Question

Students Name and ID: Read the following story and then answer the questions. A scientist wants to find out why sea water freezes at a lower temperature than fresh water. The scientist goes to the library and reads a number of articles about the physical properties of solutions. The scientist also reads about the composition of sea water. The scientist travels to a nearby beach and observes the conditions there. The scientist notes the taste of sea water and other factors such as waves, wind, air pressure, temperature, and humidity. 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." The scientist goes 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 lºc d. Leaves the beakers in a freezer for 24 hours. After 24 hours, the scientist examines both beakers and fins the fresh water to be frozen. The salt water is still a liquid. The scientist writes in a notebook, "It appears that salt water freezes at a lower temperature than fresh water." The scientist continues, "I suggest that the reason sea water freezes at a lower temperature is that sea water contains dissolved salts, while fresh water does not." Questions: You may have more than one answer Which statement(s) contain conclusions? 2. Which statement(s) contains a hypothesis? 3. Which statement(s) contain observations?

Answer 1

Due to HomeworkLib policy we are not allowed to solve more than 4 questions at a time. Hope you will understand my situation. Thanks.

- (1) conclusion containing statements are (a) salt water freezes at lower temperature than fresh water (b) sea water freezes at a lower temperature because sea water contain dessolved salt , while fresh water does not . (2) hypothesis statement : I of sea water has salt un it, it will freue at a lower temp. than fresh water. (3) Observation Statements: After 24 hours, the scientist examines both beakers and finds the fresh water to be frozen. The salt water is still a liquid (4) statements describes an experiment: (a) Fills each of two beaker with 1 liter of fresh water. (6) Dissolve 35 grams of table salts in one of the beaker. (c) place both beakers in a freezer at a temperature of 18 (d) Leave the beaker in a freezer for 24 hours.