a certain reaction has the following generaln form

73,091 results, page 66

Math

A chemist needs 22 liters of a 14% acid solution. He has a 10​% solution and a 20% solution available to form the mixture. How much of each should be used to form the 14​% ​solution? I'm having a really hard time forming an equation for this. I've tried ...

Further Maths

uniform ladder of length 5m and weight 80 newtons stands on rough level ground and rests in equilibrium against a smooth horizontal rail which is fixed 4m vertically above the ground. If the inclination of the ladder to the vertical is x, where tan x is less than 3/4, find ...

Chemistry

At 900 K the following reaction has Kp=0.345; 2 SO2(g) + O2 (g) -> 2 SO3 (g) In an equilibrium mixture the partial pressures of SO2 and O2 are 0.145 atm and 0.455 atm, respectively. What is the equilibrium partial pressure of SO3 in the mixture?

chemisty

Consider the following unbalanced equation between copper(I) ions and iron to produce copper metal and iron(II) ions: Cu+ + Fe → Cu + Fe2+ What is oxidized in this reaction? A) copper(I) ion B) iron C) copper D) iron(II) ion

chemistry

17. Calculate H for the following reaction using Hess law H2 (g) + Br2 (g) → 2 HBr (g) Experimental information 2 H+ → H2 H -436.4 kJ 2 Br- → Br2 H -192.5 kJ 2 H+ + 2 Br- →2 HBr H -144.8 kJ

Chemistry

The iodide ion can be oxidized in an acidic solution by hydrogen peroxide. One proposed mechanism for the reaction is as follows: Step 1: H2O2 (aq) + I-(aq) → H2O (l) + OI-(aq) slow Step 2: H+(aq) + OI-(aq) → HOI(aq) fast Step 3: HOI (aq) + H+(aq) + I-(aq) → ...

chemistry

a reaction known to release 1.78 kilojoule of heat takes place in a calorimeter containing 0.100L of soln. the temperature rose by 3.65C. next, a small peice of caco3 was placed in same calorimeter and 0.100L of dilute Hcl was poured over it. the temperature of the calorimeter...

Chem Lab Math!

A liquid solution of formaldehyde is 37.0% pure. This solution has a specific gravity of 1.037. The molecular weight of formaldehyde is 30.0. to 1.00 ml of this impure stock solution is added quantity sufficient to take the total volume to 500ml. If 1.00 ml of this solution is...

Chemistry

24) It was found that a 20.00 mL portion of a solution of oxalic acid, H2C2O4, requires 6.69 mL of 0.200 M K2Cr2O7 for complete reaction in an acidic solution. In the reaction, the oxidation product is CO2 and the reduction product is Cr3+. How many milliliters of 0.450 M NaOH...

chemistry

Oh my my test is coming up and I have no idea how to do these questions and when I asked my teacher for help he said you should do it yourself.... Thanks! An intermediate step in the production of battery acid, sulfuric acid, invoves the information of sulfur trioxide gas from...

Chemistry

Calculate the percent yield of iron if 950 g of Fe3O4 underwent the reaction shown in the chemical equation below and 533 g of Fe was isolated from the reaction mixture. Fe3O4 (s) + 2 C(s) ----> 2 CO2 (g) + 3 Fe(s) 1). 25.9% 2). 77.5% 3). 56.1% 4). None of the above. Based ...

Chemistry-Dr. Bob

Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), calculate: a) the PV work...

chem hwk

a simple hwk question.. i don't understand what i need to do.. 1-butanol (shown below) burns in the presence of oxygen to give off carbon dioxide and water by the following reaction: C4H9OH + 6 O2 ==> 4 CO2 + 5 H2O If 40.88 mL of 1-butanol burns completely, how many grams ...

College Algebra

These are the points on the graph! O year = $41000 1 year = $43000 2 year = $46000 3 year = $48500 The following graph shows Bob’s salary from the year 2002 to the year 2005. He was hired in the year 2002; therefore t = 0 represents the year 2002. List the coordinates of any...

Chemistry --really need help!

I am really struggling with these problems!! A reaction mixture that consisted of 0.20 mol N2 and 0.20 mol H2 was introduced into a 25.0 L reactor and heated. At equilibrium, 5.0% of the nitrogen gas has reacted. What is the value of the equilibrium constant Kc for the ...

Chemistry*

Oh sorry I forgot the arrows! Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid-fuel rocket motors. The reaction is given below. Fe2O3(s) + 2 Al(s) -->2 Fe(l) + Al2O3(s) What masses of iron(III) oxide ...

Chemistry II

The value of ^G for the following reaction is -5490 kJ. Use this value and data to calculate the standard free energy of formation for C4H10 (g). 2 C4H10 (g) + 13 O2 (g) --> 8 CO2 (g) + 10 H2o (l) Do you know the heats of formation for CO2 and H2O? Wouldn't delta G/2, minus...

Chemistry

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4Cr(s)+3O2(g)→2Cr2O3(s) 1.) 1 molCr; 1 molO2 2.) 4 molCr; 2.5 molO2 3.) 12 molCr; 10 molO2 4.) 14.8 molCr; 10.3 molO2 Express your answer as a chemical formula. I'm...

rate of reaction

What is the initial rate of *appearance* of SO3(g)? a reaction and table are given: reaction: 2S02(g)+O2 -------> 2 SO3(g) Table note: i= initial, IRD= initial rate of disappearance; concentrations given in molarity (M) IRD given in M/s. Experiment [SO2]i [O2]i IRD O2 1 0....

Science-Chemistry

Analysis questions: A) What evidence is there that the gas bubbles formed in the first part of the investigation were hydrogen gas? Answer: Evidence there was that proved that the gas bubbles formed in the first part of the investigation were hydrogen gas is that there was ...

Science-Chemistry

Analysis questions: A) What evidence is there that the gas bubbles formed in the first part of the investigation were hydrogen gas? Answer: Evidence there was that proved that the gas bubbles formed in the first part of the investigation were hydrogen gas is that there was ...

Chemistry

1. If you became confused and did not know whether a flask contains an aqueous layer or an organic layer, how would you find out which it is? 2. Write a balanced reaction for the reaction of Aspirin is precipitated from the basic aqueous solution by the addition of HCl. 3. ...

physics

which of the following MUST necessarily happen if work is done: a. energy must be released b. energy must be used c. energy must be converted from one form to another d. it is not necessary that any of these Must happen

math

I'm sorry I was unable to open your answer. My question was if you could tell me if the following is correct in standard form 1. fifty-four million, six and six hundredths 54,000,006.06 2. thirty-three million, five and five hundredths 33,000,005.05

physics

Two forces of equal magnitude act on the same object. Which of the following must be true? a. The object is moving. b. The object is accelerating. c. If the object is initially at rest, it cannot remain at rest. d. The two forces form a third-law pair. e. None of the above.

AP chem

A 0.345g sample of anhydrous BeC2O4, which contains an inert impurity, was dissolved in a sufficient water to produce 100ml of solution. A 20.0ml portion of the solution was titrated w/ KMnO4(aq). The balanced equation for the reaction that occurred is as follows: 16H^+(aq) + ...

Math in Science

A rock containing a newly discovered fossil is found to contain 5 mg of an unstable form of potassium and 5 mg of the stable element formed from its decay. If the half-life of the unstable form of potassium is 1.3 billion years, how old is the rock? What can you infer about ...

Chemistry

When given a chemical reaction, how would I know whether a reaction is endo or exothermic and whether work is done on the system or by the system. Without using any calculations. So I have a couple reactions which I have to use chemical reasoning to to determine. 2 Cl(g) -->...

Chemistry

1. A solution containing 0.100 mol of Na2CO3 and 0.100 mol of NiCl2 is allowed to react. Which reactant is the limiting reactant? 2. A solution containing 0.100 mol of Na2CO3 and 0.100 mol of NiCl2 is allowed to react. How many moles of precipitate form in this reaction?

chem

Ammonia reacts with oxygen to form nitrogen dioxide and water according to the following equation: 4NH3(g) + 7O2(g) ® 4NO2(g) + 6H2O(g) You react ammonia and oxygen, and at the end of the experiment you find that you produced 27.0 g of water, and have 8.52 g of ammonia left ...

English please check my answer

Please check my answer thank you Cardiology is the study of the heart. Which of the following terms describes the foundation upon which the medical word is built that usually relates to the body organ involved ? A. Prefix B. Suffix C. Root D. Combining form My answer is Root (c)

biology

Which of the following bond types is Fexofenadine capable of forming with a suitable partner molecule? Indicate your answer by checking "Yes" or "No" as appropriate. Bond type Can Fexofenadine form this bond? Hydrogen Bond Ionic Bond van der Waals forces As a whole, is the ...

English

A verb phrase that acts as a noun is called a(n) participal adverbial infinitive gerund Which of the following is a prepositional phrase in the sentence below? (Applause came from the bleachers.) Applause came came from from from the bleachers My answers: gerund from the ...

Chemistry 1 [more detailed]

thanks for the responses but i still don't understand it. I think its more detailed what i have to find now. I have to find the names and correct formula for the reactants and products for the following. "When strongly heated, magnesium and sulfide formed a yellow crystalline ...

Chemistry

Consider the following reaction. 2A(aq) (Two way arrows) B(aq) Kp = 5.48*10^-5 at 500K If a sample of A at 3.10atm is heated to 500K, what is the pressure of B at equilibrium? I know I need to do the ICE table, but am having trouble solving for x once I plug everything in. "A...

chemistry

Consider the following chemical equilibrium: SO3(g) --> SO2(g) + 1/2 O2(g) and Delta H = 98.9J a. Predict weather the forward or reverse reaction will occur when the equilibrium is disturbed by: i. adding oxygen gas ii. compressing the system at constant temperature iii. ...

Chemistry

Would the percent yield of Ni(NH3)nCl2 be high, lower, or unchanged if you made the following procedural changes? a) You performed the synthesis reaction at 100 degrees instead of 60 degrees b) you dissolved the NiCl2*6H2O in 50 mL of distilled water instead of 10mL c) You did...

chemistry

For each of the following chemical reactions: a.)classify the reaction as combination, decomposition,single replacement, or double replacement. b.)complete the word equation. c.)using the formulas for both reactants and products, balance the chemical equation. 1. tin(IV)...

business

Which of the following would be more appropriate to present in paragraph form than as a table within a document? Descriptions of the three key events that have lead up to the decision to relocate the business Comparative sales figures, by month, from 2004 to 2007 The names and...

history

"That to secure these rights, governments are instituted among men... Whenever any form of government becomes destructive of these ends, it is the right of the people to alter or to abolish it..." Which of the following historical persons would have been most likely to agree ...

Language Arts - Iambic Pentameter

Please help me with the following: Which lines are written in iambic pentameter? Check all that apply. A. The smoke of my own breath B. And what I assume you shall assume C. I never saw a moor D. Yet certain am I of the spot E. And summer's lease hath all too short a date F. ...

Science

A scientist has noted a possible relationship between a certain chemical substance found in fish and the occurrence of kidney failure in humans. Which of the following preliminary steps should the scientist take before conducting a controlled experiment? A. Establish a cause ...

Precalculus

This is for solving exponential/logarithmic functions: (This is a base e Logarithmic function I would assume): e^(4x)/10 =4^x-2 ? I understand the properties of logs for the most part, but I have a hard time figuring out the step-by-step process on how to solve exponential/log...

Chemistry

The following reaction has ΔG° = -190.60 kJ: H2(g) + Cl2(g) ⇌ 2 HCl (g) All three gases are placed in a sealed vessel. What is the ΔG at -10.5 °C of the system if the pressure of H2 is 3.2 atm, the pressure of Cl2 is 9.7 atm, and the pressure of HCl is 7.65 atm?

chemistry

Saturated solutions of each of the following compounds are made at 20 degree Celsius. Which of the solutions will form a precipitate upon heating? a. NaCl b. Na2SO4 c. Li2CO3 d. sucrose Since water heats at 100 degree Celsius here are there solubility (g/100 g of H2O) ...

Chemistry

Consider the following hypothetical nuclear breakdown: Fermium-258 (Fm-258) loses three alpha particles and two neutrons. What is the new element that is formed (in terms of chemical symbol, atomic number and atomic mass)? I'm not sure how to express this in equation form. ...

Chemistry

Use this reaction for this question: 4NH3 (g) + 2O2 (g) 4NO (g) + 6H2 (g); H = -905 J. Which statement is true about the reaction above? A. G is negative at all temperatures. B. S is negative and G is positive. C. S is negative and G is negative. D. G is positive at all ...

Theology

How can free will be compatible with predestination, when they hold two different views of creaiton? Free will, that God created almost everything, and predestination, that he created everything. Free will and predestination are not compatible. The concepts are also ...

chemistry

Salicyclic acid reacts with methanol to produce methylsalicyclate or winter green and water according to the following reaction: C7H6O3 (s) + CH3OH (l) --> C8H8O3 (s) + H2O (l) What mass methylsalicyclate can be produced from 15.00 grams of salcyclic acid? What mass of ...

Chemistry

0.27 - actual value of AlCl2 1.1173 - theoritical value of Alcl2 % Error = [(0.27-1.1173)/1.1173] * 100 = -76 % What are some reasons for the -76% error. I thought of 2 but i`m not sure if they're right. - we spilled some of the AlCl2 while the reaction was taking place - the ...

Chemistry

The rate constant, k, for each reaction order is equal to _____ from the linear plot. Reaction Order Answer zero ______ first ______ second ______ a. slope (m) b. y-intercept c. x-intercept d. negative of the slope (-m) e. 0 i think zero order is maybe d? not sure

chemistry- Stoichiometry

If 852.04 g Al(NO3)3 reacted with the 741.93 g Na2CO3, which would be the limiting reagent? c. Use the limiting reagent to determine how many grams of Al2(CO3)3 should precipitate out in the reaction. d. If only 341.63 g of Al2(CO3)3 precipitate were actually collected from ...

chem

the balance equation for the reaction of aqueous sulfuric acid with aqueous ammonia is 2NH3(aq)+ H2SO4(aq) -> (NH4)2SO4(aq) 1. what volume of 0.250M sulfuric acid solution would be needed to react completely with 18.00mL of 0.350M ammonia solution? 2. what mass of ammonium ...

Chemistry

In a thermochemistry experiment the reaction of 0.0857 g of an unknown metal and an excess of 4.0 M HCl resulted in a 0.210 mL decrease in the volume of an ice/water mixture. Calculate the enthalpy of this reaction per 1 g of metal reacted. Needed data: density of water at 273...

chemistry 2

the two half-reactions that are used in the direct methanol fuel cell are shown below. I. 2 CH3OH(aq)+2H2O(l)=>2CO2(g)+12H+(aq)+12e- II. 3O2(g)+12H+(aq) +12e-=>6H2O(l) the electrode at which half-reaction I occurs is the ______ at which______ is oxidized, and half-...

chemistry 2

the two half-reactions that are used in the direct methanol fuel cell are shown below. I. 2 CH3OH(aq)+2H2O(l)=>2CO2(g)+12H+(aq)+12e- II. 3O2(g)+12H+(aq) +12e-=>6H2O(l) the electrode at which half-reaction I occurs is the ______ at which______ is oxidized, and half-...

chemistry - exam practice help!!

Given the table below predict the numerical value of the standard cell potential for the reaction: 2 Cr(s) + 3 Cu2+(aq) 2 Cr3+(aq) + 3 Cu(s) Half Reaction E (volts) (1) Cr3+ + 3 e- Cr E= -0.74 (2) Cr3+ + e- Cr2+ E=-0.41 (3) Cr2O72- + 14 H+ + 6 e- 2 Cr3+ + 7 H2O E= 1.33 (4) Cu...

Chemistry

Can somebody help me with this question? Zinc metal is placed in a solution of copper ions and undergoes an oxidation-reduction reaction. Which direction is the spontaneous reaction? Zn metal goes into solution. Cu(II) ions come out. Zn + Cu+2 ==> Zn+2 + Cuo Zn metal is ...

Geometry B

The equation x2 + y2 − 2x + 2y − 1 = 0 is the general form of the equation of a circle. What is the standard form of the equation?

chemistry

A researcher put 10.0 moles of N2O into a 2-L container at some temperature where it decomposes according to the following: N2O = 2N2+ O2. At equilibrium 2.20 moles of N2O remain. Calculate the Kc for the reaction. How am I supposed to fill in the ICE chart if Kc isn't given ...

CHEMISTRY: URGENT DRBob222

A mixture of 0.50 mol of ethanoic acid and 1.00 mol of ethanol was shaken for a long time to reach equilibrium. The whole mixture was titrated quickly with 1.00 mol dm3 sodium hydroxide and 80cm3 of alkali were required. 1. Write an equation for the reaction between ethanoic ...

Chemistry

I'm doing chemical equilibrium, and there's a question in my lecture notes. Can someone check my answers and tell me if i'm right or wrong? Thanks! The Kc expression for this reversible reaction: 3Fe(s) + 4H2O (g) --><-- Fe3O4(s) + 4H2 (g) is [H2]^4 / [H2O]^4 Am I ...

Immigration

Should applications from certain countries be given priority?

geography

Is there a certain rhyme out there to help study state capitals?

Physics

Does the uncertainty principle tell us that we can never know anything for certain?

Integration

How should i integrate (4cos^2 - 1)? Do I use a certain formula??

science

how far something travels in a certain amount of time is the?

physics

why fans are placed at certain height below celing?

ETH

Should applications from certain countries be given priority?

social studies

how do you find out what century a certain year is in?

english

i need to find variations of certain words. what does this mean?

Algebra 2

How would I find the interest rate of a certain amount?

science

what are the number of digits in a measurement that are known with a certain degree of reliability?

math

at what rate of interest a certain sum will be doubled in 8 year?

chem

If a measured quantity is written correctly, which digits are certain?

chemistry

why are there only certain colours in an atomic emission spectra?

Mathematics - Trigonometric

An electric motor turns at 2400 revolutions per minute or 2400 r/m. Find the angular velocity, in radians per second, in exact form and in approximate form, to the nearest hundredth. -------- This is what I've done so far and I don't know what to do next ... 2400 r/m divided ...

Science (Chemisty)

In an old "Star Trek" episode, Captain Kirk and Spock come across a life form called the Horta made mostly of silicon compounds. Based on silicon's place in the periodic table, do you think silicon compounds are a reasonable choice for an alien life form? Why or why not?

Chemistry

Consider the reaction: Mg + I2 -> MgI2. Identify the limiting reagent in of the reaction mixtures. 1. 100 atoms of Mg and 100 molecules of I2. 2. 150 atoms of Mg and 100 molecules of I2. 4. 0.16 mol Mg and 0.25 mol I2. 5. 0.14 mol Mg and 0.14 mol I2. 6. 6.078 g Mg and 63.46...

Intro Chemistry

Given: C2H2(g) +2HF(g) -> C2H4F2(g) Find: pressure in a 10.0L flask when the reaction is complete When 1.0 mol of C2H2 and 5.0 mol pf HF are reacted in a 10.0 L flask, what will be the pressure in the flask at 0 degrees C when the reaction is complete?

c

The voltage of an electrochemical cell depends on the redox reaction occurring in the cell. Given a redox reaction below: Zn(s) + Pb2+(aq) --> Zn2+(aq) + Pb(s) Pb2+(aq) + 2 e--->Pb(s)Eº = -0.13V Zn2+(aq) + 2 e--->Zn(s)Eº = -0.76V Calculate the E.M.F (Voltage) of the...

add maths

Find f^-1 in similar form for each of the following functions. Question no. 1 ↓ f:x→3x over x-3,x not equal to 3 Question no. 2 ↓ f:x→2x+4 over 2x-1,x not equal to 1over2

Chemistry

A concentration cell based on the following half reaction at 317 K (Cu^2+) + (2e-) --> (Cu) SRP = 0.34 V Has initial concentrations of 1.33 M Cu2+, 0.393 M Cu2+, and a potential of 0.01665 V at these conditions. After 4.1 hours the new potential of the cell is found to be 0...

math

1) A gardener wants to plant flowers 10 feet form the base of a flag pole. When he has completed the task, describe in detail what geometric shape the planted flowers will form? 2) Describe the locus of points 5 units from the line whose equation is y=3 on a coordinate graph. ...

organic chemistry

Describe and explain how each of the following experimental errors or variations might affect your results. (a) you failed to dry the reaction flask after washing it with water. (b) you forgot to add the sulfuric acid. (c) you used twice the amount of acetic acid specified in ...

chemistry

Determine the ratio of cations to anions for the following ionic compounds a. potassium, a salt substance b. calcium floride, used in steel industry c. aluminum oxide, known as corundum in the crystalline form d. calcium oxide, used to remove sulfur dioxide from power plant ...

Reading/language arts

Write a sentence for the given topic, using a form of one of the following linking verbs in each sentence: smell, sound, feel, taste, grow. Use at least one predicate noun or predicate adjective in each sentence. 1) (dificulty or ease of writing) can you please help me by ...

Art Ms. Sue?? Writeacher??

Nineteenth-century sculptor Cordier also created busts of African men and women in addition to African Venus. Which of the following was most likely his source of inspiration? -interest in the African form -promoting human justice*** -promoting the importance of slavery -...

Chemistry

The mechanism for the reaction described by 2N2O5(g) ---> 4NO2(g) + O2(g) is suggested to be (1) N2O5(g) (k1)--->(K-1) NO2(g) + NO3(g) (2) NO2(g) + NO3(g) --->(K2) NO2(g) + O2(g) + NO(g) (3) NO(g) + N2O5(g) --->(K3) 3NO2(g) Assuming that [NO3] is governed by steady...

math , algebra

Let me know if this is correct : (1)Finding the lcm using which ever method for:5,15 , and 20 8:2x2x2x3x5x5 15:2x2x2x3x5x5 20:2x2x2x3x5x5 --------------- LCM:2x2x2x3x5x5 After simplification LCM:120 (2)Find the GCF for each of the following numbers: 36, 64, 180 Prime Factors ...

Chem

Solid magnesium metal reacts with chlorine gas according to the following equation: Mg + Cl2 --> MgCl2 What mass of magnesium chloride is formed in the reaction between 7 g of Mg and 7.9 g of Cl2 use the masses to two decimal places on the chart in the front of your text ...

chemistry

In the following reaction, how many grams of lead(II) nitrate Pb(NO3)2 will produce 425 grams of sodium nitrate (NaNO3)? Pb(NO3)2(aq) + 2 NaBr(aq) PbBr2(s) + 2 NaNO3(aq) The molar mass of Pb(NO3)2 is 331.21 grams and that of NaNO3 is 85 grams.

Chemistry

Enthalpy Change Given the following reactions: S(s) + O2(g) → SO2(g) ΔH = -297 kJ/mol SO2(g) + ½ O2(g) → SO3(g) ΔH = -141 kJ/mol Calculate the ΔH for the reaction: S(s) + 3/2O2(g) → SO3(g)

maths

consider the sequence given by U1=-0.3 Un+1=Un+0.7 i)state what type of sequence this is. ii)write down the first 4 terms of the sequence. iii) find a closed form for sequnce. iv) use the closed form to find the nth term of the sequnce when Un=36.1 (n=1,2,3 ETC)

Algebra

List the coordinate of any two points on the graph in (x,y)form. The numbers on the horizontal axis are 1,0,2,0,3,0, 4.0 and 5.0 (___,___), (___,____) Find the slope of this line Find the linear equation of this line in slope-intercept form.

Possessive form

Cross out each incorrect possessive noun. Write correct possessive form. .......Small acts of kindness made the outcast's lives better. Answer Cross out outcast's Replace outcasts'

precalculus

5x+3y=8 convert each rectangular equation to polar form Convert each polar equation to rectangular form: a r=9cos0 b r=5 c rsq= cos 20 d r= 3____ 3+sin 0 Is this a test?

Math

How do I put this equation in slope intercept form? 2. 2x + 3y = 6 Slope intercept form is y = mx + b Subtract 2x from both sides and then divide both sides by 3. I hope this helps. Thanks for asking.

college algebra

find the complex zeros of the polynomial function. write f in factored form. use complex zeros to write f in factored form f(x)= x^3-6x^2+21x-26

Math

The parametric equation {x=t^2+4t+8 ; y=t+4 a. Reduce the equation to simplest rectangular form b. Determine the Center and the type of graph of the resulting equation. c. Graph the equation in rectangular form

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