Exam 1 Study Guide
Exam 1 Study Guide 70058 - CHEM 211 - 002
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70058 - CHEM 211 - 002
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This 5 page Study Guide was uploaded by Meredith Bean on Tuesday February 23, 2016. The Study Guide belongs to 70058 - CHEM 211 - 002 at George Mason University taught by Paul David Cooper (P) in Fall 2015. Since its upload, it has received 42 views. For similar materials see General Chemistry I in Chemistry at George Mason University.
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Date Created: 02/23/16
EXAM 1 Study Guide Exam Dates: (2/242/27) in Planetary Testing Center States of matter Sample Problem: Think: Solutions are homogeneous mixtures of two or more substances. Since (I) and (III) only represent one type of molecular particle, they cannot be a solution. There may be two different types of particles in (II), however they are not homogeneously mixed and appear to be in separate layers. Therefore, (IV) is the best example of a solution. Temperature: Be able to convert between Celsius, Kelvin, and Fahrenheit!! Density = Mass/Volume Know significant figure rounding (Chapter 1), be able to put into scientific notation Significant Zeroes Multiplication and Division: Go by fewest number of sig figs from values given in problem Addition and Subtraction: Go by fewest number of digits from values given in problem Unit conversions – Know your prefixes! Molarity: Molar mass, mass ratio Sample Problem: A solution is made by dissolving 60 g of NaOH (M= 40 g/mol) in enough distilled water to make a 300 mL of a stock solution. What volumes of this solution and distilled water, when mixed, will result in a solution that is approx. 1 M NaOH? Calculating Molecular mass – Be friends with your Periodic Table! Isotopes, be able to calculate proton/neutron/electron counts Sample 54oblem 1: Whi54 pair represents isotopes? a) 24Cr and 26e 235 238 b) 92 and 92 148d 150n c) and 239 239 d) 93p and 94Pu Think: Isotopes are forms of the same element that differ only in the number of neutrons in the nuclei. Bottom subscript represents number of protons, determines identity of the element. 56X Sample Problem 2: Which element is represented by 24 ? a) Iron b) Germanium c) Barium d) Chromium Go to Periodic table and find element with atomic number of 24, also corresponding to number of protons. Atomic mass being 54 on the Periodic table should not deter you – this means its an isotope. Balancing molecules and equations Every molecule (i.e. H2O) has to be balanced in charge. There are two H atoms for every O atom so the overall compound has a net charge of 0 Naming compounds (Chapter 2) ic, ous, ate, ite Limiting Reactants (Chapter 3) Helpful resources: Practice exam on Blackboard, Previously posted Chapter notes (13), Homework assignments, Learnsmart
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