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Author Question: Which of the following elements are fourth period semimetals? A) Si and Ge B) Ge and As C) Sb ... (Read 58 times)

genevieve1028

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on: Aug 27, 2018
Which of the following elements are fourth period semimetals?
 
  A) Si and Ge
  B) Ge and As
  C) Sb and Te
  D) Po and At
  E) none of the above

Question 2

How many milliliters of 0.550 M hydriodic acid are needed to react with 15.00 mL of 0.217 M CsOH? HI(aq) + CsOH(aq)  CsI(aq) + H2O(l)
 
  A) 0.0263 mL
  B) 0.169 mL
  C) 5.92 mL
  D) 38.0 mL

Question 3

If we start with 1.000 g of cobalt-60, 0.400 g will remain after 7.00 yr. This means that the half-life of cobalt-60 is ________ yr.
 
  A) 12.1
  B) 17.5
  C) 2.80
  D) 5.30
  E) 7.65


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irishcancer18

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Reply #1 on: Aug 27, 2018
Answer to Question 1

B

Answer to Question 2

C

Answer to Question 3

D


genevieve1028

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Reply 2 on: Aug 27, 2018
Wow, this really help

bbburns21

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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