Question

Thermochemistry is a branch of _________ concerned with heat changes of chemical reactions.
[A] Physical chemistry
[B] Organic chemistry
[C] Inorganic chemistry
[D] Analytical chemistry

Answer 1

Hint: To answer this, remember that thermochemistry is a branch of chemistry that deals with heat changes of a substance. Temperature is an intensive property of a matter and is the measurement of the degree to which a substance is hot or cold.

Complete answer:
To answer this question, let us discuss branches of chemistry briefly.
Chemistry is divided into five major branches namely organic, inorganic, physical, analytical and biochemistry. These branches are again divided into several sub-parts which we will discuss below-
Organic chemistry – It is the study of structures, properties and preparations of hydrocarbons. Organic chemistry includes-
- Medicinal chemistry
- Organometallic chemistry
- Polymer chemistry
- Physical organic chemistry
- Stereochemistry
Inorganic chemistry – It is the study of behaviour and properties of all other chemical compounds except those covered under organic chemistry. It includes crystal structures, minerals, metals and catalysts of the elements in the periodic table. It includes -
- Bio-inorganic chemistry
- Geochemistry
- Nuclear chemistry
- Organometallic chemistry
- Solid-state chemistry
Physical chemistry – It involves the study of the effect of chemical structures on certain physical properties of the substance. It basically includes the study of rate of chemical reactions, effect of radiation upon interaction of molecules etc. Physical chemistry includes-
- Photochemistry
- Thermochemistry
- Chemical kinetics
- Quantum chemistry
- Spectroscopy
Analytical chemistry – It includes the qualitative and quantitative determination of chemical compounds. It includes -
- Forensic chemistry
- Environmental chemistry
- Bio - analytical chemistry
Biochemistry – It is the study of chemical reactions that takes place in living organisms. Biochemistry includes-
- Molecular biology
- Genetic
- Pharmacology
- Clinical biochemistry
- Agricultural biochemistry
We can understand from the above discussion that thermochemistry is a branch of chemistry which is dealt under physical chemistry.

Therefore, the correct answer is option [A] Physical chemistry.

Note:
In the above discussion, we have discussed the five main branches of chemistry but there are many other sub-branches and possibilities in this subject. Chemistry is the central science as there is between chemistry with other disciplines like biology, physics, medicine, geology etc.
Thermochemistry is basically a part of thermodynamics that focuses on heat absorbed or released during a chemical reaction.