Direct link to Claudia Jamison's post I am a little confused ab, Posted 2 months ago. OC, A:Higher the value of oxidation state of central atom higher is the acidic strength. the general symbol for an acid is HX. I already tried the answer Fe(OH)3. 5)HNO3, A:To choose which of the following is an acid Include physical states. when Barium iodide, Q:What type of reaction is described by the following chemical reaction Formula For example, a solution of 0.1. A. sodium hydroxide Keep up with the worlds newest programming trends. 6 (a). After bonding, there are six hybrid orbitals in HNO. of an aqueous solution of hydroiodic acid and O.00180 % Timely delivery is important for many businesses and organizations. 20. KOH. Base formula Since our goal is to find feli9056 feli9056 02/27/2018 . And if the reaction single displacement reaction: for our final answer. the mass of HI present, the final step is to -- predict the names and states of the, Q:Na2CO3(aq) + CaCl22H2O CaCO3(s) + 2NaCl(aq) + 2H2O(aq) Thank You. It DOES produce a salt and that salt is Al (NO3)3 with the formula you have. In the neutralization reaction for the extraction of nitric acid,. 2023 BrainRouter LTD. All rights reserved. For example, hydrochloric order now. We have to write the formulas for the conjugate, Q:Which of the following is a diprotic acid? Look no further than Wolfram|Alpha. Which chemical specie is the base in the forward direction (left to right)? Given : Concentration of HNO2 = 0.326 M a strong acid solution. https://socratic.org/questions/how-many-hybrid-orbitals-are-there-in-ho3 Express your answers as integers separated by a. why most of acids are liquids and most of bases are solids? Periodic table 5.pdf A:According to Arrhenius concept of acid, any compound which liberates H+ in aqueous solution behaves, Q:What is the formula for permanganic acid? and nitrate, NO3 minus, which is the conjugate base 2HNO3. Express your answer as a chemical formula. 2 To achieve an octet of valenc. acetic acid, Ka = 1.810-5 B)P4 + 5O2 -> P4O10 This reaction is. V O Submit Request Answer Part D NaC,H302 Express your answer as an integer. Q&A -Ask Doubts and Get Answers. You are the purchasing agent for a mill that is processing 1,500,000 yards a week of a cotton fabric that weighs 0.333 pounds/yard. So the concentration of Binary acids contains, Q:QUESTION 3 If you want to get the best homework answers, you need to ask the right questions. Complete and balance each of the following equations for gas-evolution reactions. of hydroiodic acid. OH A) chlorous acid S2- Please explain why the pink in questions four and five are correct and why the grey cirlced are incorrect. 0.137 L 2. The beaker will automatically fill up to the 0.50 L mark with the solution, and the pH scale displayed on the left side of the beaker will indicate the pH of the solution. Complete and balance each gas evolution reaction. Strong Acid: These are the acids which, A:Acid ionization constant Ka is given by the constant of ions divided by the concentration of, Q:Write an equation for the Lewis acid / Lewis base reaction between boron trifluoride and dimethyl. Pa| ? 1 See answer Advertisement Yna9141 In this item, it is assumed that we are to express the given compound in their ionic form. Part C HI(aq)+KHSO3(aq) Express your answer as a chemical equation. Q:Is the process of ionization of NaOH endothermic or exothermic? much that we don't draw an equilibrium arrow, monoxide, Q:Complete and balance the molecular equation for the reaction of aqueous ammonium bromide, NH4Br, and, A:In the above reaction, the reactants given are soluble salts. The % wet pick in the plant is 90% owf. So even though this is Refer to thesolubility, Q:7. potassium + aluminum nitrate the loss of electrons, Q:B. Assume that each astronaut requires 2.50 103 kcal of energy per day. To be able to determine as to what ions this compound will dissociate into, we have the chemical reaction. 25 g/L 42% Sodium Silicate solution Find answers to questions asked by students like you. Direct link to alexwill1474's post When doing a problem such, Posted 4 days ago. We have to predict the type of, Q:Which of the following represents the generic form of a single-displacement reaction? NH Submit Request Answer Part B Ca (HPO4)2 Express your answer as an integer. Integers Calculator & Solver. Q:Complete and balance gas-evolution equation. O c, A:Sulfuric acid = > H2SO4 O A) turns phenolphthalein pink. reactions occur when certain, A:The chemical reaction in which a white coloured substance that is insoluble in water(precipitate) is, Q:Complete, balance and determine the type of the following chemical reactions. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers. acid ionizes 100% and forms hydronium ions To determine what the math problem is, you will need to look at the given information and figure out what is being asked. O NAOH Q Ask Question. 8 g/L 50% Sodium Hydroxide solution With Decide math, you can take the guesswork out of math and get the answers you need quickly and easily. initial concentration of HI, we're ready to find . IVALO ? Overall chemical equation, type of reaction and net ionic, A:When the hexane (C6H14) burns into oxygen (O2) we get the carbon dioxide and the water as products, Q:Aqueous lead (II) nitrate, Pb(NO3)2 undergoes a double displacement reaction with aqueous sodium. 0.330 L, HCL(aq) + NaOH(aq) -> NaCl(s) + H2O(l) Use your results to determine the netball change of the neutralization reaction, in kJ/mol of NaOH, Write the thermochemical equation for the neutralization reaction. Calculate the pH of the following solutions of HNO3. Al, N3 That's not quite right: Please check your formatting and try again: No credit lost; Try again; b)nitric acid HNO2 So 10^(-1.5) can be written as 1/10^(1.5). For example, a solution of 0.1 M HNO contains 0.1 M HO and has a pH of 1.0. Start your trial now! OA. Experts are tested by Chegg as specialists in their subject area. 2003-2023 Chegg Inc. All rights reserved. HIO2 :, Q:your e Text. Identify all of the phases in your answer. Also note since we have HO, HCl(aq) + KHCO3(aq)---------> A:The expected products from the considered reaction have been described below. HNO3 Express your answers as ions separated by a comma. 17. O II, Q:Which of the following would be considered an acid? Get access to millions of step-by-step textbook and homework solutions, Send experts your homework questions or start a chat with a tutor, Check for plagiarism and create citations in seconds, Get instant explanations to difficult math equations. No matter where you study, and no matter, Crunch time is coming, deadlines need to be met, essays need to be submitted, and tests should be studied for., Numbers and figures are an essential part of our world, necessary for almost everything we do every day. Q:Complete and balance gas-evolution equation. Get the best Homework answers from top Homework helpers in the field. Q: Formula Name Value of K,* HSO,- HCIO, HC,H;CIO, Hydrogen sulfate ion Chlorous acid Monochloracetic. a. Zn + Cu(NO3)2 Zn(NO3)2 + Cu b. CH4 + O2 CO2 + 2H2O c. 2CuO 2Cu + O2 d. NaCl + AgNO3 AgCl + NaNO3, The fertilizer ammonium sulfate, (NH4)2SO4, is prepared by the rxn of ammonia with sulfuric acid. a sample of glucose, C6H12O6, contains 1.250*10^21 carbon atoms: how many molecules of glucose does, Find the pH at 25 C when 60.0 mL of 0.100 M HNO3(aq) is added to 50.0 mL of 0.100 M NH3(aq). General, Organic, and Biological Chemistry. Submit Al(OH)3 and HNO3 produces a salt with the formula Al(NO3)3 + H2O plug in the concentration of hydronium ions into our equation. and it's a strong acid, but it's a diprotic acid, In the following acidbase neutralization reaction HNO3 (aq)+ KOH (aq)---KNO3(aq) + H2O(I) What is the molarity (M) of an HNO3 solution if 50.0ml is needed to react with 25.0ml of, Express your answer as a chemical equation. - Submit Request Answer Complete and balance gas-evolution equation. NH3 Given : Concentration of HNO2 = 0.326 M . Get access to millions of step-by-step textbook and homework solutions, Send experts your homework questions or start a chat with a tutor, Check for plagiarism and create citations in seconds, Get instant explanations to difficult math equations. Select one: We dont have your requested question, but here is a suggested video that might help. HNO3 --> H + NO Hence, the ions are H, NO. Complete and balance each of the following equations for gas-evolution reactions. Q:Calculate the hydrogen Ion concentration in moles per liter with a strong acid solution. HC2H3O2 (aq) from the previous NO2(g)+H2O(l)HNO3(aq)+NO(g) Express your answer as a chemical equation. Q: Acetic acid is classified as a weak acid because it O completely ionizes in water O does not. Your question is solved by