Hydrogen and Chromate Ions Concepts

The video tutorial explains how to write the formula for chromic acid. It begins by identifying the components of the acid, noting the absence of a 'hydro' prefix, which indicates the presence of more than two elements. The tutorial then focuses on the chromate ion, using a polyatomic ion table to find its formula. The final step involves balancing the charges to complete the formula for chromic acid, resulting in H2CrO4.

What is typically found at the beginning of an acid's chemical formula?

• Carbon

• Hydrogen

• Oxygen

• Nitrogen

What does the absence of 'hydro' in the name of an acid suggest?

• Presence of a noble gas

• Presence of more than two elements

• Presence of a metal

• Presence of a single element

How do you modify the stem 'chrome' to form the chromate ion?

• Add 'ate'

• Add 'ide'

• Add 'ous'

• Add 'ite'

Where can you find the formula for the chromate ion?

• Elemental chart

• Molecular weight chart

• Polyatomic ion table

• Periodic table

What is the charge of the chromate ion?

• 4-

• 1-

• 2-

• 3-

What is the chemical formula for chromic acid?

• HCrO4

• HCrO3

• H2CrO4

• H2Cr2O7

How many hydrogen ions are needed to balance the charge of the chromate ion?

• Two

• Four

• Three

• One

What is the charge of a hydrogen ion?

• 1+

• 2+

• 2-

• 1-

Which group on the periodic table does hydrogen belong to?

• Group 16

• Group 17

• Group 2

• Group 1

What is the purpose of balancing charges in a chemical formula?

• To increase reactivity

• To alter the state

• To ensure stability

• To change the color