Law of Conservation and Mass Flashcards
A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound
Subscript
The process by which chemical changes occur. In a chemical reaction, atoms are rearranged, and chemical bonds are broken and formed
Chemical Reaction
A substance that is present at the beginning of a chemical reaction and is changed into a new substance
Reactant
A substance formed by a chemical reaction. A product is made by the rearrangement of atoms and bonds in reactants
Products
A solid in that forms as a result of a reaction between chemicals in two liquids
Precipitate
A law stating that atoms are not created or destroyed in a chemical reaction
Law of Conservation of Mass
The number before a chemical formula that indicates how many molecules are involved in a chemical reaction
Coefficients
A chemical reaction that releases energy
Exothermic Reaction
A change of one substance into another substance
Chemical Change
A physical change is a change in which no new substances are formed. Physical changes affect the form of a chemical substance, but not its chemical composition. Mixtures can be separated into their parts by physical methods, such as spinning in a centrifuge.
Physical Change
a material system in which mass or energy can be lost to or gained from the environment.
Open System
In nonrelativistic classical mechanics, a closed system is a physical system that doesn’t exchange any matter with its surroundings, and isn’t subject to any force whose source is external to the system. A closed system in classical mechanics would be considered an isolated system in thermodynamics.
Closed System
A chemical reaction that absorbs energy
Endothermic Reaction
An expression that shows the number and types of atoms joined in a compound
Chemical Formula
