Exam One Flashcards
in the scientific method, an EDUCATED GUESS or TENTATIVE EXPLANATION of an observation is called?
a hypothesis
an experimentally tested explanation of a reproducible observed behavior that will predict what might happen in the future is called?
a theory
which of the following terms describes things that are reproducibly observed, predicts what might happen in the future, BUT DOES NOT DESCRIBE WHY THINGS HAPPEN?
scientific law
all of the following represent a chemical change except:
- iron rusting
- burning wood
- milk going sour
- boiling water
- boiling water
all of the following are examples of potential energy except
- blowing wind
- gasoline
- a glass of milk
- a protein bar
- blowing wind
the amount of energy required to raise the temperature of 1 g of water by 1 degree Celsius is defined as:
a calorie
0.00305 in scientific notation?
3.05 x 10^-3
0.114 x 5.2377 (answer in correct sig figs)
0.597
123.667 - 78.9 (answer in correct sig figs)
44.8
which subatomic particle is not charged?
neutron
all of the following are trace elements except:
- iron
- zinc
- carbon
- copper
carbon
which elements are trace elements?
iodine, copper, zinc, manganese, cobalt, and selenium
describe atomic notation
number up top = atomic mass
(Number of PROTONS + NEUTRONS)
number on bottom = atomic number
(Number of protons
periodic table - describe the elements
- metals are on the LEFT SIDE
- non-metals on the RIGHT SIDE
- atoms get LARGER when moving down a GROUP
metals display what characteristics?
- good conductors of heat and electricity
- solid at room temp. (except for mercury)
- malleble and ductile
