Answers created by Oscar L.

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• What is the order from lowest to highest priority of -F, -CH3, -COOH, -CH2F according to the IUPAC approved sequence rules?
  
• A man walks 2 km east and then 4 km at 60° north of east. What is the magnitude and direction of the resultant displacement?
  
• Is enthalpy always negative?
  
• How do you convert #6=(5x+4y)^2-7x# into polar form?
  
• What causes the small planetesimals to form larger protoplanets?
  
• How are gems different from regular minerals?
  
• How to find the sum of the harmonic sequence below? #1/3# + #1/6# + #1/9# + #1/12#
  
• The reaction between a liquid substance 'M' and sodium trioxocarbonate (IV) gives a gas which turns limewater milky. Therefore 'M' is? (a) H2SO4 (b) Na2SO4 (c) KL (d) NaOH
  
• How to solve this polynomial equation?
  
• How does gamma decay change the nucleus?
  
• How many positive integer solutions are there to the following? This is from a non-calculator test.
  
• Explain why the value of the heat of neutralization of strong acids by the strong base is constant?
  
• A sketch of the Roosevelt Room in the White House is drawn to #1/15# scale. The sketch shows a room that is 3 feet by 4.5 feet. What are the actual dimensions of the room?
  
• Name a transition element which has no variable oxidation state?
  
• Stress refers to the force applied to a material, whereas strain refers to the ____?
  
• What the is the polar form of #x^2-y^2 = 6x+-x^2y-y #?
  
• A front forms _______ A. Inside an air mass B. Between 2 air masses C. Above 2 air masses ?
  
• What is the final answer of 2.169/0.68?
  
• Why is Calcium Hydroxide “relatively insoluble”? I mixed NaOH(aq) and CaCl2(aq) and somehow there’s precipitate, despite the fact that calcium in OH is said to be soluble.
  
• What is the difference between a red and brown dwarf?
  
• A steep-sided hill of glacial sediment formed when a glacier melts best describes which glacial landform?
  
• Rank the following species in order of increasing density?
  
• What two elements make up over 99% of the observable universe?
  
• What is the solution to -6x+3=3x+2-9x ?
  
• What are small, flat-topped hills found in the Southwest called?
  
• What is the ground state shorthand notation for arsenic (as)?
  
• If carbon 12, 13 and 14 are different forms of carbon, what is the 'original' form of carbon?
  
• Are black holes and neutron star non luminous?
  
• How do you simplify #sqrt3sqrt21#?
  
• How do you find the five remaining trigonometric functions of this problem?
  
• How do you solve 5(cos^3)x=5cos x over the interval (0,2pi)?
  
• The process by which the earth is divided up into layers with different densities is called what?
  
• Find all real numbers in interval [0,2π)? sin x cos(π/4)+cos x sin (π/4)=1/2
  
• What is a spring tide and what causes this phenomenon?
  
• What causes much of the east-southeastern part of the country to experience warm, humid, and marine west coast climates?
  
• Cot theta +Csc theta - 1/cot theta - csc theta +1=?
  
• If 𝐴 = #sqrt(1+cos 320°)/2# and 𝐵 = #sqrt( 1−cos 320°)/ 2# , then 𝐴 + 𝐵 =?
  
• A triangle has sides A, B, and C. The angle between sides A and B is #pi/4# and the angle between sides B and C is #pi/12#. If side B has a length of 17, what is the area of the triangle?
  
• What is fraction of a day is 8 hour ?
  
• How do you solve # sin(x) + sin 2(x) = 0#?
  
• How do you convert #rsinθ=10# into a rectangular equations?
  
• How do you solve: #sin^2(2x)+2cos^2(x) <2# ? Thank you
  
• Why is water in a glass cup quickly warmed in a microwave oven, but the glass cup itself warms much more slowly, if at all?
  
• Although the noble gas elements are monatomic and could not give rise to dipole-dipole forces or hydrogen bonding, these elements still can be liquefied and solidified. Could you explain this?
  
• The total number of electrons in orbitals with ml = 0 for Sr? a) 2 b) 10 c) 12 d) 18 e) 34
  
• The bottom of a ladder must be placed 3 feet from a wall. The ladder is 12 feet long. How far above the ground does the ladder touch the wall?
  
• How do you solve #3/(b+2)=4/b#?
  
• How far away is Jupiter's moon Europa from the sun?
  
