Chapter Five, Lesson Two: Describing Chemical Reactions Flashcards
chemical equation
A chemical equation is a way to show a chemical reaction, using symbols instead of words.
law of conservation of mass
The law of conversation of mass states that during a chemical reaction, matter is not created or destroyed.
open system
In an open system, matter can enter from or escape to the surroundings.
closed system
In a closed system, matter does not enter or leave.
coefficient
A coefficient is a number placed in front of a chemical formula in an equation.
synthesis
In chemistry, when two or more elements or compounds combine to make a more complex substance, the reaction is classified as synthesis.
decomposition
In contrast to a synthesis reaction, a decomposition reaction occurs when compounds break down into simpler products.
replacement
When one element replaces another element in a compound, or if two elements in different compounds trade places, the reaction is called a replacement.
