General Chemistry CH115

Determine enthalpy (in kJ) for this reaction, using the given average bond energies.

Answer explanation

839 + 432 × 2 - 347 - 413 × 4

• tetrahedral, tetrahedral, trigonal planar, linear.

• trigonal pyramidal, tetrahedral, trigonal planar, bent.

• trigonal pyramidal, tetrahedral, trigonal planar, linear.

• tetrahedral, pyramidal, tetrahedral, trigonal planar, bent.

Identify the circled functional groups (B and C)

• ketone, aldehyde

• ether, aldehyde

• ketone, carboxylic acid

• ether, carboxylic acid

• aldehyde, carboxylic acid

Complete the Lewis structure of CO2. What is the bond order of the C-O bond?

O C O

Formal charge = #valence e - #assigned e

• -2, 0, 1

• 0, 0, -1

• -1, 0, 0

• 0, 0, 0

• 0, -1, 0

What is the electron group arrangement and the local (molecular) geometry of the circled carbon in the given structure?

Hint: lone pairs of electrons havee been omitted.

• trigonal planar, trigonal pyramidal

• trigonal planar, tetrahedral

• trigonal planar, trigonal planar

• tetrahedral, trigonal pyramidal

β-carotene (given structure) is a precursor (inactive form) to vitamin A. How many π bond are there in the structure?

What is the hydridization of the central atom in the molecule PF3?

• sp

• sp2

• sp3

• sp3d

• sp3d2

The number of atoms in a 11.2 g piece of iron (Fe) metal is

............×10²³

Please fill the letter that marks your choice (A, B, C, D or E)