10 Questions
Which type of energy is stored in the chemical bonds of a substance?
Chemical energy
What is the energy required to break the bonds in the reactants for a chemical reaction to occur?
Activation energy
How is a reaction classified if more energy is released than supplied?
Exothermic
Which type of reaction involves more energy being absorbed than released?
Endothermic
What type of energy change is involved in exothermic reactions?
Heat release
Which type of reaction results in the products feeling cold?
Endothermic
What is the state function in thermodynamics related to the energy of a system?
Internal energy (U)
Which type of energy is associated with random molecular motion and is generally proportional to temperature?
Thermal Energy
Which type of reaction results in the products feeling hot?
Exothermic
Which quantity of heat is required to change the temperature of one gram of water by one degree?
Calorie
Study Notes
Chemical Reactions and Energy
- Chemical energy is stored in the chemical bonds of a substance.
Activation Energy
- Activation energy is the energy required to break the bonds in the reactants for a chemical reaction to occur.
Reaction Classification
- If more energy is released than supplied in a reaction, it is classified as exothermic.
- If more energy is absorbed than released in a reaction, it is classified as endothermic.
Energy Changes in Reactions
- Exothermic reactions involve a release of energy.
- Endothermic reactions involve an absorption of energy.
- In exothermic reactions, the products feel hot due to the release of energy.
- In endothermic reactions, the products feel cold due to the absorption of energy.
Thermodynamics
- The state function in thermodynamics related to the energy of a system is called internal energy (U).
- Kinetic energy is associated with random molecular motion and is generally proportional to temperature.
Heat and Temperature
- One calorie is the quantity of heat required to change the temperature of one gram of water by one degree.
Test your knowledge about energy and chemical reactions, including concepts like chemical energy, activation energy, endothermic and exothermic reactions. Explore the energy changes involved in making and breaking chemical bonds.
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