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How much longer, in inches, must the minimum length of a plane mirror be for a 6-ft 4-in be to see his complete head-to-toe image than for a 5-ft 2-in woman to do so?
How many kilojoules a) are required to raise the temperature of 33.4 g CH3CH2OH(l) from 19.6 to 49.8 C b) must be removed from a 325 g sample of CH3(CH2)6CH3(l) to lower the samples temperature from 82.4 to 31.6
What is resonance energy? Explain taking the example of benzene. What do you understand by para-directing activators, para-directing deactivators and meta-directing deactivators?
A 706 mL gas sample at STP is compressed to a volume of 248 mL, and the temperature is increased to 39?C. What is the new pressure of the gas in Pa.
If 30.0mL of 0.250 M calcium nitrate is added to 1.25g of potassium phosphate, explain what is the mass (in grams) of the resulting calcium phosphate precipitate
An acetate acetic acid buffer has a pH = 5.00, containing 0.100 M NaOAc. Calculate the pH of the solution after adding 10 mL of 0.10 M NaOH to 100 mL of this buffer.
What happens to the pattern if we try to determine which slit the electron goes through by using a laser placed directly behind the slits
A 43.0 g sample of ethylene glycol, HOCH2CH2OH, is dissolved in 540.0 g of water. The vapor pressure of water at 32°C is 35.7 mm Hg. What is the vapor pressure of the water-ethylene glycol solution at 32°C ?
The activation energy of a certain reaction if 65.7kJ/mol. How many times faster will the reaction occur at 50 degrees Celsius than at 0 degrees Celsius? State the assumptions you need to make in order to perform this calculation.
What is the speed of an electron ejected from a metallic surface, where the metal work function is 2.06 eV and the radiation is at the following wavelengths
Question- What volume of 10 M hydrogen peroxide must be brought to 50 mL final volume so that the absorbance at 240 nm in a 1 cm path cuvet is 1.37? Hydrogen peroxide absorbs at 240 nm with ? of 4.36 x 10-2 mM-1cm-1.
A solution is 0.1 mM in NaF, Na2CO3, and Na3PO4. What would be the order of precipitation as a source of Ca2+ is added gradually to the solution? The relevant Ksp values are Ksp [CaF2] = 4.0×10-11, Ksp[CaCO3] = 8.7×10-9, Ksp[Ca3(PO4)2] = 1.3×10-32..
Assume that the aluminum atoms can be represented as spheres, as shown in the drawing (Part C figure) . If each {rm Al} atom has a radius of 1.43 {rm AA}, what is the length of a side of the unit cell?
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