The Theory of Continental Drift says that the continents were once joined together and are drifting apart. Who is given credit for coming up with this theory?
Charles Darwin
Alfred Wegener
Marie Curie
Alfred Wallace

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.