What is enthalpy?

Enthalpy (given the symbol H) is a measure of how much heat energy can be released by a chemical. ΔH is defined as the amount of heat energy released or taken in when two chemicals react. If ΔH is negative it means that the reaction is exothermic and will give out heat as it progresses and will feel hot.

If ΔH is positive then the reaction is endothermic and will therefore absorb heat as it progresses, and will feel cold.

Answered by Chris M. Chemistry tutor

6360 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

Write down the electronic configuration of a copper ion in this complex ion: [Cu(H2O)6]2+


At room temperature and pressure, the first 4 alkanes are all gases, but the first 4 alcohols are all liquids. Explain this.


3-methyl pent 2 ene reacts with HBr to form two products. Which of these products is the minor and major product and why?


2-chloropropanoic acid has a Ka of 1.48E-3. Write an expression for Ka and hence or otherwise, calculate the pH of a 0.35M solution of 2-chloropropanoic acid


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences