Which of the following does not happen during a chemical change?

the identities of the substances change.
bonds are broken and new bonds are formed.
some atoms disappear as energy is released.
compounds are broken down and/or formed.

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

An experimental procedure requires a 10 ml of acid to be dissolved