Questions: Question 10 ( 0.25 points) The only polyatomic cation is: NH4+ NO2+ NO3+ OH+ Question 11 ( 0.25 points) When writing formulas that include polyatomic ions, parenthesis are included when: one polyatomic ion is needed in a formula. a polyatomic ion is needed in a formula regardless of the quantity. more than a single polyatomic ion is needed in a formula.

Question 10 ( 0.25 points)
The only polyatomic cation is:
NH4+
NO2+
NO3+
OH+

Question 11 ( 0.25 points)
When writing formulas that include polyatomic ions, parenthesis are included when:
one polyatomic ion is needed in a formula.
a polyatomic ion is needed in a formula regardless of the quantity.
more than a single polyatomic ion is needed in a formula.

Transcript text: Question 10 ( 0.25 points) The only polyatomic cation is: $\mathrm{NH}_{4}{ }^{+}$ $\mathrm{NO}_{2}{ }^{+}$ $\mathrm{NO}_{3}{ }^{+}$ $\mathrm{OH}^{+}$ Question 11 ( 0.25 points) When writing formulas that include polyatomic ions, parenthesis are included when: one polyatomic ion is needed in a formula. a polyatomic ion is needed in a formula regardless of the quantity. more than a single polyatomic ion is needed in a formula.

Solution

Solution Steps

Step 1: Identify the Polyatomic Cation

A polyatomic cation is a positively charged ion composed of two or more atoms covalently bonded. Among the given options:

$\mathrm{NH}_{4}{ }^{+}$ (Ammonium) is a well-known polyatomic cation.
$\mathrm{NO}_{2}{ }^{+}$, $\mathrm{NO}_{3}{ }^{+}$, and $\mathrm{OH}^{+}$ are not common polyatomic cations.

Final Answer for Question 10

$\boxed{\mathrm{NH}_{4}{ }^{+}}$

Step 2: Determine When to Use Parentheses in Formulas

Parentheses are used in chemical formulas to indicate that a polyatomic ion is present more than once in the compound. This helps to clarify the composition of the compound.

Final Answer for Question 11

$\boxed{\text{more than a single polyatomic ion is needed in a formula.}}$

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