Lect+6+Fall+2011 - Review Whichstatementbest...

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9/1/2011 1 Chapter 1: The Air we Breathe ( i d) (continued) Sept. 2/2011 Review: Which statement best describes a molecule? 1. It’s the same as a compound. 2. It’s the same as an element. 2 3. It can be an element or a compound. 4. It’s the simplest form of matter. Review: Which is correct for SF 6 : sulfur ____fluoride. 1. Mono 2. Tetra 3 3. Hexa 4. Hepta 5. Nona Review: Name the hydrocarbon shown. 1. Ethane 2. Propane 3 Decane 4 3. Decane 4. Butane 5. Pentane
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9/1/2011 2 Balancing Chemical Equations Identity & atoms are the same on both sides Number of molecules & states may change C + O 2 Æ CO – is this a balanced equation? Once the correct chemical formulas are written, we cannot change them Balance using whole number coefficients 5 Algebraic Balancing Equation: N 2 + O 2 Æ NO 2 total N 2 a O 2 b NO 2 N O From 1 st row of table: From 2 nd row of table: 6 Treat the arrow ( Æ ) from the equation as an equal sign Once you’ve solved for a and b ; put them back into your equation. Balancing Chemical Equations Combustion of the simplest hydrocarbon, CH 4 , the primary component of natural gas
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