Question

unit 2 hw, part 2: mcq. remember to log your responses on my ap. it doesn’t matter what you score, but this task is a part of this hw assignment, worth 5 pt.

1. on the basis of electronegativity differences between atoms, which of the following scientific claims is the most accurate regarding the bonding in mg(no₃)₂(s) ?

a. there is polar covalent bonding between mg atoms and n atoms.
b. there is polar covalent bonding between mg atoms and o atoms.
c. there is ionic bonding between n⁵⁺ ions and o²⁻ ions.
d. there is ionic bonding between mg²⁺ ions and no₃⁻ ions.

1. which of the following claims about a binary compound in which the bonding is ionic is most likely to be scientifically valid?

a. both elements in the compound are metals.
b. the atomic masses of the elements in the compound are relatively small.
c. there is equal sharing of electrons between the atoms of the elements in the compound.
d. the electronegativity difference between the elements in the compound is relatively large.

1. which of the following claims about a binary compound composed of elements with the same electronegativity is most likely to be true?

a. the compound has properties similar to those of both elements.
b. the bonding in the compound is nonpolar covalent.
c. the boiling point of the compound is above 1000°c.
d. the compound contains strong ionic bonds.
image of na⁺ and cl⁻ ions

1. molten (liquid) nacl is represented by the particulate diagram shown above. which of the following indicates whether nacl(l) conducts electricity and best explains why or why not?

a. it conducts electricity because na is a metal.
b. it conducts electricity because ions are free to move.
c. it does not conduct electricity because cl is a nonmetal.
d. it does not conduct electricity because there are no free electrons.
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Explanation:

Question 1

To determine the bonding in \( \text{Mg(NO}_3\text{)}_2 \), we analyze the components. \( \text{Mg(NO}_3\text{)}_2 \) consists of \( \text{Mg}^{2+} \) ions and \( \text{NO}_3^- \) ions. Ionic bonding occurs between a metal cation (\( \text{Mg}^{2+} \)) and a polyatomic anion (\( \text{NO}_3^- \)). Option A and B are incorrect as Mg forms ionic bonds with the nitrate ion, not polar covalent with N or O. Option C is incorrect as \( \text{NO}_3^- \) is a polyatomic ion, not \( \text{N}^{5+} \) and \( \text{O}^{2-} \) ions. Option D correctly identifies ionic bonding between \( \text{Mg}^{2+} \) and \( \text{NO}_3^- \).

Ionic bonding occurs when there is a large electronegativity difference between elements (usually a metal and a non - metal). Option A is wrong because two metals form metallic bonds, not ionic. Option B is incorrect as atomic mass is not related to ionic bonding. Option C is wrong because equal sharing of electrons is characteristic of non - polar covalent bonding, not ionic. Option D is correct as a large electronegativity difference is typical for ionic bonding.

If two elements have the same electronegativity, the bonding between them is non - polar covalent (since there is no electronegativity difference to cause polarity in the bond). Option A is wrong as a compound's properties are different from its constituent elements. Option C is incorrect as non - polar covalent compounds generally have low boiling points (not above \( 1000^{\circ}\text{C} \)). Option D is wrong as ionic bonds require a significant electronegativity difference, which is not present here. Option B is correct.

Answer:

D. There is ionic bonding between \( \text{Mg}^{2+} \) ions and \( \text{NO}_3^- \) ions.

Question 2