Chemical Equations
Describe the # of atoms in a molecule.
Subscript
To balance a chemical equation, you must have the same number of these of each element.
Atoms
Oxygen has this many valence electrons.
6
Changes the form or appearance of a substance.
Does not change substance into anything new
Physical Change
Newton's 2nd Law
F=MA
Represents the number of molecules.
Coefficient
An electron dot diagram provides information on the number of these on an element.
Valence Electrons
Oxygen has this many electron shells.
2
When two or more substances join to form new substances with new chemical properties.
Chemical Change
Never ever ever ever ever change this in a chemical equation.
SUBSCRIPT!
Elements or compounds which exist PRIOR to a chemical reaction.
Reactants
If a chemical equation is unbalanced, you can only change this to make it balanced.
Coefficient
These elements are unique because they only want 2 valence electrons to be stable.
Hydrogen and Helium
A chemical reaction between substances, usually including oxygen gives off these two things.
Heat and Light
The measure of the change in velocity during a period of time.
Acceleration
New substances that are created by the rearranging of atoms after a chemical reaction.
Products
Matter (atoms) can neither be created nor destroyed. Atoms can only be rearranged.
Law of Conservation of Mass
Balance this
NaBr + CaF2 🡪 NaF + CaBr2
2NaBr + CaF2 🡪 2NaF + CaBr2
When gases produced in a chemical reaction are released you get these.
Bubbles
The total momentum of a group of objects remains the same unless outside forces act on the objects.
The Law of Conservation of Momentum
In a chemical formula, this represents a chemical reaction.
Arrow
Subscript
Balance this equation
H2 + O2 → H2O
2H2 + O2 → 2H2O
Whipping eggs
Boiling water
Dissolving sugar
Dicing vegetables
Physical Change
Any of two or more atoms of the same element that have different numbers of neutrons.
Isotope