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COMPOUNDS AND BONDING. What is a COMPOUND?. A compound is a substance that is composed of atoms of two or more different elements that are chemically combined. EX: Water is a combination of oxygen and hydrogen.
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What is a COMPOUND? • A compound is a substance that is composed of atoms of two or more different elements that are chemically combined. • EX: Water is a combination of oxygen and hydrogen. • The properties of the compound are different than the properties of the two different elements.
How do the elements (atoms) combine? • Atoms can combine using one of two methods: • Covalent Bonding • Ionic Bonding • This only happens when conditions are just right!
COVALENT BONDINGSHARING and CARING • Remember what you know about protons and electrons! • When two atoms SHARE electrons, the force that holds them together is called a COVALENT BOND. • Most compounds in organisms have covalent bonds. (Ex: sugars, fats, etc)
What is a MOLECULE? • A MOLECULE is a group of atoms held together by covalent bonds. • EX: Water molecule H20 2 atoms of hydrogen +1 atom of oxygen 1 molecule of water!
Some atoms always form the same number of bonds with other atoms.
Organic vs. Inorganic • An organic compound is any compound that has a carbon-hydrogen bond in it!
IONIC BONDINGOPPOSITES DO ATTRACT! • Remember what you know about protons and electrons! • An ION is a charged particle. • IONIC bonding then deals with charges! • IONIC BONDS are formed when atoms of opposite charge are attracted to each other. (+ - )