JOSH’S FANTASTERIFFIC CHEMISTRY REVIEW PACKET! VOCABULARY: You should recognize/know all of the following terms, be able to describe them, use them in a sentence, and understand their connection to other chemistry terms and chemistry as a whole. This is a list of every vocab word in the book (yes, you should know them all). Go through the list and HIGHLIGHT every word you do not recognize, cannot define, or do not know the meaning of in terms of chemistry. Then, using the space to the right, define the words. Chapter 2 Density Dimensional Analysis Accuracy Error Percent Error Significant Figure Chemical Property Extensive Property Intensive Property Gas Liquid Solid Physical Property States of Matter Vapor Chemical Change Law of conservation of mass Physical change Phase Change Heterogeneous Mixture Homogeneous Mixture Mixture Solution Compound Element Law of Definite Proportions Law of multiple proportions Percent mass Dalton’s Atomic theory Atom Electron Neutron Nucleus Proton Atomic Mass Isotope Alpha Particle Alpha Radiation Beta particle/radiation Gamma Ray Nuclear Equation Radioactive decay Amplitude Electromagnetic Radiation Frequency Photon Planck’s Constant Quantum Wavelength Atomic Orbital De Broglie equation Energy sublevel Ground State Heisenberg Uncertainty Principle Quantum Number Aufbau Principle Electron Configuration Electron-dot Structure Hund’s Rule Pauli Exclusion Principle Valence Electron Actinide Series Alkali metal Alkaline earth metal Group Halogen Inner Transition Metal Lanthanide Series Metal Metalloid Noble Gas Nonmetal Period Periodic Law Representative Element Transition Element Chapter 5 Chapter 3 Chapter 4 Chapter 6 Transition Metal Electronegativity Ion Ionization energy Octet Rule Anion Cation Chemical Bond Crystal Lattice Electrolyte Ionic Bond Ionic Compound Lattice Energy Formula Unit Monatomic Ion Oxidation Number Oxyanion Polyatomic Ion Alloy Delocalized Electron Electron Sea Model Metallic Bond Covalent Bond Endothermic Reaction Exothermic Reaction Lewis Structure Molecule Pi Bond Sigma Bond Resonance Structural formula Polar Covalent Bond Chemical Equation Chemical Reaction Coefficient Product Reactant Combustion Reaction Decomposition Reaction Double-Replacement Reaction Precipitate Single-Replacement Reaction Synthesis Reaction Aqueous Solution Complete Ionic Equation Net Ionic equation Chapter 10 Chapter 7 Chapter 8 Chapter 9 Solute Solvent Spectator Ion Avogadro’s Number Mole Molar Mass Empirical Formula Molecular Formula Percent Composition Hydrate Mole Ratio Stoichiometry Excess Reactant Excess Reactant Limiting Reactant Actual yield Percent Yield Theoretical Yield Atmosphere Barometer Dalton’s Law of Partial Pressures Diffusion Elastic Collision Graham’s Law of effusion Kinetic-Molecular Theory Pascal Pressure Dipole-Dipole Force Hydrogen Bond Dispersion Force Amorphous Solid Crystalline Solid Surfactant Surface Tension Unit Cell Viscosity Boiling Point Condensation Deposition Evaporation Freezing Point Melting Point Phase Diagram Triple Point Vaporization Chapter 11 Chapter 12 Vapor Pressure Absolute Zero Boyle’s Law Charles’s Law Combined Gas Law Gay-Lussac’s Law Avogadro’s Principle Ideal gas Constant Ideal Gas Law Molar Volume Chapter 13 Chapter 14 Solvation Supersaturated Solution Unsaturated Solution Boiling Point Elevation Colligative Property Freezing Point depression Osmosis Osmotic Pressure Vapor Pressure Lowering Calorie Chemical Potential Energy Energy Heat Joule Law of Conservation of Energy Calorimeter Enthalpy Enthalpy of reaction Surroundings System Universe Thermochemistry Enthalpy of Combustion Molar Enthalpy of Fusion Molar Enthalpy of Vaporization Thermochemical Equation Hess’s Law Chapter 15 Brownian Motion Colloid Immisible Insoluble Miscible Soluble Suspension Tyndall Effect Concentration Molality Molarity Mole Fraction Heat of Solution Henry’s Law Saturated Solution **Vocabulary from the final chapters is not included..mostly because I don’t know what chapters we’re going to do! HOPEFULLY you won’t have to review the ending chapters very much since they are so close to the final exam, but the vocabulary is listed at the end of the chapters if you need to. Chemistry Joke: Why do chemists like nitrates so much? They are cheaper than day rates. LOL!!! CHAPTER CONCEPT SUMMARIES Below are chapter summaries, which include the main ideas and concepts included in each chapter. Scan them over and make sure you understand the material, but keep in mind this is the basic information. There is no substitute for the book! If you come across some material you do not understand, or do not remember, or even have the slightest doubt about, go back to the book and re-READ that section! (don’t just look up the information, read the entire section. It helps!) CHAPTER 2: Analyzing Data Density is mass / volume. [grams/milliliter] Be able to recognize general conversion factors (like hours in a minute or days in a year, or number of molecules in a mole…) Be able to use dimensional analysis to change units. o Note from Josh: It is important to recognize the units on different numbers. If you are working the problem and have no idea what to do, but can keep the units straight, you