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Which of the following is an INCORRECT description of benzene?
a. The CCC bond angles are all equal to 120 ob. The 6-membered ring contains alternating double and single carbon-carbon bondsc. The molecule may be drawn as resonance hybrid of 2 Kekule structuresd. The molecule is planar
Which of the following criteria is NOT used to determine if a molecule is aromatic?
a. Structure is cyclicb.Each carbon atom in the ring has sp3 hybridizationc.Structure is planar or nearly sod.The pi network contains 4N +2 electrons
Which of the following numbers of pi electrons would not lead to aromaticity?
a. 2b. 6c. 8d. 10
The compound cyclobutadiene would be best catagorized as
a. anti-aromaticb. non-aromaticc. aromaticd. none of the above
Which of the following is also an acceptable name for 3-nitrophenol?
a. o-nitrophenolb. m-nitrophenolc. p-nitrophenold. none of the above
The simplest formula of a substance is found to be CH2O, and its approximate molar mass is found by experiment to be 93 g•mol-1. What is its exact molar mass?
A piece of a newly synthesized material of mass 25.0 g at 80.0C is placed in a calorimeter containing 100.0 g of water at 20.0C. If the final temperature of the system is 24 0C
Chemistry: Change in Temperature in the Production of Silver Chloride, When solutions containing silver ions and chloride ions are mixed, silver chloride precipitates:
A volume of 95.0 ml of H2O is initially at room temperature (22.0 C). A chilled steel rod at 2.00 C is placed in the water. If the final temperature of the system is 21.1 C .
Compute delta Hf for CaC2 : CaC2 + 2H2O-->Ca(OH)2 +C2H2 From the given enthalpy of reaction data as water(H2O) =(2*-285.83),calcium hydroxide Ca(OH)2=(-986.2) , AcetyleneC2H2 =(226.77)?
Determine the mass, of: a.30.0 mL of the liquid propylene glycol, a moisturizing agent for foods,
If the volumes in the buret and the flask are identical and the concentration of the acid in the buret is 0.250 M, what is the concentration of the base in the flask.
Calculate the [Cr+3] in equilibrium with Cr(OH)4-(aq) when 0.010 mol of Cr(NO3)3 is dissolved in a liter of solution buffered at a pH of 7.3. Kf for Cr(OH)4-(aq) is 8.0 x 1029.
How can grains in a silo spontaneously explode? How is it that corn or any other grain can explode in a silo on it's own? How could a natural gas leak just cause corn to explode in a silo?
A freeway has 10,000 vehicles per hour passing a house 200 m away. Each car emits an average of 1.5 g/mi of NOx, and winds are blowing at 2 m/s across the freeway towards the house.
1.248-g sample of limestone rock is pulverized and then treated with 30.00 mL of 1.035 M HCl solution. the excess acid then requires 11.56 mL of 1.010 M NaOH for neutralization.
A sample containing 2.40 {rm moles} neon gas has a volume of 8.00 {rm L}. Assume that the pressure and the temperature remain constant.
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