Answers edited by Oscar L.

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• 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 the moho and what is it made of?
  
• How do you evaluate `tan(sin^-1(-1/6))`?
  
• What is the integral of `int tan^5(x)`?
  
• How many molecules are in 165 g of carbon dioxide?
  
• Clive's paper was returned with the answer "barium ll carbonate" marked wrong for the formula `BaCO_3`. Why was his answer wrong?
  
• What are examples of transition metals and their uses?
  
• What is an example of a double displacement reaction?
  
• Question #f339c
  
• What is the standard form of `y=(x-3)^2+3`?
  
• 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 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?
  
• How do you evaluate `cot (690)`?
  
• How do you evaluate `sec(sec^-1(1/3))`?
  
• How many known satellites does Mars have?
  
• Which planet has a moon with active volcanoes?
  
• How do you balance `Zn(OH)_2 + CH_3COOH -> Zn(CH_3COO)_2 + H_2O`?
  
• Question #3f6e6
  
• Question #7221f
  
• Is the earth slowly getting closer to the sun as it orbits it? If not, what keeps it from being drawn into the sun?
  
• In the fourth dimension, is it possible to have a quadruple bond?
  
• How do I evaluate cos(pi/5) without using a calculator?
  
• Question #bb58b
  
• What is earth's lower mantle made of?
  
• If there is a supermassive black hole at the centre of our galaxy, why is our galaxy so stable?
  
• 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?
  
• What is the Mojo layer inside the earth? How far down is it inside the earth?
  
• What is the closest star to Earth besides the sun?
  
• What observation of seismic-wave travel led to the discovery of Moho?
  
• How do you simplify hyperbolic function `cosh(lnt)`?
  
• Question #07d32
  
• How do you simplify `arcsin(sin(pi/8))`?
  
• 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 scientists determine when one layer of the earth begins and ends?
  
• Where does the production of Carbon-14 occur?
  
• Question #69fd6
  
• 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?
  
• How do you express `cos(pi/ 3 ) * sin( ( 5 pi) / 8 )` without using products of trigonometric functions?
  
• What happens when the sun becomes a Black Dwarf? When will this take place in the future?
  
• Question #19980
  
• Why do stellar parallax measurements work only with relatively nearby stars?
  
• What do scientists learn about fossils by using carbon-14?
  
• How much oxygen is the earth made of?
  
• What does Ksp mean in chemistry?
  
• Question #39c68
  
• The smallest daily tidal range occurs during which type of tide?
  
• In the southern hemisphere, does the Moon appear to start its waxing phase in reverse?
  
• How could the freezing point depression of `CaCl_2` be smaller than `NaCl`?
  
• Is the outer core made of iron and nickel?
  
• What is the moho discontinuity state of matter?
  
• Question #f635a
  
• 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?
  
• Question #bdf57
  
• 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 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?
  
• What is the dominant mountain range on the East Coast?
  
• 22.4 L of hydrogen gas contains how many molecules?
  
• Decomposition of a `97.1*g` mass of potassium chlorate, `KClO_3`, yields what mass of dioxygen?
  
• What silicate mineral is the basic building block of many rocks?
  
• Question #f472a
  
• 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?
  
• How many significant figures are in the measurement 811.40 grams?
  
• How do you find the square roots of `-25i`?
  
• If `sintheta=1/3` and `theta` is in quadrant I, how do you evaluate `sin2theta`?
  
• How many AU are between Saturn's largest moon, Titan from the sun and the earth?
  
• Jupiter has sixteen satellites. What were the four largest ones discovered by Galileo?
  
• What was Andrija Mohorovicic famous for?
  
• What is the equation of the circle with a center at `(7 ,1 )` and a radius of `2`?
  
• How would you balance the following equation: `"S" + "HNO"_3 -> "H"_2"SO"_4 + "NO"_2 + "H"_2"O"` ?
  
• What is the net ionic reaction for the acid-base reaction of `"HCl"` with `"NaNO"_3`?
  
• How do nonmetals react with acids?
  
• Does special relativity affect biological processes, such as aging?
  
• Is it possible for the earth to be sucked into a black hole? If so, what would happen?
  
• What is the angle between `<-8,-5,2 >` and `<9,1,-3>`?
  
• Why are the rocks on the moon older than those on earth?
  
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