(a)
Interpretation:
The logic should be explained for the suggestion of similar structure of
Concept Introduction:
The electrons present in the outermost energy level or shell is known as valence electrons. These electrons are available for bonding and outermost shell is known as valence shell.
(b)
Interpretation:
The most symmetric pattern of carbon, boron and nitrogen atoms in
Concept Introduction:
Fullerene molecular formula:
Fullerene has 60 carbon atoms and its structure is arranged in a closed net having 12 pentagonal and 12 hexagonal faces to form cage like structure.
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Principles of Modern Chemistry
- 6. Which of the following structure(s) is/are chiral? Br Br Br 1 Br 2 Br Br 3 Br Br 4arrow_forwardSelect the bonds in the 3D representation of methyl urethane below that are multiple bonds. (Hint: Consider the number of bonds attached to an atom in the image compared to the normal valence of that atom. In a valid structure, the number of bonds to an atom will equal the valence of that atom.) • Gray = C: white = H; red = 0; blue = N; dark green = Cl; brown = Br; light green = F; purple = 1; yellow = S: orange = P. • Double click to select bonds. You can zoom in and out using the mouse scroll wheel (or pinch to zoom on touch screens). ●arrow_forwardA particular allotrope of nitrogen, N4, was first detected in 2002. (Allotrope just means a chemical form in which an element can exist. Oxygen, for example, has two allotropes on earth: O2 and O3.) The all-nitrogen compound only lasts a short while before breaking down to N2. The compound cannot be isolated, so its structure is not yet confirmed experimentally; we can only hypothesize what its bonding and shape are. This allotrope is generally believed to be either a single ring of four nitrogens or a single chain of four nitrogens. 1. Draw the Lewis structure for both the linear form and the single ring form.arrow_forward
- Draw the Lewis structures and predict the hybridization (sp, sp2, sp3), geometry (linear, trigonal, tetrahedral), and bond angles (180°, 120°, 109.5°) for the central atoms in the following compounds. C and N in C CH3CNarrow_forwardA particular allotrope of nitrogen, N4, was first detected in 2002. (Allotrope just means a chemical form in which an element can exist. Oxygen, for example, has two allotropes on earth: O2 and O3.) The all-nitrogen compound only lasts a short while before breaking down to N2. The compound cannot be isolated, so its structure is not yet confirmed experimentally; we can only hypothesize what its bonding and shape are. This allotrope is generally believed to be either a single ring of four nitrogens or a single chain of four nitrogens. 2. Assign formal charges to each atom in both structures. Which structure is more likely someday to be confirmed experimentally?arrow_forwardWhat exactly is meant by the term "homogeneous structure"?arrow_forward
- 2a) The molecule ethene (or ethylene), which has the molecular formula C₂H4, contains two carbon atoms with planar geometry. Construct a model of ethene by first connecting two black balls with two springs. Use four short sticks and four yellow balls to complete the structure. Sketch a perspective representation (a three dimensional drawing) of the structure. 2b) What is the C=C-H bond angle in ethene?arrow_forwardQ5. In the calcium fluorite CaF2 structure, atoms occupy the position of 3/4 3/4 3/4, which is not filled in the so-called zinc blende (ZnS) structure. That is, Ca occupies the positions of 000, 12/20, 0/2/2, 1/2012 and F occupies the positions of 141414,3/43/4/4, 1/43/43/4, 3/41/43/4, 3/43/43/4, 1/41/43/4, 3/4/4/4, 1/43/4/4. (1) Obtain the structure factor Fhkl of CaF2 and also express it using the structure factor F (fcc)of a face-centered cubic lattice. (2) Determine the plane indices for which the diffracted intensity can and cannot be observed.arrow_forwardThere are seven possible dichloropropene isomers (molecular formula C3H4Cl2). Draw their structures and name each isomer. (Hint: Don't over-look cis-trans isomers.)arrow_forward
- Explain the types of bonds present in the compound Al2(CH3)6arrow_forwardQuestion 9 Of the choices below, choose the LARGEST set that contains ONLY sp2 hybridized atoms? H₂N 2 H₂C 5110 H 10 11 7 CH₂ 12 15 H 5, 9, 19 5, 7, 12, 14 5, 7, 12, 14 and 19 1, 5, 7, 12, 14 and 19 O H₂C H 13 17 20=69 16 C 19 18 OH 21 Question 10 ( What question in protein folding did Pauling's discovery of secondary structure address? Both alpha-helices and beta-sheets are very stable structures because of the phi-psi conformation of peptide main chain. O Alpha-helices and beta-sheets are often the first structures formed in protein folding, and they act as the folding nucleus. Alpha-helices and beta-sheets show how a folded protein can satisfy the polar groups of the peptide main chain through hydrogen bonding. Because alpha-helices and beta-sheets are such stable structures, they explained the why folding was a spontaneous reaction.arrow_forwardCH4 is non-polar. Why?arrow_forward
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