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helium atoms do not combine to form He2 molecules, yet He atoms do attract one another weakly through? (a). dipole-dipole forces, (b). ion-dipole forces,(c). dispersion forces,(d). dipole-induced dipole forces, (e). hydrogen bonding.
The decomposition of 3.32 g CaCO3 yields 1.24 g CaO. What is the percent yield of this reaction? CaCO3(s) -> CaO(s) + CO2(g)
Some chemists believe that satisfaction of the octet rule should be the top criterion for choosing the dominant Lewis structure of a molecule or ion.
A sports beverage company is seeking an energy supplement to increase the performance of the athletes. An ongoing research project suggest the use of a tetrasaccharide with the following characteristics
Determine the ionization energy (in kilojoules per mole) of a metallic element if light of wavelength 67.2 nm ejects electrons with a speed of 2165 km/sec.
Calculate the heat evolved when 75.0 mL of a 2.00M HCl solution reacts with 37.5 mL of a 4.00M NaOH solution if the temperature rises from 20.0 degree C to 37.9 degree
A 6 cm string is fastened at both sides is plucked. What is the wavelength of the n = 3 standing wave? How many nodes does it contain.
Chemists often use molarity ,M in Moles/liter , to measure the concentration of solutions. Molarity is a common unit of concentration because the volume of a liquid is very easy to measure
If the cylinder then sits in the storage at 293 K for a long time, what is the entropy change of the universe (from the original unfilled state)?
mixture of 2-amino-propanoic has a specific rotatio of -5.6. What is the percent composition of the mixture of the specific rotation for the S enantiomer is +14.5
When radiation of a wavelength 2.45 x 10^-7 m falls on metal surface, the maximum kinetic energy of the emitted electrons is found to be 6.73 x 10^-19. What is the value in J of the work fuction of the metal
Chemical Structure and Hydrogen Bonds in Base Pairs, Draw the chemical structure of a correctly base paired G-C pair, then re-draw the pair with a propeller twist these answers should all be on one page following box 'G'
Determine the pH of the solution before the addition of any HNO3. The Kb of NH3 is 1.8 × 10-5. a. 4.74 b.9.26 c.11.13 d. 13.00 e.12.55
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