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a single variable
a controlled experiment allows the researcher to isolate and test this
100 degrees
the amount of temperature between freezing and boiling
meter
the basic unit of length in the metric system
careful observation
this is what the work of a scientist begins with
theory
a hypothesis CANNOT be considered this
a balance
you should use this to measure mass
skull and crossbones symbol
if you see this, you should be aware that you are working with hazardous chemicals
scientists publish data because…
so that their work can be replicated
test a hypothesis
this is the purpose of an experiment
a scientific theory
may be revised as new evidence is presented
this is NOT a goal of science
using data to support a particular point of view
hypotheses
may arise from prior knowledge, logical inferences, and imaginative guesses
heredity
all living things have the ability to pass their genes onto the next generation with this characteristic of life
biology
the study of life
hypothesis is useful only if
it can be tested
generalizing
this is NOT a part of how scientists work
theory
when enough experimental data supports a hypothesis, then the hypothesis becomes this
example of observation
a scientist noticed the number of salamanders in ponds in the rocky mountains was declining
rinse it off
this is what you should do if you spill acid on your skin
example of quantitative observation
temperature of water
dependent variable
the variable that is being measured in the experiment
the salt in the soil
If salt in the soil affects plant growth, the plants growing in salty soils will have their growth affected. Which is the independent variable?
the boy has two shoes on
observation
the boy is not smart
inference
the boy is near the school
observation
the boy didn’t read the sign on the door
inference
graduated cylinder
an object you use to measure liquid
mass
you use a balance and it is measured in grams
volume
you use a graduated cylinder/beaker and it is measured in liters
temperature
you use a thermometer and it is measured in celcius
distance
you use a ruler or meter stick and it is measured in meters