Name the element that is an alkaline earth metal in period 6.
Cs
Ba
Au
Hg
Sr

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Silver reacts with oxygen to produce silver oxide. (write balanced chemical equation and identify type of chemical reaction.)

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost