ch 11 pre-quiz
distinguish between atoms and molecules. whis is made of which?
?
an infant gains 10 pounds, why would you consider this to be an example of a chemical change?
??
is chemistry the study of the submicroscopic, the microscopic, or all three?
all of the above bc most everything is made of atoms and molecules
the proper name for the chemical compound NH4NO3 is
ammonium nitrate
chemistry primarily focuses on
atoms and their interactions
consider a steaming aluminum soda-pop can that contains a small amount of boiling water. when it is quickly inverted into a bath of coller water, the can is crushed by atmospheric pressure. this occurs bc the pressure inside the can is rapidly reduced by
condensation of steam inside
one example of a periodic trend is the
decrease in atomic size moving from left to right across the periodic table
the proper name for the chemical compound N2O is
dinitrogen oxide
elements within the same....tend to have similar properties
group
when bringing water to a boil in the mountains, the time needed to reach the boiling point is
less than at sea level
The phase in which atoms and molecules no longer move is the
none of the above...liquid, gas, solid phase
can be made into thin sheets
physical
conducts electricity
physical
turns into a silvery liquid when heated in the absence of oxygen
physical
one element is distinguished from another by the number of
protons
gases are so much easier to squeeze into smaller volumes than liquids or solids bc
there is so much space in between the submicroscopic particles
we are warmed by condensation because water molecutles in the air that strike out bodies
transfer some of their kinetic energies to us