(a)
Interpretation:
The terms, strong electrolyte and weak electrolyte are to be distinguished precisely.
Concept introduction:
Solutions of substances in which the ions are the conducting species are called electrolytes. The ionization depends on the nature of the substance. Some substances are more ionized in solution and conduct more electricity. Other substances are ionized to a lesser extent and conduct less electricity. The ability of a solution to conduct electricity depends on the number of ions present in the solution.
Answer to Problem 79E
Strong electrolytes produce more number of ions in the solution and are good conductors of electricity. Weak electrolytes produce less number of ions in the solution and are bad conductors of electricity.
Explanation of Solution
Substances whose solutions are very good conductor of electricity are termed as strong electrolytes. They furnish more number of ions. Substances whose solutions are poor conductors of electricity are termed as weak electrolytes. They produce less number of ions.
Strong electrolytes produce more number of ions in the solution and are good conductors of electricity. Weak electrolytes produce less number of ions in the solution and are bad conductors of electricity.
(b)
Interpretation:
The terms, electrolyte and nonelectrolyte are to be distinguished precisely.
Concept introduction:
Solutions of substances in which the ions are the conducting species are called electrolytes. The ionization depends on the nature of the substance. Some substances are more ionized in solution and conduct more electricity. Other substances are ionized to a lesser extent and conduct less electricity. The ability of a solution to conduct electricity depends on the number of ions present in the solution.
Answer to Problem 79E
Electrolytes are able to conduct electricity. Nonelectrolytes are unable to conduct electricity.
Explanation of Solution
The substances whose solutions can conduct electricity are termed as electrolytes. The conduction of electricity is due to the presence of ions in the solution. Molecular solids cannot dissociate. Therefore, they cannot furnish ions and do not conduct electricity. Therefore, the substances whose solutions cannot conduct electricity are termed as nonelectrolytes.
Electrolytes are able to conduct electricity. Nonelectrolytes are unable to conduct electricity.
(c)
Interpretation:
The terms, strong acid and weak acid are to be distinguished precisely.
Concept introduction:
Acids are compounds which release a proton or hydrogen ion when present in a solution. Acids are classified as strong or weak on the basis of extent of their ionization.
Answer to Problem 79E
Strong acids ionize completely. Weak acids ionize partially.
Explanation of Solution
Strong acids undergo complete ionization to produce more number of hydrogen ions in the solution. Weak acids undergo partial ionization and produce less number of hydrogen ions in the solution.
Strong acids ionize completely. Weak acids ionize partially.
(d)
Interpretation:
The terms, conventional, total ionic, and net ionic equations are to be distinguished precisely.
Concept introduction:
Answer to Problem 79E
In conventional equations, all the reactants and products are written. In total ionic equation, the reactants and products are present in the form of ions. In net ionic equation, only those ions which undergo a change during the reaction are written.
Explanation of Solution
Conventional equations are those chemical equations in which all the reactants and products are written including their respective state symbols. The total ionic equations are those chemical equations in which all the ionic reactants and ionic products are written in the form of their ions. The net ionic equation is a chemical reaction which describes the exact chemical change occurring during the reaction. The spectator ions present in the total ionic equation, which do not take part in the reaction, are removed to get the net ionic equation.
In conventional equations, all the reactants and products are written. In total ionic equation, the reactants and products are present in the form of ions. In net ionic equation, only those ions which undergo a change during the reaction are written.
(e)
Interpretation:
The terms, burn and oxidize are to be distinguished precisely.
Concept introduction:
Substances are said to burn when they react with atmospheric oxygen completely to produce carbon dioxide and water. Substances are said to be oxidized when there is an increase in oxidation number and it loses electrons.
Answer to Problem 79E
Burning refers to oxidation in presence of atmospheric oxygen. Oxidizing a substance does not require atmospheric oxygen.
Explanation of Solution
Burning is a reaction in which the substance burns in air to react with atmospheric oxygen. Burning of a substance means oxidation in presence of atmospheric oxygen. Oxidizing a substance means the substance undergoes oxidation to lose electron. Oxidation does not require the presence of oxygen.
Burning refers to oxidation in presence of atmospheric oxygen. Oxidizing a substance does not require atmospheric oxygen.
(f)
Interpretation:
The terms, ion-combination, precipitation, and molecule-formation reactions are to be distinguished precisely.
