Explanation of Science

Definitions:
Physical change- a change in physical state (solid, liquid, or gas) with no change in chemical composition. Dissolving a solute in a solvent is a physical change.
Chemical change- a change in chemical composition to a different kind of matter.
Heat- energy transferred between two objects
Temperature- measurement of average kinetic energy (motions)
Endothermic- heat is transferred out
Exothermic- heat is absorbed in
Heat of salvation- the sum of the energy it takes a solvent to break apart a substance into individual molecules or ions and keep them apart in solution. This can be endothermic or endothermic. The addition of ammonium chloride, calcium chloride, and sodium bicarbonate to water causes each to be dissolved generating a temperature difference.
Heat of reaction- the energy generated when a chemical reaction takes place. This can be endothermic or endothermic.
Baking soda is sodium bicarbonate that has many household uses including putting out cooking stove fires and deodorizing refrigerators.
Vinegar is a 5 percent acetic acid solution.
When baking soda is added to vinegar a chemical reaction takes place and sodium acetate, water, and carbon dioxide gas are produced.