Describe the three temperature scales used in the laboratory and in everyday life: the fahrenheit, celsius, and kelvin scales.

Explanation:

Fahrenheit Scale

Fahrenheit temperature scale is the scale which is based on:

(a) For freezing point of the water, 32 °F.

(b) For boiling point of the water, 212 °F.  

With interval between two being divided into equal 180 parts.

Celsius Scale

Celsius temperature scale is the scale which is based on:  

(a) For freezing point of the water, 0 °C

(b) For boiling point of the water, 100 °C.

With interval between two being divided into equal 100 parts.

Kelvin Scale

It denotes the triple point of water where the solid, liquid, and gas phases exist in equilibrium which is at 273.16 K.

kelvin is defined as 1/ 273.16 of triple point temperature.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.