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Bases

CHEM 1A midterm 2

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Chemistry 1A, Fall 2011 Midterm Exam #2 October 18, 2011 (90 min, closed book) Name:__________________________________ SID:___________________________________ GSI Name:________________ ? The test consists of 4 short answer questions and 23 multiple choice questions. ? Put your written answers in the boxes provided. Answers outside the boxes will NOT be considered in grading. ? Write your name on every page of the exam. Question Page Points Score Multiple Choice 2-8 76 Cabbage juice 2 6 Kitty Litter 3 6 Nicotine 5 4 Caffeine 7 8 Total 100

CHEM 1A midterm 1 key

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Chemistry 1A, Fall 2011 Midterm Exam #2 October 18, 2011 (90 min, closed book) Name:__________________________________ SID:___________________________________ GSI Name:________________ ? The test consists of 4 short answer questions and 23 multiple choice questions. ? Put your written answers in the boxes provided. Answers outside the boxes will NOT be considered in grading. ? Write your name on every page of the exam. Question Page Points Score Multiple Choice 2-8 76 Cabbage juice 2 6 Kitty Litter 3 6 Nicotine 6 4 Caffeine 8 8 Total 100 Useful Equations and Constants: pH = - log[H+] pX = - log X X = 10-pX Kw = 1?10-14 at 25?C PV = nRT ][ ][ log HA A pKpH a ?

Chapter 3/4

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Chemistry
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Chemical reactions
Titration
solubility
Strong electrolyte
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Mole
Limiting reagent

Claire Rafson Chapter 3 notes 3.1 You can count things by weight 3.2 Atomic mass determined on a mass spectrometer Average atomic mass = atomic mass for the element 3.3 Avogadro?s number = 6.02214 X 10^23 1 mole = avogadro?s number 3.4 molar mass= mass in grams of one mole of the compound 3.5 Percent comp of compounds Mass percent- weight percent can be computed by comparing the mass of carbon Find moles of all divide by smallest number find whole number etc. 3.6 Molecular formula= (empirical formula)n N is an integer To find molec formula take molar mass/ empirical formula mass and that is n SEE PAGE 96 IF CONFUSED 3.7- Chemical Reactions- Reactants on left and products on the right. Aq- dissolved in water 3.8- Balance reactions 3.9- Stoichiometry-

Acids and Bases

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Unit 7: Acid and Bases Acid Base Lemonade Dressing Vinegar Drain-0 Arm-n-Hammer Arrhenius Acids: When in a solution, they donate protons (H+) A proton in water becomes a ?hydronium? ion H3) SameEx) HCL (aq) H+(aq) + Cl-(aq) HCl(l) + H2) H30+(aq) + Cl- Acids cause indicators to change color (Table M) Ex) Bromthymol blue, litmus, phenolphthalein Sour Taste (ex. Citric acid) pH<7 (0-7) (pure acid 100%) Measure of H+ concentration p= power (pH. If [H+} = 1 X 10-7 All acids dissolve metal to produce H2 gas (corrosive) chemically dissolve A neutralization reaction occurs b/t an acid and a base to form a salt and water Arrhenius Base: When in a solution, they donate hydroxide ions (OH-) to the solution

hi

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Chlorine

Chemistry Final Review Guide 2012 The 1st Section on the final will be metric conversions, significant figures, and scientific notation. The 2nd Section on the final will be multiple choice questions. There will be 40 of them and they will cover vocabulary and basic chemistry questions. The BEST way to study for this section would be to gather all old chemistry tests and review all of the multiple choice questions The 3rd Section will be calculations split into 3 parts. Part A will focus on writing chemical equations from word equations, balancing them, and then stating what type of reaction it is. For example: 1. Solid aluminum reacts with oxygen gas to produce aluminum oxide.

Chapter 16 Powerpoint

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Acids
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Acid
Brønsted–Lowry acid–base theory
Carboxylic acid
Lewis acids and bases
education

Acid-Base Equilibria Priyal Patel 0 period 16.1 Acids and Bases: A Brief Review Acids have a sour taste and cause certain dyes to change color Sour taste Linked to H+ ions Bases are bitter and feel slippery Bitter taste Feel slippery Linked to OH- ions When acids and bases are mixed in certain proportions, their characteristics disappear altogether 16.2 Bronsted-Lowry Acids and Bases Danish Chemist Johannes Bronsted and English chemist Thomas Lowry proposed a definition of acids and bases Based on the fact that acid-base reactions involve the transfer of H+ ions from one substance to another. The H+ Ion in Water An H+ is a proton with no surrounding valence electrons This proton bonds interacts with nonbonding electrons of water molecules to form hydrated hydrogen ions.

Campbell Biology Chapter 3 outline

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Biology
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Chemistry
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Acids
Oxides
Properties of water
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water
PH
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Solution
#AP Bio #CampbellBiology #Chapter 3 #Outline

CHAPTER 3 ? WATER AND LIFE THE MOLECUES THAT SUPPORT ALL OF LIFE Water is the only natural substance to exist in all 3 states of matter: Solid Liquid Gas WATER molecule is a polar molecule It has a positive and a negative end It can make up to 4 Hydrogen bonds that break and reform instantaneously. 4 Emergent properties of water COHESION The linking together of like molecules, often by hydrogen bonds. Water sticks to itself Adhesion- water sticks to something else Surface Tension ? A measure of how difficult it is to stretch or break the surface of a liquid. Water has a high surface tension because of the hydrogen bonding of surface molecules MODERATION OF TEMPERATURE BY WATER HEAT AND TEMPERATURE Kinetic Energy ?

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