Chemistry #1
basic unit of matter
Atom
smallest unit of most compounds
Molecule
Number of protons in an element
Atomic Number
The electrons in the outermost shell of an atom
Valence Electron
an element that has a positive or negative charge because the element does not have the same number of electrons as protons
Ion
a substance formed by the chemical bonding of two or more elements
Compound
a chemical substance formed as a result of a chemical reaction
Product
A force of attraction between two atoms
Chemical Bond
substance that speeds up the rate of a chemical reaction
Catalyst
the center of the atom which contains the protons and neutrons
Nucleus
an atom with a specific number of protons in the nucleus and located on the periodic table
Element
elements or compounds present at the start of a chemical reaction
Reactant
process that changes one set of chemicals into another set of chemicals
Chemical Reaction
a substance that slows down or stops a chemical reaction
Inhibitor
a subatomic particle that has a positive charge and that is found in the nucleus of an atom
Proton
a substance made of elements and or compounds stirred together
Mixture
chemical reaction in which energy is given off in the form of heat or light
Exothermic
a way to describe a chemical reaction using chemical formulas and other symbols using chemical formulas and symbols
Chemical Equation
compounds that have a sour taste, turn universal indicator orange/red, releases hydrogen ions in water, and have a pH lower than 7
Acid
A subatomic particle that has no charge and that is found in the nucleus of an atom
Neutron
has mass and occupies space
Matter
chemical reaction in which energy is absorbed
Endothermic
a measure of how hot (or cold) something is; specifically, a measure of the average kinetic energy of the particles in an object
Temperature
compounds that feel slippery, turn universal indicator blue/green; releases hydroxide ions when in water, and have a pH higher than 7
Alkaline
Negatively charged particle in an atom
Electron