The enthalpy diagram to the right represents a set of thermochemical equations. Which set of equations could it represent? A + B Right arrow. C Delta. H1 = - 500 kJ C + D Right arrow. E + 2F Delta. H2 = 100 kJ F + D Right arrow. B Delta. H3 = 200 kJ A + B Right arrow. C Delta. H1 = 800 kJ C + D Right arrow. E + 2F Delta. H2 = - 200 kJ F + D Right arrow. B Delta. H3 = - 300 kJ A + D Right arrow. E Delta. H1 = 500 kJ D Right arrow. F Delta. H2 = - 300 kJ

the formula for the conversion of temperature from degree celsius to kelvin is:

the sample of water at is converted to kelvin temperature by using the above formula as:

on comparing the two samples of water at or we can say that at and at respectively. the difference between the temperatures of two samples of water is:

hence, one can say that the sample of water at is greater than the sample of water at by .

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.

they are called fossil fuels

answer: option (a) is the correct answer.

explanation:

the measurement of hydrogen ions in a solution is known as ph.

if ph of a solution is less than 7 then the solution is acidic. if ph of a solution is greater than 7 then the solution is basic.

when the ph of a solution equals 7, then the solution is considered as neutral.

the ph of pure water is 7, therefore, it means that concentration of hydronium ions equals that of hydroxide ions.