UNIT 1 TEST

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