What is the energy transformation that occurs when a log burns?
In the case of burning wood, stored potential energy (in the form of chemical energy) in the log is released due to heating by other excited atoms. This chemical reaction is called combustion and requires oxygen. Combustion changes the potential chemical energy into kinetic energy in the form of heat.
Which best describes the change in energy that takes place as a log of wood burns?
Which best describes the change in energy that takes place as a log of wood burns? … The chemical potential energy in the log of wood decreases.
Which best describes energy changes in a system?
Which best describes energy changes in a system? … Energy is not conserved, but it cannot be created or destroyed. Energy is conserved, and it cannot be created or destroyed.
When you make a campfire What you see is the result of energy transformations?
When you burn wood in a campfire, chemical energy is converted to heat and light energy. In a computer monitor, electrical energy is transformed into light energy and sound energy.
How much energy is in a log?
A standard cord of well-seasoned hardwood (stack of wood 4’X 4’X 8′ or 128 cubic feet) contains the heat equivalent of about 20 million BTU’s. By way of comparison this is more or less equivalent to the heat value in 145 gallons of #2 fuel oil or 215 gallons of LP gas.
What are two forms of energy that are released when wood is burned?
So to summarize: Burning wood is an exothermic reaction which turns the chemical potential energy stored in the cellulose into heat energy (and light). The most notable changes are the release of heat to the surroundings and the breakdown of the wood to form water vapor and carbon dioxide.
Is endothermic positive or negative?
If a reaction absorbs or uses more energy than it releases, the reaction is endothermic, and enthalpy will be positive.
How do we detect the change in energy?
By comparing the energy used when bonds in the reactants are broken with the energy released when bonds in the products are formed, you can determine whether a chemical reaction releases energy or absorbs energy overall.
What type of reaction takes in energy?
Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products.