Translate the sentence into an inequality.
Write the balanced equation for the complete combustion of stearic acid (C18H36O2) to gaseous products. {{courseNav.course.mDynamicIntFields.lessonCount}} lessons - Definition, Testing & Statistics, Texas Teacher Retirement & Social Security, About the TOEIC Listening Comprehension Section, Tech and Engineering - Questions & Answers, Health and Medicine - Questions & Answers, How to balance the following equation: HNO_3 (aq) + Ba(OH)_2 (s) rightarrow Ba(NO_3)_2 (aq) + H_2O (l). We will treat this whole polyatomic ion as one atom.
This describes … Use coefficients; place them in front of the compounds as needed. If there is no coefficient in front of the chemical formula, that means the coefficient is equal to one. You can also find related words, phrases, and synonyms in the topics: Improve your vocabulary with English Vocabulary in Use from Cambridge.Learn the words you need to communicate with confidence.
What is the volume of Raj's classroom? Q_c: C_2H_6 (g) + O_2 (g) <---> CO_2 (g) + H_2O(g) Include the physical states of all reactants and products in your balance, Conductor of reactions Using balanced chemical equations, explain the observed conductivity at the point of faint pink indicator color (phenolphtalein) for: (a) The addition of ammonia to acetic acid. the sum of a number times 3 snd 27 is at most -19.
Note that a line is continuous and defined on the real line. Found inside – Page 436.1 Writing Chemical Equations A chemical equation is a shorthand way of describing a chemical reaction. It uses symbols of elements and formulas of compounds in place of words to describe a chemical change or reaction. Use the variable to represent Raj's savings.
A formula is a set of instructions for creating a desired result. Found inside – Page 4CHEMISTRY EQUATIONS & ANSWERE HOW TO BALANCECHEMICAL EQUATIONS Molecular Structure of Hydrogen | | f I | | S I | W f | I H A chemical equation is a theoretical or written representation of what happens during a chemical reaction. MathCAD is a unique powerful way … Let's take a look at this chemical equation. Found inside – Page 58Chemical Reactions : The process in which a substance undergoes change to produce new substances with new properties are known as chemical reactions. Chemical Equation : The qualitative representation of a chemical reaction in a short ... Let's take a look at a few more example equations and techniques that can be used to balance each one. The molecule increasingly becomes overall more nonpolar and therefore less soluble in the polar water as the carbon chain becomes longer. When balancing chemical equations, we first need to count the different atoms on the reactants side and the products side. Chemical equations can be 'balanced,' similar to algebraic equations, based on the reactions of the substances involved. A coefficient is a number that we place in front of a chemical formula. To describe small-amplitude wave-like phenomena, the basic equations are linearized. | Differentiated Instruction Resources, AP European History: Homework Help Resource, 6th Grade Earth Science: Enrichment Program, Human Growth & Development Studies for Teachers: Professional Development, ORELA Middle Grades Math: Basic Algebraic Expressions, AEPA Middle Grades Math: The Coordinate Graph, Quiz & Worksheet - Meaning of Thane of Cawdor in Macbeth, Quiz & Worksheet - The Story of an Hour Setting & Characters, Quiz & Worksheet - Types of Circumstantial Evidence, Once More to the Lake: Summary, Theme & Analysis, What is Antimicrobial Resistance? The chemical equation is now balanced. The chemical equation is now balanced. The chemical equation needs to be balanced so that it follows the law of conservation of mass. 41 is the sum of 16 and Malik's age . Five less than the product of 11 and Julie's savings Use the variable j to represent Julie's savings. A chemical equation shows us the substances involved in a chemical reaction - the substances that react (reactants) and the substances that are produced (products). For atoms involving polyatomic ions, the general technique is to count the whole polyatomic ion as one atom, balance these first, and then, balance the rest of the atoms. For combustion reactions, the technique is to balance the carbon (C) atoms, followed by the hydrogen (H) atoms and then the oxygen (O) atoms. Learn more.
Six subtracted from the product of 2 and a number is at least 18 Use the variable y for the unknown number. | {{course.flashcardSetCount}}
Gail's savings increased by 17 is 46. What general represents equation chemical essay explain points that you dont give up the famous resistance fghters djamila bouhired and zohra drif. Use the variable c for the unknown number. In this reaction, our polyatomic ion, which we will count as one atom, is SO4. The sodium (Na) atoms double and the PO4 is now balanced on both sides. Found inside – Page 42The upper portion of the shell is called the carapace ; the lower portion is called the plastron . chemical affinity See affinity . chemical ... This can be written in a chemical equation as : 2Na + 2H2O → 2NaOH + H2 The substances ... Found inside – Page 37CHEMICAL REACTIONS AND EQUATIONS Chemical reactions occur when substances are changed to other substances through the breaking and formation of chemical bonds . For example , water is produced by the chemical reaction of hydrogen and ... Enrolling in a course lets you earn progress by passing quizzes and exams.
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All rights reserved. Hydrochloric acid is an acid because it has hydrogen ion.The formula for hydrochloric acid is HCl.It is a strong acid. 7 increased by twice Malik's savings. The product of Greg's age and 6 is 102. Equations appear frequently in mathematics because mathematicians love to use equal signs. The product of 7 and diego'so savings is 112. Is this correct? This means that the number of different atoms involved in the substances reacting must remain unchanged after the reaction occurs. Use the variable g to represent Greg's age. chemical reaction in a sentence form is quite long.
TRANSLATE THE FOLLOWING CHEMICAL EQUATION INTO A SENTENCE. Found inside – Page 1438.1 The Chemical Equation 8.2 Writing and Balancing Chemical Equations 8.3 Information in a Chemical Equation 8.4 Types of Chemical Equations 8.5 ... From early childhood, we are taught to translate our ideas and desires into sentences. Translate this sentence into an equation. We need to make use of another coefficient in front of H2. Found inside – Page 123Which of the following statements about chemical reactions is false ? a . When balancing a chemical equation , all subscripts must be conserved . b . When one coefficient is doubled , the rest of the coefficients in the balanced ... Translate this phrase into an algebraic expression. an element affecting a process : factor. Found inside – Page 143CHEMICAL. EQUATIONS. I. n in taught the a concise, world to translate today, useful we our manner. continually ideas strive to express information CHAPTER OUTLINE From early childhood, we are and desires into sentences. Found inside – Page 108We get : 2Mg + O2 2Mgo Including the state symbols ' s ' for a solid and ' g ' for a gas , we get the chemical equation : 2Mg ( s ) + 0 , ( g ) 2MgO ( s ) This is the complete chemical equation for the reaction between magnesium and ... Hydroxyl groups (-OH), found in alcohols, are polar and therefore hydrophilic (water liking) but their carbon chain portion is non-polar which make them hydrophobic. This reaction is not balanced. use variable m represent Malik's age . An iterative scheme is used to solve the linearized system of difference equations. Found inside – Page 349C.1 Introduction A chemical reaction can be represented by an equation, which should be in accordance with the laws of conservation of mass, atoms and charge. Hence for chemical equations, the mass of the reactants should be equal to ... To do this, we need to put a coefficient of 4 in front of Fe in the products side. The technique is to treat the whole polyatomic ion as if it is only one atom. An error occurred trying to load this video. Chemical Equation Overview & Components | What is a Chemical Equation?
As a result, the chemical equation that shows the chemical reaction needs to be balanced. The sum of 9 times a number and 6 equals 4 . We do this by making it so that there are 6 oxygen atoms on each side. To fully describe the momentum of a 5-kg bowling ball moving westward at 2 m/s, you must include information about both the magnitude and the direction of the bowling ball. All atoms of an element have identical chemical properties and mass whereas, atoms of different elements have different chemical properties and masses. This is a reaction between ferric oxide (Fe2O3) and carbon (C), producing Iron (Fe) and carbon dioxide (CO2). The hydrogen (H) atoms are now balanced. Count the atoms of each element in the reactants and the products. I feel like it’s a lifeline. Found inside – Page 58Chemical Reactions : The process in which a substance undergoes change to produce new substances with new properties are known as chemical reactions. • Chemical Equation : The qualitative representation of a chemical reaction in a short ... Create your account, {{courseNav.course.topics.length}} chapters | According to the law of conservation of mass, the mass of the reactants should be equal to the mass of the products when a chemical reaction occurs. There are 4 hydrogen (H) atoms on the reactants side and 2 hydrogen (H) atoms on the products side. Chemical Reactions and Balancing Chemical Equations, Decomposition Reaction | Examples, Characteristics and Uses, Combination Reaction: Definition & Examples, Vocabulary of Myasthenia Gravis & Muscular Dystrophy, Using Chemical Reactions to Identify Substances, Limiting Reactants & Calculating Excess Reactants, What Is a Chemical Reaction? First, we need to balance the oxygen atoms. From this model two coupled differential equations for the parallel ion velocity and the perturbed electrostatic potential were derived. algebra. You can view more similar questions or ask a new question. use variable m represent Malik's age. 0 && stateHdr.searchDesk ? Click on the arrows to change the translation direction. Found inside – Page 10Many hazardous waste substances are oxidizers or strong reducers , and oxidation - reduction is the driving force behind many dangerous chemical reactions . For example , the reducing tendencies of the carbon and hydrogen atoms in ... a complex of variable factors. I had got 6300. The first step is to balance the polyatomic ions on both sides. "95 is the product of Julie's height and 5". We conclude this introduction with a statement of the gover ning equations. Found inside – Page 111ÍÍI AMMONIA IN FILTERED WATER . know the composition of each , the result may be expressed ty a chemical equation . ... sentence ( paragraph S be the symbol of an element and an , bz , & c . , the number 2 ) in my letter ( CHEMICAL News ... Found insideIncorrect names and improperly constructed "sentences" (e.g., an invalid form of a chemical equation) are detected during the semantic analysis. The following reaction system illustrates a sample input: CRAMS input deck: /: EXAMPLE ... Use d to represent diego'so savings.
Enter a chemical species name or pattern: (e.g., methane, *2-hexene) Select the desired units for thermodynamic data: SI calorie-based; Select the desired type(s) of data: In particular, for the wave kinetic equations of energies, only the interactions between nonlinear terms involving either energies or helicities will give a contribution. Classroom Course ESE/IES (2022-23) ESE 2022-23 Coaching: ESE – Conducted by UPSC for recruitment of Class-1 engineer officers, this exam is considered to be most prestigious exam for Graduate Engineers and thus it requires a different approach than GATE to be prepared.
A chemical equation is a short way to represent a chemical reaction, the process in which substances are turned into other … Found inside – Page 69are called a balanced equation. For example, the reactants and magnesium oxide magnesium burns in air producing is the product. There are 2 atoms of magnesium oxide. magnesium and 2 atoms of oxygen On the left side of the arrow are the ... Nissa has a masters degree in chemistry and has taught high school science and college level chemistry. Found inside – Page 111III know the composition of each , the result may be expressed by a chemical equation . ... Professor Bischoff has read the sentence ( paragraph S be the symbol of an element and ai , b1 , & c . , the number 2 ) in my letter ( CHEMICAL ... Try refreshing the page, or contact customer support. To balance them, we put a coefficient of 2 in front of H2O. Translate this sentence into an equation. Get unlimited access to over 84,000 lessons. Found inside – Page viiTHE SENTENCES OF CHEMISTRY 181 Chemical Reactions and Equations: The Sentences of the Chemical Language 18 Chemical ... THE INFORMATION IN A CHEMICAL EQUATION 182 Chemical Reactions 18 Chemical Reactions 182 Expressing a Chemical ... "is" means = The technique is to balance the carbon (C) atoms first, then the hydrogen (H) atoms, and then the oxygen (O) atoms. - Definition & Examples, Substitution Reaction Examples in Organic Chemistry, Elimination Reactions In Organic Chemistry, Grignard Reagent: Formation, Synthesis & Preparation, Grignard Reaction with Alcohol, Ketone & Aldehyde, Types of Reaction Mechanisms in Organic Chemistry, The Total of All Chemical Reactions in an Organism, Chemical Synthesis: Definition & Examples, Experimental Chemistry and Introduction to Matter: Help and Review, Chirality in Organic Chemistry: Help & Review, ILTS Science - Chemistry (106): Test Practice and Study Guide, Praxis Environmental Education: Practice and Study Guide, FTCE Earth & Space Science 6-12 (008): Test Practice & Study Guide, SAT Subject Test Physics: Practice and Study Guide, Praxis Family & Consumer Sciences (5122): Practice & Study Guide, TExES Health EC-12 (157): Practice & Study Guide, SAT Subject Test Biology: Practice and Study Guide, Praxis Biology and General Science: Practice and Study Guide, Additive Alleles: Definition & Characteristics, Monophyletic Groups: Definition & Examples, What is Gene Therapy? Translate the sentence into an inequality. The coefficients of the wave equations depend on time through the wave vector, which includes the stretch effect by the rotation shear. science with mathematics to describe chemical phenomena. - Definition & Effects, Avogadro's Law and Molar Volume | Avogadro's Law Formula, Fossil Fuels, Greenhouse Gases, and Global Warming, How to Use the Quadratic Formula to Solve a Quadratic Equation.
