PHYSICAL SCIENCE EXAM QUESTIONS WITH COMPLETE
SOLUTIONS LATEST UPDATE
Atomic number
equal to the number of protons
Atomic mass
equal to the number of protons and neutrons
group number
equal to the number of valence electrons
protons
positive charge, found in nucleus
electrons
negative charge, found in "electron cloud" outside nucleus
neutrons
neutral charge, found inside nucleus
mixtures
separated by physical means
homogeneous mixture
all parts are equal and look the same (Kool Aid)
heterogeneous mixture
parts in different proportions and can be identified (chocolate chip ice cream)
substances
cannot be separated by physical means
elements
substances that are made of one kind of matter
compounds
2 or more elements bonded together
solid
molecules vibrate but have a fixed position with definite volume and shape
liquid
, molecules can flow easily with definite volume, but take shape of the container
gas
molecules move freely with no definite shape or volume
plasma
extremely high energy state of matter with no definite shape or volume
melting
solid to liquid
evaporation
liquid to gas
freezing
liquid to solid
condensation
gas to liquid
sublimation
solid to gas
deposition
gas to solid
atomic nucleus
center of atom, contains protons and neutrons
valence electrons
electrons on the outer energy level of any atom (most atoms want to have 8)
energy levels
fixed paths or orbits that surround the nucleus where electrons are found (2 electrons
on 1st, 8 electrons on 2nd, 18 electrons on 3rd)
atomic symbol
one or two letters used to represent an element
atomic name
name given to element
isotope
same element with different number of neutrons
group
SOLUTIONS LATEST UPDATE
Atomic number
equal to the number of protons
Atomic mass
equal to the number of protons and neutrons
group number
equal to the number of valence electrons
protons
positive charge, found in nucleus
electrons
negative charge, found in "electron cloud" outside nucleus
neutrons
neutral charge, found inside nucleus
mixtures
separated by physical means
homogeneous mixture
all parts are equal and look the same (Kool Aid)
heterogeneous mixture
parts in different proportions and can be identified (chocolate chip ice cream)
substances
cannot be separated by physical means
elements
substances that are made of one kind of matter
compounds
2 or more elements bonded together
solid
molecules vibrate but have a fixed position with definite volume and shape
liquid
, molecules can flow easily with definite volume, but take shape of the container
gas
molecules move freely with no definite shape or volume
plasma
extremely high energy state of matter with no definite shape or volume
melting
solid to liquid
evaporation
liquid to gas
freezing
liquid to solid
condensation
gas to liquid
sublimation
solid to gas
deposition
gas to solid
atomic nucleus
center of atom, contains protons and neutrons
valence electrons
electrons on the outer energy level of any atom (most atoms want to have 8)
energy levels
fixed paths or orbits that surround the nucleus where electrons are found (2 electrons
on 1st, 8 electrons on 2nd, 18 electrons on 3rd)
atomic symbol
one or two letters used to represent an element
atomic name
name given to element
isotope
same element with different number of neutrons
group
