Log inSign up

AP Chemistry Flashcards: Hesss Law

Study Hesss Law in AP Chemistry with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

What does Hess's Law state about enthalpy changes in chemical reactions?

Tap card or press Space to flip

ANSWER

Total enthalpy change is independent of the path taken. Enthalpy is a state function, dependent only on initial and final states.

1 / 36

AP Chemistry: Thermochemistry

You are hereHess's Law36 cards

All flashcards

36 cards

What this deck covers

This deck focuses on Hesss Law, giving you a quick way to review the definitions, rules, and examples that matter most for AP Chemistry.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Practice questions

1 of 27Practice questions for this set
Use Hess's law to determine ΔH\Delta H for: 2C(s)+3H2(g)→C2H6(g)\mathrm{2C(s) + 3H_2(g) \rightarrow C_2H_6(g)}. The following reactions are given:
  1. 2C(s)+2H2(g)→C2H4(g)\mathrm{2C(s) + 2H_2(g) \rightarrow C_2H_4(g)} ΔH=+52 kJ\Delta H = +52\ \mathrm{kJ}
  2. C2H4(g)+H2(g)→C2H6(g)\mathrm{C_2H_4(g) + H_2(g) \rightarrow C_2H_6(g)} ΔH=−149 kJ\Delta H = -149\ \mathrm{kJ}
Choose an answer

Keep your progress across every deck

Free account · cards you mark are saved to it