UNIT 2- Chemistry JAC Flashcards
Atoms
the basic building block of chemistry
Molecules
made up of one or more atoms
substance
physical material from which something is made or which has discrete existence
homogeneous mixtures
one whose composition is uniform throughout the mixture
homogeno us mixtures
one whose composition is uniform throughout the mixture
chemical properties
a characteristic of a substance that may be observed when it participates in a chemical reaction
physical property
a characteristic of a substance that can be observed or measured without changing the identity of the substance
isotopes
Atoms with the same number of protons but different numbers of neutrons
Elements
A basic part of a whole
compounds
a substance made from two or more different elements that have been chemically joined.
Reactants
a substance that is present at the start of a chemical reaction
products
any item or service you sell to serve a customer’s need or want
Hydrogen bonds
a weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other.
valence electrons
the electrons located at the outermost shell of an atom
covalent bonds
the interatomic linkage that results from the sharing of an electron pair between two atoms
anion
Those with a negative charge
periodic table- groups
the organized array of all the chemical elements in order of increasing atomic number
Ionic bounds
type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound
cation
An anion may be defined as an atom or molecule that is negatively charged. A cation may be defined as an atom or molecule that is positively charged
periodic table rows
seven horizontal rows, called periods or series
Bases
Foundation or main support of something.
PH scale
measures how acidic or alkaline a substance is
Acids
A chemical that gives off hydrogen ions in water and forms salts by combining with certain metals
