Answers edited by Oscar L.

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• 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 equation of the circle with a center at #(7 ,1 )# and a radius of #2 #?
  
• Is the earth slowly getting closer to the sun as it orbits it? If not, what keeps it from being drawn into the sun?
  
• If there is a supermassive black hole at the centre of our galaxy, why is our galaxy so stable?
  
• Question #f635a
  
• In the southern hemisphere, does the Moon appear to start its waxing phase in reverse?
  
• How much oxygen is the earth made of?
  
• 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.
  
• What is earth's lower mantle made of?
  
• How do nonmetals react with acids?
  
• What is the moho discontinuity state of matter?
  
• What is the net ionic reaction for the acid-base reaction of #"HCl"# with #"NaNO"_3#?
  
• 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?
  
• In the fourth dimension, is it possible to have a quadruple bond?
  
• Question #7221f
  
• What is an example of a double displacement reaction?
  
• Question #f472a
  
• What is the integral of #int tan^5(x)#?
  
• How would you balance the following equation: #"S" + "HNO"_3 -> "H"_2"SO"_4 + "NO"_2 + "H"_2"O"# ?
  
• How many significant figures are in the measurement 811.40 grams?
  
• Is it possible for the earth to be sucked into a black hole? If so, what would happen?
  
• How do you express #cos(pi/ 3 ) * sin( ( 5 pi) / 8 ) # without using products of trigonometric functions?
  
• 22.4 L of hydrogen gas contains how many molecules?
  
• What silicate mineral is the basic building block of many rocks?
  
• What are examples of transition metals and their uses?
  
• Is the outer core made of iron and nickel?
  
• How do you evaluate # tan(sin^-1(-1/6))#?
  
• Where does the production of Carbon-14 occur?
  
• 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?
  
• Question #bdf57
  
• What does Ksp mean in chemistry?
  
• How do you simplify hyperbolic function #cosh(lnt)#?
  
• Why do stellar parallax measurements work only with relatively nearby stars?
  
• How do you evaluate #cot (690)#?
  
• What is the closest star to Earth besides the sun?
  
• How many AU are between Saturn's largest moon, Titan from the sun and the earth?
  
• 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?
  
• 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 do scientists learn about fossils by using carbon-14?
  
• What is the angle between #<-8,-5,2 > # and #<9,1,-3> #?
  
• How do you simplify #arcsin(sin(pi/8))#?
  
• Why are the rocks on the moon older than those on earth?
  
• Question #69fd6
  
• Which planet experiences constant daylight or darkness for 42 years at its poles?
  
• Does special relativity affect biological processes, such as aging?
  
• How do you evaluate #sec(sec^-1(1/3))#?
  
• How many known satellites does Mars have?
  
• Question #07d32
  
• What is the dominant mountain range on the East Coast?
  
• Question #19980
  
• Question #bb58b
  
• Question #f339c
  
• Question #3f6e6
  
• What was Andrija Mohorovicic famous for?
  
• How many molecules are in 165 g of carbon dioxide?
  
• Jupiter has sixteen satellites. What were the four largest ones discovered by Galileo?
  
• What happens when the sun becomes a Black Dwarf? When will this take place in the future?
  
• How could the freezing point depression of #CaCl_2# be smaller than #NaCl#?
  
• Which planet has a moon with active volcanoes?
  
• 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#
  
• 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 do you balance #Zn(OH)_2 + CH_3COOH -> Zn(CH_3COO)_2 + H_2O#?
  
• How do scientists determine when one layer of the earth begins and ends?
  
• If #sintheta=1/3# and #theta# is in quadrant I, how do you evaluate #sin2theta#?
  
• Decomposition of a #97.1*g# mass of potassium chlorate, #KClO_3#, yields what mass of dioxygen?
  
• What is the moho and what is it made of?
  
• What is the Mojo layer inside the earth? How far down is it inside the earth?
  
• What are the six strongest acids? What are the six strongest bases?
  
• 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?
  
• How do I evaluate cos(pi/5) without using a calculator?
  
• How do you find the square roots of #-25i#?
  
• The smallest daily tidal range occurs during which type of tide?
  
• What is the standard form of #y=(x-3)^2+3#?
  
• 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?
  
• Question #39c68
  
• What observation of seismic-wave travel led to the discovery of Moho?
  
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