Answers edited by Oscar L.

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• What is an example of a double displacement reaction?
  
• If #sintheta=1/3# and #theta# is in quadrant I, how do you evaluate #sin2theta#?
  
• What is the closest star to Earth besides the sun?
  
• How much oxygen is the earth made of?
  
• In the southern hemisphere, does the Moon appear to start its waxing phase in reverse?
  
• What is the moho discontinuity state of matter?
  
• What is the Mojo layer inside the earth? How far down is it inside the earth?
  
• The smallest daily tidal range occurs during which type of tide?
  
• How do I evaluate cos(pi/5) without using a calculator?
  
• Jupiter has sixteen satellites. What were the four largest ones discovered by Galileo?
  
• Why are the rocks on the moon older than those on earth?
  
• 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?
  
• 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 silicate mineral is the basic building block of many rocks?
  
• What observation of seismic-wave travel led to the discovery of Moho?
  
• Is the outer core made of iron and nickel?
  
• How could the freezing point depression of #CaCl_2# be smaller than #NaCl#?
  
• Question #f635a
  
• How many AU are between Saturn's largest moon, Titan from the sun and the earth?
  
• Question #f339c
  
• Question #3f6e6
  
• Question #bdf57
  
• What is the net ionic reaction for the acid-base reaction of #"HCl"# with #"NaNO"_3#?
  
• Clive's paper was returned with the answer "barium ll carbonate" marked wrong for the formula #BaCO_3#. Why was his answer wrong?
  
• Question #39c68
  
• How do nonmetals react with acids?
  
• 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.
  
• How do you evaluate #sec(sec^-1(1/3))#?
  
• How do you find the square roots of #-25i#?
  
• How do you balance #Zn(OH)_2 + CH_3COOH -> Zn(CH_3COO)_2 + H_2O#?
  
• 22.4 L of hydrogen gas contains how many molecules?
  
• Question #bb58b
  
• 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#
  
• What is the equation of the circle with a center at #(7 ,1 )# and a radius of #2 #?
  
• What is earth's lower mantle made of?
  
• How do scientists determine when one layer of the earth begins and ends?
  
• How do you simplify hyperbolic function #cosh(lnt)#?
  
• How do you simplify #arcsin(sin(pi/8))#?
  
• How many significant figures are in the measurement 811.40 grams?
  
• How do you evaluate # tan(sin^-1(-1/6))#?
  
• Question #19980
  
• What are examples of transition metals and their uses?
  
• 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 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?
  
• What is the standard form of #y=(x-3)^2+3#?
  
• Question #69fd6
  
• Which planet experiences constant daylight or darkness for 42 years at its poles?
  
• 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?
  
• How many known satellites does Mars have?
  
• How do you express #cos(pi/ 3 ) * sin( ( 5 pi) / 8 ) # without using products of trigonometric functions?
  
• Why do stellar parallax measurements work only with relatively nearby stars?
  
• What do scientists learn about fossils by using carbon-14?
  
• What is the angle between #<-8,-5,2 > # and #<9,1,-3> #?
  
• How would you balance the following equation: #"S" + "HNO"_3 -> "H"_2"SO"_4 + "NO"_2 + "H"_2"O"# ?
  
• What happens when the sun becomes a Black Dwarf? When will this take place in the future?
  
• 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?
  
• How do you evaluate #cot (690)#?
  
• Decomposition of a #97.1*g# mass of potassium chlorate, #KClO_3#, yields what mass of dioxygen?
  
• Which planet has a moon with active volcanoes?
  
• Question #f472a
  
• 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?
  
• Is it possible for the earth to be sucked into a black hole? If so, what would happen?
  
• What is the integral of #int tan^5(x)#?
  
• Question #7221f
  
• What is the moho and what is it made of?
  
• What are the six strongest acids? What are the six strongest bases?
  
• Where does the production of Carbon-14 occur?
  
• What is the dominant mountain range on the East Coast?
  
• Does special relativity affect biological processes, such as aging?
  
• Question #07d32
  
• In the fourth dimension, is it possible to have a quadruple bond?
  
• What was Andrija Mohorovicic famous for?
  
• How many molecules are in 165 g of carbon dioxide?
  
• 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 does Ksp mean in chemistry?
  
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