2. A chemical reaction occurs when substances interact and their atoms O A. disappear
B. change their size.
C. become new atoms.
O D. rearrange

If the element whose electric configuration ends in the d sublevel, the element is calssified as? a.inner transition b.noble gases c.representative d. transition

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

The boiling point of propanoic acid is higher than that of 1-butanol because: propanoic acid has a higher molecular weight than 1-butanol. propanoic acid is more soluble in water than 1-butanol. propanoic acid is a better hydrogen bond donor than 1-butanol. propanoic acid forms hydrogen bonded dimers and 1-butanol does not. 1-butanol forms hydrogen bonded dimers and propanoic acid does not.