Concept introduction:
During a chemical reaction, the composition of the substance undergoes a change. Chemical reactions are represented by chemical equations The chemical reactions can be classified as ion-combination precipitation, and molecule-formation reactions.
Answer to Problem 79E
In ion combination reactions, exchange of cations and anions between reactants takes place to form products. In precipitation reaction, one of the products formed is an insoluble compound. In molecular formation reactions, the exchange of cations and anions between reactants takes place to form a molecular product which does not ionize.
Explanation of Solution
Ion combination reactions are those in which the cation of one reactant reacts with the anion of another reactant to form product. The cations and anions are exchanged in the products. If the product formed is an insoluble compound, the reaction is termed as precipitation reaction. Molecular formation reactions are those ion combination reactions in which one of the product formed is a molecular compound and does not undergo ionization.
In ion combination reactions, exchange of cations and anions between reactants takes place to form products. In precipitation reaction, one of the products formed is an insoluble compound. In molecular formation reactions, the exchange of cations and anions between reactants takes place to form a molecular product which does not ionize.
(g)
Interpretation:
The terms, molecule-formation and neutralization reactions are to be distinguished precisely.
Concept introduction:
During a chemical reaction, the composition of the substance undergoes a change. Chemical reactions are represented by chemical equations. The chemical reactions can be classified as ion-combination, precipitation, and molecule-formation reactions and neutralization reactions.
Answer to Problem 79E
In molecular formation reactions, the exchange of cations and anions between reactants takes place to form a molecular product which does not ionize. In neutralization reactions, acid and base react together to form salt and water.
Explanation of Solution
Molecular formation reactions are those ion combination reactions in which one of the product formed is a molecular compound and does not undergo ionization. Neutralization reactions are the reaction between acid and base to get the respective salt and water.
In molecular formation reactions, the exchange of cations and anions between reactants takes place to form a molecular product which does not ionize. In neutralization reactions, acid and base react together to form salt and water.
(h)
Interpretation:
The terms, acid, base and salt are to be distinguished precisely.
Concept introduction:
In neutralization reactions, acid and base react together to form salt and water. Acids are substances which give a proton in solution. Bases are the substances which give hydroxyl ion in the solution.
Answer to Problem 79E
Acids give hydrogen ion in solutions. Bases give hydroxyl ion in solutions. Salts are ionic compounds formed by reaction of an acid with a base.
Explanation of Solution
Acids are substances that give hydrogen ion in solution. They can also be defined as the class of compounds that accept a pair of electrons in electron transfer reactions. Bases are substances that produce hydroxyl ion in solution. They can also be defined as the class of compounds which donate a pair of electrons in electron transfer reactions. Salts are formed during the reaction of an acid and a base. They are usually ionic in nature.
In molecular formation reactions, the exchange of cations and anions between reactants takes place to form a molecular product which does not ionize. In neutralization reactions, acid and base react together to form salt and water.
Want to see more full solutions like this?
Chapter 9 Solutions
Introductory Chemistry: An Active Learning Approach
- Please correct answer and don't used hand raitingarrow_forwardPlease correct answer and don't used hand raitingarrow_forward(a) The following synthesis of the molecule shown in the circle has a major problem. What is this problem? (2 pts) 1) HBr (no peroxides) 2) H- NaNH2 Br 3) NaNH, 4) CH3Br 5) H2, Pd (b) Starting with the molecule shown below and any other materials with two carbons or less, write out an alternate synthesis of the circled molecule. More than one step is needed. Indicate the reagent(s) and the major product in all the steps in your synthesis. (5 pts) 2024 Fall Term (1) Organic Chemistry 1 (Lec) CHEM 22204 02[6386] (Hunter College) (c) Using the same starting material as in part (b) and any other materials win two carpons or less, write out syntheses of the circled molecules shown below. More than one step is needed in each case. Indicate the reagent(s) and the major product in all the steps in your synthesis. You may use reactions and products from your synthesis in part (b). (5 pts)arrow_forward
