September 13th
Contact page
I used to drive from Boston to Grand Rapids and back a few times a year.
The trip one-way is 835 miles. My car gets about 30 miles a gallon. With
gas costing $3.75 a gallon, how much would I spend on gas to drive from
Boston to Grand Rapids?
How many minutes in one year?
Estimates are that 1.4 billion smart phones will be in use in the world by
the end of 2013. A smart phone has about 0.034 grams of gold in it. The
density of gold is 19.3 grams per cubic centimeter. How many cubic meters
of gold are in 1.4 billion smart phones?
Google had revenues in Q3 2013 of 1.41 billion dollars. What were its
revenues on a per-minute basis?
I used to drive from Boston to Grand Rapids and back a few times a year.
The trip one-way is 835 miles. My car gets about 30 miles a gallon. With
gas costing $3.75 a gallon, how much would I spend on gas to drive from
Boston to Grand Rapids?
How many minutes in one year?
Estimates are that 1.4 billion smart phones will be in use in the world by
the end of 2013. A smart phone has about 0.034 grams of gold in it. The
density of gold is 19.3 grams per cubic centimeter. How many cubic meters
of gold are in 1.4 billion smart phones?
Google had revenues in Q3 2013 of 1.41 billion dollars. What were its
revenues on a per-minute basis?
Michigan Test for Teacher Certification Study Guide
HBr(aq) + NaOH(aq) --> NaBr(aq) + H2O(l)
The reaction shown above is studied in a constant-pressure
calorimeter with a heat capacity of 500 J/°C. In the experiment,
100 mL of 0.10 M HBr and 100 mL of 0.10 M NaOH are mixed.
The entire system, including both solutions, started at 20.00°C,
and the final temperature was 20.42°C. Assuming [...], solution
densities of 1.00 g/mL, and solution specific heats of 4.184 J/g•°C,
what is the approximate value of ∆H for the reaction?
A. -35 kJ/mol
B. -40 kJ/mol
C. -56 kJ/mol
D. -123 kJ/mol
HBr(aq) + NaOH(aq) --> NaBr(aq) + H2O(l)
The reaction shown above is studied in a constant-pressure
calorimeter with a heat capacity of 500 J/°C. In the experiment,
100 mL of 0.10 M HBr and 100 mL of 0.10 M NaOH are mixed.
The entire system, including both solutions, started at 20.00°C,
and the final temperature was 20.42°C. Assuming [...], solution
densities of 1.00 g/mL, and solution specific heats of 4.184 J/g•°C,
what is the approximate value of ∆H for the reaction?
A. -35 kJ/mol
B. -40 kJ/mol
C. -56 kJ/mol
D. -123 kJ/mol