vocab test Flashcards
(22 cards)
the splitting of the nucleus if an atom releasing great amounts of energy
nuclear fission
one or more substances interact to form new substances
chemical reaction
sentences written in the form if an equation using symbols
chemical sentence
evidence gathered by studying how matter behaves in all kinds of chemical reactions
inderect evidence
electrons moving around the nucleus in paths
orbit
a model of an atom
planetary model
when positive and negative charges balance each other
neutral
when an atom loses electrons
positive ion
when an atom gains electrons
negitive ion
when two different atoms chemically bond
covalent compound
positive and negative ions attracted to each other
ionic compound
matter that cannot be created or destroyed by any chemical reactions
law of conservation of mass
a change in size or state of mater with no new kind of matter being formed
physical change
a change in matter that results in one or more new substances with new properties
chemical change
something used or made to represent an object or to describe how a process takes place
model
the dense central part of an atom
nucleus
a positively charged particle found in the nucleus of an atom that has no electric charge
proton
a particle in the nucleus of an atom that has no electric charge
neutron
a negatively charged particle in an atom
eletron
the number of protons in the nucleus of an atom
atomic atom
an eletricly charged atom
ion
an element made up of atoms whose nuclei break down or decay into nuclei of other atoms
radio active elements
