What chemical change occurs when a more reactive substance replaces a less reactive substance in a compound?
a. oxidative
c. reduction
b. displacement
d. endothermic

Becquerel expected to find ( he developed the photographic plate that had sun-exposed minerals on top of it. becquerel expected to find ( he developed the photographic plate that had been in the closed drawer.

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

Which of these features are formed when hot groundwater is forced out through cracks in the earth's surface?