atoms structure test Flashcards
thins that aren’t matter
light, heat, sound
pure substances
definite composition: each substance has exactly the same composition
element
only one type of atom; iron gold oxygen ect
compound
2 or more types atoms; salt sugar water
elements substances
cannot be broken down and are made up of all the same atoms
monatomic elements
composed of single atoms NOT bonded to each other
diatomic elements
2 of the same elements bonded together
diatomic elements name them.
Bromine Br2, Iodine I2, Nitrogen N2, Chlorine Cl2, Hydrogen H2, Oxygen O2, Fluorine F2 (BrINClHOF)
Elements that exist as diatomic molecules
compounds made up of and can
2 or more different atoms chemically combined.
they have a fixed composition.
can be separated chemically back into simpler substances (elements)
mixture
2 or more different substances that are physically combined.
have varying compositions
what type of mixtures are there
2 types; homogeneous and heterogeneous
homogeneous mixture
substances are uniformly mixed (you can’t see the separate parts) ex; air, sugar in water.
ALL SOLUTIONS ARE HOMOGENEOUS MIXTURES
what does aq stand for
aqueous (dissolves in water)
heterogeneous mixture
substance are not uniformly mixed (you can see the separate parts)
ex; oil & water, sand &a water, chocolate chip cookie
separating a mixture
mixtures can be separated based on physical properties
