Chemical Reactions and Equations

Dr. English introduces chemical reactions, explaining their symbolic representation, why they occur, and the symbols used in chemical equations. The video covers how to denote physical states and provides practice examples for writing chemical equations. It concludes with a summary of the key points discussed.

Which of the following is an example of a chemical reaction?

• Melting ice

• Cooking an egg

• Breaking a glass

• Boiling water

In a chemical equation, what is typically found on the left-hand side?

• Products

• Catalysts

• Reactants

• Inhibitors

Why do chemical reactions occur?

• To decrease pressure

• To achieve stability

• To change color

• To increase temperature

What does a plus sign in a chemical equation indicate?

• A reaction is complete

• Substances are combining

• A reaction is starting

• Substances are separating

What does the symbol 's' represent in a chemical equation?

• Solid

• Solution

• Sublimation

• Suspension

What does the symbol 'aq' indicate in a chemical equation?

• Aqueous solution

• Air quality

• Aqueous solid

• Aqueous gas

What is the correct formula for silver nitrate?

• AgNO2

• AgNO3

• AgN

• AgN2O

What is the product when hydrogen peroxide decomposes?

• Hydrogen and oxygen

• Water and oxygen

• Hydrogen and nitrogen

• Water and nitrogen

What is the charge of copper in copper(II) nitrate?

• +1

• +2

• -1

• -2

What is the atomic symbol for copper?

• Co

• Cu

• C

• Cp