exam 1 material Flashcards
when scientists generate a single informed, logical and plausible explanation for a question and observations of the natural world, they are proposing a scientific
hypothesis
a scientific hypothesis must be___;if not, science cannot evaluate it
testable
a scientific hypothesis must be constructed with which of the following characteristics
provides a reasonable explanation to a question and is consistent with current observations;it must also be testable and falsifiable
is it important for scientists to undergo peer review of their results by fellow scientists
yes. the quality and accuracy of the scientific work can be enhanced by input, further review, and possibly even repetition by other scientists working in the same field
what could not be used to develop a testable hypothesis
do ghosts impact how children sleep
some questions fall outside the realm of science. which could not be answered using the scientific method
why is it unethical to test newly developed drugs in animals
david blehert and his research team had 117 healthy bats to study in the lab and divided them into 4 groups. group 1 was housed in an area free from Geomyces destructoans known to cause white nose syndrome. group 2 was in an area that shared same air as bats infected with WNS, but did not have direct contact with the infected bats. group 3 was in direct contact wth other WNS bats. Group 4 directly exposed to Geo. dest. when it was applied to their wings. during the study period, the bats were monitored for signs of wns. what were independent and dependent variables
independent variable=type of exposure to geomyces destructans
dependent variable=whether or not bats became sick with WNS
scientists are human and susceptible to personal and group biases that may influence how they interpret evidence. before original research work is accepted and added to a growing body of scientific understanding, perhaps even contributing to our understanding of an important scientific theory, it must be scrutinized by experts in the field who have no direct connection to the research under review. the main mechanism for doing this is
peer reviewed publications
scientific understanding can always be challenged, and even changed, with new ways of observing and with different interpretations
scientific knowledge can change given increased knowledge
carbon, hydrogen, and nitrogen are all examples of
elements
central element found in organic molecules
carbon
a group of astronauts returning from outer space studied samples taken from their lunar landing. they found that one of their samples was coated with organic compounds. which of the following statements must be correct about their samples
the samples must contain carbon atoms
in the chemical reaction that forms water, hydrogen, ad oxygen share electrons creating __ bonds between the 2 atoms
covalent
which of the following explains why ice floats on water
the distance between water molecules in ice is greater than in liquid water
oil and water don’t mix together well because
water is polar and oil is nonpolar