What are the two different types of Barometers?

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Barometers are categorized into two classes: mercury and aneroid. Atmospheric pressure balances a column of mercury in the mercury barometer, the height of which can be precisely measured.

<h3>How do we make use of the barometer?</h3>

Meteorologists use barometers to forecast short-term weather changes. A rapid drop in atmospheric pressure indicates the arrival of a low-pressure system.
Low pressure indicates that there is insufficient force or pressure to push clouds or storms away.
Simply put, a barometer functions as a balance, weighing the weight of the atmosphere (or air around you) against the weight of a mercury column.
The temperature will rise if the air pressure is high. The mercury drops when the air pressure is low.
While placing your barometer against an inside or outside wall will not affect its performance, placing it too close to a heat source may.
Place your barometer away from a heating vent and away from direct sunlight. This is especially important if your barometer doubles as a thermometer.

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Correctly classify each of the following compound as highly soluble or insoluble in water. 1. NaCl 2. CH3Cl 3. CH3OH 4. KOH 5. C

Anna35 [415]

There are solubility rules for inorganic compounds in water as shown in the picture attached. For organic compounds, we use the concept of polarity.

1. NaCl: Since NaCl is a chloride and Na is not included in the list of insoluble, therefore, NaCl is highly soluble.

2. CH₃Cl: This compound is organic. Since the electonegativity between C and Cl is great, it tends to be polar. Because water is also polar, this is highly soluble.

3. CH₃OH: This is an alcohol. Alcohols with short chains of hydrocarbon are highly soluble in water because of hydrogen bonding (-OH).

4. KOH: From the table, KOH is highly soluble. In fact, this is a strong solid which readily dissociates in water.

5. C₆H₆ is the benzene ring. This is a nonpolar molecule, so you would expect this to be insoluble with water.

6. C₆H₁₄ is hexane which is a long chain of hydrocarbons. Because there is no point of hydrogen bonding, this is nonpolar, and therefore, insoluble in water.

7. KNO₃ is highly soluble because all nitrates are soluble.

8. CCl₄ is an organic compound. Individually, C-Cl bonds are polar. But because there are 4 of them, they cancel out. As a result, there is a balance of partial charges which makes it nonpolar. Thus, this is insoluble in water.

9. NaSO₄: from the table, this is highly soluble.

10. CH₃CH₂OH: Although it is composed of the nonpolar hydrocarbon chain, the OH group is much stronger such that it is highly soluble in water.

11. CH₂Cl₂: This is polar because there is an imbalance due to the C-H and C-Cl bonds. Thus, it is highly soluble in water.

12. CH₃COOH is a carboxylic acid which is even more soluble than alcohols. Thus, this is highly soluble in water.