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What is the scientific method? What is the interrelationship between scientific hypotheses, laws and theories? Why is critical thinking essential to scientific research?
the enthalpy of fusion of methanol is 3.16 kjmol. how much heat would be absorbed or released upon freezing 25.6 grams
Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is: 2C4H10(g)+13O2(g) -> 8CO2(g)+ 10H2O(l)
Calculate the lattice energy for LiF(s) given the following; sublimation energy for Li(s) +166KJ/mol, ?Hf for F(g) +77KJ/mol, first ionization energy of Li(g) +520KJ/mol, electron affinity of F(g) -328KJ/mol, enthalpy of formation of LiF(s) -617KJ..
Problem- Nutritional tables give the potassium content of a standard apple as 159 mg. There are about 3 apples/Ib. How many grams of potassium are in 40.36 kg of apples
Hexacoordinate Fe (II) in heme is bright red. Pentacoordinate Fe (II) is blue. Define how these electronic changes account for the difference in colors of arterial and venous blood
What volume of 0.25 M HNO3 (aq) reacts with 4.8 ml of 0.150 M Na2CO3 (aq) when the two solutions are mixed?please show work step by step.
If flask B were smaller than flask A, would the final pressure after the stopcock is opened be greater than, equal to, or less than 0.5 atm
What is the hydronium ion concentration of a 0.500 M acetic acid solution with Ka = 1.8 x 10-5. The equation for the dissociation of acetic acid is: CH3CO2H(aq) + H2O(l) H3O+(aq) + CH3CO2-(aq)
Atmospheric pressure yesterday was given as 0.875 atm. Express this pressure in units of torr as well as also in kilopascals (kPa) respectively.
Calculate final pH resulting from the addition of 5.0 mmol of strong acid to the buffer solution made from 0.150 L of 0.50 M NH4Cl and 0.100 L of 0.25 M NaOH. pKa(NH4+)=9.25.
At what pH must solutions of nickel (II) ions be maintained in order to prevent precipitation of the hydroxide
How could you synthesize ethyl-(E, E)-5-phenyl-2, 4-pentadieneoate via a Wittig reaction, using benzaldehyde as your carbonyl compound and any other necessary organic or inorganic reagents
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