Polarity
Chemical Equations
Chemical equation - a chemical “sentence” that describes change, using numbers, symbols, and chemical formulas
Reactants ---------------------------------------------------------------------------------------------------------------> Products
The starting materials of a chemical rxn “yields" New substance that is formed
Go through a chemical rxn indicates the chemical rxn Listed on the right
Listed on the left
Example:
H₂(g) + Cl₂(g) -----> 2HCl(aq)
Law of Conservation of Mass:
Matter can be neither created nor destroyed in physical and chemical changes. Matter is conserved. Individual atoms are conserved in chemical reactions and physical changes, so the number of atoms remains the same from start to finish. Mass is also conserved, so the total mass of the products is equal to the mass of the reactants.
4 Steps for Balancing Equations:
(# atoms of reactants = # atoms of products)