Question

List the types of chemical changes that can yield exothermic and endothermic peaks in DTA and DSC.

Short answer

Dehydration gives endothermic peaks; decomposition gives endothermic peaks or exothermic peaks. Oxidation can also give exothermic peaks.

Step-by-step solution

Step 1. Given information

List the types of chemical changes that can yield exothermic and endothermic peaks in DTA and DSC.

Step 2. Differential scanning calorimetry and Differential thermal analysis.

The change which takes place in a substance is observed during a change in temperature is known as thermal analysis. Two kinds of the analysis are differential scanning calorimetry anddifferential thermal analysis. In case ofdifferential thermal analysis it measures the gap between temperatures of sample and inert reference which is chemically stabled. Butdifferential scanning calorimetry deals with the heat difference between them.

Step 3. Chemical changes can yield exothermic and endothermic peaks in DTA and DSC.

• Dehydration gives endothermic peaks. Decomposition gives endothermic peaks or exothermic peaks.
• Oxidation can also give exothermic peaks.