FINAL EXAM: review packet #1 Flashcards
(27 cards)
The orderly process used for solving problems and investigating the world is the
scientific method
An observation is
made using one or more of your five sense
An inference is
made using an educated guess to describe your observation
what is the stuff collected in experiments through observations and measurements
data
what is a variable in an experiment
the part of the experiment that is being tested or changed
why do people use diagrams and tables and graphs and such
to organize data
first step in a research project
asking a question
what part of the meniscus do you measure from
the lowest part
how would you find the density of a REGULAR SHAPED OBJECT
length x width x hight = volume
what happens to the density of an object if you cut it in half
the density will remain the same
Democritus, John Dalton, JJ Thomson, Ernest Rutherford, and Neils Bohr all helped develop the
atomic theory
three major categories of elements on the periodic table
metal, nonmetal, metalloid
Periods on the periodic table are
left to right like a sentance
groups/families on the periodic table are
vertical
the atomic number is the amount of
protons in an atom
how do you find the mass number of an atom
add the number of protons and neutrons together
what two particles are in the nucleus of the atom
protons and neutrons
electrons are found in the
electron cloud
two nonmetals together form a
covalent bond
a metal and a nonmetal together form a(n)
ionic bond
NOBLE GASES DONT BOND SO JUST BEWARE
ok
what happens in an ionic bond
the metal loses its electrons to a nonmetal and becomes positive, the nonmetal becomes negative after gaining the electron. OPPOSITES ATTRACT AND THEY BOND TOGETHER <3
why do atoms gain/lose electrons in ionic bonds
they gain/lose electrons to have a complete set of electrons in their valance layers
what happens to the characteristic properties of the original reactants during a chemical reaction
the reactants chemically react for new substances with new properties
