In a heterogeneous mixture , the components may or may not, exist in different physical states, and may contain regions that have different properties from those of other regions. Examples of heterogeneous mixtures are a glass containing sand and water, and a mixture of oil and water. 3.5 Separations of Mixtures. The most common technique to separate homogeneous liquid mixtures is distillation, and it is based on their difference in boiling point. 3.6 Energy and Energy Changes.
Energy is defined as the ability to perform work.
The units for energy are the joule and the calorie. A calorie is defined as the energy required to raise the temperature of one gram of water by one degree. Specific heat is a physical property of all matter.