Chemical Properties of Sodium and Thiocyanate

The video tutorial explains how to write the chemical formula for sodium thiocyanate. It begins by identifying the element symbols for sodium (Na) and the polyatomic ion thiocyanate (SCN). The tutorial highlights the importance of understanding polyatomic ions and their charges, noting that the thiocyanate ion has a charge of one minus. To ensure the compound is neutral, the video explains how the positive charge of sodium (one plus) balances with the negative charge of thiocyanate. The final formula for sodium thiocyanate is presented as NaSCN.

What is the chemical symbol for sodium?

• Sc

• Sn

• Na

• S

Which of the following is a polyatomic ion?

• O

• SCN

• Cl

• Na

What is the ionic charge of the thiocyanate ion?

• 2-

• 2+

• 1+

• 1-

How do the charges of sodium and thiocyanate ions balance in sodium thiocyanate?

• 1+ and 2-

• 2+ and 1-

• 2+ and 2-

• 1+ and 1-

What is the correct formula for sodium thiocyanate?

• NaS

• SCNNa

• NaSCN

• NaSC