(4) write the chemical formulas for the following compounds.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

An atom that has gained or lost electrons is called an _

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill