Chemical Equations and Valency Concepts

The video tutorial covers the reaction of metals with oxygen, focusing on writing and balancing chemical equations. It begins with an introduction to the topic and objectives, followed by an explanation of diatomic elements and valency. The tutorial provides a detailed example of balancing the reaction of aluminium with oxygen and offers practice exercises for other metals. It also discusses transition metals and their unique valency considerations.

What is the main focus of the lesson on the reaction of metals?

• Reaction of metals with bases

• Reaction of metals with acids

• Reaction of metals with oxygen

• Reaction of metals with water

Which of the following is a diatomic element?

• Helium

• Carbon

• Neon

• Oxygen

How should diatomic elements be represented in chemical equations?

• With a subscript of 4

• As single atoms

• With a subscript of 2

• With a subscript of 3

What is the valency of elements in Group 2 of the periodic table?

• 4

• 2

• 3

• 1

What is the first step in writing a chemical equation for a reaction?

• Calculating the valency

• Highlighting diatomic elements

• Writing the word equation

• Balancing the equation

In the reaction of aluminium with oxygen, what is the formula for aluminium oxide?

• Al3O2

• Al2O3

• Al2O

• AlO

What is the purpose of placing boxes in front of formulas when balancing equations?

• To add elements

• To subtract elements

• To multiply the number of atoms

• To divide the number of atoms

What should be done if the valency numbers can be simplified in a chemical formula?

• Divide them by a common factor

• Multiply them

• Leave them as they are

• Add them together

Which of the following metals is a transition metal?

• Copper

• Magnesium

• Calcium

• Sodium

What is the valency of zinc when forming zinc oxide?

• 3

• 4

• 2

• 1