Answers edited by Oliver S.
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How long does a ball take to fall from a roof to the ground 7 m below?
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Why is absolute zero important?
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What is the pH of the solution which results from mixing 20.0mL of 0.50M HF(aq) and 50.0mL of 0.20M NaOH(aq) at 25 centigrades? (Ka of HF = 7.2 x 10^-4)
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What is the ratio of lactic acid (Ka = 1.37x10-4) to lactate in a solution with pH =4.59?
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Why did some nations embrace totalitarianism after World War I?
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For λ = 5.0 X 10^5m
calculate the
(i) fractional uncertainty in d. (ii) percentage uncertainty in d^2 ?
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What are some common acids found in the home with the amount of pH valve it contains?
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Name a molecule which does not have π bond in it?
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How do you differentiate #f(x)=2sinx-tanx#?
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What's the equilibrium pH of an initially 0.64M solution of the monoprotic acid benzoic acid (HA) at #25^@ "C"# (Ka = 6.3 x 10^-5) ?
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Given pKa of weak acid HX is 4.2, what is the buffer created by mixing equal volume of 0.2M HX with 0.1 M NaOH?
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What is the gravitational force that the Sun exerts on Jupiter?
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If 30 mL of 0.10 M NaOH is added to 40 mL of 0.20 M HC2H3O2, what is the pH of the resulting solution at 25°C? Ka for HC2H3O2 is 1.8 x 10^–5 at 25°C.
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What is the H-R diagram?
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Are they both right? why?
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What is the cofficient of Cr^2+?
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Uranium-238 decays very slowly with a half life of 4.5 billion years. what percentage of a sample of uranium-238 would remain after 13.5 billion years?
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When wood is burned, new substances are produced. What kind of reaction is this and what type of change occurs?
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What were the provisions of the Treaty of Versailles?
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Write half reactions for the following equation? : #Mg_((aq))^(+2) + Mn_((s)) -> Mg_((s)) + Mn_((aq))^(+4) #
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Why did North Korea become communist?
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How was the presumed age of the Universe determined?
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What happened to Germany after WWII?
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What is the slope and y-intercept of the line y=-5x+2?
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Will the universe end?
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N2o3 hybridization?
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Write the chemical reaction showing comlete combustion of the organic substance formed in sodium hydroxide and chloroethane?
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What is the limit of #e^-x# as #x to oo # ?
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What is the derivative of #(3+2x)^(1/2)#?
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What are the units used to measure pressure?
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Is #f(x)=-4x^3+4x^2+2x-1# increasing or decreasing at #x=2#?
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Please help with this question on functions?
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Two charges #+1*10^-6# and #-4*10^-6# are separatd by a distance of 2 m. Where is the null point located?
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The pH of aquous 0.10M pyridine (C6H5N) ion is 9.09. What is the Kb for this base?