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AP Chem Unit 1

AP Chemistry

TermDefinition
Why do chemist use moles? Moles are used to connect the mass of substances reacting and the number of particles undergoing chemical changes
6.02x10^23 Is the number of things in a mole
Formula Mass 1. Count atoms in chemical formula 2. Find atomic mass of each element on the periodic table 3. Multiply atoms by atomic mass to find mass per element 4. Sum results to find the total formula mass
Molar mass The mass of each sample is equal to the formula mass of the substance's particles in units of grams. This is the mass of one mole or the molar mass.
How do chemist use molar mass? Molar mass is used to convert quantities between mass units (grams) and count units (moles)
1 mole molar mass, g
Conversion Factors A conversion factor is a ratio (or fraction) which represents the relationship between the same quantity in two different units. There are two conversation factors for every equality.
A sucrose packet contains 4.0g sucrose C_12 H_22 O_11. How many moles of sucrose does the packet contain? 1. Find the molar mass of sucrose: 342.3 g/mol 2. Wrote a mole-mass conversion factor with grams in the denominator. 3. Multiply given quantity by the conversion factor. 4.0g x (1 mol/ 324.3g)= 0.012 mol
Mass spectra Is a technique used to identify the isotopes of an element and their relative abundance in nature.
What is the likely identity of an element? Look on the periodic table for the element closest in atomic mass to the calculated value
How to calculate or the approximate average atomic mass? 1. Identify isotope's masses and percent abundance from the graph. 2. Multiply each isotope's mass by its relative abundance (not percent abundance) 3. Add results
Created by: Leo12345
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