• A triangle has sides A, B, and C. Sides A and B have lengths of 8 and 10, respectively. The angle between A and C is #(5pi)/8# and the angle between B and C is # (5pi)/24#. What is the area of the triangle?
  
• How do you solve #x^2-8x+5=0#?
  
• How to find the values of #Lambda# for which the homogeneous linear system has nontrivial solutions?
  
• What is #9/57 -: 8/23#?
  
• Which of the compounds would you expect to have the highest melting point NaCl, H2Se, O2, H2O, H2S, CO2, MgO?
  
• How long does it take the moon to orbit the earth?
  
• What is the name for raindrops that freeze as they fall through the air?
  
• Which best describes the motion of helium atoms in gaseous helium? A. The helium atoms can slide past another one? B. The helium atoms move quickly in all direction ? C. The helium atoms are fixed in one place? D. The helium atoms move slowly only after
  
• How do I find the slope of the line which passes through the points #(0, -5)# and #(-5, 12)#?
  
• The weak acid is represented by? Choose one: the gray and green spheres the gray and purple spheres the gray and yellow spheres
  
• How can complementary angles not be adjacent but share a common vertex?
  
• Find the perimeter P of ▱JKLM with vertices J(2,2),K(5,3),L(5,−3),and M(2,−4). Round your answer to the nearest tenth, if necessary?
  
• Question #13738
  
• Two countries are halfway around the world from each other (by E to W) and lie on the 17 degree north latitude. Earth's radius is 3790 miles at that latitude. Would flying west to the other country be shorter, or would flying directly north be shorter?
  
• A #DeltaABC# is right angled at #B#. Find the value of?
  
• Question #0c98d
  
• Question #2d2ca
  
• What is the largest value of #a# for which the circle #x^2+y^2=a^2# lies completely inside the parabola #y^2=4(x+4)# ?
  
• Factorize #x^4–3x^3+4x^2-8# ?
  
• for x ≠ kπ, k∈Z show that: sin8x / 8sinx = cosx.cos2x.cos4x deduce the value of E = cosπ / 7.cos2π / 7.cos4π / 7 ?
  
• #/_X# and #/_Y# are supplementary. One angle measures 5 times the other angle. What is the complement of the smaller angle?
  
• Question #60298
  
• Question #d467b
  
• Which metamorphic rock has an even grain and can be cut into thin slabs or easily carved?
  
• Question #124ba
  
• Question #0cbe1
  
• The number of solution of the equation cosx cos2x cos3x=1/4?
  
• Why have efforts to reduce sulfur oxide emissions met with greater success than those directed at nitrogen oxide emissions reductions?
  
• The legs of a right triangle have lengths #x+2# and# x +6#. The hypotenuse has length #2x#. What is the perimeter of the triangle?
  
• Equilateral triangle ABC. AD - its altitude. E - side's AB midpoint. What are the angles of the triangle AND?
  
• If #a+b=1# and #a>0# and# b>0# can you prove this ? #[1+(1/(aⁿ))][1+(1/(bⁿ))] ≥ ( 1+2³)²#
  
• Question #233da
  
• Question #1cd27
  
• How do I factorise (x+1)(x+2)(x+3)(x+4)-120 ?
  
• Factorise? a) x^4+2x^3+3x^2+2x+1
  
• What forms when carbon-14 decays?
  
• Question #bc254
  
• Question #3c0ea
  
• Question #affe9
  
• Based on the protoplanet hypothesis, how did the earth end up being layered the way it is?
  
• Please help me with the question below?
  
• A light emitting diode (L.E.D.) emits photons with an energy of #2.84 xx 10^-19# J. What is the energy per mole of photons emitted?
  
• Why are gravitational, electromagnetic, and nuclear forces often called fundamental or basic forces?
  
• Calculate mass of oxalic acid (H2C2O4.2H2O) needed to prepare 250 ml ,1 M aqueous solution of oxalic acid . I got 15 g . Is my answer correct ?
  
• Question #a5b2a
  
• Question #97168
  
• How much heat must be removed to freeze a tray of ice cubes at 0C? The mass of the water is 225 g?
  
• Why does #"Zn"^(2+)# have #18# electrons in its outer shell? Does it have to follow the octet rule?
  
• What reagent could NOT be used to separate #OH^-# from #Cl^-# when added to an aqueous solution containing both?
  
• What are three ways that Earth is different from other planets?
  
• Question #39b7b
  
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