1.) how can people reduce their exposure to bpa? 2.) should bpa be kept out of products that people frequently use? why or why not?

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium