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Same electrons = same properties

What makes up matter?

Chemical Bonds

Covalent bond- when valence electrons are shared between atoms

Ionic bond- when one or more valence electrons are transferred from one atom to another

Van der Waals forces- slight attractions between oppositely charged regions of nearby molecules

Atoms

If an atom has equal numbers of protons (+) and electrons (-), what charge would it have?

Cation- Positive ion

Anion- Negative ion

Ions

  • Basic unit of matter
  • Subatomic particles
  • Proton
  • Neutron
  • Electron

With your shoulder partner, discuss everything you remember about atoms, protons, neutrons, and electrons.

Proton- positive, in nucleus, 1 amu

Neutron- no charge, in nucleus, 1 amu

Electron- negative, orbiting nucleus, 1/1840 amu

Why study chemistry in biology?

Chapter 2: Chemistry of Life

Properties of Water

Elements

What's the difference between cohesion and adhesion?

Polar Molecule

A molecule in which the charges are unevenly distributed

Name the 4 most common elements found in living organisms.

Hydrogen Bond

Isotopes

The attraction between the hydrogen atom on one water molecule and the oxygen atom on another

Compound

Atoms of the same element with different numbers of neutrons

Chemical substance formed by the chemical combination of 2 or more elements in definite proportions

Element- chemical substance that consists entirely of one type of atom

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