What is the total number of electrons an atom of hydrogen can have in its valence shell? Select the correct answer below: 1 2 5 8
Free radicals do NOT have: Select all that apply: all their electrons paired valence electrons an odd number of electrons an unpaired electron
Which of the following elements can NOT form hypervalent molecules? (select all that apply) Select all that apply: N S Br B
When drawing a Lewis structure for a free radical, which type of atom is more likely to receive the unpaired electron? Select the correct answer below: the more electronegative element the less electronegative element the heavier element the lighter element
Hypervalent molecules require that central atoms access: Select the correct answer below: s orbitals p orbitals d orbitals all of the above
Resonance forms differ in: Select the correct answer below: mass of compound atoms orbital diagrams of atoms arrangement of electrons all of the above
Which of the following best explains what resonance structures are? Select the correct answer below: A molecule whose Lewis structure could be described by more than one resonance structure possesses an electronic structure equal to that of the most stable resonance form. A molecule whose Lewis structure could be described by more than one resonance structure possesses an electronic structure equal to that of a combination of the resonance structures, with the more stable structures contributing more to the average structure. A molecule whose Lewis structure could be described by more than one resonance structure possesses an electronic structure that fluctuates between the possible structures over time. A molecule whose Lewis structure could be described by more than one resonance structure could have any of the different resonance structures. Each different resonance is a different compound.
Typically an oxygen atom with covalent bond will have a formal charge of -1. Select the correct answer below: 1 2 3 4
Shown below are two structures of boron trifluoride, with formal charges indicated and lone pairs omitted for clarity. Which is the more likely structure? Select the correct answer below: The structure on the left The structure on the right Both structures are equally likely These are not acceptable resonance structures of BF3
The best Lewis structure for carbon dioxide will have: Select the correct answer below: formally charged carbon formally charged oxygen formally charged carbon and oxygen all neutral atoms
Typically if nitrogen has a formal positive charge, it is participating in covalent bond(s). Report your answer as a whole number without any decimal places. Provide your answer below:
What is the formal charge of the atom labeled A in the image? Report your answer as an integer without any decimal places. Provide your answer below:
What is the charge on the oxygen atom in carbon monoxide? Select the correct answer below: 1− 0 1+ 2+
Which of the following characteristics would be preferred for a better resonance structure? Select the correct answer below: minimal formal charges maximized bond strength negative formal charges on the most electronegative atom all of the above
Which of the following is true? Select the correct answer below: If the Lewis structure must have nonzero formal charges, the arrangement with the smallest nonzero formal charges is preferable. A molecular structure in which all formal charges are zero is preferable to one in which some formal charges are not zero. Lewis structures are preferable when adjacent formal charges are zero or of the opposite sign. All of the above
What will be the formal charge on the most central atom of SCN− in it's most likely structure? Provide your answer below:
A sample of water is suspected to contain silver ions. What can be done to support this claim? Select the correct answer below: Add HCl to see if a precipitate forms. Acidify the solution and add H2S to see if a precipitate forms. Basify the solution and add H2S to see if a precipitate forms. Add (NH4)2HPO4 and NH3 to the solution to see if a precipitate forms.
Why are ionic solids poor electrical conductors in the solid state? Select the correct answer below: They are made of nonmetals, and nonmetals are poor conductors. Gravity keeps the ions apart. Strong electrostatic attractions between ions keep them held in place. The high electron affinity of nonmetals keeps the electrons from moving.