1.When an exothermic phase change occurs, such as freezing water into ice crystals, where does the energy released go?
my answer: into the surroundings and the environment
2.When a flashlight battery runs out of energy (charge) does that mean the energy has been destroyed? Why or why not?
my answer:
energy is neither created nor destroyed, it just changes form, from chemical energy to electrical energy, and then electrical back to chemical, over and over again.
3.Describe what happens on the molecular level when hot water is poured over ice to melt it.
my answer: When hot water molecules collide with ice molecules, they transfer energy to the ice. This causes the ice molecules to vibrate. If they vibrate hard enough, they will break the bonds keeping them in the ice crystal and become liquid water.
4. Explain why wood insulates and metal conducts heat energy.
My answer: the molecules in the wood were bonded together when the tree was alive and producing new wood. The wood molecules are not free to bump into each other with the same energy of collision that the metal atoms in the fork have. The wood molecules are not able to transfer as much energy and so do not get as hot.
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