8th Grade Science Notes: Chemistry
Overall Chemistry Vocabulary; Key Points
simplest pure substance
the basic building blocks of all matter.
Atoms (made of)
made of protons, neutrons, and electrons.
POSITIVELY charged and inside the nucleus
NEUTRAL particles inside the nucleus
NEGATIVELY charged particles OUTSIDE the nucleus
determines an elements identity and the number of protons and electrons in an atom.
protons + neutrons
Atomic #= # of protons= # of electrons
Extremely reactive, containing one valence electron, and is never found in their pure form.
Slightly less reactive than Alkali Metals, and have 2 valence electrons.
Shiny, less reactive, and good conductors
Lanthanides and Actinides.
Transition metals that are reactive
Shiny & reactive
tells the number of electron shells
# of valence electrons
very reactive non metals that are poor conductors and tend to go with Alkali metals
non reactive non metals
Atoms of elements that have the same number of protons but a different number of neutrons inside the nucleus
Charged particles that form during chemical changes. They form when one or more valence electron is transferred.
tiny numbers to the bottom right of an element's symbol
a number placed in front of a molecular formal to indicate how many molecules/atoms take part in the reaction.
Tigers Pounce on colored Geckos
Law of Conservation of mass
in a chemical change, the mass of reactants at the start is equal to the mass of the products
any substance that is used up during a reaction
any substance that is produced during a reaction
easily observed w/o tempering with the product
only observed during chemical reactions. ex) is it combustable?
occur when substances are changed to another phase, are separated or combined. No new substance is produced
occur when a new chemical substance is produced after a reaction