Chemical Formulas & Equations Flashcards
Chemical Formula
Tells us the number of atoms of each element in a compound or in a chemical reaction.
Ex: H^2O = 2 atoms of hydrogen, 1 atom of oxygen
Coefficient
Represents the number of units of each substance taking part in a reaction.
Ex: 5 H^2O (5 molecules of water)
Subscript
Written below and to the right of each element. Tells the number of atoms of each element in the compound/molecule. (No subscript equals one atom)
Ex: CO^2 = 2 atoms of oxygen, 1 atom of carbon.
Balanced chemical equation
An equation where the number of atoms of each element is the same on both sides of the equation.
Law of conservation of mass
In a chemical reaction, mass is neither created nor destroyed.
*In order to satisfy that law of conservation of matter, the mass of reactants will always equal the mass of the products
Reactants
Substances that are about to reach in a chemical reaction
Products
Substances that are produced from a chemical reaction
How many atoms of each element are present in each compound below?
- CaCO^3 2. 2AgNO^3 3. Cu(NO^3)^2
- Ca = 1, C = 1, O = 3
- Ag = 2, N = 2, O = 6
- Cu = 1, N = 2, O = 6
Synthesis Reaction
2 or more substances chemically combine to form 1 substance. CHEMICAL MARRIAGE.
A + B = AB
Decomposition Reaction
One substance chemically breaks down onto 2 or more simpler substances. CHEMICAL DIVORCE.
AB — A + B
Single Displacement Reaction
One element replaces another in a compound. I’VE MET SOMEONE ELSE, IM LEAVING YOU.
Ab + C — CB + A
Double Displacement Reaction
The positive ion of one compound switches with the positive ion of the other compound. TRADING SPOUSES.
AB + CD —- AD + CB
Combustion Reaction (Burning)
An reaction where a reactant combines with oxygen gas to produce water and carbon dioxide. We commonly call this reaction burning.
O^2 —- CO^2 + H^2O
