Oxidation States and Compounds

The video tutorial explains how to determine the oxidation state of hydrogen in magnesium hydride (MgH2). It outlines a step-by-step process, starting with checking if the substance is elemental, then determining if it has a charge, identifying elements with specific rules, and finally using general rules to define oxidation states. The tutorial emphasizes the importance of understanding that the sum of oxidation numbers in a neutral molecule is zero. It uses tables for clarity and concludes with the correct oxidation state of hydrogen as -1 when paired with a metal like magnesium.

What is the main objective of the problem discussed in the video?

• To find the molecular weight of magnesium hydride

• To determine the oxidation state of hydrogen in magnesium hydride

• To calculate the charge of magnesium hydride

• To identify the elements in magnesium hydride

What is the first step in determining the oxidation state of an element in a compound?

• Check if the compound is a polyatomic ion

• Determine if the substance is elemental

• Apply the general rules for oxidation states

• Identify the charge of the compound

What should be done if a compound is not elemental?

• Calculate the molecular weight

• Apply the general rules for oxidation states

• Move on to determine if the substance has a charge

• Identify the elements in the compound

Which of the following is a general rule for oxidation states?

• Hydrogen is always +1

• Oxygen is always -1

• Magnesium is always -2

• Group 2 metals are always +2

What is the oxidation state of magnesium in magnesium hydride?

• 0

• +1

• +2

• -1

How many hydrogen atoms are present in magnesium hydride?

• One

• Four

• Two

• Three

What is the total oxidation number of hydrogen in magnesium hydride?

• 0

• +2

• -1

• -2

What is the base oxidation number of hydrogen when paired with a metal?

• +1

• +2

• 0

• -1

Why is it important to know the sum of oxidation numbers in a compound?

• To identify the elements present

• To determine the molecular weight

• To ensure the compound is neutral

• To calculate the charge of the compound

What is the correct oxidation state of hydrogen in magnesium hydride?

• +1

• 0

• -1

• +2