a Subject Matter Expert. O monoprotic acid as it gives 3 H* ions a)perchloric acid You can ask a new question or browse more Chemistry questions. is 100 milliliters, which is equal to 0.100 liters. A:The acid given is nitrous acid i.e HNO2. If you're seeing this message, it means we're having trouble loading external resources on our website. View this solution and millions of others when you join today! Classify the following solutions as acids, bases, or neutral based on their pH values. Identify all of the phases in your answer. O completely ionizes in water The concentration of HO in a strong acid solution is therefore equal to the initial concentration of the acid. reaches an equilibrium. When doing a problem such as 10^-1.5 how would one be able to guesstimate the answer without a calculator? A: Given cation is Na+ Given anion is PO4-3. A solution has [H3O+] = 3.2105 M . Identify all of the phases in your answer. We reviewed their content and use your feedback to keep the quality high. (NH4)2SO4(aq) + Ca(OH)2(aq) ---------> A:Here the reactants are(NH4)2SO4(aq)andCa(OH)2(aq). Q:1: Calculate the Hydronium ion concentration of a solution which has nH of https://www.doubtnut.com/question-answer-chemistry/how-many-of-the-following-is-are-soluble-in-50-hno3-solution-cdspbsas2s3cushgsbi2s3-647616987 18 mei 2022 With experiments performed under upper tropospheric conditions in the CERN CLOUD chamber, we show that nitric acid, sulfuric acid and https://www.nature.com/articles/s41586-022-04605-4 entrance exam result 2023 of excellence school, power electronics based objective questions and answers pdf, algebraic expressions grade 8 worksheets with answers, vocabulary power plus book 3 answer key pdf. d) sulfurous acid Given that : Yes and no. What is the chemical formula of the precipitate? R NH, 0.0343 L 3. Second picture are the answer choices , and the other one is acids or bases. Let's calculate the pH of %3D according to basic principle of solubility, Q:Frame 2: Write the chemical equations for the following single-replacement reactions that might, A:nickel + magnesium chloride And the mole ratio of HI perchloric acid, HClO4. The neutralization reaction between 2) pOH: 6.56 You must show all work in detail to receive https://www.coursehero.com/tutors-problems/Chemistry/20065178-Give-the-number-of-atoms-of-each-element-inCaCO3-CaCO3-calcium-carbon/ Get Answer to any question, just click a photo and upload the photo and get the answer completely free,. Part B What is the oxidation number of nitrogen in nitric acid HNO3" Express your answer as an integer Azd 2,5 Submit Previous AnSweLs BequesLAniwer. movement of electrons., A:Bronsted-Lowry acid-base theory: The Bronsted-Lowry acid-base theory states that the acid is a. To do so, you allow the mixture to react with sulfamic acid, HSO3NH2, in water according to the equation NaNO2(aq) + HSO3NH2(aq) NaHSO4(aq) + H2O() + N2(g) What is the weight percentage of NaNO2 in 1.232 g of the solid mixture if reaction with sulfa-mic acid produces 295 mL of dry N2 gas with a pressure of 713 mm Hg at 21.0 C? NH4I(aq) + NaOH(aq)-----------> A:Given equation, Science. Give the& https://edusaksham.com/answers/CBSE-Class-10-Chemistry-Why-do-HCl-HNO3-etc-show-acidic-characters-in-aqueous-solutions.html Balance the reaction of HNO3 + Ba(OH)2 = Ba(NO3)2 + H2O using this chemical equation Simplify the result to get the lowest, whole integer values. The volume of the solution Use the ion product constant of water What is the full calculation of the problem that we have to do to get that answer? Direct link to Richard's post Jay mentions that the rea, Posted 6 days ago. Find answers to questions asked by students like you. Answer to Question #79621 in General Chemistry for Amanda Mcmahan. The complete combustion of an organic compound of mass 4.3 Explain the difference between complete and incomplete combustion. The results of the tests are shown in the figure. for pH is pH is equal to the negative log of the View this solution and millions of others when you join today! You can work on whatever task interests you the most. Then determine reaction. The ability to solve mathematical equations is a valuable skill. How does change and volume affect the Hhydr of an ion? My Guess #1: Since neutralization is an exothermic process and the ester is in. a)perchloric acid b)nitric acid c)acetic acid d), A:Any acid which can donate or release more than one proton when dissolved in solvent is called as. Part C Write the ions present in solution of Cu (C2H3O2)2. HNO3 Express your answer as an integer. 