How much energy is required to heat 250.g of aluminum from 25.0 °C to 225 °C? The specific heat of aluminum is 0.900 J/g °C.

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

16- counting by fours

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."