CHEM 1A Review MR. BANNISTER. PART I: The Periodic Table.
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Transcript of CHEM 1A Review MR. BANNISTER. PART I: The Periodic Table.
![Page 1: CHEM 1A Review MR. BANNISTER. PART I: The Periodic Table.](https://reader036.fdocuments.in/reader036/viewer/2022081516/56649e5d5503460f94b557e9/html5/thumbnails/1.jpg)
CHEM 1A Review MR. BANNISTER
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PART I: The Periodic Table
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Atomic Number and Atomic Mass
The mass number is the atomic number
rounded to the closest whole number.
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Metals vs. Nonmetals
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Part II: Formula Writing
Ionic Compounds vs. Covalent Compounds (aka. Molecular Compounds)
Form between metals and nonmetals
OR
Form between metals and polyatomic ions
Form between two or more nonmetals
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Ionic Compounds
• CHARGES!
Ex. Lithium nitride
Ex. Magnesium oxide
Ex. Potassium Sulfate
Li+1 N-3
K+1 (SO4)-2
Mg+2 O-2
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Covalent Compounds (aka. Molecular Compounds)
• Do not worry about charges!
• Greek prefixes only!
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Part III: Balancing Equations
• Rules for Balancing:– 1. Only change/add co-
efficient; never subscripts!
– 2. If a polyatomic ion appears on both sides, do not break it apart: balance it as a unit!
– 3. Balance hydrogen and oxygen last!
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Part IV: Stoichiometry
• Molar Mass
– Take inventory of all atoms in your compounds – Look up the molar mass of each element – Multiple the number of each by the molar mass– Add em’ up!
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Gram to Mole
• 1 mole of any substance = molar mass of that substance
• Use dimensional analysis and be sure your units cancel!