2. (5 points) An old lady like me runs 1 mile in exactly 10 minutes. Calculate m

Question

2. (5 points) An old lady like me runs 1 mile in exactly 10 minutes. Calculate my speed in kilometers per hour. (1 mile-1609 meters) 3. (12 points) Balance the following equations. (a) C3Ha 02- CO2 H20 (b) Li2CO3 HCI LiCl CO2 Hzo (c) P4010 H20 H3PO 4. (6 points) For each of the following bonds, indicate the positive and negative end using the symbols 5+ and 6-. (a) H-F (b) C-o (c) Which of these two bonds would you expect to be more polar? Why? 5. (10 points) Complete the following table: 63Cu Protons Neutrons Electron Configuration 6. (9 points) Serotonin is a compound that conducts nerve impulses in the brain. It contains (by mass) 68.2% C, 6.86% H, 15.99% N, and 9.089% 0. Its molar mass is 176 g/mol. Determine its molecular formula.

Explanation / Answer

2)
distance = 1 mile = 1609 m = 1.609 km
time = 10 minutes = 10/60 hour = 1/6 hour

speed = distance / time
= 1.609 km / (1/6) hour
= 9.654 km/hr
Answer: 9.654 km/hr

3)
a)
C3H8 + O2 ----> CO2 + H2O

balance C:
C3H8 + O2 ----> 3CO2 + H2O

balance H:
C3H8 + O2 ----> 3CO2 + 4H2O

balance O:
C3H8 + 5O2 ----> 3CO2 + 4H2O

Answer:
C3H8 + 5O2 ----> 3CO2 + 4H2O

similarly do others

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