5 Questions
True or false: The First Law of Thermodynamics states that energy cannot be created or destroyed, only transformed from one form to another.
True
True or false: An exothermic reaction is a chemical reaction that absorbs energy from the surroundings.
False
True or false: Boiling of water is an example of an endothermic process because it requires energy to convert liquid water to gas.
True
True or false: Photosynthesis is an example of an exothermic process because it releases energy.
False
True or false: The change in enthalpy of a reaction can be calculated using Hess's Law.
True
Study Notes
Thermochemistry and Energy Changes
- Physical and chemical changes are accompanied by energy changes.
- Energy is released or absorbed during these changes.
First Law of Thermodynamics
- The law explains the concept of energy conversion and conservation.
Types of Chemical Reactions
-
Exothermic Reactions: Energy is released to the surroundings during a chemical change.
- Example: Condensation (gas to liquid), energy is released to form bonds.
-
Endothermic Reactions: Energy is absorbed from the surroundings during a chemical change.
- Example: Boiling (liquid to gas), energy is absorbed to break bonds.
Interconversion of Energy
- Chemical to Electrical Energy: Energy conversion in batteries.
- Energy can be converted from one form to another.
Test your knowledge of thermochemistry in this quiz. Explore the First Law of Thermodynamics, enthalpy of a reaction, and calculations using Hess Law. Dive into the energy changes accompanying physical and chemical changes.
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