- alt ons for Free Response Questions FRQ 1: 0/5 To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt and some inert materials, solutions with known [Co?) are prepared and absorbance of each of the solutions is measured at the wavelength of optimum absorbance. The data are used to create a calibration plot, shown below. 0.90- 0.80- 0.70 0.60 0.50 0.40- 0.30 0.20- 0.10- 0.00- 0.005 0.010 Concentration (M) 0.015 A 0.630 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted with water to a final volume of 50.00 ml. Assume that all the cobalt in the ore sample is converted to Co2+(aq). a. What is the [Co2] in the solution if the absorbance of a sample of the solution is 0.74? 13 ✗ b. Calculate the number of moles of Co2+(aq) in the 50.00 mL solution. 0.008 mols Coarrow_forwardPlease correct answer and don't used hand raitingarrow_forwardCloso-boranes and arachno-boranes are structures that exhibit B-B, B-H-B, and B-H bonds. Correct?arrow_forward
- Indicate why boron hydrides cannot form large linear or planar structures.arrow_forwardNido-boranes are structures with the molecular formula BnHn+4 that exhibit B-B, B-H-B and B-H bonds. Correct?arrow_forward8:07 AM Wed Dec 18 Final Exam 2024 copy Home Insert Draw Page Layout Formulas Data Review AA 田 General A G fx Alexis Cozort ☑ ⚫ 61% A B D E F H K M N P R S T U 3+ 10 125 mM that yielded peak heights of Aa = 9 1-(a)A sample solution was examined under XRF to quantify the analyte Ce³+. Find the response factor F, when standardized concentration of analyte [Ce³+]A = concentration of internal standard S i.e. [In³*]s = 151 mM was spiked with standardized 1600 and As = 3015 respectively? 11 12 (i)Define F, F = Aa As [A] [S] + X 13 (*Define with variables) 4000 14 15 (ii)Calculate F, F = numeral (You will use the F value in part 1-(b) below) As 16 (*Calculate with numerals) 17 18 1-(b)To determine the unknown conc of analyte [Ce³+], a volume of 15 mL of internal standard S having a concentration [In³+]s = 0.264 M 19 20 was added to 45 mL of unknown, and the mixture was diluted to 100 mL in a volumetric flask. XRF analysis yielded a spectrum, Figure-1, where peak heights A and As are…arrow_forward
- All structural types of Boron hydrides exhibit B-B, B-H-B and B-H bonds. Correct?arrow_forwardN-nitrosodimethylamine (NDMA) is a suspected carcinogen that can form via reactions between dimethylamine (DMA) and monochloramine (NH2Cl). The relevant elementary reactions and the corresponding rate constants are as shown below. Reaction Rate constant (M¹s¹) DMA + NH2Cl = DMCA + NH3 k =1.4×10-1, kr = 5.83×10-3 1.28×10-3 DMA + NH2Cl → UDMH UDMH + NH2Cl → NDMA -> 1.11×10-1 If the initial concentrations of DMA and NH2Cl are given, you should be able to predict the concentrations of all species at any given reaction time. Please write down the rate equations for DMA, NH2C1, DMCA, UDMH and NDMA.arrow_forwardYou wish to add enough NaOCl (sodium hypochlorite) to a 150 m³ swimming pool to provide a dose of 5.0 mg/L TOTOCI as Cl2. (a) How much NaOCI (kg) should you add? (Note: the equivalent weight of NaOCl is based on the reaction: NaOCl + 2H + 2 e→CI + Na +H₂O.) (10 pts) (atomic weight: Na 23, O 16, C1 35.5) (b) The pH in the pool after the NaOCl addition is 8.67. To improve disinfection, you want at least 90% of the TOTOCI to be in the form of HOCI (pKa 7.53). Assuming that HOCI/OCI is the only weak acid/base group in solution, what volume (L) of 10 N HCl must be added to achieve the goal? (15 pts) Note that part a) is a bonus question for undergraduate students. If you decide not to work on this part of the question, you many assume TOTOCI = 7×10-5 M for part b).arrow_forward
- World of Chemistry, 3rd editionChemistryISBN:9781133109655Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCostePublisher:Brooks / Cole / Cengage LearningIntroductory Chemistry: An Active Learning Approa...ChemistryISBN:9781305079250Author:Mark S. Cracolice, Ed PetersPublisher:Cengage LearningLiving By Chemistry: First Edition TextbookChemistryISBN:9781559539418Author:Angelica StacyPublisher:MAC HIGHER
- Chemistry for Today: General, Organic, and Bioche...ChemistryISBN:9781305960060Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. HansenPublisher:Cengage LearningGeneral Chemistry - Standalone book (MindTap Cour...ChemistryISBN:9781305580343Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; DarrellPublisher:Cengage Learning