vocab
a characteristic of a substance that can be observed and measured without changing the identity of a substance
physical property
positively charged particles of an atoms
protrons
mass/ volume
density
has definite physical and chemical properties such as appearance and melting and boiling point
pure substances
smallest unit of an element that has the properties of that element
atom
describes a substance's ability to change into a new substance with different properties
chemical property
no electric charged but also particles in an atom
neutrons
T or F
elements and compounds are pure substances
true
a mixture that does not have a uniform composition
hetrogeneous
made up of one or more of the same kind of atom chemically combined
element
a change that effects one or more physical properties of a substance
physical change
negatively charged particles of an atom
electrons
how are elements classified in the periodic table
metals, non metals, metalloids
a mixture that does have a uniform makeup
homogeneous
is made up of different kinds of atoms chemically combined
compound
occurs when one or more substance change into entirely new substances with different properties
chemical change
together protrons and neutrons form
a nucleus
how are compounds classified
PH
organic/inorganic
role in the body
how are mixtures classified?
suspensions
solutions
colloids
a variety of elements and compounds that are not chemically combined
mixture
in chemical or physical changes, mass cannot be created or destroyed but is only transformed into different substances
law of conservation of mass
these particles of an atom are found surrounding the nucleus forming a
electron cloud
the following are examples of _________ ___________
reaction with O, rust, flammability, reactivity with another substance
chemical property
the following are examples of__________ _________
density, melting point, color, shape, magnetic, malleable
physical property
the number of protons in the nucleus is the _______
the total number of protrons and neutrons is the ________
atomic number
mass number