Question

go online to explore and explain the thermodynamics of a reaction in a bag and to find where california gets its energy. a conceptual model of energy energy is itself a conceptual model, because energy isnt a physical thing. you cant see it or touch it. as energy flows between systems, changing form in many different ways, you can model it as a substance that can be quantified and must be conserved, but in fact, it is only conceptual. water flows down rivers and through hydroelectric dams, doing work along the way such as eroding river banks or generating electricity. electricity in the form of electrons flows through electric circuits, doing work such as turning on lights or televisions. but moving electrons are not themselves energy; they just carry the energy. similarly, chemical equations describe the energy involved with changes in the composition, state, or phase of materials, but you can only see the reactants and products. you never see the energy itself. mechanical potential energy a hammer raised by a cam on a turning wheel gains gravitational potential energy. when it drops, potential energy is converted to kinetic energy. as the cam turns, it lifts and drops the hammer repeatedly. you can see evidence that the hammer has energy when the kinetic energy of the hammer does work in shaping a piece of metal. chemical potential energy molecules are held together by chemical bonds, which form through the electrical attraction between protons and electrons. potential energy is stored in the relative distances between atoms. when bonds break and distances change, chemical potential energy is converted into kinetic energy. 12 ccc energy and matter underline and identify the parts of the text on this page that use examples of how the flow of matter through a system is driven by energy and can do work.

Explanation:

The text mentions water flowing down rivers and through hydro - electric dams doing work like eroding river banks or generating electricity. Also, the kinetic energy of a hammer shaping a piece of metal shows work being done. These are examples of how the flow of matter through a system (water, hammer) is driven by energy and can do work.

Answer:

"Water flows down rivers and through hydroelectric dams, doing work such as eroding river banks or generating electricity." and "You can see evidence that the hammer has energy when the kinetic energy of the hammer does work in shaping a piece of metal."