Which of the following molecules is more soluble in water: acetone, acetic acid, diethyl ether or hexane? Justify your selection with an argument based on intermolecular forces.

Acetic acid.

Explanation:

Hexane which is a member of the alkane group is not soluble in water.

This is because individual water molecules do not form hydrogen bonds with the hydrogen present. Also as the chain (number of carbon atoms), increase, the solubiluty decreases)

Carboxylic acids of low molar mass are quite soluble in water. Acetic acid ehich is a member of the carboxylic acids form hydrogen bonds with its 2 oxygen atoms and also its hydrogen atom each with different individual molecules of water.

Ether is non-polar. Ethers are very slightly soluble in water at around 6.8g/100g. This is due to the presence of oxygen in ethers which interact with hydrogen in water to produce H-bonding to make it slightly soluble.

why is cellular respiration important for homeostasis?

it changes food into energy that the organism can use.

which of the following is most likely to happen if a cell is not able to divide?

the cell will not be replaced when it is damaged.

explanation:

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.