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When 24.6 mL of 0.500 M H2SO4 is added to 24.6 mL of 1.00 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate ΔH of this reaction. (Assume that the total volume is the sum of the individual volumes and that the density and specific heat capacity of the solution are the same as for pure water.) (d for water = 1.00 g/mL; c for water = 4.184 J/g·°C.)
Can the sample standard deviations s1 and s2 be used in place of the population standard deviations σ1 and σ2?
a. Find the population density of the country, to the nearest tenth, in 1900 and in 1980. b. Find the percent increase in population density, to the nearest tenth of a percent, from 1900 to 1980.
The sum of the lengths of any two sides of a triangle must be greater than the third side.
Let R be a PID. Consider the Diophantine equation ax+by=N where a,b and N are integers and a,b are nonzero. Suppose x_0, y_0 is a solution: ax_0+by_0=N.
Consider each of the following scenarios and state whether or not the variable in question is a confounder, and why.
A particular test for the presence of steroids is to be used after a professional track meet. If steroids are present, the test will accurately indicate this 95% of the time.
If you are standing at the point (0, 0, 0), in what direction should you move to increase your temperature the fastest?
Chris, a small business owner, has identified a store site in a shopping mall in Atlanta. The mall owner offered him to alternatives: one location with 10,000 square feet and the other with 15,000 square feet.
At a June 2010 summit of the G-20, President Obama urged member nations to continue stimulus spending to maintain economic growth.
Draw a scatter diagram of the data treating weight as the independent variable.
Determine whether the LTIC systems characterized by the following impulse responses are memoryless, causal, and stable. Justify your answer.
How many are interested in exactly one kind of show?
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