Which statement tells an advantage for a single-celled organism?
a) it can reproduce quickly
b) it can become very large
c) it can tolerate all environmental conditions
d) it does not have to maintain its structure

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %