One way to get more energy out of fuels is to increase the percentage of energy used for work.

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope