Concept explainers
Listed are several pairs of substances. For some pairs, one or both members of the pair react individually with water to produce a gas. For others, neither member of the pair reacts with water. The pair for which each member reacts with water and yields the same gaseous product is
(a) Al(s) and Ba(s); (b) Ca(s) and
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Chapter 21 Solutions
EBK GENERAL CHEMISTRY
- The equation for the fermentation of glucose to alcohol and carbon dioxide is: C6H12O6(aq) 2C2H5OH(aq) + 2CO2(g) The enthalpy change for the reaction is 67 kJ. Is this reaction exothermic or endothermic? Is energy, in the form of heat, absorbed or evolved as the reaction occurs?arrow_forwardThe enthalpy change for the reaction of hydrogen gas with fluorine gas (o produce hydrogen fluoride is 542 U for the equation as written: mg src=Images/HTML_99425-10-41QAP_image001.jpg alt="" align="top"/> l type='a'> What is the enthalpy change per mole of hydrogen fluoride produced? Is the reaction exothermic or endothermic as written? What would be the enthalpy change for the reverse of the given equation (that 1%, for the decomposition of HF into its constituent elements)?arrow_forwardSodium hydrogen sulfate is used as a cleaning agent and as a flux (a substance that promotes the fusing of metals and prevents the formation of oxides). One of the ways in which sodium hydrogen sulfate is manufactured is by reacting sodium dichromate, Na2Cr2O7, with sulfuric acid. This process also forms water and chromium(VI) oxide, CrO3. Write a balanced equation for this reaction. (You do not need to include states.) How many kilograms of sodium dichromate, Na2Cr2O7, are necessary to produce 130.4 kg of sodium hydrogen sulfate? How many kilograms of chromium(VI) oxide are formed when 130.4 kg of sodium hydrogen sulfate is made? What is the minimum volume of 18.0 M H2SO4 solution necessary to react with 874.0 kg of sodium dichromate? What is the maximum mass of sodium hydrogen sulfate, NaHSO4, that can be formed from the reaction of 874.0 kg of sodium dichromate with 400.0 L of 18.0 M H2SO4?arrow_forward
- Automobile exhaust often contains traces of ethene (C2 H4), which is another possible product of incomplete combustion. Write a balanced equation for the formation of ethene during the combustion of decane. (Water will also be formed as a product.) (Use the lowest possible coefficients. Omit states of matter.) + +arrow_forwardThe fluoride rinse in dental offices usually contains sodium fluoride. Sodium fluoride can be prepared from the reaction between sodium metal and fluorine gas. Which properly represents the balanced chemical equation for this reaction? Please explain the steps. Na(s) + F2(g) → NaF2(s) Na(s) + F(g) → NaF(s) 7Na(s) + F(g) → Na7F(s) 2Na(s) + F2(g) → 2Na2F(s) 2Na(s) + F2(g) → 2NaF(s) Why is it important to understand this equation? What do you think could happen if this is incorrect?arrow_forwardThere are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. In the first step, calcium carbide and water react to form acetylene and calcium hydroxide: CaC,(s)+2H,O(9)→C,H,(9)+Ca(OH);(s) In the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6C,H,(9)+3 CO,(9)+4H;O(9)→5CH,CHCO,H(9) Write the net chemical equation for the production of acrylic acid from calcium carbide, water and carbon dioxide. Be sure your equation is balanced. O-0 Torme of Le Check 02021 McGraw Hill LLC A ights Reser Explanation Addressarrow_forward
- Malachite is a green copper mineral with the formula Cu2CO3(OH)2. It can ber converted into copper metal in a number of ways. One method extracts the metal by reacting the malachite with sulfuric acid to form CuSO4, and then adding iron to the CuSO4 solution which, after they react, forms FeSO4 and copper metal. The balanced chemical reactions are: Cu2CO3(OH)2(s) + 2H2SO4(aq) -> 2CuSO4(aq) + 3H2O(l) + CO2(g) CuSO4(aq) + Fe(s) -> FeSO4(aq) + Cu(s) If the final solution is dried, and 3.28 g of iron sulfate is collected, how many grams of malachite were originally used?arrow_forwardWrite the balanced chemical equations for (a) the complete combustion of acetic acid 1CH3COOH2, the main active ingredient in vinegar; (b) the decomposition of solid calcium hydroxide into solid calcium (II) oxide (lime) and water vapor; (c) the combination reaction between nickel metal and chlorine gas.arrow_forward2. An experiment to determine the carbon-sequestration capacity of a poui tree determined that in 1 year, the mature tree could remove 11,455 L (measured at room temperature and pressure) of carbon dioxide from the air, using the process in Q.1(d) to produce glucose. What mass of glucose would the poui tree have produced doing this?arrow_forward
- A hydrate of nickel(II) chloride (NiCl2·XH2O) decomposes to produce 29.5% water & 70.5% AC. Calculate the water of crystallization for this hydrated compound. (The molar mass of anhydrous NiCl2 is 129.6 g/mol.) In other words, what is the X in the formula: NiCl2·XH2O?arrow_forwardHematite, Fe₂O3, is an important ore of iron. (An ore is a natural substance from which the metal can be profitably obtained.) The free metal is obtained by reacting hematite with carbon monoxide, CO, in a blast furnace. Carbon monoxide is formed in the furnace by partial combustion of carbon. The reaction is Fe₂O3(s) + 3CO(g) → 2Fe(s) + 3CO₂(g) How many grams of iron can be produced from 1.34 kg Fe₂03? g Fearrow_forwardTo obtain pure lead, lead (II) sulfide is burned in an atmosphere of pure oxygen. The products of thereaction are lead and sulfur trioxide (SO3). Write a balanced chemical equation for this process.arrow_forward
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