The early paleozoic dominated by

A. reptiles

B. amphibians

C. fish

D. inverterbrates

Among the elements of the main group, the first ionization energy increases a. from left to right across a period. b. from right to left across a period. c. when the atomic radius increases. d. down a group.

How many moles of each reactant are needed to produce 6.17 miles of HF (NH3) + F = (N2F4) + HF

How did the elements begin to stratify?

If you leave a solar powered flashlight in the sun for 8 hours, it will be able to stay lit for 3 hours. What would happen if you placed the flashlight under a bright light bulb for 8 hours?

Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Ca2+, V5+, Br-, S2-

To what chemical reaction class does this reaction belong? 2 mg (s) + o2 (g) 2 mgo (s)

Which best illustrates how particle arrangement changes when solids change into liquids

Express in scientific notation (6.0x10^4) (3.1x10^-1)

How do you measure the mass of a liquid?

Given the following information, calculate the mass for B-11. B-10 has a natural abundance of 19.9 percent, while B-11 has a natural abundance of 80.1 percent. The mass of B-10 is 10.013 amu.