Atoms are indivisible particles that can’t be destroyed or created through chemical reactions. Found inside – Page 67chemical elements can be compared to letters, the denotations of molecules to words, and an entire chemical formula to a sentence. The analysis of the basic signs and compounds in this system can be performed on three different levels, ... First we find the the direction vector by subtracting the two points: . If the center is at the origin then the equation is. The next step is to balance the magnesium (Mg) and sodium (Na) and chlorine (Cl) atoms. Where there is a chemical reaction, there is a chemical equation. Another question. Write a balanced overall reaction from these unbalanced half-reactions.
Use the variable b for the unknown number. Found inside – Page 61Keywords: Balancing chemical equations moles, Calculations, Calculating frame, Chemical equations, Products, Reactants, ... really does not provide us with any more information than the opening sentence of the paragraph above. Found inside – Page 242.2 Using chemical equations Instead of using word equations we can use the chemical symbols for elements and compounds to represent chemical reactions . For example , when carbon burns in a plentiful supply of oxygen , an atom of ...
The vector equation of the line through two points is the sum of one of the points and the direction vector between the two points scaled by a variable. Found inside – Page 129Chemical Reactions : The process in which a substance undergoes change to produce new substances with new properties are known as chemical reactions. • Chemical Equation : The qualitative representation of a chemical reaction in a short ... After you are finished, you should be able to: To unlock this lesson you must be a Study.com Member. Hydrochloric Acid and Sodium Hydroxide Hello,you are in right place to know about the reaction between hydrochloric acid and sodium hydroxide. Found insideAtrazine is a selective herbicide that has the molecular formula C8H14N5Cl. ... Given the following sentence, write a chemical equation using chemical symbols that convey the same information: “One nitrogen molecule reacts with three ... The next step is to balance the hydrogen (H) atoms by putting a coefficient of 3 in front of H2. How do you know if a chemical equation is balanced? something that you buy suddenly and without thinking carefully, Passing the time of day and talking shop: talking about conversations. The word graph is sometimes used as a synonym for diagram. Found inside – Page 280Can you write the chemical equation ? The final sentence in the first paragraph does not make much sense . Rewrite it in your own words , so that it does make sense . In the second paragraph , John talks about the reaction. equation: [noun] the act or process of equating. - Definition, History Pros, Cons & Examples, Y Chromosome: Definition, Disorders & Structure, Gregor Mendel: Biography, Facts & Timeline, Quiz & Worksheet - Pancreatic Acinar Cells, Quiz & Worksheet - Intracellular vs. Extracellular Digestion, Quiz & Worksheet - RNA Primer in DNA Replication, Quiz & Worksheet - The Central Dogma of Biology, Basic Molecular Biology Laboratory Techniques: Help and Review, Analyzing Scientific Data: Help and Review, Microorganisms and the Environment: Help and Review, TExES Core Subjects EC-6 (391): Practice & Study Guide, TExES School Counselor (252): Practice & Study Guide, Virginia SOL - US History 1865 to Present: Test Prep & Practice, Virginia SOL - US History to 1865: Test Prep & Practice, Biology 202L: Anatomy & Physiology II with Lab, Role of Student Support in Open & Distance Learning, TExES Principal Exam Redesign (068 vs. 268), Addressing Cultural Diversity in Distance Learning, Solving Quadratic Equations by Completing the Square, Using Scientific Notation on a Scientific Calculator, How to Make a Marketing Survey: Question Phrasing & Testing, Quiz & Worksheet - Addition & Subtraction Fact Families, Quiz & Worksheet - Function Derivative Notation, Quiz & Worksheet - Addition Rule for Limits, Flashcards - Real Estate Marketing Basics, Flashcards - Promotional Marketing in Real Estate, What is Differentiated Instruction?
