Reaction Definition and 1000 Threads

In lab I am doing a series of single replacement reactions and I am curious how to calculate the heat of reaction for single replacement reactions and what measurements to take so I can calculate it?

I have to say if each reactant is first, second or zeroth order. Now, I know that usually, we have plots of ln([]) over time. But my teacher wants to trick me. Here is how I do this: Take two data points: convert them to [ ] and normal rate (remove the ln() function). Compare the two...

Homework Statement Calculate the pH of a solution containing 5.0 g of NaHCo_3 (molar mass = 84.0 g) in 250. mL of H20. NaHCO_3 is amphiprotic. k_a= 4.7x10^{-11}, k_b=2.3x10^{-8} This is for a General Chemistry II class, for the record. The Attempt at a Solution I started...

Homework Statement How many milliliters of Cl2 gas, measured at 28.0 °C and 750 torr, are needed to react with 18.5 mL of 0.173 M NaI if the I- is oxidized to IO3- and the Cl2 is reduced to Cl-? Homework Equations The Attempt at a Solution So the molar mass is .0030906 mol NaI...

Homework Statement Give all possible products of the following reaction. How many stereoisomers of each product could be obained Homework Equations See attached image The Attempt at a Solution For product 1, there is 1 chiral centre and 1 double bond. ∴No. of products = 22 For 2, it...

Homework Statement All the substances involved in the reaction given below can undergo combustion reaction and their combustion enthalpies at 300K are given below, 2A(g)+B(g) ----> 3C(g) + D(g) Given: ΔH A = -1000cal/mol ΔH B= -2000cal/mol ΔH C=-500 cal/mol ΔH D = -100 cal/mol If the...

Homework Statement http://i.minus.com/jfUXIXvQJw8hw.png Homework Equations Ka of hydrogen sulfate ion will be taken as 1.2x10-2. Ka of ammonium ion will be taken as 5.6x10-10 Kb of ammonia will be taken as 1.8x10-5 Kb of sulfate ion will be taken as something very tiny (Kw/Ka of...

[b]1. Hi, The problem: A roof support frame has various leadings on it. The frictionless pin joint at points A has vertical and horizontal reaction forces. The rollers at point B allow free movement in the horizontal direction and has a vertical reaction. a/Calculate The total Horizontal...

I was not expecting there to be a reaction between aluminum metal and a solution of iron chloride. I thought the aluminum would be oxidized and the iron reduced. What is the reaction that is occurring that is creating hydrogen gas on the surface of the aluminum? I know it has to do with...

http://imgur.com/cIprKmy To re explain here, I know that (1) is correct as the X is electron rich while the carbon is electron poor so the reaction is correct. But for (2) I'm not entirely sure if it is correct. if we just consider the electronegativity of X and N Then as drawn N should...

I have seen modern steam turbines with velocity compounding, they start with impulse stage then reaction stages,can anyone tell me, why There is a impulse stage first,why not a reaction stage first?

Homework Statement The shaft carries two particles of mass m, and rotates about the z-axis with the constant angular velocity ##\omega##. Determine the x- and y-component of the bearing due to imbalance. The Attempt at a Solution Rotation only around the ##z-##axis so ##\omega _{x}=\omega...

I am reading a chemistry book printed in 1805. The chemical reaction equations are written using the equality symbol = instead of the arrow →, which is used in modern times. Anyway sometimes it is still possible to see the "old fashioned" way...

Assume that the arbitrary-shape object shown has a torque applied at the black X with a circle, and is free to rotate about the X axis. Assume that the object is also constrained by a pin at this torque input point, parallel to the X-axis. The CG of the object is the blue plus sign, and there...

Homework Statement ##_{1}^{2}\textrm{D}+_{1}^{3}\textrm{T}\rightarrow _{4}^{2}\textrm{He}+n## How much energy releases? Homework Equations Semi empirical mass formula that we use: ##W=-w_0A+w_1A^{2/3}+w_2\frac{Z(Z-1)}{A^{1/3}}+w_3\frac{(a-2Z)^2}{A}+w_4\frac{\delta...

Hi, this may seem like a noob question for you geeks out there, but I can't wrap my head around this. The formula for a spontaneous reaction is \DeltaH-T\DeltaS < 0 Basically, since the reaction between hydrogen and oxygen gas has a negative change in enthalpy it must mean that if the...

Homework Statement The reaction v1A+v2B--->Products is 1st order wrt A and 0 order wrt B.If the reaction is started with [A0] and [B0] find the integral rate equation. The Attempt at a Solution I have got ln[A0]/[A0]-v1x=kt but answer is given as ln[A0]/[A0]-v1x=v1kt.Which one is right?

Homework Statement Lets say you have 1 liter of 2 mol/L methane and the same amount of chlorine. Let's also say that both are liquids since those are most likely to react. Now the only way they can both be liquids is if the temperature is as cold as an antarctic winter so this is not aqueous...

Homework Statement Rod AB is attached to a collar at A and rests against a roller at C. a = 107mm, l = 642mm, P = 110kN and Q = 30kN, determine: The reaction at A (by the vertical rod) (Unit: kN) The magnitude of the reaction at C (Unit: kN) Homework Equations This is my first...

Just a curious question. How would the rate for a net reaction involving multiple steps of all similar (perhaps exact - i know it's highly unlikely) activation energies be calculated? I've been told to just look at the slowest step (highest EA) in all cases, even if they are similar in...

We were just going over examples of reaction orders in class and I was told 2 things: 1.) Negative reaction orders are possible 2.) An order of 0 says the reaction rate is independent of the reactant concentration(s) I had a few questions, though. 1.) What exactly constitutes a...

Hello. My teacher and I have had this very intense debate for quite some time now and we need your opinion on this issue. This question is, where does the energy released in a nuclear fission reaction come from? (Please use the terms "nuclear binding energy" and "mass defect") My take on this...

Suppose in the reaction 2 NO + O2 --------> 2NO2 Why when the the concentration of NO is doubled, the rate increases 4 times, I know that the rate is directly proportional to the square of NO concentration (I don't know why) and it's order of reaction is 2 ( I don't why ). but I still can't...

N2 + 3H2 -----> 2NH3, For this reaction to occur does one nitrogen have to collide with 3 hydrogen molecules, or should 3 nitrogen molecules collide with 3 hydrogen molecules to break up the bonds? I just brought up this example because of it's stoichiometry not for any other reason. Thanks in...

Homework Statement I am given the following chemical eqn TiCl4(g) + O2 → TiO2 (s) + 2Cl2 I am also given some values on the heat of formation and the entropy of the substances but however only at 300Kelvin and i am given some values and the formula to calculate Cp of the substances The...

Homework Statement My problem is with a portion of a much larger problem, I'm working on an exercise involving the production of synthesis gas in where there's a reactor in which it is postulated that the following reactions take place: CH4 + CO2 ⇔ 2CO + 2H2 CO + H2O ⇔ CO2 + H2 CH4 + H2O ⇔ CO...

X + Y + Z -> A + C+ + B- Initial Concentrations Z= 4.1 X 10^-3M, X=2.3 X 10^-1M, Y= 1.2 X 10^-1 M. http://s121.photobucket.com/user/marykaywest420/media/81386cf6-e132-4578-8fb5-1024a2a3f3d5_zpscc804723.jpg.html?sort=3&o=0 3. So my attempt included graphing -R/(R∞-R) vs. time. which produced...

Hi I am tutoring a pupil in high-school out of necessity (no other teachers avail), while I am not so acquainted anymore with chemistry. The pupil showed me a question concerning the calculation of the reaction enthalpy which looked somewhat as follows: 1. Problem statement, all variables...

Homework Statement To activate the reaction ##(n,\alpha)## with stationary ##B^{11}## nuclei, neutrons must have the activation kinetic energy ##T_{th}=4\,MeV##. ##(n,\alpha)## means that ##n## is bombarded to obtain ##\alpha##. Find the energy of this reaction. (Ans: ##Q=-11/12 T_{th}##)...

Homework Statement Investigate The number of atoms splitting up in a nuclear reaction and Bacterial growth Your investigation should use appropriate formulae and graphs and include information from records of real events. You should aim to show how good the mathematical models are in...

Hi, thanks for checking out this thread. I'm really having a problem with the question because I don't have any foundation. If you could, would you: Explain what exactly is going on? Is this an endothermic or exothermic reaction? What are colligative properties, and what do they have to...

Homework Statement Rxn: 2SO2 (g) + O2 (g) \Leftrightarrow 2SO3 (g) If the initial concentration of SO3 is .500 M (moles/liter) @1500K, what are the final concentrations of [SO2], [O2] and [SO3]. Kc = .15 Stop when you get to the cubic equation Homework Equations RICE table...

2BH3(g)->B2H6(g) Which is true? a)The reaction is always non spontaneous. b) The reaction is always spontaneous. c) The reaction is sometimes spontaneous and sometimes not. d)The reaction is endothermic. e) two of the statements are right. I know that deltaSsystem is negative. (Less...

The equation is balanced, but would it actually work? NaOCH3 + CO2 + H2O → NaHCO3 + CH4O Or would the reaction simply ignore the water in the left hand side and go, 2NaOCH3 + CO2 → Na2CO3 + H2O + C2H4 Or perhaps a little of both? I'm just starting to teach myself Chemistry, so any insight...

Hello, I am confused about the following scenario. Suppose I have the reaction CO (g) + 2H2 (g) → CH3OH (g) and I am asked to solve for the heat of reaction at 800 C. My query is the following: when finding the heat of reaction at standard state, which heat of formation I should use...

Okay let's say we have water, sodium hydroxide and hydrogen chloride. What do you think is going to happen? Do you think the pH will be the same, a little higher, or a little lower? You have this reaction down here: H2O+NaOH+HCl(assuming they are equal)= H2O+OH-+Na+(positive...

Homework Statement Determine the enthalpy of this reaction (below). 2NO_{2} \rightarrow N_{2}O_{4} Homework Equations Reaction is exothermic if product is more stable than reactants. Reaction is endothermic if the reverse were true (product less stable than reactants). The Attempt at a...

does fusion nuclear reaction produce alpha and jamma ridation or just alpha

Homework Statement If you are worried about safely driving after a party, I recommend you just not drive! But if you want to see when you are finally okay to drive, here is a test to see if you are still too “impaired”. Take a dollar bill and have a friend hold the bill from one of the short...

Homework Statement Good day! I have a question from my chem HW that is stumping me. Although the answer may be simple, it has eluded me for quite a bit. It regards rate laws and constants of reactions. Question is as stated: This reaction was monitored as a function of time: AB --> A + B A...

Homework Statement Which of the following CAN be made as a pure substance? Choices are a list of molecular salts. Homework Equations According to my teacher the salt cannot be made as a pure substance if the components undergo a large extent acid-base reaction. The correct choice was...

Hello! What would be the substance, chemical reaction and technique, to have the highest rate of immediate mass change, back and forth, from low to high and back to low again, as many times as needed - using only homemade DIY, non dangerous materials and equipment? My intentions are to...

Homework Statement This is not a homework question, rather, I am just trying to clarify a concept and example in my textbook. Ammonia is produced by the reaction of Nitrogen (N2) with hydrogen (H2) as shown in this equation. N2 + 3 H2 --> 2 NH3 The rate of ammonia production is 5.0 x 10-6...

This question relates to rate constants of transition events. The transmission coefficient κ reduces the value of the rate constant compared to the transition state theory (TST) value. I understand κ to be defined as the probability that a reaction coordinate q will proceed to product given that...

I'm wondering what happens in a single displacement reaction if the displacing metal (the one that's going into the solution) reaches it's solubility limit before the other metal in the solution is fully displaced. Say for example you had a strong silver nitrate solution, and you placed enough...

1) Is armature reaction seen in all machines ie DC, INDUCTION & SYNCHRONOUS machines ? (just answer briefly, which all machines exhibit it) 2) Is back emf in DC motor nothing but LENZ'S law, or is the generating action in DC motor called the LENZ's law, or are both same, and I'm confused ...

suppose you have 2 litres of pure hcl in a solution of 4 litres of radioactive h2o , so the concentration of HCl is 1/3 of the whole solution , now suppose you neutralized that solution with Sodium hydroxide , what happens to the radioactive solvent ? is it involved in the reaction ? does its...

what types of chemical reaction does not have oxdiztion and reduction...

Hi, I need help determining which of the statements are true and false. http://imgur.com/9BC1Wqf I know this involves steady state approximation, but I find that when I try it I am never able to rid of all the intermediates. Please help Thanks

Homework Statement Nitrous oxide reacts with ozone to form dinitrogen pentoxide. There are four moles of each reactant and the volume of the container in which this reaction takes place is 2 L. T is constant. The equilibrium constant for this reaction is 1. How many moles of product are...