Wednesday
December 11, 2013

# Posts by zac

Total # Posts: 116

which will become a buffer in 1L of H2O? a) 0.3 mole KOH & 0.3 mole HBr b) 0.5 mole NH3 & 0.5 mole HCl c) 0.2 mole NaCl & 0.3 mole HCl d) 0.2 mole NaOH & 0.2 mole HBr e) 0.4 mole HC2H3O2 & 0.2 mole NaOH I think that the answer is e. Is that correct?

Chemistry
50.0mL of 0.01M Ba(OH)2 is added to 150.0mL of 0.01M HNO3. What is the new pH of the solution?

calculus
A stone is thrown straight down from the edge of a roof, 750 feet above the ground, at a speed of 7 feet per second. A. Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 5 seconds later? B. At what time does the stone hit th...

english
Main Idea: The big rivers in the center of the United States have a constant power that is greater than the human uses for the rivers. I need to provide 3 supporting details for main idea.

Statistics
5. Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6. a. What is the probability that a randomly selected exam will have a score of at least 71? b. What percentage of exams will have scores between 89 and 92? ...

physics
A hawk ﬂies in a horizontal arc of radius 15.7 m at a constant speed of 3.8 m/s. Find its centripetal acceleration. Answer in units of m/s 2 006 (part 2 of 2) 10.0 points It continues to ﬂy along the same horizontal arc but increases its speed at the rate of 1.1...

geography
I would like your help please? The United Kingdom is currently experiencing one of the most severe financial situations for decades. Many Large scale Government development plans have been scraped. The attention of politican is turning to an ongoing project for many years call...

Physics
How long does it take a 23 kW steam engine to do 8.8 x 10^7 J of work?

differential equations
Solve the following equation explicitly by expanding up to order x5, the following 2nd order diff equation. y''(x) = (1 + x^2)*y(x) pls show working y =f(x)

Cal
Express the given quantity in a single logarithm. ln(a + b) + ln(a - b) - 2 ln c

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