Ionic Compounds and Charges

The video tutorial explains how to write the chemical formula for potassium sulfide. It begins by identifying potassium and sulfur on the periodic table, noting their respective charges. The tutorial then explains the concept of ionic compounds and the importance of balancing charges to achieve a net charge of zero. The crisscross method is introduced as a way to verify the formula, resulting in K2S as the correct formula for potassium sulfide. The video concludes with a brief summary and thanks to the viewers.

What is the symbol for potassium on the periodic table?

• P

• K

• Pt

• Po

Which group does sulfur belong to on the periodic table?

• Group 7A

• Group 2

• Group 6A

• Group 1

What is the ionic charge of potassium?

• -1

• -2

• +2

• +1

Why do we need to balance the charges in an ionic compound?

• To make it more reactive

• To achieve a net charge of zero

• To increase its mass

• To change its color

What is the correct formula for potassium sulfide after balancing the charges?

• K2S2

• K2S

• KS2

• KS

In the crisscross method, what do you do with the charge numbers?

• Add them together

• Subtract them

• Ignore them

• Use them as subscripts

What is the purpose of the crisscross method?

• To find the atomic mass

• To calculate the molar mass

• To quickly verify the chemical formula

• To determine the element's state

What is inferred when using the crisscross method for a charge of 1?

• It is written as a subscript

• It is ignored

• It is doubled

• It is added to the other charge