Question

question 9 (2 points)
(03.04 mc)
what best describes the bonding in a silicon dioxide molecule?
o a a silicon atom transfers an electron to each oxygen atom.
o b a silicon atom receives two electrons from each oxygen atom.
o c a silicon atom shares one electron pair with each oxygen atom.
o d a silicon atom shares two electron pairs with each oxygen atom.

question 10 (2 points)
(03.04 lc)
if a molecule has a single bond, what can be assumed about the bond compared to a molecule with a double bond?
o a the length is more than a double bond
o b the strength is more than a double bond
o c the strength is the same as a double bond
o d the length is less than a double bond

question 11 (2 points)
(03.02 lc)
what does the second word in the name of a binary ionic compound represent?
o a the group 1 element
o b the negative ion
o c the positive ion
o d the metal

Explanation:

Question 9

Silicon dioxide (\(SiO_{2}\)) has covalent bonding. Silicon (\(Si\)) has 4 valence electrons. Each oxygen (\(O\)) has 6 valence electrons. Silicon shares two electron pairs with each oxygen atom to complete its octet. Option a and b describe ionic bonding (electron transfer/receiving), which is not the case for \(SiO_{2}\). Option c is incorrect as it's two electron pairs (double bond) not one.

Double bonds are shorter and stronger than single bonds. So, a single - bonded molecule will have a bond length more than a double - bonded molecule. Option b is wrong as single bonds are weaker. Option c is wrong as single and double bonds have different strengths. Option d is wrong as single bond length is more than double bond length.

In a binary ionic compound (e.g., \(NaCl\) - sodium chloride), the first word is the positive ion (metal, e.g., \(Na^{+}\)) and the second word is the negative ion (non - metal, e.g., \(Cl^{-}\)). Group 1 element is not a general representation. Positive ion is the first part. Metal is often the first part (but not always if polyatomic ions are involved, but in binary ionic compounds with a metal and non - metal, metal is first).

Answer:

d. A silicon atom shares two electron pairs with each oxygen atom.

Question 10