Concept explainers
(a)
Interpretation: The balanced equation for the combustion reaction of ethanol is to be stated.
Concept introduction: Any chemical change can be illustrated by means of a chemical equation. Chemical equation involves representation of the reactants along with their phases on left side and that of products on right side. In balanced equation, the coefficient of the participants helps in balancing the atoms of elements on either side.
(b)
Interpretation: The balanced equation for the reaction of lead (II) nitrate and sodium phosphate resulting in precipitate formation of lead (II) phosphate along with aqueous sodium nitrate is to be stated.
Concept introduction: Any chemical change can be illustrated by means of a chemical equation. Chemical equation involves representation of the reactants along with their phases on left side and that of products on right side. In balanced equation, the coefficient of the participants helps in balancing the atoms of elements on either side.
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Chemical Principles
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- Magnesium 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_forward3.14 A number of compounds are used in cement, and reactions among them occur when water is added. In one, CaO reacts with Al2O3 and water to form Ca3Al2(OH)12. Write a bal- anced chemical equation for this process.arrow_forwardComplete and balance the equations of the following reactions, each of which could be used to remove hydrogen sulfide from natural gas: (a) Ca(OH)2(s)+H2S(g) (b) Na2CO3(aq)+H2S(g)arrow_forward
- Silicon is produced for the chemical and electronics industries by the following reactions. Give the balanced equation for each reaction. a. SiO2(s)+C(s)Si(s)+CO(g) b. Silicon tetrachloride is reacted with very pure magnesium, producing silicon and magnesium chloride. c. Na2SiF6(s)+Na(s)Si(s)+NaF(s)arrow_forwardWhen organic compounds containing sulfur are burned, sulfurdioxide is produced. The amount of SO2 formed can be determined by the reaction with hydrogen peroxide: H2O2(aq)+SO2(g)H2SO4(aq) The resulting sulfuric acid is then titrated with a standard NaOH solution. A 1.302-g sample of coal is burned and the SO2 is collected in a solution of hydrogen peroxide. It took 28.44 mL of a 0.1000-M NaOH solution to titrate the resulting sulfuric acid. Calculate the mass percent of sulfur in the coal sample. Sulfuric acid has two acidic hydrogens.arrow_forward
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