will usually be able to figure things out! Accuracy refers to how close a measured value is to an accepted value. Precision refers to how close a series of measurements are to one another. Percent Error = [(experimental value – accepted value)/accepted value] * 100 SIGNIFIGANT FIGURE RULES o Nonzero numbers are always significant o Zeros between nonzero numbers are always significant o All final zeros to the right of the decimal are significant o Placeholder Zeroes are not significant. To remove placeholder zeroes, rewrite the number in scientific notation. o Counting numbers are defined as constants and have an infinite number of significant figures. Chapter 3: Matter – Properties and Changes Solids have their own definite shape and volume. Liquids have a constant volume and take the shape of their container. Gases also have constant volume and take the shape of their container, but they will flow to fill the container as a whole. Physical Property : a characteristic that can be observed without changing the sample’s composition. (i.e. density, color, boiling/melting point) Extensive Properties depend on the amount of the substance present (mass for example). Intensive properties do not (like density). Chemical Property: the ability of a substance to combine with or change into one or more other substances. LAW OF CONSERVATION OF MASS: mass is neither created nor destroyed during a chemical reaction. Mixture o Homogeneous: constant composition throughout o Heterogeneous: different throughout Solution: another name for a homogeneous mixture. LAWOF DEFINITE PROPORTIONS: a compound is always composed of the same elements in the same proportion by mass, no matter how large or small the sample. Percent mass = (mass of element / mass of compound) * 100 LAW OF MULTIPLE PROPORTIONS: when different compounds are formed by a combination of the same elements, different masses of one element combine with the same relative mass of the other element in a ratio of small whole numbers. Chapter 4: The Structure of the Atom Dalton’s Atomic Theory: o Matter is composed of extremely small particles called atoms. o Atoms are indivisible and indestructible o Atoms of a given element are identical in size, mass, and chemical properties. o Atoms of a specific element are different from those of another element. o Different atoms combine in simple, whole-number ratios to form compounds. o In a chemical reaction, atoms are separated, combined or rearranged. Note from Josh: You should be able to recognize the general history behind different models of the atom. I advise to go back and scan this section, 106-115, and at least be able to recognize different models and experiments. I doubt any extreme historical knowledge will be necessary. :D Isotopes of elements exist: they have the same number of protons but different numbers of electrons. Check out table 4.5 on page 124! It has the radiation particles. (alpha, beta, and gamma radation) Chapter 5: Electrons in Atoms The Wave nature of light: o Wavelength (lambda, the upside down y shape) is the shortest distance between two equivalent points on a wave o Frequency (nu, which looks like a v) is the number of waves that pass a given point per second. o Amplitude is the length from the waves height from the origin to a crest or from the origin to a trough. o Electromagnetic wave relationship C = (wavelength)(frequency), where C is the speed of light, 3E8 A quantum is the minimum amount of energy that can be gained or lost by an atom. o Equantum = hv, where v is the frequency and h is plank’s constant, 6.626E-34 The lowest possible energy level an atom can have is called its ground state. Atoms can gain energy, measured in quanta, and begin to enter an exited state. Electron configuration!!! o The S orbitals should be paired with the first two families on the periodic table. (S=2) o The P orbitals should be paired with the last 6. (P=6) o The D orbitals should be paired with the transition metals. (d=10) o The F orbitals should be paired with the lanthanide and actinides. (at the bottom of the periodic table) (f = 14) o To write out the electron configuration for a particular element, start at the top left of the periodic table, with hydrogen, and then go through each element, noting its configuration mentally, until you get to the element you want. You can also reference a noble gas, by placing that noble gas in brackets and then moving on from there. Electron Configuration Rules: o Afbau Principle: each electron occupies the lowest energy orbital available. o Pauli Exclusion Principle: a maximum of two electrons can occupy a single atomic orbital, but only if they have opposite spins. o Hund’s Rule: single electrons with the same spin must occupy each equal-energy orbital before additional electrons with opposite spins can occupy the same orbitals. The electron dot structure includes the elemental symbol Chapter 6: The Periodic Table and Periodic Law: Recognize the general history of the periodic table regarding its discovery (*Mendeleev) but no extreme historical knowledge will be necessary. Periods = Rows; Groups = columns. o Group 1- Alkali Metals o Group 2- Alkaline Earth Metals o Transition Metals: middle of the periodic table o Group 17- Halogens o Group 18- Noble gases Periodic Trends: o Atomic Radius: Large on bottom left of periodic table, small on top right of periodic table. o Ionic Radius: note that this is the radius of an ION, not an atom! Generally these increase when going down a group, but look at the picture on page 190 for a better view. o Ionization energy: the energy required to remove an electron from a gaseous atom. Ionization energy is generally larger on the top right of the periodic table and smaller on the bottom left of the periodic table. o Electronegativity: the relative ability of its atoms to attract electrons in a chemical bond. Electronegativity is generally smaller on the bottom left of the periodic table and greater on the top right of the periodic table. **OCTET RULE: atoms tend to gain, lose, or share electrons in order to acquire a full set of eight valence electrons. Chapter 7: Ionic Compounds and Metals A positively charged ion is a cation. A negatively charged ion is an anion. Ionic Compounds consist of a metal and a nonmetal. Remember that in an ionic compound, a crystalline structure is formed between the ions, and a crystal lattice, a geometric arrangement of particles, is formed. Melting point, boiling point, and hardness depend on how strongly the ions are attracted to one another Lattice energy: the strength of the forces holding ions in place. Naming Ionic Compounds: o The metal comes first, followed by the nonmetal and the appropriate ending. This will be ide most of the time, unless a polyatomic ion is being used. Remember that sometimes transition metals will be used for the metal, and since they can have more than one charge, the charge needs to be specific. (example: FeO is Iron (II) Oxide, but Fe2O3 is Iron (III) Oxide. Electron Sea Model: all the metal atoms in a metallic solid contribute to their valence electrons to form a ‘sea’ of electrons. Because they are free to move, they are often referred to a delocalized electrons. Metals o Melting/boiling points: great variation o Malleability, ductility, durability. (can be hammered into sheets, drawn into wire, and they last a long time). o Thermal conductivity and electrical conductivity. o Hardness and strength o An alloy is a combination of elements that have metallic properties. (brass, stainless steel, and cast iron are various alloys). In substitutional alloys, some of the atoms in the original metallic solid are replaced by other metals of similar atomic size. In interstitial alloys, small holes of the metallic crystal are filled with smaller atoms. Chapter 8: Covalent Bonding: A covalent bond consists of a nonmetal and a nonmetal. Electrons are shared rather than transferred A sigma bond occurs when the pair of shared electrons is in an area centered between the two atoms. (in a lewis dot structure, a single line is a sigma bond) A pi bond forms when parallel orbitals overlap and share electrons. A double bond is one sigma bond and one pi bond; a triple bond is one sigma bond and 2 pi bonds. Note from Josh: When naming compounds, identify what kind of compound it is first, and then go from there. Use what you know! Resonance is a condition that occurs when more than one valid Lewis structure can be written for a molecule or ion. A polar covalent bond is formed when there is an unequal sharing of electrons. Chapter 9: Chemical Reactions: The process by which atoms of one or more substances are rearranged to form a different substance is called a chemical reaction. (Be sure to balance equations! Whenever you are doing a problem involving a chemical equation it is probably wise to make sure that the equation is balanced.) Types of Reactions o Synthesis: A + B AB o Combustion: oxygen combines with a substance and releases energy in the form of heat and light. Whenever an organic material combusts, the products are ALWAYS carbon dioxide and water. o Decomposition: AB A + B o Single Replacement: A + BX AX + B o Double Replacement: AX + BY AY + BX **know how to write out ionic equations. (complete equation, net equation. Etc.) Chapter 10: The Mole: If you don’t know what a mole is by now then you are in some trouble Percent composition = (mass of element) / (mass of compound) times 100 LOOK AT EXAMPLE 10.10 on page 343. You should know how to do a problem like that Chemistry Joke: Q: If H-two-O is the formula for water, what is the formula for ice? A: H-two-O-CUBED. LOL!!!! ;-) Chapter 11: Stoichiometry Stoichiometry is the study of quantitative relationships between the amounts of reactants used and the amounts of products formed. It is based on the law of conservation of mass. REMEMBER TO HAVE A BALANCED CHEMICAL EQUATION!!! The rest is basically dimensional analysis Limiting Reactants o The limiting reactant limits the reaction and the excess reactant consists of reactants left over after the reaction has stopped. o Check out the sample problems to see how these work. o Theoretical Yield is what should happen according to calculation, and actual yield is the actual number received in an experiment or lab, Chapter 12: States of Matter: Gases o Have general knowledge of the kinetic molecular theory (pg. 403) o