AP Chemistry Summer Assignment Flashcards
The simplest form of matter
an element
Combinations of elements that have a definite composition
compounds
atoms of an element image
single dots
molecules of an element image
groups of two dots together
molecules of a compound image
groups of multiple dots together
elements/compounds existing in the solid state of matter…
definite shape, definite volume, particles are tightly packed and organized, particles vibrate gently in fixed positions
elements/compounds existing in the liquid state of matter…
indefinite shape (take shape of container), definite volume, particles are free to slide around one another
elements/compounds existing in the gas state of matter…
indefinite shape (takes shape of container), indefinite volume (spreads out to fill the space), particles are free to move around
all matter…
has mass and occupies space
physical properties
can be observed without changing the identity and composition of the substance
chemical properties
describe how a substance reacts with other substances
physical properties examples
color, odor, density, hardness, solubility, melting point, boiling point
chemical properties examples
acid-base reactions, oxidation and reduction (REDOX), and flammability
physical change
a substance changes its physical appearance, but not its composition
chemical change
also called a chemical reaction, a substance is transformed into a chemically different substance, often accompanied by observable changes like color changes and energy changes
physical change examples
most common are changes of state, solid to liquid (melting), liquid to gas (boiling), gas to liquid (condensing), solid to gas (sublimation), gas to solid (deposition), liquid to solid (freezing)
chemical change examples
Hydrogen (H2) burns in air (O2), chemical because it combines with oxygen to form water (H2O)
physical changes IMFs or IntraMFs
IMFs (the forces between particles) are disrupted, boiling water separates one water molecule (H2O) from another water molecule but does not break any individual water molecule apart
chemical changes IMFs or IntraMFs
Intramolecular forces (the forces within substances) are disrupted, during electrolysis of water, one water molecule (H2O) splits up to form O2 and H2 atoms, individual water molecules do break apart
which elements exist as diatomic molecules?
N, O, F, Cl, Br, I –> (start at 7 make a 7)
pulverise
to crush/grind
unit and symbol for Mass for SI (System International)
Kilogram, kg
unit and symbol for Length for SI (System International)
Meter, m
unit and symbol for Time for SI (System International)
Second, s
unit and symbol for amount of substance for SI (System International)
Mole, mol
unit and symbol for Temperature for SI (System International)
Kelvin, K
symbol and meaning for Giga for SI (System International)
G, 10⁹
symbol and meaning for Mega for SI (System International)
M, 10⁶
symbol and meaning for Kilo for SI (System International)
K, 10³