Chemistry Notes

Learn chemistry. Here you will find a collection of chemistry notes, projects, worksheets, and labs.

A hydrogen bond forms between hydrogen and a more electronegative atom or group of another molecule. — Get the hydrogen bond definition. See types and examples of hydrogen bonds.

Hydrogen Bond Definition and Examples Recently updated !

This entry was posted on September 23, 2020 by Anne Helmenstine (updated on September 23, 2020)

Element Charges Chart — Get a handy element charges chart and periodic table. Learn how to know the charge of an atom.

Element Charges Chart – How to Know the Charge of ... Recently updated !

This entry was posted on September 17, 2020 by Anne Helmenstine (updated on September 17, 2020)

Ionization energy is the energy required to remove an electron from an atom. — Get the definition of ionization energy and learn about its periodic table trend.

What Is Ionization Energy? Definition and Trend

This entry was posted on September 16, 2020 by Anne Helmenstine (updated on September 16, 2020)

Element Blocks — Learn what the main group elements are, which elements are included, and why these elements are important.

Main Group Elements – Definition and Importance Recently updated !

This entry was posted on September 14, 2020 by Anne Helmenstine (updated on September 22, 2020)

Dissolving salt in water may be considered a chemical change or a physical change. — Learn whether dissolving salt in water is a chemical change or a physical change. Explore arguments for both answers.

Is Dissolving Salt in Water a Chemical Change or a ...

This entry was posted on September 13, 2020 by Anne Helmenstine (updated on September 13, 2020)

What Is a Molecule? Definition and Examples — Get the definition of a molecule. See examples of molecules and learn the different between a molecule and a compound.

What Is a Molecule? Definition and Examples

This entry was posted on September 12, 2020 by Anne Helmenstine (updated on September 12, 2020)