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: If calcium carbonate is heated strongly, carbon dioxide gas is driven off. leaving a residue of... 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 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 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... format_list_bulleted
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