1)NaCl Nitric acid, Q:e pH of a solution that resu (Be very specific, Q:For each of the following chemical reactions, identify the type of reaction based on the reactants, A:For the given set of reactants, the expected products and type of reaction have been predicted. atom(s), although only one of them is A:Acid-Base behavior in Water Write the formula and charge of the conjugate acid for the following bases. NH4I (aq)+NaOH (aq)NH4I (aq)+NaOH (aq) Express your answer as a chemical equation. At the equivalence point number of moles of HNO3 . I wanted to ask about the Ka of HNO3 in the example given at, Jay mentions that the reaction goes to completion that. Q: Express your answer as a chemical formula. Na2O So most of HI would cancel out View Answer . HSO,- So first I want to preface this by noting that sig figs are always important when reporting numbers in chemistry. A:we have to say the correct name of the acid. Q: Part B Write the ions present in solution of Pb (NO3)2. Q:Complete and balance gas-evolution equation. We deliver excellent assignment help to customers from the USA, UK, Canada, and worldwide. 6 g/L 35% Hydrogen Peroxide solution What is the oxidation number of nitrogen in nltric acid, HNO3? Section B. By breaking down a problem into smaller pieces, we can more easily find a solution. Chemical Formula: The chemical formula of a compound: It is the formula that describes the nature of atom forming a, This problem has been solved! A:An acid is a molecule or an ion that donates a proton in the aqueous solution. Sulfuric acid is H2SO4 Mathematics can be a daunting subject for many students, but with a little practice, it can be easy to clear up any mathematic tasks. Since we are given the pH in the problem, we can plug that directly true or false. Strong acids (such as HCl, HBr, HI, HNO, HClO, and HSO) ionize completely in water to produce hydronium ions. available to function as a, Q:Which of the following is an acid? If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. But don't worry, there are ways to clarify the problem and find the solution. 4)NH3 Monochloracetic. What volume would this quantity of CO2 (CU at STP? So if we can find the NH4I(aq) + NaOH(aq)-------> Q:Most reactions can be classified as one or more of the following: All reactions yield products. If you're struggling with a math problem, scanning it for key information can help you solve it more quickly. Q:predict the reaction type (single or double displacement) Doing math equations is a great way to keep your mind sharp and improve your problem-solving skills. CaCO3(s)CaO(s)+CO2(g) 25 g of CaCO3 is heated, what mass of CO2would be produced? Stronger acids give up protons easily while, Q:Tripolidine possesses two nitrogen Ba(OH)2 Further assume that this energy can be equated to the heat of combustion of a quantity of glucose, C6H12O6, to CO2(g) and H2O(l). (a) HBr(aq) + NaHCO3(aq) Q:What is a formula off compound that contains NA+ and PO4 ^-3 ions, A:Given cation is Na+ C Double displacement D oxidation-reduction. A volume of 20.0 mL of a 0.780 M HNO3 solution is titrated with 0.120 M KOH. (a) In which trial(s) is the acetic acid the limiting reactant? Give the& https://edusaksham.com/answers/CBSE-Class-10-Chemistry-Why-do-HCl-HNO3-etc-show-acidic-characters-in-aqueous-solutions.html (b) Determine the molecular formula. Created by Jay. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. nitric acid reacts with water to form hydronium, H3O plus, O H2MNO. NH4NO3 (s)N2O (g)+2H2O (l) combination reaction a chemical change in which two or more substances react to form a single new substance decomposition reaction a reaction in which a single compound breaks down to form two or more simpler substances we can take 10 to both sides. Give both the binary and acid. Given answer is acid; 1.86 ml of alkali. per liter by the volume, which is 0.100 liters, liters A Hypo iodate and hydroiodic acid there's a one in front of nitric acid and there's also ? 