Answers edited by Oscar L.

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• What observation of seismic-wave travel led to the discovery of Moho?
  
• What happens when the sun becomes a Black Dwarf? When will this take place in the future?
  
• How do you express #cos(pi/ 3 ) * sin( ( 5 pi) / 8 ) # without using products of trigonometric functions?
  
• How do I evaluate cos(pi/5) without using a calculator?
  
• Question #07d32
  
• Boron has two isotopes, boron-10 and boron-11. Boron-10 has five protons and five neutrons. How many protons and neutrons does boron-11 have? Explain.
  
• Why do stellar parallax measurements work only with relatively nearby stars?
  
• What is earth's lower mantle made of?
  
• How do you simplify hyperbolic function #cosh(lnt)#?
  
• How could the freezing point depression of #CaCl_2# be smaller than #NaCl#?
  
• Given the following, what is the tension in the string when the nearest mass is a distance of 686 km from the Black hole? #G=6.673×10^-11 m^3kg-1s-2#
  
• If sides A and B of a triangle have lengths of 1 and 6 respectively, and the angle between them is #(pi)/2#, then what is the area of the triangle?
  
• What is the dominant mountain range on the East Coast?
  
• What is the Mojo layer inside the earth? How far down is it inside the earth?
  
• What are examples of transition metals and their uses?
  
• Question #19980
  
• How much oxygen is the earth made of?
  
• What is the equation of the circle with a center at #(7 ,1 )# and a radius of #2 #?
  
• What does Ksp mean in chemistry?
  
• In the fourth dimension, is it possible to have a quadruple bond?
  
• Decomposition of a #97.1*g# mass of potassium chlorate, #KClO_3#, yields what mass of dioxygen?
  
• Why are the rocks on the moon older than those on earth?
  
• A 2% by weight aqueous solution of NaCl (MW= 58.45) has a boiling point of 100.31 °C. What is the van't Hoff factor for NaCl?
  
• How would you balance the following equation: #"S" + "HNO"_3 -> "H"_2"SO"_4 + "NO"_2 + "H"_2"O"# ?
  
• How do you balance #Zn(OH)_2 + CH_3COOH -> Zn(CH_3COO)_2 + H_2O#?
  
• Question #f635a
  
• Question #7221f
  
• How many known satellites does Mars have?
  
• How do you simplify #arcsin(sin(pi/8))#?
  
• Is the Solar Wind comprised of actual matter along with energy? If so, is there a point at which the gravitational attraction of the Sun overcomes the Solar Wind?
  
• Question #bb58b
  
• If #sintheta=1/3# and #theta# is in quadrant I, how do you evaluate #sin2theta#?
  
• What is an example of a double displacement reaction?
  
• How many AU are between Saturn's largest moon, Titan from the sun and the earth?
  
• A man heats a balloon in the oven. If the balloon initially has a volume of 4 liters and a temperature of 20°C, what will the volume of the balloon be after he heats it to a temperature of 250°C?
  
• Which planet has a moon with active volcanoes?
  
• How do you evaluate #sec(sec^-1(1/3))#?
  
• How do nonmetals react with acids?
  
• The respective masses in amu of the proton, the neutron, and the nckel-60 atom are 1.00728, 1.00867, and 59.9308. What is the mass defect of the nickel-60 atom in g?
  
• In the southern hemisphere, does the Moon appear to start its waxing phase in reverse?
  
• The smallest daily tidal range occurs during which type of tide?
  
• What is the integral of #int tan^5(x)#?
  
• Question #39c68
  
• How do scientists determine when one layer of the earth begins and ends?
  
• What do scientists learn about fossils by using carbon-14?
  
• Question #bdf57
  
• How many molecules are in 165 g of carbon dioxide?
  
• How many significant figures are in the measurement 811.40 grams?
  
• It is generally agreed that the earth's moon was formed when a Mars sized planet grazed the early earth. Is it possible that this planet was slightly bigger and that it not only formed the moon but the left over went on to end up as Mercury?
  
• Clive's paper was returned with the answer "barium ll carbonate" marked wrong for the formula #BaCO_3#. Why was his answer wrong?
  
• What is the standard form of #y=(x-3)^2+3#?
  
• What was Andrija Mohorovicic famous for?
  
• What silicate mineral is the basic building block of many rocks?
  
• What is the net ionic reaction for the acid-base reaction of #"HCl"# with #"NaNO"_3#?
  
• How do you evaluate # tan(sin^-1(-1/6))#?
  
• What is the moho discontinuity state of matter?
  
• Does special relativity affect biological processes, such as aging?
  
• What is the closest star to Earth besides the sun?
  
• Where does the production of Carbon-14 occur?
  
• Is the earth slowly getting closer to the sun as it orbits it? If not, what keeps it from being drawn into the sun?
  
• 22.4 L of hydrogen gas contains how many molecules?
  
• What is the angle between #<-8,-5,2 > # and #<9,1,-3> #?
  
• Jupiter has sixteen satellites. What were the four largest ones discovered by Galileo?
  
• Which planet experiences constant daylight or darkness for 42 years at its poles?
  
• What are the six strongest acids? What are the six strongest bases?
  
• Is the outer core made of iron and nickel?
  
• Question #3f6e6
  
• Is it possible for the earth to be sucked into a black hole? If so, what would happen?
  
• How do you find the square roots of #-25i#?
  
• How do you evaluate #cot (690)#?
  
• If there is a supermassive black hole at the centre of our galaxy, why is our galaxy so stable?
  
• Question #f339c
  
• A triangle has sides A, B, and C. Sides A and B have lengths of 2 and 4, respectively. The angle between A and C is #(7pi)/24# and the angle between B and C is # (5pi)/8#. What is the area of the triangle?
  
• What is the moho and what is it made of?
  
• Question #f472a
  
• Question #69fd6
  
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