Question

2) Write the correct formula for each compound below that would form from combining

each pair of ions.
K¹+ and F¹- =
Mg ² + and C1¹- =
Al³+ and 0²- =

Answer 1

---- K¹+ and F¹- combine to form KF (Potassium Fluoride)

--- Mg ²+ and Cl¹- combine to form MgCl2 (Magnesium Chloride)

--- Al³+ and O²- combine to form Al2O3 (Aluminium Oxide)

Step-by-step explanation:

Answer 2

Answer:

1.
`\( KF \)`

2.
`\( MgCl_2 \)`

3.
`\( Al_2O_3 \)`

Step-by-step explanation:

To write the correct formula for each compound formed from combining the given pairs of ions, we need to ensure that the compound is electrically neutral. This means the positive and negative charges should cancel each other out.

1. K⁺ and F⁻

- Potassium ion (K⁺) has a charge of +1.

- Fluoride ion (F⁻) has a charge of -1.

- They can combine in a 1:1 ratio to form a neutral compound.

Formula:
`\( KF \)`

2. Mg²⁺ and Cl⁻

- Magnesium ion (Mg²⁺) has a charge of +2.

- Chloride ion (Cl⁻) has a charge of -1.

- To balance the charges, we need two chloride ions for every magnesium ion.

Formula:
`\( MgCl_2 \)`

3. Al³⁺ and O²⁻

- Aluminum ion (Al³⁺) has a charge of +3.

- Oxide ion (O²⁻) has a charge of -2.

- To balance the charges, we need two aluminum ions for every three oxide ions.

Formula:
`\( Al_2O_3 \)`

So, the compounds formed are:

1.
`\( KF \)`

2.
`\( MgCl_2 \)`

3.
`\( Al_2O_3 \)`