At a scientific conference, a researcher suggests that fossil fuels did not originate from the
decomposition of organic materials, but instead were produced by inorganic means. What does this
statement represent? - hypothesis
When might scientists analyze or test a model instead of the real syst...
At a scientific conference, a researcher suggests that fossil fuels did not originate from the
decomposition of organic materials, but instead were produced by inorganic means. What does this
statement represent? - ✔✔hypothesis
When might scientists analyze or test a model instead of the real system of interest? - ✔✔when the
real system is too complex or difficult to analyze
Which of these is true about scientific theories and scientific laws? - ✔✔A law describes
something specific that always happens, while a theory explains why or how a range of phenomena
happen.
If new data were found to disagree with a long-standing theory, which of the following could happen? -
✔✔The theory could be modified or discarded.
Why would you measure the distances to two nearby towns in kilometers rather than millimeters?
- ✔✔you would have to use too many zeroes for the distance in millimeters
Using the base SI unit for temperature, the boiling point of water can be written as - ✔✔373K
You have a piece of play dough. If you cut the piece in two equal parts, its density will
. - ✔✔stay the same
is the study of atoms and molecules, their structures, and their interactions to form new substances. -
✔✔chemistry
, Which field of physical science MOST directly explains how the motion of the continents over 100
million years led to mountains and volcanoes in some places above land, and deep ocean trenches
in other places beneath the ocean surface? - ✔✔earth science
Ocean tides are caused by the force of gravity mainly from the moon and secondarily from the sun as
Earth rotates on its axis. Which two of the following physical sciences MOST directly deal with the tides
and what causes them? - ✔✔physics and earth science
The statement, "The total energy in a closed system stays constant," is based on many years
of experimental observations. The statement is an example of a
. - ✔✔law
How does a hypothesis compare with a law? - ✔✔A law is supported by extensive evidence, but
a hypothesis has not been tested enough to be supported by extensive evidence yet.
Theories help scientists to: - ✔✔explain large amounts of data
Medical researchers want to be able to classify samples of cells by shape rapidly from the way light
shining on the cells from a laser is scattered into different directions. Why might they run a computer
program to calculate the scattering from different tiny egg-shaped particles for different lengths and
widths instead of doing the tests on real cells? - ✔✔The length, width, and height of the model
cells can be adjusted more easily than with real cells.
Someone hypothesizes that there are invisible beings living on Earth that cannot be detected by any
possible means. What is the BEST reason why the scientific community would be unlikely to plan a
scientific investigation to test the hypothesis? - ✔✔There is no conceivable way to prove the
hypothesis false.
Scientists discovered that the pressure, volume, and temperature of any gas are all related by a simple
mathematical equation, to a good approximation, according to all available evidence. The
mathematical equation giving this relationship is best described as a
. - ✔✔law
Which of these has values that are expressed in terms of derived SI units?
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