Unit 5 Lesson 1: Energy in Chemical Bonds

During bond formation energy is_______

• absorbed

• released

• constant

Which statement is true for the reaction: O + O --> O₂

• A bond is broken and energy is released

• A bond is broken and energy is absorbed

• A bond is formed and energy is released

• A bond is formed and energy is absorbed

Which statement is true in regards to the following equation: AB--> A + B

• A bond is formed and energy is released

• A bond is formed and energy is absorbed

• A bond is broken and energy is released

• A bond is broken and energy is absorbed

Bond formation between two atoms is generally

• Exothermic, which absorbs energy

• Exothermic, which releases energy

• Endothermic, which absorbs energy

• Endothermic, which releases energy

When a bond forms between two atoms, the stability of the atoms

• increases

• decreases

• remains the same

What is Potential Energy?

• Electromagnetic Energy

• Energy of movement

• Stored Energy

• Spend Energy

What occurs when the reaction takes place?

2HCl --> H₂ + Cl ₂

• H-Cl bonds are forming and H-H bonds are breaking.

• H-Cl bonds are breaking and H-H bonds are forming

• H-Cl bonds are forming and Cl-Cl bonds are forming.

• H-H bonds are breaking and H-Cl are forming

What kind of energy is released or absorbed when chemical bonds are formed and broken?

• kinetic energy

• thermal (heat) energy

• chemical energy

• light energy

How many C-H bonds are present here?

• 4

• 5

• 6

• 7

How many carbon-oxygen double bonds are present here?

• 1

• 2

• 3

• 4