Tightly bound group of atoms that behaves as a unit and carries a net charge is what?

Select all that apply. The discoveries of Niels Bohr were:

A sample of MgCO3•3H2O (magnesium carbonate trihydrate) is heated until 40.37 grams of water are released. How many grams did the original hydrate weigh?

Iron reacts with oxygen to form iron oxide (rust). Which best describes this statement? - Iron oxide is the liquid state of iron - Iron oxide is formed by rearranging atoms - Iron oxide is made up of only iron atoms

Describe what conditions exist in water molecules to make them dipolar.

Predict the molecular shape and give the approximate bond angle in the CO2 molecule. Multiple Choice linear, 180° O trigonal planar, 120 o tetrahedral, 109.5" trigonal pyramidal, 109.5" O bert, 1201

Which of the solutions below is a weak electrolyte? nacl (aq) koh (aq) hcl (aq) h2so3 (aq) all of these?

What is the gram formula mass of Ca (OH) 2

How much heat is absorbed by a 37g iron skillet when its temperature rises from 8oC to 24oC?

What chemical reaction occurs when an acid reacts with a base

Which of the following processes is spontaneous? A). building a house B). launching a satellite into orbit C). drops of dye dispersing in a clear solution D). cleaning your bedroom E). a ball rolling up a hill