Chemestry Flashcards
Change in form, NOT composition
NO new substances formed
Change can be reversed
Physical Change
Re-arrangement of atoms
1 or more new substances formed
Difficult or impossible to reverse
chemical change
quantitive physical property
(measurable, e.g. boiling point)
qualitative physical property
(without measurement, e.g. color)
physical property
observed/measured without forming a new substance
chemical property
how a substance reacts with another substance
Diatomic molecules
BrINClHOF - elements will always present together when alone
Molecules
cluster of atoms
Ionization
(transferring electrons between atoms and therefore altering the balance of negative and positive charges)
which does not create ions? molecular or ionic?
molecular
when 2 + substances undergo a reorganization of atoms to form other substances
chemical reaction
To break bonds, energy must be added / absorbed
endothermic
To form bonds, energy must be released
exothermic
combustion products
CO2 + 2H2O + heat
corrosion reactants
metal + salty water + air