Why is it incorrect to refer to a molecule of sodium chloride? a. Because sodium and chloride are not bonded together in any way. b. Because ionic compounds do not exist in discrete molecules--they exist in crystal lattices. c. Because molecules are not a meaningful term in chemistry. d. Because sodium chloride is not a compound found in nature.

B. Because ionic compounds do not exist in discrete molecules -- they exist in crystal lattices.

Explanation:

A property of ionic compounds is that they form crystal lattice structures. Ionic compounds are crystals of many cations and anions bonded together. There is no molecule of ionic compounds because there is no single unit of the compound.

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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.

d

explanation: