1. For which properties can a student design an investigation of the electrostatic forces between molecules in a substance?
A. melting point and boiling point, but not surface tension and vapor pressure
B. surface tension and vapor pressure, but not melting point and boiling point
C. boiling point, but not melting point, surface tension, or vapor pressure
D. melting point, boiling point, surface tension, and vapor pressure
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2. A student decides to conduct an investigation to determine the boiling points of water and ethanol. The student will heat samples of water and ethanol, and measure the temperature at which the samples boil. The student will conduct the investigation three times. Which aspect is missing from the experimental design?
A. determining what data to collect
B. deciding on the number of trials to perform
C. deciding on the appropriate equipment
D. determining the procedure
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3. Why is it important to conduct multiple trials of an investigation to determine the melting point of ice?
A. It lets scientists manipulate data to meet their needs.
B. It ensures that results are accurate.
C. It helps decrease human error.
D. It reduces the materials needed for the investigation.
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4. A student performs four trials of an investigation to determine the boiling point of water. How should the student handle the results?
A. The student should take the average of the minimum and maximum value of the results.
B. The student should use the value that is closest to 100ºC.
C. The student should use the maximum value of the results.
D. The student should take the average of the results from all four trials.
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5. To investigate electrostatic forces between molecules in water and in ethanol, a student pours identical amounts of the liquids into two identical beakers. The student then places objects of different weights in the beakers. Which characteristic is the student most likely testing?
A. melting point
B. boiling point
C. surface tension
D. vapor pressure
1)melting point, boiling point, surface tension, and vapor pressure
2)deciding on the appropriate equipment
3)Mix ice with water until equilibrium is reached but some ice remains that is no longer melting.
4)It ensures that results are accurate.
5)The student should take the average of the results from all four trials.
5. surface tension.
otherwise, Unknown is correct