Unit 7 Exam Flashcards
When one atom contributes both bonding electrons in a single covalent bond, the bond is called a(n) __________:
Coordinate covalent bond
The shape of the methane molecule (CH4) is called _______:
Tetrahedral
Which elements can form diatomic molecules joined by a single covalent bond?:
Hydrogen and halogens
Experimental evidence suggests that the H-C-H bond angles in ethene, C2H4, are ______ degrees:
120
A bond that is not symmetrical along the axis between two atomic nuclei is a(n) _____ bond:
Pi
How many electrons can occupy a single molecular orbital?:
2
According to the VSEPR theory, molecules adjust their shapes to keep _____ as far apart as possible:
electrons
What is the shape of a molecule with the formula AB4?
tetrahedral
A bond formed between a silicon atom and an oxygen atom is likely to be a(n) _____ bond:
Polar covalent
Which of the following diatomic molecules is joined by a double covalent bond?:
•H2
•Cl2
•N2
•O2O2
Draw the Lewis Structures of the following. Identify their shape, bond angle, polarity, partial charges:
SO3^2-
look in class downloads and docs folder
Which of these elements does not exist as a diatomic molecule?:
•Ar
•Br
•I
•ClAr
Which of the following covalent bonds is the most polar?:
•H-H
•H-O
•N-S
•H-FN-S
What is thought to cause the dispersion forces?:
The movement of electrons
What are the weakest attractions between molecules called?:
Dispersion forces, London dispersion forces, and Van Der Waals forces
Which of the following concerning carbon tetraiodide is correct?:
•Tetrahedral, 109.5, nonpolar
•Tetrahedral, 109.5, polar
•Trigonal pyramidal, 107, nonpolar
•Bent, 104.5, nonpolarTetrahedral, 109.5, nonpolar
What is the shape of a tri-atomic molecule with a triple bond?:
Linear
Which of the forces of molecular attraction is the weakest?:
Van der Waals forces
What is the name given to pairs of valence electrons that do not participate in bonding in diatomic oxygen molecules?:
Lone pairs
How many covalent bonds are in a covalently bonded molecule containing 1 phosphorus atom and 3 chlorine atoms?:
3
What is the bond angle in a water molecule?:
104.5
Draw the Lewis Structures of the following. Identify their shape, bond angle, polarity, partial charges:
SO3
check class download and docs folder
How many unshared pairs of electrons are in a molecule of hydroiodic acid?:
3
How many sigma bonds are there in a molecule of carbon dioxide?:
2
