Biology, 15.04.2021 16:50 dianaosorio33895
Cold packs can be used to treat sprained ankles and similar injuries. A cold pack is activated by breaking a barrier within the the pack, allowing the chemicals inside to mix. The process that occurs is endothermic, meaning it absorbs heat and leaves the pack feeling cold, as shown in the diagram below.
A group of students wants to create their own cold pack, so they did an experiment using four different solutes to see which one would be best. To determine which solute would be best, the students mixed 20 g of each solute into separate containers that each held 50 mL of 24°C water. The students then recorded the temperature changes in each container. The data table below shows the maximum and minimum temperatures they obtained for each solute, as well as the temperature difference.
Maximum Temperature (°C) Minimum Temperature (°C) Temperature Difference (°C)
Ammonium chloride (NH4Cl) 24 1 23
Calcium chloride (CaCl2) 60 24 36
Sodium acetate (CH3COONa) 55 24 31
Sodium chloride (NaCl) 24 22 2
According to the students' data, which solute should they use in their cold pack?
A.
ammonium chloride
B.
sodium acetate
C.
sodium chloride
D.
calcium chloride
Answers: 2
Biology, 21.06.2019 14:00
How do environmental factors influence genetic traits? a. environmental factors determine all genetic traits. b. environmental factors can determine if a genetic trait becomes a health issue. c. environmental factors are determined by genetic traits. d. environmental factors have no influence on genetic traits. select the best answer from the choices provided
Answers: 3
Biology, 21.06.2019 14:00
Which of the following statements best describes the relationship between the environment and human health? a. the environment is the only factor that affects human health. b. many aspects of the environment can have an impact on human health. c. human health is impacted by changes in climate. d. the environment has no impact on human health. select the best answer from the choices provided
Answers: 2
Biology, 21.06.2019 22:00
Ry was studying two populations of the same species of lizards. one population lived on an island and the other lived on the mainland. both populations were affected by a hurricane that hit the island and the mainland with equal force. a year later, henry was testing the gene frequency and saw a decrease in genetic variation in the island species, but not in the mainland species. which best describes a conclusion he might have reached? gene flow greatly affects small populations, but large populations can recover. genetic drift greatly affects small populations, but large populations can recover. gene flow greatly affects large populations, but small populations can recover. genetic drift greatly affects large populations, but small populations can recover.
Answers: 2
Cold packs can be used to treat sprained ankles and similar injuries. A cold pack is activated by br...
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