Decide whether each of the following statements is true or false. If false, rewrite the sentence to make it true. Explain in complete sentences why you had to change the false statements. a. An exothermic reaction will always be a spontaneous reaction. b. Reactions with a positive Δ�!"# ° and a positive Δ�!"# ° can never be product-favored. c. The entropy of a substance increases when changing from the liquid to the vapor state at any temperature. d. Reactions with a negative Δ�!"# ° and a negative Δ�!"# ° are spontaneous at any temperature.

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

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