How many oxygen atoms are in a formula unit of calcium carbonate?

Hydrogen bonds are too weak to bind atoms together to form molecules, but they do hold different parts of a single large molecule in a specific three-dimensional shape.

A student explained to the class that helium has 8 valence electrons because it is in group 18. Is the student correct? - The student is incorrect because helium has 2 valence electrons and it's in group 18 because the first energy level is full.

When snow melts does its volume decrease or increase?

Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One group with calculators, the other group without calculators.

What might have caused this canyon to form

Define oxidation and reduction in terms of electron transfer

1. Which metal is the most reactive? How do you know this?

In addition to burning fossil fuels, humans return co2 to the atmosphere faster than it can be removed by:

A dilute solution contains large amounts of solute. True False

Consider the compound Sn (SO4) 2 and answer the following questions: a. What is the name of this compound? b. What is the molar mass of this compound? Explain how you calculated this value.