Energy
Definition
Energy refers to the capacity of a system to do work or produce heat. In chemical reactions, energy can be released (exothermic) or absorbed (endothermic).
Analogy
Think of energy as fuel for your car. Reactions that release energy are like driving downhill, while reactions that absorb energy are like driving uphill.
Related terms
Activation Energy: The minimum amount of energy required for molecules to undergo a chemical reaction.
Enthalpy Change (∆H): The difference in heat content between reactants and products in a chemical reaction.
Calorimetry: A technique used to measure heat changes during chemical reactions.
"Energy" appears in:
Subjects (2)
Practice Questions (7)
Given water's specific heat capacity is 4.184 J/g°C, how much energy does it take to heat up 100. g of water from 0 degrees to just boiling?
Given the following data about water: ∆Hfus = 334 J/g, ∆Hvap = 2260 J/g. How much energy does the reaction release when converting 36g of liquid water to solid ice?
What is the wavelength of a photon that has an energy of 1.55x10^-19 J?
What color of light has the greatest energy per photon?
When a photon is absorbed by a molecule, the energy of the species is ______ by an amount ______ the energy of the photon.
Calculate the energy of a gamma ray photon whose frequency is 5.02x10^20 Hz.
The equilibrium constant for a reaction at a specified temperature is found to be 1.8*10^5, and energy is released when the reaction occurs. Which of the following will allow for the reactants to be favored?
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