What is the percent hydrogen in ammonium sulfide

Iron + sulfur - iron (II) sulfide

In which list are the elements arranged in order of increasing atomic mass? A) CI, K, Ar B) Fe, Co, Ni C) Te, I, Xe D) NE, F, Na

Write complete ionic and net ionic equations for the reaction between sulfuric acid (H2SO4) and calcium carbonate (CaCO3). H2SO4 (aq) + CaCO3 (s) - > H2O (I) + CO2 (g) + CaSO4 (aq)

Which substance has the lowest amount of hydrogen ions? stomach fluid vinegar coffee Household bleach

I don't understand periodic trends for ionization energy and atomic radius.

For which kingdom would you most likely need a magnifying lens or microscope to study the organisms

How can indicator be used to determine if a solution is an acid or base

A student blows up a ballon and then places it in a very cold freezer the ballon shrunk after hours why?!

if the temperature of 800.0 g h2O increases by 45 degree c how much heat (in joules and in calories) was added to the water?

Mrs. Smith's sixth grade science class conducted a class project on the effects of UV-B radiation on salamanders. The class designed and performed an experiment testing the effects of UV-B on salamander egg hatching success.