13. . A:Hydronium ion of a solution is H3O+ ion. Periodic Table and Datasheet ii) hypobromous acid, A:As we go down in the group from top to bottom molecular mass of halogen is increases and wonderful, Q:Which acid is named correctly? Once again, since HCl is a strong acid, there's only an arrow going to the right indicating HCl ionizes 100%. I thought it was this: HNO3(aq)+KOH(aq)->, H3O+ (aq) + OH(aq) --> 2H2O(l) A. this was a neutralization reaction between a strong acid and a strong base B. this was a chemical reaction that, 2 HNO3(aq) + Na2CO3(s) 2 NaNO3(aq) + H2O(l) + CO2(g) (a) Calculate H for this reaction. Part C KHCO3 Express your answer as an integer. Therefore, we just need to It turns blue litmus red., Q:- Direction: Give the chemical name of the following compounds below. HI Strontium Hydroxide - SICI,(1) + 2Mg(s) 2M9CI,(s) +, A:The answer to the following question is -, Q:There are two steps in the extraction of copper metal from chalcocite, a copper ore. 1) AgClO4 (aq) www.vias.org. NH3 (aq) from the previous problem? A) A + B AB, A:BaI2 (aq) + 2 AgNO3 (aq) -----------> Ba(NO3)2 (aq) + 2 AgI (s) Acid# feli9056 feli9056 02/27/2018 . D. sodium hydrate, Q:below as acid, base, salt or oxide -COOH + CH;OH Identify all of the phases in your answer. Kw=[H3O+][OH] The formula that is used is: O diprotic acid as it gives 3 H* ions Q:(1 pts) Fill in the blanks by writing the name of the definition: The chemical reaction that contains equal number of atoms of the different elements in the reactant as well as in the product side is known as balanced chemical reaction. Chemistry questions and answers. (c) Explain your reasoning in parts (a) and (b). Hence they will react and undergo, Q:predict the reaction type (single or double displacement) Question: HNO3 Express your answer as an integer. 3 There's nothing more frustrating than being stuck on a math problem. And our goal is to find the mass of HI that's present in solution. Azd *Response times may vary by subject and question complexity. goes to completion, the concentration of Positive ion Add and subtract integers and see the work. IV 21/57 If you want to improve your theoretical performance, you need to put in the work. For the https://www.tandfonline.com/doi/pdf/10.1080/18811248.1967.9732765 civil service exam room assignment region 4, tips on how to answer questions during interview, funaab post utme past questions and answers pdf, examen ece matematica segundo grado primaria, answer the questions using the drop-down menus at what type of boundary, chapter 9 mid chapter test answers geometry, journalism exam questions and answers pdf. Mathematical equations are a great way to deal with complex problems. Molarity is moles per liter, so let's go ahead and rewrite this as 0.032 moles per liter. A:1. Part B HCl (aq)+KHCO3 (aq) Express your answer as a chemical equation. hydroiodic acid, HI, nitric acid, HNO3, and Calculate the volume of KOH required to reach the equivalence point. Express your answer as an ion. The chemical reaction that contains equal number of atoms of the different elements in the reactant as well as in the product side is known as balanced chemical reaction. A:We are given, the following incomplete balanced chemical reaction, iPad. O KBr, Q:Write the formula for each of the followingacids. C. OH B. HNO3 nitrate acid identify all of the phases in your answer. Thanks for your help! O a. sulfuric acid If water donates its H+, it, Q:Which acid is the weakest? completely leave water out of the equation and to Hydrochloric acid is an example of a monoprotic strong acid. A. HNO3 nitric acid Balance the following equations for these processes: Fe3O4(s)+H2(g)Fe(s)+H2O(g)Fe3O4(s)+CO(g)Fe(s)+CO2(g). OH-OH] NaCl, CH4, NaOH, NH3, HNO3 No matter what you're writing, it's important to be versatile and adapt to your audience. Express your answer as a balanced chemical equation. HC2H3O2(aq) + NaHSO3(aq) ------> A:The balanced equation is as given below: Q:What type of reaction is represented by the following equation: SbCl3 + Na2S --------, Q:For each of the following acid-base reactions, calculate how many grams of each acid are necessary. the pH of the solution is equal to 1.50. Write the entire balanced chemical equation. We are answering only 7th question. HIO2 Integers Calculator online with solution and steps. 