Which of the following intermolecular forces plays a pivotal role in the unique properties of water? a. dipole-dipole force. b. ion-dipole force. c. hydrogen bonding. d. dispersion force. c. hydrogen bonding

Correct answer choice is :

C) Hydrogen bonding

Explanation:

A hydrogen bond is a partly electrostatic tendency in a hydrogen which is bound to a more electronegative atom such as nitrogen, oxygen, or fluorine, and another nearby atom having a lone pair of electrons. Hydrogen bonds can happen within molecules or within various parts of a single molecule. Depending on the nature of the giver and acceptor atoms which compose the bond, their geometry, and atmosphere, the energy of a hydrogen bond can differ between 1 and 40 kcal/mol.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

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