Agroup of students measured the density, the state of matter at 25 degrees celsius, reactions with water, and reactions to a flame and recorded the data in the table below: based on the results, what can be determined about the substances? options: a. all substances experienced a chemical change. b. argon did not experience a chemical change. c. only sodium experienced a chemical change. d. only hydrogen gas and sodium experienced a chemical change

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.

The best solution for preventing harm to people and pets from severe hurricanes involves determining and warning residents about what

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms