A cylinder and an airtight piston are used in the following experiment. The pist
ID: 122212 • Letter: A
Question
A cylinder and an airtight piston are used in the following experiment. The piston is pushed up and down in the cylinder and the resulting pressure of the air inside the cylinder is measured with a pressure gauge. The results of the experiment are recorded in the following table: Volume of Air (L) Pressure Reading (Atm) 8 1 4 2 2 4 1 8 A hypothesis concerning the apparatus is stated as follows: "When the volume of the cylinder is decreased, the pressure is increased." Which of the following statements is true? The hypothesis is supported by the experimental data. The hypothesis is refuted by the experimental data. The hypothesis is not addressed by the experiment. There is not enough information to make a judgment about the hypothesis. Which of the following procedures is an appropriate negative control for testing the hypothesis that air contains bread mold spores? A. Seal slices of bread in a container to minimize air contact. Place slices of bread in a refrigerated environment. Add ingredients to the bread recipe that will slow mold growth. Expose a different mold-supporting medium to air. A researcher wants to develop a new pharmaceutical compound to treat pain. Which of the following strategies will likely be the most effective process? Test extracts from newly discovered plants for pain-killing substances. Read anthropological studies to discover plants identified to relieve pain. Study molecular structures of existing pain medications and make structural analogs. Research the pain receptors of people who have unusually high pain thresholds.Explanation / Answer
3. The hypothesis is supported by the experimental data.
As, on decreasing the volume by half, the pressure is getting doubled, i.e. there is an increase in pressure with decrease in volume.
4. A. Seal slices of bread in a container to minimize air contact
Sealing the slices will protect their contact with air and this will act as a negative control for testing the content of bread mold spores in air.
5. Study molecular structures of existing pain medications and make structural analogs.
Structural analogs will have good drug-receptor interaction to produce the pain killing activity.
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