Concept explainers
For the preceding question, which of the following equationsbest represents the reaction?
a.
b.
c.
d.
e.
Justify your choice. For those you did not choose, explainwhy they are incorrect.
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Chemical Principles
- Complete and balance each of the following molecular equations for strong acid/strong base reactions. Underline the formula of the salt produced in each reaction. msp;NNO3(aq)+KOH(aq) msp;H2SO4(aq)+Ba(OH)2(aq) msp;HClO4(aq)+NaOH(aq) msp;HCl(aq)+Ca(OH)2(aq)arrow_forwardOn Easter Sunday, April 3, 1983, nitric acid spilled from a tank car near downtown Denver, Colorado. The spill was neutralized with sodium carbonate: 2HNO3(aq)+Na2CO3(aq)2NaNO3(aq)+H2O(l)+CO2(g) a. Calculate H for this reaction. Approximately 2.0 104 gal nitric acid was spilled. Assume that the acid was an aqueous solution containing 70.0% HNO3 by mass with a density of 1.42 glcm3. What mass of sodium carbonate was required for complete neutralization of the spill, and what quantity of heat was evolved? (Hf for NaNO3(aq) = 467 kJ/mol) b. According to The Denver Post for April 4, 1983, authorities feared that dangerous air pollution might occur during the neutralization. Considering the magnitude of H, what was their major concern?arrow_forwardWhich of the following statements about chemical reactions is false? l type='a'> When balancing a chemical equation, all subscripts must be conserved. i>When one coefficient is doubled, the rest of the coefficients in (he balanced equation must also be doubled. i>The subscripts in a balanced equation tell us the number of atoms in a molecule. i>The phases in a chemical reaction tell us the nature of the reactants and products.arrow_forward
- One of relatively few reactions that takes place directly between two solids at room temperature is Ba(OH)2+8H2O(s)+NH4SCN(s)Ba(SCN)2(s)+H2O(l)+NH3(g) In this equation, the 8H2O in Ba(OH)2 8H2O indicates the presence of eight water molecules. This compound is called barium hydroxide octahydrate. a. Balance the equation. b. What mass of ammonium thiocyanate (NH4SCN) must be used if it is to react completely with 6.5 g barium hydroxide octahydrate?arrow_forwardMagnesium metal (a component of alloys used in aircraft and a reducing agent used in the production of uranium, titanium, and other active metals) is isolated from sea water by the following sequence of reactions: Mg2+(aq)+Ca(OH)2(aq)Mg(OH)2(s)+Ca2+(aq)Mg(OH)2(s)+2HCl(aq)MgCl2(s)+2H2O(l)MgCl2(l)electrolysisMg(s)+Cl2+Cl2(g) Sea water has a density of 1.026 g/cm3 and contains 1272 parts per million of magnesium a5 Mg2+(aq) by mass. What mass, in kilograms, of Ca(OH)2; is required to precipitate 99.9% of the magnesium in 1.00103 L of sea water?arrow_forwardWhat is a combustion reaction? Are combustion reactions a unique type of reaction, or are they a special case of a more general type of reaction? Write an equation that illustrates a combustion reaction.arrow_forward
- You want to prepare barium chloride, BaC12, using an exchange reaction of some type. To do so, you have the following reagents from which to select the reactants: BaSO4, BaBr2, BaCO3, Ba(OH)2, HCI, HgSO4, AgNO3, and HNO3. Write a complete, balanced equation for the reaction chosen. (Note: There are several possibilities.)arrow_forwardABS plastic is a tough, hard plastic used in applications requiring shock resistance. The polymer consists of three monomer units: acrylonitrile (C3H3N), butadiene (C4H6), and styrene (C8H8). a. A sample of ABS plastic contains 8.80% N by mass. It took 0.605 g of Br2 to react completely with a 1.20-g sample of ABS plastic. Bromine reacts 1: 1 (by moles) with the butadiene molecules in the polymer and nothing else. What is the percent by mass of acrylonitrile and butadiene in this polymer? b. What are the relative numbers of each of the monomer units in this polymer?arrow_forwardhy is the formation of a gas evidence of a chemical reaction? Use a molecular-level drawing in your explanation.arrow_forward
- ixing an aqueous solution of potassium nitrate with an aqueous solution of sodium chloride does not result in a chemical reaction. Why?arrow_forwardConsider the following generic equation: H+(aq)+ B(aq)HB(aq)For which of the following pairs would this be the correct prototype equation for the acid-base reaction in solution? If it is not correct, write the proper equation for the acid-base reaction between the pair. (a) nitric acid and calcium hydroxide (b) hydrochloric acid and CH3NH2 (c) hydrobromic acid and aqueous ammonia (d) perchloric acid and barium hydroxide (e) sodium hydroxide and nitrous acidarrow_forwardIt is stated in Section 6.3 of the text that to balance equations by inspection you start “with the most complicated molecule.” What does this mean? Why is it best to do this?arrow_forward
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