compounds. substance formed by the chemical combination of two or more elements in definite...
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Compounds
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Compounds
• Substance formed by the chemical combination of two or more elements in definite proportions
• Example: WATER!
• Water is NOT an element! Made up of 2 elements!!
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CaCO3
• Calcium carbonate– How many atoms of calcium?– How many atoms of carbon?– How many atoms of oxygen?
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LET’S CHECK YOUR BELLRINGER
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ALMOST ALL ELEMENTS EXIST IN A COMPOUND FORM.
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MOLECULE
• Structure that results when atoms join together.
• Smallest unit of most compounds.
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Why do compounds form?
• Stability
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VALENCE ELECTRONS = ELECTRONS IN THE OUTERMOST RING
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PERIODIC TABLE IS ORGANIZED ACCORDING TO REACTIVITY…OR THE # OF VALENCE ELECTRONS
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IN ORDER TO BE STABLE, THE OUTERMOST ELECTRON RING MUST BE COMPLETELY FILLED.
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ATOMS IN COMPOUNDS ARE HELD TOGETHER BY BONDS.
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LET’S MAKE ONE OF THE MOST PREVALENT COMPOUNDS IN YOUR BODY!
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Bond Types
• There are two types of bonds:– Ionic– Covalent
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Remember…
• Why do atoms bond in the first place?• What is the key subatomic particle involved in
bonding?
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What is going on in each picture? Which picture would best match IONIC BONDS? Which
picture would best match COVALENT BONDS?
A B
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Ionic Bonds
• Formed when one or more electrons are transferred from one atom to another. (ions)
• The resulting oppositely charged ions are attracted to each other – forming the bond
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Covalent Bonds
• Forms when electrons are shared between atoms.
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Covalent Bonds
• Most commonly found bond in compounds that make up living things.