# For the reaction H2(g) + I2(g) ↔ 2 HI(g), you have the initial concentrations [H2] = 0.15 and [I2] = 0.05. Keq for the reaction at this temperature is 4.5 x 10-6. Make a reaction table. Include rows for initial

23,099 results, page 19
1. ## chemistry

In a reaction vessel, the following reaction was carried out using 0.250 mol of NH3 and 0.100 mol of N2, 4NH3(l) + N2 (g) = 3N2H4 (l) what is the compositon in moles in the vessel when the reaction is completed? Is the answer: 0 mol NH3, 0.063 mol N2, and

asked by Lisa on November 14, 2011
2. ## Maths

Experiments show that the concentration of substance X in a ﬁrst order chemical reaction at future time (in seconds) t i.e. [X] is described by the following diﬀerential equation: d[X]/ dt= .001[X], ﬁnd: (a) Find an expression for the concentration

asked by sam on March 22, 2018
3. ## Chem

The initial concentration for the compounds involved in the reaction displayed were determined to be [NO2(g)] = 1.243 mol/L, [N2O4(g)] = 0.2578 mol/L. Calculate the value of the equilibrium constant (Kc) at 500.0 K if the equilibrium concentration of

asked by Ulanda on September 30, 2011
4. ## chem

N2H4 is decomposed in a closed container according to this reaction: N2H4 → N2 + 2H2 . If the temperature is constant and the initial pressure of N2H4 is 800mm, what will the pressure in millimeters be after the decomposition to N2 + 2H2? Im having

asked by tomas on May 1, 2017
5. ## Chemistry

A student titrates HCl with 0.0125M KOH. Starting with 50.00 ml of the acid it takes 40.0 ml of base to reach equilavence point. A. What is the concentration of the HCl? B. What is the initial pH of the acid solution? C. What is the pH of the reaction

asked by Joseph on March 29, 2011
6. ## Chemistry

Nitric oxide reacts with chlorine to form nitrosyl chloride, NOCl. Use the following data to determine the rate equation for the reaction. NO + (1/2)Cl2 -> NOCl Expt.[NO] [Cl2] Initial rate 1 0.22 0.065 0.96 M/min 2 0.66 0.065 8.6 M/min 3 0.44 0.032 1.9

asked by Anonymous on February 7, 2013
7. ## Chemistry

A student titrates HCl with 0.0125M KOH. Starting with 50.00 ml of the acid it takes 40.0 ml of base to reach equilavence point. A. What is the concentration of the HCl? B. What is the initial pH of the acid solution? C. What is the pH of the reaction

asked by Joseph on March 31, 2011
8. ## Chemistry

A student titrates HCl with 0.0125M KOH. Starting with 50.00 ml of the acid it takes 40.0 ml of base to reach equilavence point. A. What is the concentration of the HCl? B. What is the initial pH of the acid solution? C. What is the pH of the reaction

asked by Joseph on March 29, 2011
9. ## Chemistry

Tooth enamel consist mainly of hydroxyapatite (Ca5(PO4)3(OH). When tine (II) Flouride is added to toothpaste it reacts with the enamel to product a more decay-resistant material fluorapatite (Ca(PO4)3F. The by-products of this reaction are tin (II) oxide

asked by Scott on February 28, 2017
10. ## Chemistry

Sulfur dioxide is used to make sulfuric acid. one method of producing it is by roasting mineral sulfides, for example, FeS2(s) + O2 (g) ---> SO2(g) + Fe2O3(s) (unbalanced). A production error leads to the sulfide being placed in a 950-L vessel with

asked by Tori on October 27, 2011
11. ## Chemistry

Explain the following observation in terms of the collision theory, restricting each to about 25 words. NO(g) + O3(g)--> NO2(g) + O2(g) (a) An increase in temperature increases the reaction rate. (b) Compressing the gases into a smaller volume increases

asked by Patrick on January 20, 2011
12. ## Physics

A ball is thrown upward from the ground with an initial speed of 25 m/s; at the same instant, a ball dropped from rest from a building 15 m high. After how long will the balls be at the same height? The equations I have is final velocity squared = initial

asked by Becca on September 25, 2006
13. ## Chemistry( HELP PLEASE, IM DESPERATE!!!)

