elements D and Q are in the same chemical family. Both have negatively charged ionic forms. When an aqueous solution containing the ion D is shaken with a methylene chloride solution of the element Q the bottom layer changes color. Which of the two elements, D or Q, has the higher electron affinity? Explain.

Explanation / Answer

I will answer question 1 and 4.

Question 4:

Sr(NO3)2(aq) + (NH4)2C2O4(aq) --------> SrC2O4(s) + 2NH4NO3(aq)
Sr2+(aq) + 2NO3-(aq) + 2NH4+(aq) + C2O42-(aq) --------> SrC2O4(s) + 2NH4+(aq) + 2NO3-(aq)
Net ionic equation: Sr2+(aq) + C2O42-(aq) --------> SrC2O4(s)

Question 1:
a) Ca
b) Li
c) O
d) O
e) Be
f) Ag
g) Br
h) Er

Hope this helps

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