Question

aui is a chemical compound.

a. is this an ionic or covalent compound?
explain how you can tell based on the types of elements it contains.

b. how do you determine the name of this compound?
describe the steps you used and write the correct name.

question 10 (2 points)
state whether this is an ionic or covalent compound and then explain how you would determine the formula:

ammonium nitrate

Explanation:

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<reasoning>

Identify compound type for AuI

Using the Ionic Bonding and Covalent Bonding knowledge points

• Gold (\(\text{Au}\)) is a transition metal.
• Iodine (\(\text{I}\)) is a nonmetal halogen.
• A metal combined with a nonmetal forms an ionic compound.

Determine the name of AuI

Using the Chemical Nomenclature knowledge point

• Gold is a transition metal that can form multiple charges, specifically \(\text{Au}^+\) or \(\text{Au}^{3+}\).
• Iodine forms a monoatomic iodide anion with a \(1-\) charge (\(\text{I}^-\)).
• Since the formula is \(\text{AuI}\) (1:1 ratio), gold must have a \(1+\) charge to balance the \(1-\) charge of iodide.
• The correct name is gold(I) iodide.

Analyze ammonium nitrate

Using the Ionic Bonding and Chemical Nomenclature knowledge points

• Ammonium (\(\text{NH}_4^+\)) and nitrate (\(\text{NO}_3^-\)) are both polyatomic ions.
• Since it is composed of oppositely charged polyatomic ions, it is an ionic compound.
• The formula is determined by balancing the \(1+\) charge of ammonium with the \(1-\) charge of nitrate, yielding \(\text{NH}_4\text{NO}_3\).

</reasoning>

<answer>

Question A

This is an ionic compound. Gold (\(\text{Au}\)) is a metal and iodine (\(\text{I}\)) is a nonmetal; compounds formed between metals and nonmetals are ionic.

Question B

To determine the name:

1. Identify the cation as gold (\(\text{Au}\)) and the anion as iodide (\(\text{I}^-\)).
2. Since gold is a transition metal that can have multiple oxidation states, determine its charge from the anion. Iodide has a \(1-\) charge, so gold must have a \(1+\) charge to balance it.
3. Write the name with the metal's charge in Roman numerals: gold(I) iodide.

Question 10

Ammonium nitrate is an ionic compound. It is composed of the polyatomic ammonium cation (\(\text{NH}_4^+\)) and the polyatomic nitrate anion (\(\text{NO}_3^-\)). Because the \(1+\) charge of ammonium balances the \(1-\) charge of nitrate in a 1:1 ratio, the chemical formula is \(\text{NH}_4\text{NO}_3\).
</answer>

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Answer:

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<reasoning>

Identify compound type for AuI

Using the Ionic Bonding and Covalent Bonding knowledge points

• Gold (\(\text{Au}\)) is a transition metal.
• Iodine (\(\text{I}\)) is a nonmetal halogen.
• A metal combined with a nonmetal forms an ionic compound.

Determine the name of AuI

Using the Chemical Nomenclature knowledge point

• Gold is a transition metal that can form multiple charges, specifically \(\text{Au}^+\) or \(\text{Au}^{3+}\).
• Iodine forms a monoatomic iodide anion with a \(1-\) charge (\(\text{I}^-\)).
• Since the formula is \(\text{AuI}\) (1:1 ratio), gold must have a \(1+\) charge to balance the \(1-\) charge of iodide.
• The correct name is gold(I) iodide.

Analyze ammonium nitrate

Using the Ionic Bonding and Chemical Nomenclature knowledge points

• Ammonium (\(\text{NH}_4^+\)) and nitrate (\(\text{NO}_3^-\)) are both polyatomic ions.
• Since it is composed of oppositely charged polyatomic ions, it is an ionic compound.
• The formula is determined by balancing the \(1+\) charge of ammonium with the \(1-\) charge of nitrate, yielding \(\text{NH}_4\text{NO}_3\).

</reasoning>

<answer>

Question A

This is an ionic compound. Gold (\(\text{Au}\)) is a metal and iodine (\(\text{I}\)) is a nonmetal; compounds formed between metals and nonmetals are ionic.

Question B

To determine the name:

1. Identify the cation as gold (\(\text{Au}\)) and the anion as iodide (\(\text{I}^-\)).
2. Since gold is a transition metal that can have multiple oxidation states, determine its charge from the anion. Iodide has a \(1-\) charge, so gold must have a \(1+\) charge to balance it.
3. Write the name with the metal's charge in Roman numerals: gold(I) iodide.

Question 10

Ammonium nitrate is an ionic compound. It is composed of the polyatomic ammonium cation (\(\text{NH}_4^+\)) and the polyatomic nitrate anion (\(\text{NO}_3^-\)). Because the \(1+\) charge of ammonium balances the \(1-\) charge of nitrate in a 1:1 ratio, the chemical formula is \(\text{NH}_4\text{NO}_3\).
</answer>

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