Chem2

Question 1 (1 point)

In which temperature scale does a 1 degree rise represent the smallest temperature change?

Question 1 options:

	The Fahrenheit scale.
	All of the degrees are equivalent in magnitude.
	The Celsius scale.
	The Kelvin scale.

Question 2 (1 point)

In a thermocouple, two dissimilar metals are in intimate contact, creating a potential difference (or voltage).  How does this voltage vary with temperature?

Question 2 options:

	Exponentially.
	The voltage does not change with temperature.
	Logarithmically.
	Linearly.

Question 3 (1 point)

In this experiment, an ice bath is used to determine the temperature at the freezing poitn of water.  Where should the probe be placed for this measurement?

Question 3 options:

	Immersed in the ice bath, but without the probe contacting the beaker.
	Well above the surface of the beaker.
	Above the surface of the ice bath.

Question 4 (1 point)

In today's experiment a boiling water bath is used to measure temperature. Where should the probe tip be placed to measure the best temperature?

Question 4 options:

	It should be just above the surface of the water.
	It should be well above the top of the flask.
	It should be completely immersed in the boiling water.

Question 5 (1 point)

In this experiment, water will be heated to its boiling point in order to determine this temperature at the experimental conditions.  What precautions need to be observed during this measurement?

Question 5 options:

	2 or 3 boiling chips must be added to the water bath to allow bubbles to form and prevent irregular boiling.
	After the heating is done, the beaker should be left on top of the hot plate until it is cool.  When judging if the beaker is cool enough to handle, it is best to slowly bring the back of the hand toward the beaker to feel if it is still hot or not.
	Both of the above precautions must be taken.

Question 6 (1 point)

You are given an uncalibrated thermometer to calibrate. You place the thermometer in an ice bath and make a mark at the level of the mercury column. You then place the thermometer into a boiling water bath and make another mark. With a ruler your determine that the marks are 128 mm apart. Calculate the melting point of a substance in oC that is found to melt at 60 mm above the lower mark.

Enter your answer in the space provided below as a decimal number to 1 decimal place. (Units are Celsius degrees - you may leave that box blank.)

Your Answer: