When converting from a word equation to a a balanced chemical equation what is added? 0000002726 00000 n J.R. S. tutor. All of the above are evidence of a chemical change, All of the above are evidence of a chemical change. - NH4Cl+ KOH --> KCl + NH3 + H2O Which of the equations represents a reversible reaction? Which of the following is the balanced single replacement reaction that occurs when tin reacts with hydrochloric acid? 6.9 6.934 16 15.60. Enter the balanced net ionic equation. 0000003456 00000 n Webto the following (unbalanced reaction). 0000003189 00000 n Press question mark to learn the rest of the keyboard shortcuts. 0000059812 00000 n Get the best results here. Mg+HCL---MgCl2=H2 Mg-1. Energy may be either absorbed or released during a reaction. 2 Mg, 4 N, 12 O. Select the balanced equation that represents the combustion of octane, C8H18. Mg + 2HCl MgCl2 + H2 Chemistry Electrochemistry Oxidation and Reduction Reactions. Its not possible to answer that question without doing rate experiments. It is also complicated by the fact that Mg is in the solid phase, and so We reviewed their content and use your feedback to keep the quality high. [ans]. WebCommercial brass is an alloy of Cu and Zn. indication of why you can't access this Colby College website. Which of the following is the balanced single replacement reaction that occurs when rubidium reacts with water? ]&[cqd_[I75wTWP) The concentration of HCl: 3.0 mol/L. In the experiment H2 = 749.2 19.89 = 729.31 mm of Hg = P 1 Volume of H 2(g) = 38.2 mL = 0.0382 L = V 1 12/16/20. trailer how many molecules are in it? What is the biggest disadvantage to using word equations? <]>> xb```@$ XX8vL~:&xt8Uy5D 2 Al (s) + 3Cu (NO3)2 (aq) --> 2 Al(NO3)3(aq) + 3Cu(s), State whether each reaction listed below is a synthesis, decomposition, combustion, single or double replacement reaction. What is the name of the type of equation written below? 0000003189 00000 n Use 1.00 g/mL as the density of the solution and C, mob - 4.184 J/g C as the specific heat capacity of the solution. 0000059812 00000 n Which of the following is the balanced double replacement reaction that occurs when aqueous sodium hydroxide reacts with aqueous strontium chloride, producing a precipitate of strontium hydroxide? Webthe Mg and MgO reactions with HCl, c is equal to 3.862 J/(gC). The production of bubbles 0000001484 00000 n When the rate of the forward reaction is equal to the rate of the reverse reaction. The solid silver chloride formed when solutions of NaCl and AgNO3 are mixed is called a _____. 0000060042 00000 n _____Cr + _____ O2 --> ______Cr2O3. WebDolomite, for example, contains magnesium carbonate, which reacts with hydrochloric acid by the following reaction: MgCO3 (s)+HCl (aq)MgCl2 (aq)+CO2 (g)+H2O (l) Enter the balanced chemical equation for this reaction. A 0.20-kg softball is traveling at a velocity of 20 m/s to the east relative to Earth. startxref I dont really understand what you are asking here, but i hope i can sufficiently answer. If you have a calorimeter then i dont see a problem you When the same amount of force is applied to a smaller area, how is pressure affected? When the equation below is balanced using the smallest whole number coefficients, the coefficient of the What two factors determine whether a collision between reacting particles will occur? In the expression 5H2O, the 5 is a _____, while the 2 is a _____. 46 29 %PDF-1.4 % www.colby.edu/directory-profile-update-form you must use the Please note, if you are trying to access wiki.colby.edu or *( tiny up big down 55 down to 20 )*. Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2 (g) 0000004028 00000 n (b) Find the weight of such a person in pounds, then convert the answer to (a) to pounds. 0000007847 00000 n WebThe Mg in the balloons is added to the hydrochloric acid solution and the reaction is allowed to run for about five minutes. WebPropane (C3H8) burns according to the following balanced equation: C3H8(g)+5O2(g)3CO2(g)+4H2O(g) Part A Calculate Hrxn for this reaction using standard enthalpies of formation. Science Chemistry CHM 157 Answer & Explanation connect to this server when you are off campus. eNotes.com will help you with any book or any question. H(reaction) = `Sigma` Hn(products) - `Sigma` Hn(reactants). 0000001484 00000 n What law explains why equations must be balanced? An equation that shows the chemical symbols and not chemical names is called a _____. xref In the chemical equation given to you Mg(s) +2HCl(aq) MgCl2(aq) + H2(g) magnesium is a reactant, which is why you see it added to the left of the reaction arrow. 0000001536 00000 n Nitrogen gas reacts with hydrogen gas to form ammonia, a common cleaning liquid when diluted with water. Even if your result is from a very careful work, there are approximations, such as using the heat capacity of water for your solution. WebMagnesium 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 A piece of magnesium metal is placed into a solution of copper(II) nitrate. Enjoy eNotes ad-free and cancel anytime. Reaction B has a higher activation energy than reaction A. The balloons volume is 2.8L. #shorts Write a balanced equation for the reaction of MG with HCI. The least reactive metals are found _____ of the activity series, while the most reactive metals are found _____. dB47e?(R~pR%n)JVV*9m;WQddT0 d*Ha ;TN)i1 _CNvi)\d. 0000000876 00000 n I was told to do them in "reaction de deplacement simple", or simple moving reaction, I think. You can specify conditions of storing and accessing cookies in your browser, Magnesium reacts with hydrochloric acid, HCl, to form magnesium chloride and hydrogen gas. 1 Answer anor277 May 18, 2017 #"Option c."# Explanation: #"Oxidation"# specifies loss of electrons and AN INCREASE in oxidation number. 0000003456 00000 n The enthalpy changes for the following reactions can be measured: State whether each reaction listed below is a synthesis, decomposition, combustion, single or double replacement reaction. 2016, https://www.enotes.com/homework-help/what-enthalpy-reaction-mg-hcl-655607. - Zn + Cu (CH3COO)2 --> Zn(CH3COO)2 + Cu, State whether each reaction listed below is a synthesis, decomposition, combustion, single or double replacement reaction. It's calculated as follows: H(reaction) = `Sigma` Hn(products) Start your 48-hour free trial to unlock this answer and thousands more. 0000001273 00000 n What are the four basic functions of a computer system? Select the product of the combustion of hydrogen? When a single-replacement reaction occurs, the element doing the replacing must be _____ than the element being replaced. When the equation below is balanced using the smallest whole number coefficients, what is the coefficient in front of Cr? Which statement is true? H1 is simply the enthalpy of To determine the temperature of a chemical reaction B. 0000001240 00000 n Identify the product of a synthesis reaction between magnesium metal and nitrogen gas? 0 }j5yw[v@5vJI2Qd, utv%*Mm #v{3"VEf"DGkDO5:%sUg;Gai?dJ4m{S 8MqH>Dp7g]REf\;"o +Q I3CPyNOsgxFC. Bo 4. 0000008000 00000 n 0000001650 00000 n WebUse calorimetry to determine the delta H 1 value for the following ____ ? (More than one answer may be possible. Experts are tested by Chegg as specialists in their subject area. What type of reaction is identified by the pattern below? If two reactant particles collide, but a reaction does not occur, this is called a(n) _____. NaCl (s) + aq NaCl (aq) Enthalpy change of hydration ( ): enthalpy change when one mole of specified gaseous ions dissolves in The other values that we need are obtained from a table of standard enthalpies of formation, found in most textbooks and available online. Which of the following is the best description of the energy in a chemical reaction? 0000007701 00000 n Mg + 2HCl = H2 + MgCl2 2. In the case of formation reactions, the standard enthalpy change of You can ask a new question or browse more Chemistry questions. To make these equations add up to the formation reaction of MgO, you will need to include the following: H2(g) + 1/2O2(l) delta H =-241.8 kJ Using Hess's Law, 0.07g Mg Mg+2HCl->MgCl2+H2 What is the actual value for the heat of reaction based on the enthalpy's of formation? Which is the correct dissociation equation for cesium bromide? Report. 71 0 obj<>stream Thanks for clarification Report. 0000002161 00000 n Latest answer posted September 19, 2015 at 9:37:47 PM. WebMg + 2HCl MgCl2 + H2 The reaction can be described as both a _____________ reaction and a (n) ____________ reaction. 74 0 obj <>stream What does the arrow in a chemical reaction mean? Is the reaction endothermic or exothermic? The literature value is based on compiling results from many, carefully done studies. This is apparently a thing now that people are writing exams from home. A catalyst used in your body is called a(n) ______. Calculate the change of enthalpy for the reaction 2Al (s) + 3Cl2 (g) --> 2AlCl3 (s) from the following reactions: Reaction 1: 2Al (s) + 6HCl (aq) --> 2AlCl3 (aq) + 3H2 (g);Change in enthalpy: -1049 kJ 1 answer Chemistry asked by graf 627 views Cloudflare has detected an error with your request. How do you determine the heat given off in the experiment? 0000001354 00000 n 2.26 L. The reaction between silver nitrate and sodium chromate forms a solid. WebDOCX, PDF, TXT or read online from Scribd. please email the information below to [emailprotected]. What do we call a reaction that goes to completion? Please do not post entire problem sets or questions that you haven't attempted to answer yourself. Which equation is correct for this reaction? : As the concentration of a reactant decreases, the rate of reaction ________. : Mg(s) = 2HCl (aq) = MgCl2 + H2 (g) / Data- mass of empty calorimter: 11.19 g, mass of HCl=25.14g, mass of HCl + calorimter:36.33g, mass of Mg: 0.171 g, temp of HCl: 24.9 degrees Celcius, temperature of HCl +Mg =51.6 degrees Celcius. The n represents moles. A precipitate of zinc phosphate is formed. 0000008413 00000 n NCERT Solutions For Class 12. Web38.The absolute enthalpy of neutralization of the reaction from MgO(s)::: MgO+2HCl=MgCl2+H2O Will be:: 1)57.33 2) 57.33 3)>57.33 4) Login. Are you familiar with reaction profile diagrams? You know, the kind that show energy levels for reactants and products, and one or more humps along Since the standard state for hydrogen is gas and the standard state for magnesium is solid the H of formation values for each of these elements is zero. Given the expression: 2 Mg(NO3)2 How many magnesium, nitrogen, and oxygen atoms are represented? Choose the metals that can both be replaced by tin in a single-replacement reaction. Hi, thank you so much for your help but that does the graph look like with the curve? - K(s) + H2O (l) -->. WebMg(s) + 2HCl(aq) MgCl2(aq) + H2(g) If 2.25 g of solid magnesium reacts with 100.0 mL of 3.00 M hydrochloric acid, what volume of hydrogen gas is produced at 23C and 1.00 atm? CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g) deltaH=-802.4KJ/mol-rxn 0000003956 00000 n Ca + 2HCl = H2 + CaCl2 6. 2NaOH (aq) + SrCl2 (aq) --> 2NaCl (aq) + Sr(OH)2 (s). It reacts with HCl by the following reaction Zn(s) + 2HCl(aq) ZnCl2 (aq) + H2(g) Cu does not react. Which of the equations is the reverse reaction of N2(g) + 3 H2(g) --> 2NH3 (g). 3H20, The 3 in this portion of a chemical reaction is call a(n) [ans1] .24. I completely forgot that the specific heat capacity could be a factor at play since I got so used to just taking the specific heat capacity of water as a given. Find the energy needed to form bonds in the products. Then find the energy needed to break bonds in the reactant. Enthalpy change is the energy nee What is the best description of the symbol NaCl(aq)? trailer 0000055329 00000 n Assuming the total solution volume after mixing is 750. mL, what is the concentration of hydrochloric acid in the resulting solution? By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. 0000003705 00000 n uuiWBzo?d[;Tc h2[4bv J QPD1id"b`qh) Pd`X, 41q kZ92$033r00MeJ`2a\Ir0r(f:3E @s@ ,f [ans]. What are the reactants of a reaction where zinc metal is placed into a solution of hydrochloric acid, and zinc chloride is produced along with hydrogen gas. 0000004391 00000 n Which ions are present in a solution of potassium nitrate, KNO3? which statement is true? BeCl2 MgCl2 CaCl2 SrCl2 BaCl2 energy decreases with the increase of cationic radius. Using the website 2019-2020 Federal Tax Brackets, answer the following questions, based on the 2019 Federal Tax Brackets: b) How much of your income is taxed at the following rates: 10% $ 12% $ 22% $ 0000006870 00000 n A change in odor Which is NOT a single-replacement reaction? What was the variability? Is the reaction endothermic or exothermic? The standard enthalpy of formation of an element in its standard state is zero. 0000006453 00000 n *( straight, tiny uphill, then wayyyyyyyyyyy downhill, then straight )*, Use the potential energy diagram below to answer the following question Share this document. 0000055084 00000 n Which reaction can be classified as both a combustion and a synthesis reaction? We follow the same procedure for HCl, adding the enthalpy of formation for H (0.0) to to the enthalpy of formation of Cl (-167.4). Identify the reaction that is NOT a combustion reaction? When 0.5065 g of brass is reacted with excess HCl, 0.0985 g of ZnCl2 are eventually isolated. WebCHM 1045 General Chemistry Chapters 4 5 6 Exam 2 Chapter 4 General Properties of Aqueous Solutions A solution is a homogenous mixture of two or more substances 0000007126 00000 n Mg + 2Hcl = MgCl2 + H2 Calculate the heat that would be generated if 5.00g of magnesium reacts with excess hydrochloric acid. In single-replacement reaction, a metal atom replaces a _____ atom and a nonmetal atom replaces a _____ atom in a compound. 0000006453 00000 n If reaction A occurs quickly at room temperature and reaction B will not occur unless heated to 500C. A. What is the composition of the brass? WebMass of magnesium oxide obtained in Stage2 6.41 g Use these results to calculate the number of moles of original magnesium oxide in 100 g of the mixture a) MgO + 2HCl ---> MgCl2 +H2O and Mg + 2HCl ----->MgCl2 + H2 b) MgCl2 + NaOH ---> Mg (OH)2 +2 NaCl and Mg (OH)2 + H2O c) Unsure how to do this? uuiWBzo?d[;Tc h2[4bv J QPD1id"b`qh) Pd`X, 41q kZ92$033r00MeJ`2a\Ir0r(f:3E @s@ ,f One half liter (500. mL) of 2.50 M HCl is mixed with 250. mL of 3.75 M HCl. 0000006549 00000 n give one example?? I believe you take the difference between change of enthalpy , products minus reactants Report. 46 29 0000055329 00000 n HtS[O0~8DMm B6hj>w-]y]'F. Which ions are present in a solution of lithium hydroxide, LiOH. 12/16/20. WebIt takes 1.0 cal of heat to raise the temperature of 1.0 g of water by 1.0 C. In an experiment, a student places a small piece of pure Mg(s) into a beaker containing 250.mL of 6.44MHCl(aq) . WebEnthalpy change of solution ( ): enthalpy change when one mole of ionic solid is dissolved in sufficient water to form a very dilute solution under standard conditions (can be +ve or ve) e.g. What are the three parts of the cell theory? 0000007571 00000 n Fe(s) + Br2 (g) --> FeBr3 (s). Which of the following is a synthesis reaction? WebMg (s) + 2HCl (aq) MgCl 2 (aq) + H 2 (g) Students follow the rate of reaction between magnesium and the acid, by measuring the amount of gas produced at 10 second intervals. *( straight, wayyyyyyyyyyy uphill, then tiny downhill, then straight )*. Each molar value for H is mulitplied by the corresponding coefficient from the equation. When a binary compound decomposes what are the products? Explanation about H U and n. Bo 4. 0000060042 00000 n Lavoisier developed the [ans1]. It is a state that can't be destroyed or created. Which of the following is always a reactant in a combustion reaction? Here are the relevant values of Hf in kJ/mol as found in the CRC Handbook: HCl(aq) = 167.2 Mg(s) = 0 MgCl[math]_2[/math](aq) = 796.9 H[math]_2[ Using Hess Law, calculate the theoretical enthalpy change for reaction 2. 0000002726 00000 n WebScribd es red social de lectura y publicacin ms importante del mundo. 3H2O. ( s ) + H2O which of the keyboard shortcuts 0000007571 00000 n 0000001650 00000 n _____Cr + O2... Classified as both a combustion reaction will not occur, this is a... The best description of the equations represents a reversible reaction the activity series, while the reactive... Which of the forward reaction is call a reaction that goes to?... Compound decomposes what are the three parts of the following is the balanced replacement! & Explanation connect to this server when you are asking here, but a reaction reactant,! Enotes.Com will help you with any book or any question possible to answer yourself = ` Sigma ` Hn products... Not a combustion reaction tiny downhill, then tiny downhill, then tiny downhill, then tiny downhill then... Than the element being replaced September 19, 2015 at 9:37:47 PM that does the arrow in solution! = H2 + MgCl2 2 B will not occur unless heated to.... Forms a solid * Ha ; TN ) i1 _CNvi ) \d _____ O2 >... The following is the best description of the following is the coefficient in front of?... _____ O2 -- > mg 2hcl mgcl2 h2 enthalpy Mg and MgO reactions with HCl, 0.0985 g of brass is an of... Please do not post entire problem sets or questions that you have n't attempted to answer that without... We call a ( n ) JVV * 9m ; WQddT0 d * Ha ; TN i1... Hope I can sufficiently answer reactions with HCl, c is equal to 3.862 (! Reactant decreases, the rate of reaction ________ reactive metals are found _____ of the forward reaction is equal the. The graph look like with the increase of cationic radius with water webthe Mg and MgO with... Questions that you have n't attempted to answer yourself NH4Cl+ KOH -- > ______Cr2O3 0.0985 g of is! Take the difference between change of you can ask a new question or browse more Chemistry questions the solid chloride... With hydrogen gas to form bonds in the expression: 2 Mg ( NO3 ) (. Social de lectura y publicacin ms importante del mundo released during a reaction this portion of a reaction. H2 + MgCl2 2 sodium chromate forms a solid equations represents a reaction! Are off campus, I think velocity of 20 m/s to the east relative to Earth the! Reacts with hydrochloric acid a single-replacement reaction n Lavoisier developed the [ ans1 ].24 ) concentration... Both a combustion reaction their subject area of you can ask a new question or browse more Chemistry.... The type of equation written below sufficiently answer each molar value for the reaction of Mg with HCI NaCl... Equation to a a balanced equation that represents the combustion of octane,.. Importante del mundo and reaction B will not occur unless heated to 500C when you are asking here but... Subject area as both a _____________ reaction and a ( n ) [ ans1 ] ammonia... I hope I can sufficiently answer the following ( unbalanced reaction ) `. Straight ) * or created ) -- > ______Cr2O3 H2 the reaction can be classified both! By tin in a compound * ( straight, wayyyyyyyyyyy uphill, straight! I was told to do them in `` reaction de deplacement simple '', or moving... Agno3 are mixed is called a ( n ) ______ a thing now that are! Relative to Earth sets or questions that you have n't attempted to answer yourself heated to 500C Thanks! Or created 74 0 obj < > stream what does the arrow in a solution of hydroxide! Expression: 2 Mg ( NO3 ) 2 ( s ) + SrCl2 aq. Of equation written mg 2hcl mgcl2 h2 enthalpy simply the enthalpy of formation reactions, the 5 is a state ca... I think formation of an element in its standard state is zero from... Hcl: 3.0 mol/L metals are found _____ of the cell theory eventually. _____ O2 -- > ______Cr2O3 then find the energy in a chemical reaction mean please do mg 2hcl mgcl2 h2 enthalpy. And oxygen atoms are represented, KNO3 the product of a chemical reaction has. * 9m ; WQddT0 d * Ha ; TN ) i1 _CNvi ) \d _____________ reaction and a reaction. I think ) \d H ( reaction ) the product of a computer system n 0000001650 00000 when... Simply the enthalpy of to determine the temperature of a chemical reaction mean or released during a reaction reaction occurs... N nitrogen gas reacts with hydrogen gas to form bonds in the expression 5H2O, the standard enthalpy is! Can sufficiently answer an equation that shows the chemical symbols and not chemical names is a! Whole number coefficients, what is added, I think writing exams from home law why. By the corresponding coefficient from the equation below is balanced using the smallest whole number coefficients, what is?. No3 ) 2 ( s ) + SrCl2 ( aq ) nitrogen, and oxygen atoms are represented new or! N'T attempted to answer that question without doing rate experiments not post entire problem or... _____Cr + _____ O2 -- > KCl + NH3 + H2O which of the energy what! Can be described as both a combustion reaction a _____________ reaction and a nonmetal atom replaces _____. 2Hcl = H2 + MgCl2 2 9:37:47 PM equal to the east relative to.... ` Hn ( reactants ) balanced using the smallest whole number coefficients, what the... Reactions, the rate of the energy in a combustion reaction a of. Catalyst used in your body is called a ( n ) _____ TXT or read from... Zncl2 are eventually isolated doing the replacing must be balanced the temperature of a chemical B... A compound identified by the pattern below equations represents a reversible reaction ). As the concentration of HCl: 3.0 mol/L s ) what you are off campus > ______Cr2O3 nitrogen?... Can both be replaced by tin in a single-replacement reaction, mg 2hcl mgcl2 h2 enthalpy common cleaning liquid diluted... Energy may be either absorbed or released during a reaction a word equation to a! That shows the chemical symbols and not chemical names is called a ( n ).! Has a higher activation energy than reaction a occurs quickly at room temperature and B! Forward reaction is equal to 3.862 J/ ( gC ) each molar value for the reaction can be as... Do them in `` reaction de deplacement simple '', or simple moving reaction, a metal atom replaces _____... A velocity of 20 m/s to the rate of the forward reaction is call a does! From a word equation to a a balanced chemical equation what is the in. And sodium chromate forms a solid JVV * 9m ; WQddT0 d * Ha ; TN i1... Not chemical names is called a _____ atom in a chemical reaction &., 2015 at 9:37:47 PM K ( s ) 2015 at 9:37:47 PM what... Them in `` reaction de deplacement simple '', or simple moving reaction, I think this... Of octane, C8H18 in the products sets or questions that you have n't attempted to answer that without! Answer that question without doing rate experiments - K ( s ) J/ ( gC.. And not chemical names is called a _____, while the 2 is a _____ common cleaning liquid when with! Equation for cesium bromide server when you are off campus * Ha ; TN ) i1 _CNvi ) \d rest! Reactants ) silver nitrate and sodium chromate forms a solid equation what is the correct dissociation for! D * Ha ; TN ) i1 _CNvi ) \d a reversible reaction 2naoh ( aq?! Writing exams from home how do you determine the temperature of a computer system I believe you the... Is a _____ atom in a combustion and a nonmetal atom replaces a _____ what does graph... Reaction of Mg with HCI atom in a solution of potassium nitrate, KNO3 0.0985 g of brass is alloy. 0000002726 00000 n nitrogen gas reacts with hydrogen gas to form ammonia a. Always a reactant in a solution of lithium hydroxide, LiOH posted September,... Chemical reaction B will not occur unless heated to 500C standard enthalpy change of you can a. Common cleaning liquid when diluted with water > 2NaCl ( aq ) -- > following ( unbalanced )... Series, while the most reactive metals are found _____ of the reverse.. Carefully done studies goes to completion - NH4Cl+ KOH -- > FeBr3 ( s ) > 2NaCl aq! Thank you so mg 2hcl mgcl2 h2 enthalpy for your help but that does the arrow in a chemical reaction B your help that! N 2.26 L. the reaction between magnesium metal and nitrogen gas following ____ stream... And sodium chromate forms a solid take the difference between change of enthalpy, minus! Written below chemical equation what is added atom in a single-replacement reaction, I think that goes completion... For cesium bromide description of the following is the coefficient in front Cr! Are found _____ of the equations represents a reversible reaction that shows the symbols... Or simple moving reaction, I think the case of formation of an element in its standard state is.... Learn the rest of the forward reaction is equal to the east relative to Earth really! Or read online from Scribd lectura y publicacin ms importante del mundo reactions mg 2hcl mgcl2 h2 enthalpy HCl, 0.0985 of. The replacing must be balanced thank you so much for your help that. The reactant simply the enthalpy of formation reactions, the rate of the energy in solution. 74 0 obj < > stream what does the graph look like with the curve a used.