Diffusion: the movement of one material through another. Effusion: a gas escapes through a tiny opening. o Grahams law of effusion/diffusion: RateA/RateB = square root (molar mass B / molar mass A) o Pressure is defined as force per unit area. Pascal Kilopascal Atmosphere mmHG Torr 1 atm = 760 mmHg = 101.3 kPa = 760 torr o Dalton’s law of Partial Pressures: the total pressure of a mixture of gases is equal to the sum of the pressures of all the gases in the mixture. FORCES OF ATTRACTION o Dispersion Forces: weak forces that result from the temporary shifts in the density of electrons in the electron clouds. Dispersion forces are sometimes called London forces. o Dipole-Dipole forces: attractions between oppositely charged regions of polar molecules. o Hydrogen Bond: a special type of dipole-dipole bond; attraction that occurs between molecules bonded to a small, highly electronegative atom with at least one electron pair. Hydrogen bonds are typically the strongest. Liquids o Take the shape of their container o Viscosity: a measure of the resistance of a liquid to flow. Typically, the stronger the intermolecular forces, the higher the viscosity. o Surface tension: the energy required to increase the surface area of a liquid by a given amount. A measure of the inward pull by particles in the interior. o Compounds that lower the surface tension of water all called surfaceactive agents, or surfactants. Solids o Have crystalline shapes. Recognize table 12.5 on page 423 Recognize and be able to detail phase diagrams! (page 429) Chapter 13: Gases Boyles Law: P1V1 = P2V2 Charles Law: V1/T1 = V2/T2 Gay-Lussacs’ law: P1/T1 = P2/T2 Ideal Gas Law: PV = nRT Note from Josh: The ideal Gas law can be used in most any case involving gases, but it is important to know the other laws in the event that you aren’t given enough information to use the ideal gas law. If you somehow forget one of the gas law equations, just think of the bumper car metaphor! The ideal gas constant is .0821 l*atm/mol*k The ideal gas equation can be rearranged to find molar mass and also to find density. (pg 458) Chapter 14: Mixtures and Solutions Suspension: a mixture containing particles that settle out if left undisturbed. Colloid: particles do not settle out and the particles are between 1nm and 1000 nm. (ex. Milk) The dispersed particles of liquid colloids make jerky, random movements, called Brownian Motion. Tyndall effect: the scattering of light, due to particles that exist in a solution such as a colloid. Solutions: o Soluble: a substance that is able to dissolve in a solvent is said to be soluble. If it cannot, then it is insoluble. o Miscible: liquids that are soluble in each other in any proportion. Two liquids that can be mixed together but separate shortly after are said to be immiscible. EXPRESSING CONCENTRATION: o Percent by mass: mass of solute over mass of solution times 100 o Percent by volume: volume of solute over volume of solution times 100 o Molarity: moles of solute over liters of solution o Molality: moles of solute over kilograms of solvent o Mole fraction: moles of solute over moles of solute + moles Solvation: the process of surrounding solute particles with solvent particles to form a solution. o Factors that affect salvation include agitation, surface area, and temperature. Heat of Solution: the overall energy change that occurs during the solution formation process. Solubility o Unsaturated Solution: one that contains less dissolved solute for a given temperature and pressure than a saturated solution. o Saturated Solution: contains the maximum amount of dissolved solute for a given amount of solvent at a specific temperature and pressure. o Supersaturated Solution: contains more dissolved solute than a saturated solution at the same temperature. Colligative Properties: physical properties of solutions that are affected by the number of particles but not by the identity of dissolved solute particles. (ex: vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure) Boiling Point elevation:: Change in temperature = Kbm Freezing Point Depression: Change in temperature = Kfm Chapter 15: Energy and Chemical Change: Energy: the ability to do work and to cause change. The Law of conservation of energy states that in any chemical reaction or physical process, energy can be converted to one form or another, but it is neither created nor destroyed. Chemical Potential Energy: energy that is stored in a substance because of its composition. **Know the conversion factors and units of energy listed on page 518 in table 15.1 Specific Heat: the amount of heat required to raise the temperature of one gram of the substance by one degree Celsius. The specific heat of liquid water is 4.184. Equation for heat: Q = mc(delta T) Universe = surroundings + system Enthalpy is the heat content of a system at a constant pressure. Hess’ Law states that if you can add two or more thermochemical equations to produce a final equation for a reaction, then the sum of the enthalpy changes for the individual reactions is the sum of the enthalpy changes of the individual reactions. (**just think about changing the equations around like a puzzle, trying to get to the main equation)