chemistry test ﴾ⵙᗝⵙ﴿ Flashcards
any substance that mass and takes up space is called what?
matter
what is a particle?
the building block of batter
what is a reactant?
a substance that is the starting material for a chemical change
what is a Molecule?
Smallest part of a substance. They are made up of one or more atoms.
what are Atoms?
the smallest particle of a chemical element that can exist.
what is Precipitate?
- A solid formed in some chemical reactions.
what is a Subatomic particle
Neutrons, electrons, and protons. a particle smaller than an atom
what is a Neutron?
One of the three subatomic particles that make up an atom. Neutrons are neutrally charged.
solid partials have …
A fixed volume and shape
liquid particles have…
No fixed shape and fixed volume
gas particles have…
No fixed volume or shape
what is an element?
basic unit of matter/ combination of protons neutrons and electrons
what is a proton
It is one of the subatomic particles that make up an atom. protons are positively charged and help with the movement of electrons.
what is a electron
it is one of the subatomic particles that make a an atom and carry a negative charge
how many atoms are there in an element
one ( an atom is and element )
what does the atomic number tell as
number of protons
what does the atomic mass/ weight ( mass number ) tell as about an atom
number of protons + neutrons
what does COBALT stand for ?
C- color change O-odor B-bubbles A- appearance or dissidence of substance L- light and sound T- temp change
what is COBALT used for
it is signs of chemical change
what is sublimation
solid into gas e.g dry ice
what is condensation
gas into liquid e.g a can of cold soda
protons and electrons are the same T or F
T
the period number says what?
the number of shells
the group number says what?
the number of electrons on the outer shell
how can you identify a physical change
reversible change, no new substance, chemical property remain the same, change in shape, state of mater
do solid particles move
yes they vibrate
what particles out of solid liquid and gas moves the fastest
gas
is gas compressible
yes
are liquid compressible
no
are solids compressible
no
what are the groups on the periodic table
1.alkali metals 2. alkaline earth metals 7. halogens 8. noble gases
