Oxidation Numbers and Nickel Hydride

The video tutorial explains the concept of oxidation numbers, focusing on the hydride ion (H-). It outlines general rules for determining oxidation numbers, such as the sum of oxidation numbers equaling the charge of the ion. The tutorial examines specific examples, including sodium hydride and nickel hydride, to illustrate how oxidation numbers are assigned in different compounds. The video emphasizes the consistent oxidation number of -1 for hydride ions when bonded to metals and explains how this affects the overall oxidation state of compounds.

What is the oxidation number of the hydride ion, H-?

• -1

• +2

• 0

• +1

What is the general rule for oxidation numbers in ions?

• They are always negative

• They add up to the charge of the ion

• They are always positive

• They add up to zero

In a neutral molecule, what should the sum of oxidation numbers equal?

• The charge of the ion

• Zero

• The atomic number

• The mass number

What is the oxidation number of sodium in sodium hydride?

• +2

• +1

• 0

• -1

Which group of elements typically has a +1 oxidation number?

• Group 4

• Group 2

• Group 1

• Group 3

In nickel hydride, what is the oxidation number of hydrogen when bonded to metals?

• +1

• -1

• 0

• +2

If the oxidation number of hydrogen in nickel hydride is -1, what must be the oxidation number of nickel to balance the molecule?

• 0

• +2

• +1

• -2

Which of the following is a common use for nickel hydride?

• Construction

• Cooking

• Batteries

• Fuel for cars

What is the significance of oxidation numbers in chemical compounds?

• They determine the color of the compound

• They help in balancing chemical equations

• They indicate the physical state of the compound

• They show the temperature at which the compound melts