A physical change can be described as a change that doesn't affect the chemical composition of the substance; while a chemical change does alter the chemical composition of the substance. Place the
following examples under the correct heading that describes the change that occurs.
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a raw egg is fried
change in shape or phase
ice melting
matter is conserved
nitrogen gas and hydrogen gas combine
and form ammonia
rusting of a nail

In a system, when potential energy decreases, then entropy also decreases. true false

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?

Wave functions describe orbitals in a hydrogen atom. each function is characterized by 3 quantum numbers: n, l, and ml. if the value of n = 2: the quantum number l can have values from to . the total number of orbitals possible at the n = 2 energy level is .