Which of these substances is not an element?

a. water

b. hydrogen

c. aluminum

d. iron

In order for a space shuttle to leave earth, it must produce a great amount of fuel. However, once in space, the shuttle needs very little fuel. It circles earth while gravity pulls it toward earth.

the constellation Orion appears in the eastern sky in December. Where would you expect it to appear in March, Why?

Are elements with similar chemical properties found in the same period or group on the periodic table? A. period B. group

If you were asked to convert 25 hg to the unit cg, which of the following would be the first fraction used in the conversion?

How do the interactions that are broken in water when it is boiled compare with those broken when water is electrolyzed? Boiling water breaks intermolecular attractions and electrolysis breaks covalent bonds.

Which of the following best describes what happens when an ionic bond forms? A) two atoms come together and share electrons in order to fill their octets. B) two atoms give up their electrons in order to form a bond.

Describe the attraction between 2 atoms as a result of sharing electrons

I need to know about mitosis and meiosis

What is sediment and debris, and what role does it play in the way sedimentary rock forms?

How do I convert 4,500mm to a m