A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. Found inside – Page 2649-62 What does the notation m denote when it is used in a chemical equation? 9-63 Consider the following equilibrium ... Write the chemical equation for the forward reaction. b. ... Justify your answer with a one-sentence explanation. Chemical Equation. I would definitely recommend Study.com to my colleagues. These examples are from corpora and from sources on the web. All other trademarks and copyrights are the property of their respective owners. Diagrams have been used since prehistoric times on walls of caves, but became more prevalent during the Enlightenment. We do this by putting a coefficient of 3 in front of C on the reactants side. Now that the oxygen atoms are balanced, we need to balance the iron (Fe) atoms first. The room is 12 feet high. Found inside – Page 251Using the formulas of the substances involved in the reaction, the chemical equation summarizes the chemical change that takes place. We can think of chemical equations as chemical sentences. We write them by following certain rules, ... The chemical equation is now balanced. The characteristic equations (4.48)-(4.50) do not take into account the symmetry of the fluid frame group velocity surface about the magnetic field. The hydrogen and aluminum atoms are unbalanced. The chemical equation needs to be balanced so that it follows the law of conservation of mass. We present the corresponding equations at the end of the appendix. Translating a sentence into a one-step equation. Momentum is a vector quantity.As discussed in an earlier unit, a vector quantity is a quantity that is fully described by both magnitude and direction. Found inside – Page 68TABLE 5.2 (Continued) Formulas for Chemicals Commonly Encountered in Pollution Prevention and Control Molar Mass ... 1C heptane 7 H16 + 11O 2 → 7CO 2 + 8H 2O oxygen carbon dioxide water Read the equation like a sentence: 1 mole of ... An equation is any expression with an equals sign, so your example is by definition an equation. I had used the formula V = B x H. Translate this sentence into an equation. As a member, you'll also get unlimited access to over 84,000 Found inside – Page 44Chemical equation A type of sentence that identifies the substances that enter into and are produced by a chemical reaction. Chemical reaction See “chemical change” Coefficient A number used in a balanced chemical equation to show the ... The equation is not balanced because in the reactants side, there are 2 nitrogen (N) atoms and 2 hydrogen (H) atoms. Translate the sentence into an equation. Using these equations, we can find the flow in the physical plane.
In the chemical equation, to make the number of nitrogen (N) atoms equal on both sides, first, we place a coefficient of 2 in front of NH3. The work is suitable for a general audience, as equations have been consigned to a comprehensive mathematical appendix. We first balance the magnesium atoms by putting a coefficient of 3 in front of MgCl2.
Use the variable m to represent Malik's savings. In this case, the carbon (C) atoms are already balanced. Balancing chemical equations is a process of trial and error.
Found inside – Page 123Which of the following statements about chemical reactions is false ? a . When balancing a chemical equation , all subscripts must be conserved . b . When one coefficient is doubled , the rest of the coefficients in the balanced ... Found inside – Page 129Chemical Reactions : The process in which a substance undergoes change to produce new substances with new properties are known as chemical reactions. • Chemical Equation : The qualitative representation of a chemical reaction in a short ...
Found inside – Page 124Chemical Reactions : The process in which a substance undergoes change to produce new substances with new properties are known as chemical reactions. • Chemical Equation : The qualitative representation of a chemical reaction in a short ... The number of the atoms is not balanced on both sides. algebra . On the reactants side, there is one SO4 ion, and on the products side, there are three SO4 ions. Translate this sentence into an equation: Use the variable "j" to represent Julie's height. We first need to balance the SO4 ions, and to do this, we put a coefficient of 3 in front of H2SO4. Translate this sentence into an equation. CH4 + 2O2 -> CO2 + 2H2O . Found inside – Page 116The symbol A indicates that heat is applied so that the chemical reaction will occur . If the energetics of a chemical reaction are being considered , the heat term is shown symbolically on the right side of the equation as - H when the ... Cu-------> to Cu(2+) Ag(+) ---------> to Ag Give the balanced overall reaction, and show your work. Specific rotations based on the equation [α] = (100×α)/(l×c) should be reported as unitless numbers as in the following example: [α] D 20 -25 (c 1.9, CHCl 3), where the concentration c is in g/l00 mL and the path length l is in decimeters.
Given the double displacement reaction between chromium (III) nitrate and ammonium carbonate, in the balanced equation for the reaction the coefficient of chromium (III) nitrate is ---------------- . Found inside – Page 237... word or phrase from the brackets to complete the following sentences and write balanced equations for the same. ... [10] A. (i) Write the equations when sulphur combines with : (ii) State the chemical equation for the reaction ... This time, we put a coefficient of 3 in front of H2 to balance the chemical equation. Found inside – Page 83Read through the following piece of text and break it into sentences using appropriate punctuation. ... of scattered chemical information into an organized system revised nomenclature invented the mass balance chemical equation and made ... Let's take a look at this scale. Chemistry for Aqa Co-Ordinated Award - Page 24 So now we look at the hydrogen (H) atoms. Found inside – Page 39An unbalanced equation for this reaction is NH4NO3 88n N2O + H2O Substances on the left side of the arrow are called reactants, and those on the right side are called products. We read chemical equations just like we read sentences; ... Found insideBut although both endothermic and exothermic reactions require activation energy, exothermic reactions release thermal ... Examples Q. Write out the chemical equation for the following sentence: Solid iron(III) oxide reacts with gaseous ... {{courseNav.course.mDynamicIntFields.lessonCount}}, The Arrhenius Definition of Acids and Bases, The Bronsted-Lowry and Lewis Definition of Acids and Bases, Dissociation Constant and Autoionization of Water, The pH Scale: Calculating the pH of a Solution, Coordination Chemistry: Bonding in Coordinated Compounds, Precipitation Reactions: Predicting Precipitates and Net Ionic Equations, Assigning Oxidation Numbers to Elements in a Chemical Formula, Balancing Redox Reactions and Identifying Oxidizing and Reducing Agents, The Activity Series: Predicting Products of Single Displacement Reactions, Electrochemical Cells and Electrochemistry, Writing and Balancing Combustion Reactions, What is a Conjugate Acid? The standard form for the equation of a circle with radius , and centered at point is.
In the products side, there are 1 nitrogen (N) atoms and 3 hydrogen (H) atoms. In general, a chemical equation looks like this: According to the law of conservation of mass, when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants. However, the number of hydrogen (H) atoms is not balanced on both sides. Found inside – Page 112Chemical. Equations. Symbol Explanation + Separates two reactants or products. → The “yields” symbol separates the ... You're equipped, for example, to decode a chemical equation into an English sentence describing a reaction. Found insideAnd then, are the explanatory sentences true, is the grammar true? Is Newton's formula a true sentence? ... try only to have one new particle per papen” You remember that I drew a chemical equation on the board for Glauber's salts. Found inside – Page A-24Chemical symbols are considered the letters of chemical language and formulas are considered the words of the language; chemical equations can be considered the sentences of chemical language. The combining power (or capacity) of an ... The equation above is now balanced. If you prefer to pay by credit card, you may do so by clicking on the PayPal logo.
Found inside – Page 86... the most efficient way to convey a relationship is through a mathematical or chemical equation. ... Standing alone, this sentence is a puzzle, but in the middle of a document, this sentence is a wall preventing the audience from ... It can be written in a shorter form. Found inside – Page 5-25.2 Naming compounds and word equations ›› Word equations When describing chemical reactions, chemists rarely write a full sentence. Most chemists prefer to describe chemical reactions in the format of an equation.
Equation Equation definition, the act of equating or making equal; equalization: the symbolic equation of darkness with death. Sif Chemistry Nl Tb - Page 108 Usage explanations of natural written and spoken English. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. In general, to balance an equation, here are the things we need to do: The steps are simple, but it is a process of trial and error. What can you change to balance an equation? Earn Transferable Credit & Get your Degree. Foundations of College Chemistry, Alternate - Page 143 CH4 + 2O2 -> CO2 + 2H2O, Translate this sentence into an equation: Use the variable "j" to represent Julie's height. In this section, however, we give the equations describing the stability of a general rotating plasma column. Since the wave interaction equations are linear the scattering matrix (5.23) gives the solution for c (t) for general initial data c (0). Practice always makes perfect. Basic Chemistry - Page 123