unit 1 test Flashcards
what is science?
process based on inquiry that helps develop explanations about events in nature
what are the three categories of science?
life science - living things
earth science - earth and space
physical science - matter and energy
investigations
a way to learn about the natural world
the scientific method order
state the problem
gather info
form hypothesis
test hypothesis
analyze data
draw conclusions
hypothesis
a possible explanation for a problem using knowledge and observation
experiments
tests the effect of one thing on another using a control
variables
a quantity that can have more than a single value
dependent variable
changes according to the changes of the independent variable
independent variable
changed to test the affect on the dependent variable
constant
doesn’t change when the other variables change
control
standard by which the test results can be compared
bias
when the scientists expectations changes how the results are analyzed or the conclusions are made
model
represents an idea, event, or object to help people better understand it
theory
an explanation of things or events based on knowledge gained from many observations and investigations
scientific law
a statement about what happens in nature and that seems to be true all the time
standard
an exact quantity that people agree to use to compare measurements
metric system
system of measurement based on multiples of 10
length SI unit
meter (m)
mass SI unit
kilogram kg
time SI unit
second s
electric current SI unit
ampere A
amount of substance SI unit
mole mol
intensity of light SI unit
candela cd
temperature SI unit
kelvin k
kilo SI prefix
1,000
deci SI prefix
0.1
centi SI prefix
0.01
milli SI prefix
0.001
micro SI prefix
0.000 001
nano SI prefix
0.000 000 001
volume
the amount of space occupied by an object
matter
anything that takes up space and has mass
mass
a measurement of the quantity of matter in an object
density
the mass per unit volume of a material
density equation
d = m/v
freezing point celsius
0
boiling point celsius
100
body point celsius
37
room point celsius
20 - 25
coldest temp possible (absolute zero) (kelvin)
0
true or false: one cm^3 and one mL are the same volume
true
graph
a visual display of info or data
dependent variable goes on which axis?
y
independent variable goes on which axis?
x
line graph
how relationships between variables change overtime
bar graphs
useful for comparing info or displaying data that doesn’t change continuously
circle graphs (pi charts)
show how some fixed quantity is broken into parts
