1 Chemistry: An Introduction 2 Measurements And Calculations 3 Matter 4 Chemical Foundations: Elements, Atoms, And Ions 5 Nomenclature 6 Chemical Reactions: An Introduction 7 Reactions In Aqueous Solutions 8 Chemical Composition 9 Chemical Quantities 10 Energy 11 Modern Atomic Theory 12 Chemical Bonding 13 Gases 14 Liquids And Solids 15 Solutions 16 Acids And Bases 17 Equilibrium 18 Oxidation–reduction Reactions And Electrochemistry 19 Radioactivity And Nuclear Energy 20 Organic Chemistry 21 Biochemistry Chapter6: Chemical Reactions: An Introduction
6.1 Evidence For A Chemical Reaction 6.2 Chemical Equations 6.3 Balancing Chemical Equations Chapter Questions Section: Chapter Questions
Problem 1ALQ: The following are actual student responses to the question: Why is it necessary to balance chemical... Problem 2ALQ Problem 3ALQ: Given the equation for the reaction:N2+H2NH3 , draw a molecular diagram that represents the reaction... Problem 4ALQ Problem 5ALQ: Can the subscripts in a chemical formula be fractions? Explain. Problem 6ALQ Problem 7ALQ: Changing the subscripts of chemicals can mathematically balance the equations. Why is this... Problem 8ALQ: Table 6.1 lists some clues that a chemical reaction has occurred. However, these events do not... Problem 9ALQ: Use molecular-level drawings to show the difference between physical and chemical changes. Problem 10ALQ: It is stated in Section 6.3 of the text that to balance equations by inspection you start “with the... Problem 11ALQ Problem 12ALQ: Consider the generic chemical equationaA+bBcC+dD (where a, b, c, and d represent coefficients for... Problem 13ALQ Problem 14ALQ: Which of the following correctly describes the balanced chemical equation given below? There may be... Problem 15ALQ: Which of the following correctly balances the chemical equation given below? There may be more than... Problem 16ALQ: The reaction of an element X() with element Y() is represented in the following diagram. Which of... Problem 1QAP Problem 2QAP Problem 3QAP: Although these days many people have “self-cleaning” ovens, if your oven getsreallydirty you may... Problem 4QAP Problem 5QAP: You have probably had the unpleasant experience of discovering that a flashlight battery has gotten... Problem 6QAP: If you’ve ever left bread in a toaster too long, you know that the bread eventually burns and turns... Problem 7QAP: What are the substances to theleftof the arrow in a chemical equation called? To therightof the... Problem 8QAP Problem 9QAP: In a chemical reaction, the total number of atoms present after the reaction is complete is (larger... Problem 10QAP Problem 11QAP Problem 12QAP: The notation “(l)” after a substance’s formula indicates it exists in the __________ state. Problem 13QAP: A common experiment to determine the relative reactivity of metallic elements is to place a pure... Problem 14QAP: A common lecture demonstration called “elephant’s tooth paste” demonstrates the reaction of hydrogen... Problem 15QAP: If a sample of pure hydrogen gas is ignited very carefully, the hydrogen burns gently, combining... Problem 16QAP: Liquid hydrazine, has been used as a fuel for rockets. When the rocket is to be launched, a catalyst... Problem 17QAP: If electricity of sufficient voltage is passed into a solution of potassium iodide in water, a... Problem 18QAP: Silver oxide may be decomposed by strong heating into silver metal and oxygen gas. Write the... Problem 19QAP: Elemental boron is produced in one industrial process by heating diboron trioxide with magnesium... Problem 20QAP: Many over-the-counter antacid tablets are now formulated using calcium carbonate as the active... Problem 21QAP: Phosphorus trichloride is used in the manufacture of certain pesticides and may be synthesized by... Problem 22QAP: Pure silicon, which is needed in the manufacturing of electronic components, may be prepared by... Problem 23QAP: Nitrous oxide gas (systematic name: dinitrogen monoxide) is used by some dental practitioners as an... Problem 24QAP: Solid zinc is added to an aqueous solution containing dissolved hydrogen chloride to produce gaseous... Problem 25QAP: Acetylene gas (C2H2) is often used by plumbers, welders, and glass blowers because it burns in... Problem 26QAP: The burning of high-sulfur fuels has been shown to cause the phenomenon of “acid rain.” When a... Problem 27QAP: The Group 2 metals (Ba, Ca, Sr) can be produced in the elemental state by the reaction of their... Problem 28QAP: There are fears that the protective ozone layer around the earth is being depleted. Ozone, is... Problem 29QAP: Carbon tetrachloride was widely used for many years as a solvent until its harmful properties became... Problem 30QAP: When elemental phosphorus, P4, burns in oxygen gas, it produces an intensely bright light, a great... Problem 31QAP: Calcium oxide is sometimes very challenging to store in the chemistry laboratory. This compound... Problem 32QAP Problem 33QAP: The element tin often occurs in nature as the oxide, SnO2 . To produce pure tin metal from this sort... Problem 34QAP: Nitric acid, HNO3 , can be produced by reacting high-pressure ammonia gas with oxygen gas at around... Problem 35QAP: When balancing chemical equations, beginning students are often tempted to change the numbers within... Problem 36QAP: The “Chemistry in Focus” segment The Beetle That Shoots Straight discusses the bombardier beetle and... Problem 37QAP: Balance each of the following chemical equations. l type='a'>... Problem 38QAP: Balance the equations for the reaction of potassium with water. :math>K(s)+H2(l)H2(g)+KOH(aq) mg... Problem 39QAP: Balance each of the following chemical equations. msp;K2SO4(aq)+BaCl2(aq)BaSO4(s)+KCl(aq)... Problem 40QAP: Balance each of the following chemical equations. msp;Na2SO4(aq)+CaCl2(aq)CaSO4(s)+NaCl(aq)... Problem 41QAP: Balance each of the following chemical equations. l type='a'> msp;Fe3O4(s)+H2(g)Fe(l)+H2O(g)... Problem 42QAP Problem 43QAP Problem 44QAP Problem 45AP: Acetylene gas, C2H2 , is used in welding because it generates an extremely hot flame when it is... Problem 46AP: When balancing a chemical equation, which of the following statements is false? l type='a'>... Problem 47AP: Crude gunpowders often contain a mixture of potassium nitrate and charcoal (carbon). When such a... Problem 48AP: The following demonstration takes place in a two-step process: First, solid calcium carbide (CaC2)... Problem 49AP: Methanol (methyl alcohol), CH3OH , is a very important industrial chemical. Formerly, methanol was... Problem 50AP: The Hall process is an important method by which pure aluminum is prepared from its oxide (alumina,... Problem 51AP: Iron oxide ores, commonly a mixture of FeO and Fe2O3 , are given the general formula Fe2O3 . They... Problem 52AP: True or false? Coefficients can be fractions when balancing a chemical equation. Whether true or... Problem 53AP: When steel wool (iron) is heated in pure oxygen gas, the steel wool bursts into flame and a fine... Problem 54AP: One method of producing hydrogen peroxide is to add barium peroxide to water. A precipitate of... Problem 55AP: When elemental boron, B, is burned in oxygen gas, the product is diboron trioxide. If the diboron... Problem 56AP: A common experiment in introductory chemistry courses involves heating a weighed mixture of... Problem 57AP: A common demonstration in chemistry courses involves adding a tiny speck of manganese(IV) oxide to a... Problem 58AP: Write a balanced chemical equation for the complete combustion of pentene, C7H14 . In combustion,... Problem 59AP Problem 60AP Problem 61AP: If you had a “sour stomach,” you might try an over-the-counter antacid tablet to relieve the... Problem 62AP: When iron wire is heated in the presence of sulfur, the iron sulfur begins to glow, and a chunky,... Problem 63AP: When finely divided solid sodium is dropped into a flask containing chlorine gas, an explosion... Problem 64AP: If aqueous solutions of potassium chromate and barium chloride are mixed, a bright yellow solid... Problem 65AP: When hydrogen sulfide, H2S , gas is bubbled through a solution of lead(II) nitrate, Pb( NO3)2 , a... Problem 66AP: If an electric current is passed through aqueous solutions of sodium chloride, sodium bromide, and... Problem 67AP: When a strip of magnesium metal is heated in oxygen, it bursts into an intensely white flame and... Problem 68AP Problem 69AP: When solid red phosphorus, is burned in air, the phosphorus combines with oxygen, producing a... Problem 70AP: When copper (II) oxide is boiled in an aqueous solution of sulfuric acid, a strikingly blue solution... Problem 71AP: When lead(II) sulfide is heated lo high temperatures in a stream of pure oxygen gas, solid lead(II)... Problem 72AP: Which of the following statements about chemical reactions is false? l type='a'> When balancing a... Problem 73AP Problem 74AP Problem 75AP Problem 76AP: Using different shapes to distinguish between different elements, draw a balanced equation for the... Problem 77CP: Which of the following statements about chemical equations is (are) /true? l type='a'> When... Problem 78CP Problem 79CP: Balance the following chemical equations. msp;MnO2(s)+CO(g)Mn2O3(aq)+CO2(g)Al(s)+H2SO4(aq)Al2( SO... Problem 2ALQ
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2. Classify each of the following as either aromatic (A) or nonaromatic (NA)
Transcribed Image Text: 2)
3. H₂O, heat
HO
Definition Definition Organic compounds with a planar cyclic ring of atoms bonded through alternated single and double bonds. Aromatic organic compounds, also called arenes, are an important class of hydrocarbons under the branch of organic chemistry.
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