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NEU GenChem 9/28-10/1 Toher
These cards contain most of lecture material covered in Northeastern University GenChem I from 9/28/09-10/01/09 with Prof Toher
14
Chemistry
Undergraduate 1
10/04/2009

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Cards

Term
What is the prefix for 7?
Definition

Hepta.

Term
What is the prefix for 9?
Definition

Non-

Term
What suffix is always used in covalent nomenclature?
Definition

The prefix of -ide is always used in covalent nomenclature.

Term
What is Avogadro's Number and what is significant about it?
Definition

Avogadro's Number is 6.022 x 1023. This number is special because it is the number of atoms or molecules in a mole of an element or compound (respectively).

Term
What is the exact definition of a mole?
Definition

A mole is the amount of that contains exactly the number of atoms contained 12g of Carbon-12.

Term
What is the technical definition of "atomic mass"?
Definition

Atomic mass  equals the mass of 1 mole of an element or compound. Specific decimal places are due to the presense of mutliple isotopes within atoms.

Term
What is the first step in balancing chemical equations?
Definition

Write the reaction with blank spaces before ther formulas.

Term
What is the second step of balancing equations?
Definition

Check if the equation if already balanced.

Term
What is the third step of balancing equations?
Definition

Create a graph. Left = reactants, right = products.

Term
What is the fourth step of balancing chemical reactions?
Definition
Inspect for discrepencies in the graph.
Term
What trick should be used when balancing chemical equations?
Definition
Start with the element in lowest abundance (typcially a metal) and leave hydrogen for second to last and always balance oxygen last.
Term
Define molecular formula
Definition

A molecular formula is something that displays the actual mole-to-mole ratio between elements in a single structural unit.

Term
Define empirichal formula (aka simplest formula)
Definition

The empirichal formula displays the smallest whole-number ratio between elements in a formula (compound). Divide through by the greatest common factor.

Term
How do you determine the molecular and/or empirichal formula from mass % data?
Definition
1. Assume there is 100g (unless some other mass is given). 2. Replace % with grams. 3. Convert grams to moles. 4. Divide each mole value by the smallest from step 3. 5. Insert mole as a subscript. 6. If molecular formula is desired divide the mass of the empirichal formula into the given molar mass. 7. Multiply quotient of step 6 by the subscripts in the empirichal formula.
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