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What is the total number of valence electrons in the hydrogen oxalate ion, HC2O4-?
All of the following molecules contain only single bonds except
How many resonance forms are required to represent the carbonate ion CO32-?
|E)||more than 4|
Draw a valid Lewis structure for SO2 and use it to deduce the sulfur-oxygen bond order in this compound.
Which contains a carbon with a negative formal charge, when represented by the most common electron-dot structure?
Which of the following has the lowest formal charge on the central atom, the first atom in the formula? (Assume that the electron-dot formula obeys the octet rule.)
Which of the following elements would you expect most likely to be a central atom with an expanded valence shell?
Why is the energy released upon the combustion of one mole of methane greater than that for one mole of methanol?
|A)||Because the amount of energy released is greater when smaller molecules are burned.|
|B)||Because methanol is more oxidized than methane and combustion is oxidation.|
|C)||Because methanol is a liquid and methane a gas at room temperature.|
|D)||Because the balanced reaction for methanol required 2 moles of methanol.|
|E)||None of the above.|
Estimate the standard enthalpy change ΔH° for the reaction below:
Data: Bond energies in kJ/mol: C-C, 348; C-H, 414; Cl-Cl, 242; C-Cl, 327; H-Cl, 431
Which of the following is not planar?
The shape of H3CF is best described as
In which of the following molecules and ions do the valence electron groups on the first atom in the formula have a trigonal bipyramidal geometry?
Which of the following is not tetrahedral in shape?
Use VSEPR theory to predict the ideal bond angles around the two carbon atoms in acetaldehyde, CH3CHO. (The first carbon has single bonds to three H atoms and one C atom; the second carbon has single bonds to C and H, and a double bond to O.)
Which of the following has the largest dipole moment?