Which of the following statements is true?

a. the boiling and condensation points of a substance are the same.
b. the melting and boiling points of a substance are the same.
c. the freezing and boiling points of a substance are the same.
d. the heat of fusion for a substance is the energy required to change from the vapor to plasma phase.

A. The boiling and condensation points of a substance are the same

Explanation:

The boiling point of a substance is the temperature at which it changes from liquid to gas while the point at which a substance changes from gas to liquid is called its condensation point. As long as a substance is pure, it condenses at the same point at which it boils.

Pure water for example has a condensation point and boiling point of 100 degrees Celsius.

chemical properties of thing

-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

hope this