Homework Answers Page 10660

• What is the molecular shape of phosphorus trichloride (##PCl_3##)? What are the bond angles in this molecule?

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  Chemistry

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• How do you convert 190 mm Hg to atmospheres of pressure?

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  Chemistry

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• A clock with an iron pendulum keeps correct time at 20C.How much will it lose or gain per day if temperature changes to 40C?Coefficient of cubical expansion of iron =36x10-6C-1

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  Physics

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• Why does NaH2PO4 become acidic in water? I thought this reaction would yield NaOH and HPO4- and NaOH is a strong base! Please explain what happens to the sodium ION. Does it accept a hydroxide?

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  Chemistry

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• Why do you think Operation Rolling Thunder failed to lead to a quick victory?

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  History

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• How do you solve ##sin(60-x)=2sinx##?

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  Geometry

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• What is the biggest planet in our galaxy?

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  Science

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• The density of copper is ##8.96 "g/cm"^3"##. The density of zinc is ##7.14 "g/cm"^3"##. A sample of brass has 70% copper and 30% zinc by mass. What would be the density of this brass sample?

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  Chemistry

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• How do you use a graphing calculator to find the limit of ##(12(sqrtx-3))/(x-9)## as x approaches 0?

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  Calculus

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• How would you balance Na2B4O7 + H2SO4 + H2O --> H3BO3 + Na2SO4?

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  Chemistry

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• How did the Emancipation Proclamation and Grant's appointment as general in chief affect the course of the war?

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  History

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• How do you evaluate ##sec(cos^-1(1/2))## without a calculator?

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  Geometry

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• Can you define and give an example of an observation?

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  Biology

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• How do you calculate percent composition of a mixture?

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  Chemistry

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• Why is surface tension important to life on earth?

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  Chemistry

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• How many amendments have been added to the Constitution?

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  History

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• Is BI3 a stronger Lewis acid than BCl3 and BF3?

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  Chemistry

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• How do you convert -220 degrees to radians without a calculator?

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  Geometry

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• How is nuclear fusion in a main-sequence star different from nuclear fusion in a giant star?

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  Science

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• In human anatomy, what is a crest?

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  Psychology

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• How can geographic isolation lead to speciation?

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  Biology

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• What is the area of a rectangle with length ##(2x+2)##, width ##(x)## and a diagonal of 13?

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  Geometry

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• What peaks in their mass spectra could be used to distinguish between 4-methyl-2-pentanone and 2-methyl-3-pentanone?

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  Chemistry

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• What are some examples of symbolism in the movie, "Rear Window"?

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  English

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• What are the pros and cons of first person, second person and third person limited and omniscient?

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  English

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• Who won the Battle of Tippecanoe?

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  History

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• How do you solve using gaussian elimination or gauss-jordan elimination, ##x + y + z = 0##, ##2x - y + z = 1## and ##x + y - 2z = 2##?

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  Precalculus

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• What is the factorial of 10?

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  Precalculus

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• What do ##a## and ##b## represent in the standard form of the equation for an ellipse?

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  Precalculus

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• In what parts of the heart do you find oxygenated blood and in what parts do you find deoxygenated blood?

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  Psychology

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• What is an oxbow lake and how is it produced?

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  Science

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• The area of a rectangle is ##5 4/5## square meters. The width of the rectangle is ##2 1/4## meter. How long is the rectangle?

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  Geometry

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• Why did many people doubt the Anaconda Plan?

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  History

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• Given that ##a-b=10## and that ##2 * (a+b)^2=64##, what is the value of ##a+b## ?

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  Algebra

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• How do you find the derivative of ##y=cos(x)## from first principle?

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  Calculus

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• How long do humans live in reference to the time scale of the universe?

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  Science

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• What shape is CH4O?

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  Chemistry

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• What are microtubules?

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  Biology

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• How does Columbus characterize the native people?

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  History

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• Methane (CH4) has a normal boiling point of -161.6 C. At this temperature, the delta H condensation= -8.17KJ/mol. If 16.5g of the liquid methane vaporize, how much energy is absorbed. ? Thank you

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  Chemistry

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• How can you calculate partial pressure?

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  Chemistry

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• How do the relative positions of Earth, the moon, and sun cause the phases, tides, and eclipses, and determine time on Earth?

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  Science

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• Does the muscular system have any organs?

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  Psychology

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• What is GPS and how does it work?

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  Science

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• What is radioactivity?

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  Physics

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• A. How many grams of KOH are needed to neutralize 18.25 g of HCl? b. How many moles of each are involve in this reaction? Thanks

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  Chemistry

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• What are the differences of interference color and birefringence ?

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  Science

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• What is the lowest point on earth?

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  Science

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• How many millimoles of HCl are contained in ##5.00 xx 10^1 "mL"## of 5.00% (by mass) aqueous HCl solution (density = ##"1.02 g/mL"## )? What volume of 5.00 M NaOH solution would be needed to neutralize ##5.00 xx 10^1 "mL"## of 5.00% HCl solution?

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  Chemistry

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• How to use the distance formula to find the radius of a circle?

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  Algebra

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