Question 1 (10 points) A chemical formula provides information regarding the geo

Question

Question 1 (10 points)

A chemical formula provides information regarding the geometry of a molecule as well as the ratio of the atoms in a molecule.

Question 1 options:

Question 2 (10 points)

Lewis structures provide an information about the geometry of the molecules.

Question 2 options:

Question 3 (10 points)

To draw a Lewis structure, you need to calculate the number of valence electrons.

Question 3 options:

Question 4 (10 points)

The position of formal charges is indicated in a Lewis structure.

Question 4 options:

Question 5 (10 points)

A covalent bond can be:

Question 5 options:

single

double

triple

all of the above

Question 6 (10 points)

Carbon has 4 valence electrons.

Question 6 options:

Question 7 (10 points)

Nitrogen, phosphorus and arsenic have 5 valence electrons.

Question 7 options:

Question 8 (10 points)

Nitrogen can violate the octet rule by having more than an octet but phosphorus cannot.

Question 8 options:

Question 9 (10 points)

If a molecule has a 2 negative formal charges and one positive formal charge, then the overall molecule is:

Question 9 options:

neutral

a cation

an anion

none of the above

Question 10 (10 points)

In drawing Lewis structures, a single line (single bond) between two atoms represents:

Question 10 options:

a shared pair of electrons

a lone pair of electrons

an octet of electrons

valence electrons

Explanation / Answer

Question 1: A chemical formula provides information regarding the geometry of a molecule as well as the ratio of the atoms in a molecule.

Answer: False. A chemical formula doesn’t provide information regarding the geometry of a molecule for all compounds as a general rule but it does provide information regarding the ratio of the atoms in a molecule.

Question 2: Lewis structures provide an information about the geometry of the molecules.

Answer: False. Lewis structures provide information only about the valence electrons and lone pair electrons in a molecule.

Question 3: To draw a Lewis structure, you need to calculate the number of valence electrons.

Answer: True.

Question 4: The position of formal charges is indicated in a Lewis structure.

Answer: True.

Question 5: A covalent bond can be:

Option: all of the above. A covalent bond can be single, double or triple.

Question 6: Carbon has 4 valence electrons.

Answer: True. Carbon atom no: 6 and its configuration is 1s2, 2s2, 2p2. Thus the valence shell (2s2, 2p2) has 4 valence electrons.

Question 7: Nitrogen, phosphorus and arsenic have 5 valence electrons.

Answer: True. Nitrogen, phosphorus and arsenic belong to 5th group in periodic table.

Question 8: Nitrogen can violate the octet rule by having more than an octet but phosphorus cannot.

Answer: False. Phosphorus can violate the octet rule by having more than an octet but Nitrogen cannot as it doesn’t have d orbital.

Question 9: If a molecule has a 2 negative formal charges and one positive formal charge, then the overall molecule is:

Answer: an anion, e.g. nitrate anion

Question 10: In drawing Lewis structures, a single line (single bond) between two atoms represents:

Answer: a shared pair of electrons

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