Chemistry II AP Core Labs

Links:

Purpose:
To use the additivity of reaction heats (Hess' Law) to indirectly measure a heat of combustion.

Summary:
A heat of reaction that is too fast to be measured directly is obtained algebraically using data from combined equations. Whole separate heats can be measured.

Objectives Links:
III. E: Thermodynamics

Process Skills Checklist

Materials:

• CBL system and TI graphing calculator
• temperature probe
• ring stand
• clamp
• 1.0 M HCl
• 100 mL graduate
• magnesium oxide
• styrofoam cup
• magnesium ribbon
• balance

Safety Concerns:
1.0 M HCl is corrosive. Handle with care. Heat is generated.

Revision Date:
Summer 2001