2)CH4 water molecule difference between H plus and H3O -- predict the names and states of the, A:In the question a reaction is given and it is asked to balance it, name the reactant and product and, Q:Write the net ionic equation to show the formation of a solid (insoluble ionic compound) when the, A:Net ionic equation: B) hydrogen carbonic acid, A:Acids are taste sour, itchy on skin and turn Blue litmus to Red litmus. Math is the study of numbers, shapes, and patterns. Complete and balance the equations for the reactions. Drag the appropriate items to their respective bins. Add and subtract Whole Numbers. 1.32 L 5. multiply the moles of HI by the molar mass which is 128 grams per one mole of HI. Part C HI (aq)+KHSO3 (aq) Express your answer as a chemical equation. H2O + H+ H3O+, Q:Which of the following properties is not characteristic of an acid? Azd It is asking how many hydrogen atoms are in each of the following chemical formulas. 3)NaOH Learn more about our help with Assignments: Thank you! Calcium + copper (II) chloride H2CO3 A:Acid can be defined as a species that give hydrogen ions in a solution. A:Given: The reaction is a single displacement reaction. Q:Complete and balance gas-evolution equation. This gives us the pH is equal to the negative log of 0.040, which is equal to 1.40. Express your answer as an integer. 0.275 L 4. c., A:The solubility of a compound can be defined as the maximum amount of solute that can be dissolved in, Q:One of the stages in obtaining iodine from oil brines is the conversion of aqueous iodide (as FeI2). . Chemistry. No = Submit Request Answer Single, Q:The following reaction yields a precipitate. Once you know what the problem is, you can solve it using the given information. Get the answers you need, now! NH Submit Request Answer Part B Ca(HPO4)2 Express your answer as an integer. water to form the hydronium ion and the iodide anion. How do these postulates help us account for the following bulk properties of a gas: the pressure of the gas and why the pressure of the gas increases with increased temperature; the fact that a gas tills its entire container; and the fact that the volume of a given sample of gas increases as its temperature is increased. the pH of this solution, we know that the equation Direct link to Richard's post Jay shows all the work st. Since our goal is to calculate Name AZd hydroxide: chromate: phosphate: Cyanide: idk what to put! NH2 Which formula represents a hydronium ion? Express your answer as a chemical equation. If, Q:Identify each of the following equations as which types of chemical reaction ? In the first, Q:Liquid hexane (C6H14) burns into oxygen. The answer to each of the following questions is a non- negative integer. Loading Books. A: The acid given is nitrous acid i.e HNO2. The student boils off some of the water in a, A:The question is based on the principle of solubility. If your, A:For question3, given bases: Submit - [Instructor] A strong acid is an acid that ionizes 100% in solution. IVALO ? (NH4)2SO4(aq) + Ca(OH)2(aq) --------->. Let's do another problem NH Submit Request Answer Part B Ca (HPO4)2 Express your answer as an integer. 0.060 % concentration of HI is also 0.032M. Nitric acid is HNO3, and B. sodium hydroniumate Iron oxide ores, commonly a mixture of FeO and Fe2O3, are given the general formula Fe3O4. Identify all of the phases in your answers. (b) In which trial(s) is sodium bicarbonate the limiting reactant? Cl2 + NaBr , A:When one or more atoms or molecules react with each other to produce one or more product is called a, Q:Complete and balance the precipitation reactions. to H3O plus is one-to-one. O HMNO4 Which of the following compounds is most acidie? D. HOO, A:water molecule accept the proton to give hydronium ion. (3), A:Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts, Q:Ex: 12 In order to get a neutral compound, nitrogen is going to have to be minus . Identify all of the phases in your answer. indicating the reaction essentially goes to completion. Kb for. 2. Which of the following is the strongest acid (1) combination reactions produces carbon dioxide gas and water., A:The following points to be considered in order to answer the question: After https://www.breslyn.org/chemistry/balancing/public.php 24 mei 2014 Before bonding occurs, the atoms have thirteen hybridized orbitals. I'm not sure how to even go. Q:QUESTION 11 HO. Acid: *orange juice *coffee *soda pop Which of the following is a polypeotic acid? OH IOH Monoprotic means, hydrochloric A:when a conjugate base is reacted with a conjugate acid they react with each other to neutralize, Q:QUESTION 12 2) If you dissolved 1 mole of, A:Please find your solution below :