19. balance the following chemical equation: fe + o2 → fe2o3 what is the coefficient on fe, o2 and fe2o3? *

a. 1, 2, 3

b. 4, 3, 2

c. 1, 3, 1

d. 2, 1, 1

20. the law of conservation of mass lets us know that in every chemical equation you have to have the same number of on both sides of the equation. *

a. moles

b. coefficients

c. atoms of each element

d. molecules

Fossil fuels are organic compounds that are made from

Essay-alternative energy sources research sources of energy that are being developed. write a report of 350-400 words discussing the information you learned concerning the development of various energy sources and the impact that you think they will have on your life. include sources cited at the end of your report using the mla format. follow the rubric guidelines. note that wikipedia is not an appropriate resource for a research paper. worth 99

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent