Chemistry- Unit 2 Review

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Explain why the alcohol level in a thermometer rises when it is placed in a warmer fluid. (3-step process)
1.) Energy from the warmer fluid is transferred to the alcohol in the thermometer. 2.) This energy causes the alcohol molecules to move faster. 3.) The alcohol molecules move further apart and this expansion is noted by alcohol rising in the tube.
Explain why the alcohol level in a thermometer falls when it is placed in a cooler fluid. (3-step process)
1.) Energy from the thermometer is transferred in the cooler fluid. 2.) This transfer of energy causes the alcohol molecules to slow down. 3.) The alcohol molecules move closer together so that the height of the alcohol in the tube decreases.
Explain how the Celsius scale was devised and why it is not appropriate to use it when describing the behavior of gases.
Anders Celsius used a tube of mercury, marking the height of the mercury column when he placed the tube in an ice bath at 0c; he placed it in boiling water bath and called that 100c. He marked it literally between 0 and 100c.
Explain (in terms of the collisions of particles) why the change has the affect you predicted.
If the volume decreases, the gas particles don't have as far to collide with the walls of the container so there are more collisions with the walls. A higher temperature also increases the pressure because the faster moving particles will collide more often with the walls of the container. At constant P, increasing the temperature will cause an increase in volume, because the particles are moving faster and away from each other causing an expansion.
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