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35 Cards in this Set

  • Front
  • Back
the study of matter and the changes that take place with that matter
anything that has mass and occupies space - anything made up of atoms and molecules
the basic building blocks of all things - they are what elements are made of
the center of an atom. It contains the subatomic particles protons and neutrons
positively charged (+) subatomic particles in the nucleus of an atom
subatomic particles in the nucleus of an atom that have no charge
negatively charged (-) subatomic particles that spin around the nucleus of an atom
a particle of matter - they combine in various ways to form atoms
this is a word for atoms and molecules that contain a charge
Positive Ions
ions that have more protons than electrons
Negative Ions
ions that have more electrons than protons
A substance that cannot be broken down by chemical means. They are defined by the number of protons they possess.
Periodic Table of Elements
A chart that organizes all the known elements in order from left to right and top to bottom in order of increasing atomic number (the number of protons they possess)
Chemical reaction
a chemical change which forms new substances - can involve changing one molecule into a different molecule or breaking one molecule down into smaller molecules, atoms, or ions
a group of two or more atoms that stick together
a molecule which is the combination of hydrogen and oxygen atoms
giant molecules made up of many molecules all strung together to form really long chains (and sometimes more complicated structures too)
items you need to do an experiment
the steps you do during an experiment
what you see during an experiment
explains what your observations of an experiment tell you about atoms and molecules
two or more substances which do not change when combined - they can be separated again - they remain what they are
a new substance formed when two or more atoms join together in a chemical reaction
A type of mixture in which the substances mixed together don't settle out.
a state of matter in which the molecules of a substance have been packed close together - it is usually hard and retains its shape
a state of matter in between solid and gas - it takes the shape of the container it is in, and likes to stay together (the molecules are "sticky")
a state of matter in which the atoms are widely spread out and bounce around constantly
Physical Change
When a substance changes but keeps the same identity
Chemical Change
When substances change to form new substances
Groups (Periodic Table)
The columns in the Periodic Table. They contain the same number of electrons in the outer shell.
The rows in the Periodic Table. They tell you how many electron shells an element has.
Relative Atomic Mass
The average mass number of the atoms in a sample of an element. The mass number is the total number of protons and neutrons in a nucleus.
Atomic Number
The atomic number is the number of protons in the nucleus of an atom. It is unique for each element and is usually designated by a subscript to the left of the elemental symbol.
Chemical Symbol
A one or two letter notation for one of the elements in the periodic table. (Examples: H is the chemical symbol for Hydrogen, Na is the chemical symbol for sodium.)
Similar Behavior of Elements
Elements that behave in more-or-less similar ways are sometimes grouped together by shading them a certain color on the table. Examples of such groupings are: non-metals, semi-metals, metals, transition metals, and inner-transition metals.