Calcium and Hydride Ions Concepts

This video tutorial explains how to write the chemical formula for calcium hydride. It begins by identifying calcium as a metal and hydrogen as a hydride with a 1- charge. The tutorial discusses the ionic charges of calcium (2+) and hydrogen (1-) and how these charges balance to form a neutral compound. By using subscripts, the video demonstrates how to achieve a net charge of zero, resulting in the formula CaH2. The tutorial concludes with a summary of the process and the final formula.

What is the charge of a hydride ion when bonded to a metal?

• 1+

• 2+

• 1-

• 2-

Which group on the periodic table does calcium belong to?

• Group 1

• Group 2

• Group 3

• Group 4

What is the ionic charge of calcium?

• 2-

• 1+

• 2+

• 1-

How many hydride ions are needed to balance the charge of one calcium ion?

• Four

• Three

• Two

• One

What is the chemical formula for calcium hydride?

• CaH2

• CaH

• Ca2H2

• Ca2H

Why is a subscript of two used in the formula for calcium hydride?

• To indicate two calcium ions

• To represent two molecules of calcium hydride

• To balance the charge of two hydride ions

• To show two hydrogen atoms