1. a scientist wants to find out why sea water freezes at a lower temperature than fresh water.
2. the scientist goes to the library and reads a number of articles about the physical properties of solutions.
3. the scientist also reads about the composition of sea water.
4. the scientist travels to a nearby beach and observes the conditions there. the scientist notes that taste of the sea water and other factors such as waves, wind, air pressure, temperature, and humidity.
5. after considering all this information, the scientist sits at a desk and writes, "if sea water has salt in it, it will freeze at a lower temperature than fresh water.
6. the scientist goes back to the laboratory and does the following:
a. fills each of two beakers with 1 liter of fresh water.
b dissolves 35 grams of table salt in one of the beakers.
c.places both beakers in a freezer at a temperature of -1 C.
d. leaves the breakers in the freezer for 24 hours.
7. after 24 hours, the scientist examines both breakers and find the fresh water to be frozen. the salt water is still liquid.
8. the scientist writes in a notebook, "it appears that salt water freezes at a lower temperature than fresh water does."
. the scientist continues, "i suggest that the reason salt water freezes at a lower temperature is that sea water contains dissolved salts, while fresh water does not."
questions
a. which statement(s) contain conclusions?
b. which statement(s) contains a hypothesis?
c. which statement(s) contain observations?
d. which statement(s) describe an experiment?
e. in which statement is the problem described?
f. which statement(s) contain data?
g. which is the manipulated variable in the experiment?
h. what is the responding variable in the experiment?