Hydrofluoric Acid Composition and Properties

The video tutorial explains how to write the chemical formula for hydrofluoric acid. It begins by identifying the acid's name, which starts with 'hydro', indicating the presence of hydrogen. The tutorial then identifies the element fluorine from the periodic table, represented by the symbol 'F'. The formula 'HF' is formed by combining hydrogen and fluorine. The video further explains the importance of balancing charges, noting that hydrogen has a +1 charge and fluorine has a -1 charge, resulting in a net charge of zero. This balance confirms that 'HF' is the correct formula for hydrofluoric acid.

What is the first step in writing the formula for hydrofluoric acid?

• Identify the prefix 'hydro' and write 'H'.

• Find the element 'fluorine' on the periodic table.

• Balance the charges between hydrogen and fluorine.

• Determine the net charge of the compound.

Which element corresponds to the stem 'fluor' in hydrofluoric acid?

• Nitrogen

• Fluorine

• Hydrogen

• Oxygen

What is the symbol for fluorine on the periodic table?

• Fe

• H

• F

• Fl

Why is it important to balance the charges in hydrofluoric acid?

• To change the compound's color.

• To increase the compound's acidity.

• To make the compound more reactive.

• To ensure the compound is stable.

What is the net charge of hydrofluoric acid when the charges are balanced?

• Positive two

• Negative one

• Positive one

• Zero