Science Unit 1 (EQs 1-9)

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Terms in this set (...)

observation
information gathered using the 5 senses. direct observation- information gathered using your own senses. indirect observation- information gathered from another's senses and obtained through books, TV, internet, word of mouth, etc.
inference
a logical interpretation of observations
hypotheses
an explanation that is based on prior scientific research or observations and inferences that can be tested
Skeptic's Creed
"Extraordinary claims require extraordinary evidence."
1st Principle of Science
"I don't know and I am going to try to find out."
Exquisite Balance
the balance between gullibility and skepticism.
scientific inquiry
a process used by scientists to design and carry out investigations, ask questions, and gather information
scientific methods
a series of steps followed to solve problems. these include asking questions, making observations, forming and testing hypotheses, analyzing results, drawing conclusions, and communicating results. not all steps are done all the time nor are they always done in order.
controlled experiment
it tests one factor at a time. it has 1 control group and one or more experimental groups.
variable
The factor being tested in an experiment. It is different in each experimental group.
polymer
a large molecule in the form of a chain whose links are smaller molecules called monomers.
hydrophilic
having an affinity for water; readily or dissolving in water
physical property
a characteristic or a substance that does not involve a chemical change, such as density, hardness, or color.
physical change
a change of matter from one form to another without a change in chemical properties.
mass
a measure of the amount of matter in an object
volume
the amount of space an object takes up
density
the ratio of the mass of a substance to the volume of the substance.
equator
an imaginary circle around the middle of the earth, halfway between the North Pole and the South Pole
tropic of cancer
a line of latitude 23.5 degrees North of the equator
tropic of capricorn
a line of latitude 23.5 degrees South of the equator
arctic circle
A line of latitude located at 66.5 degrees north, by the north pole
antarctic circle
A line of latitude located at 66.5 degrees south, by the south pole
solstice
The two days of the year on which the noon sun is directly overhead at either 23.5 degrees South or 23.5 degrees North (Summer and winter solstices)
equinox
The two days of the year on which neither hemisphere is tilted toward or away from the sun (vernal and autumnal equinoxes)
circumstantial evidence
things that we don't know for sure