Question

Water has a relatively high heat of vaporization. This allows water to absorb a lot of heat before changing temperature. This effect helps moderate earth's climate Select one: True O False Increased CO2 in the atmosphere is adding to global climate change increase CO2 is also creating more carbonic acid leading to ocean acidification - a big threat to coral reefs Select one True stion False 4

Answer 1

1. Water has high heat of vaporization. This is because it has lot of hydrogen bonds and to break these bonds, it requires lot of heat. Once the hydrogen bonds are broken, water will become vapour. This property of water helps in keeping the climate of the earth constant.

It is TRUE.

2. Increased CO2 in the air is leading to ocean acidification. It is TRUE. because, CO2 which is dissolving excessively in water, forms H2CO3 (carbonic acid). This carbonic acid dissociates to form H+ and HCO3- ions. Increased H+ ions in the ocean waters results in acidification of the waters.

3. Addition of methyl group to a hydrocarbon does not make it more polar. A methyl molecule has C and 3 H atoms which can't form any bonds with water. So it is non-polar.

It is FALSE statement.

4. Hydrogen bonds with in the molecule influences the shape of the molecule. As in the case of proteins, the polypeptide molecule develops many hydrogen bonds between hydrogen and any electronegative atom in the molecule to give secondary or tertiary structure to the polypeptide making it functional protein.

It is TRUE statement.