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MTEL Chemistry (67) Practice Tests & Test Prep by Exam Edge

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MTEL Chemistry Sample Test

1 of 5

When referring to ionic compounds, which of the following statements is true?

I. The positive charge of the molecule must be equal to the negative charge for the molecule to be neutral.

II. Ionic compounds are held together by electrostatic force between ions.

III. An ionic compound will feature exclusively ionic bonds.

Correct Answer:

i and ii.

the correct answer to the question about the characteristics of ionic compounds is "i and ii." let's expand on the reasoning behind each statement.

i. "the positive charge of the molecule must be equal to the negative charge for the molecule to be neutral." this statement is true. ionic compounds are formed when atoms transfer electrons from one to another, typically between a metal and a non-metal. the metal loses electrons to become a positively charged ion (cation), while the non-metal gains these electrons to become a negatively charged ion (anion). for the compound to remain electrically neutral, the total positive charge of the cations must balance the total negative charge of the anions. this balance of charge ensures that the compound as a whole does not carry any net electric charge.

ii. "ionic compounds are held together by electrostatic force between ions." this statement is also true. the fundamental force holding ionic compounds together is the electrostatic force of attraction between oppositely charged ions. this kind of chemical bond is known as an ionic bond. the strength of this attraction is what gives ionic compounds their characteristic high melting and boiling points.

iii. "an ionic compound will feature exclusively ionic bonds." this statement is not entirely true and hence makes options involving only iii incorrect. while the primary bonding in ionic compounds is ionic due to the transfer of electrons and the resulting electrostatic attraction, there can be instances where some covalent character is also present in ionic compounds. this occurs due to the polarizing power of the cation or the polarizability of the anion, which can lead to some degree of electron sharing between the ions. additionally, in complex ionic compounds, there can be coordination sites where more directional covalent bonding occurs. thus, saying that an ionic compound features exclusively ionic bonds oversimplifies the real structure and bonding in these compounds.

in conclusion, statements i and ii accurately describe fundamental and broadly applicable aspects of ionic compounds, making them true. statement iii does not universally apply to all ionic compounds due to the occasional presence of covalent character, making the combination of "i and ii" the correct answer to the question.