AP Chem 6.1, 6.2 Introduction to Thermochemistry

During formation of chemical bonds energy is ________________________.

• released

• absorbed

• destroyed

• unchanged

The breaking of chemical bonds is a(n) ________________________ process.

• endothermic

• exothermic

• isothermal

• adiabatic

Stretching a rubber band until it breaks is a(n) __________________________ process.

• endothermic

• exothermic

• isothermal

• adiabatic

Releasing a stretched rubber band is a(n) __________________________ process.

• exothermic

• endothermic

• isothermal

• adiabatic

Which step in the process below is endothermic?
Process 1: Cl(s) → Cl(g)
Process 2: Cl(g) → Cl⁺(g) + e⁻
Process 3: Cl₂(g) → 2Cl(g)
Process 4: Cl(g) + e⁻ → Cl⁻(g)

Hint: Bonds must be broken

• step 1

• step 2

• step 3

• step 4

Which bond stores the most energy per mole?

• C-H

• N-H

• H-H

• C=C

Does breaking bonds require energy, release energy, or not involve energy at all?

• requires energy to break

• releases energy when broken

• No energy involved

In a chemical reaction, atoms ________ and form new bonds.

• rearrange
• move

• blow up

• go away

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5