Hess's Law Worksheet
This worksheet covers Hess's Law, including calculations of enthalpy changes for chemical reactions using Hess's Law and understanding its applications.
Includes
Standards
Topics
Hess's Law Worksheet
Name:
Date:
Score:
Read each question carefully and answer to the best of your ability. Show all your work for calculation problems.
1. Hess's Law states that the enthalpy change of an overall reaction is equal to the sum of the enthalpy changes of individual steps. This is based on the principle of:
Conservation of mass
Conservation of energy
Le Chatelier's Principle
Avogadro's Law
2. Hess's Law is particularly useful for calculating enthalpy changes of reactions that are difficult or impossible to measure .
3. When a chemical equation is reversed, the sign of the enthalpy change (ΔH) must be .
4. Explain why Hess's Law is valid.
5. According to Hess's Law, the path taken from reactants to products affects the overall enthalpy change.
True
False
6. Calculate the enthalpy change (ΔH) for the reaction: C(s) + 2H2(g) → CH4(g)
Given the following reactions:
I. C(s) + O2(g) → CO2(g) ; ΔH = -393.5 kJ/mol
II. H2(g) + 1/2 O2(g) → H2O(l) ; ΔH = -285.8 kJ/mol
III. CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ; ΔH = -890.3 kJ/mol
Related Worksheets
Ions and Formula Units Worksheet
Explore the formation of ions, ionic bonds, and the naming and writing of chemical formulas for ionic compounds at a Grade 10 level.
Actual Yield in Chemical Reactions
Explore the concept of actual yield, theoretical yield, and percentage yield in chemical reactions with this Grade 10 chemistry worksheet.
Exploring Salts: Properties and Reactions
This worksheet covers the properties, formation, and uses of various salts, including their role in everyday life and chemical reactions.
Relative Mass Worksheet
Explore the concepts of relative atomic mass, relative molecular mass, and isotopic abundance in this Grade 10 chemistry worksheet.
Solubility Curves Worksheet
This worksheet explores solubility curves, their interpretation, and how they represent the relationship between temperature and the solubility of substances.
Predicting Products of Chemical Reactions
Grade 10 Science worksheet focusing on predicting the products of various types of chemical reactions, including synthesis, decomposition, single displacement, double displacement, and combustion.
Band of Stability Worksheet
Explore the concept of the band of stability, nuclear forces, and radioactive decay with this Grade 10 chemistry worksheet.
Electron Dot Diagrams Worksheet
A Grade 10 Science worksheet covering electron dot diagrams, valence electrons, and their importance in chemical bonding.