For the reaction 2CH3OH + 3O2 → 2CO2+ 4H2O, what is the maximum amount of CO2 which could be formed from 13.97 g of CH3OH and 5.45 g of O2? Consider the reaction H3PO4 + 3NaOH → Na3PO4 + 3H2O. How much Na3PO4 can be prepared by the reaction of 3.43 g

asked by Farrell on March 12, 2015
14. ## chemistry

A student didn’t read step 4 in the procedure and assembled the cells based on Figure 1, connecting the device to the ammeter right away. When she gets to step 5 she realizes her error, but instead of estimating the initial reaction time she simply notes

asked by anaoymus on July 8, 2014
15. ## Chemistry

The following reaction represent a propsed reaction mechanism for the formation C(C6H5)3OH from C(C6H3)3Cl. Step 1: C(C6H5)3Cl--> C(C6H5)3^+ + Cl- Step 2: C(C6H5)3^+ + OH- --> C(C6H5)3OH What are the intermediate product(s) of the net reaction? Explain

asked by jonah on August 9, 2015
16. ## Chemistry

The following reaction represent a propsed reaction mechanism for the formation C(C6H5)3OH from C(C6H3)3Cl. Step 1: C(C6H5)3Cl--> C(C6H5)3^+ + Cl- Step 2: C(C6H5)3^+ + OH- --> C(C6H5)3OH What are the intermediate product(s) of the net reaction? Explain

asked by Jake on August 11, 2015
17. ## General Chemistry

I have been going at part B of this problem for a few hours. I've completed an ice table and calculated the total number of moles based off pressure but am still unable to come up with the partial pressures. If someone could provide the steps for solving I

asked by Duke on January 28, 2016
18. ## Physics

An object slides down an inclined plane of initial height of 30m.its velocity at the foot of the plane is 20m..find the fraction of the initial potential energy which is dissipated as heat

asked by McPete on October 17, 2014

A man tosses a ball upward. It reaches its highest point after 25 seconds. Find its initial velocity. Alright, so I tried solving this. I used the equations (let v = initial velocity): h = v^2 / 2g , and h = (v*t) - (1/2)(g)(t^2) and I got 101.48 m/s. Is

asked by Rin on September 11, 2014
20. ## chemistry

When the reaction is run in a buffer solution, however, it is pseudo-first-order in CH3I. rate = k[CH3] What is the half-life of this reaction in a pH 10.00 buffer if the pseudo-first-order rate constant for this reaction is 7.3 x10-9 s-1?

asked by anglo on June 5, 2009
21. ## Biochemistry

The ΔG°' for the reaction Citrate isocitrate is +6.64 kJmol-1= +1.59 kcalmol-1. The ΔG°' for the reaction Isocitrate α-Ketoglutarate is -267kJmol-1 = -63.9 kcalmol-1 What is the ΔG°' for the conversion of citrate to α-Ketoglutarate? Is that

asked by Jazmine on April 1, 2016
22. ## Reaction Kinetics

I have been studying a journal, and their objective is to find the ignition temperature, which can shift a reaction from being kinetics-controlled to being diffusion-controlled. What is the advantage of a reaction being diffusion-controlled over a reaction

asked by Namie on May 9, 2012
23. ## chemistry

Answer the question(s) below about the following reaction. 2H2O2 (l) → 2H2O(g) + O2(g) If 50.0 grams hydrogen peroxide produce 15.0 g oxygen, what is the percent yield for this reaction?

asked by Anonymous on November 8, 2013
24. ## ochem

Give the reaction products of sodium borohydride (followed by water addition at the end of the reaction) with the following compounds: a) Acetone b) m-nitroacetophenone c) 3-buten-2-one

asked by ang on May 8, 2013

The deltaS for a reaction is 3.0 J/(mol*K) at 25 degrees C. Caluculate the deltaG for the reaction when DeltaH = -394 kL and determine whether it will occur spontaneously at this temperature

asked by Maria on June 8, 2010
26. ## Chemistry

The activation energy of a certain reaction is 34.9kJ/mol . At 23 ∘C , the rate constant is 0.0190s−1. At what temperature in degrees Celsius would this reaction go twice as fast?

asked by Kat on February 24, 2014
27. ## chemistry

Consider the following reaction. 4Fe + 3O2 2Fe2O3 a. How many moles of O2 are required to react completely with 46.7 mg of Fe? How many grams Fe2O3, are produced from the complete reaction of 20.1 g of Fe?

asked by sam on October 10, 2016
28. ## Chemistry

what mass of acetylene, will be produced from the reaction of 90g of calcium carbide, with water inthe following reaction CaC2+2H2O-C2H2+Ca(OH)2

asked by Kiara on April 20, 2010
29. ## chemistry

In the following reaction which side of the reaction will be favored by a decrease in pressure. a) reactant b) product c) neither 4HCL(g)+O2(g)->2H2O(g)+2Cl2(g)+114.4KJ

asked by tamara on January 15, 2012
30. ## Chemistry

Find the change in internal energy for this reaction. Enter in kJ. 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l) Enthalpy of reaction= -2599 kJ

asked by Kales on October 23, 2014
31. ## Chemistry

I'm looking for a video of a chemical reaction that can help me answer these questions What are the names of the reactants and products and their states @ room temperature? What type of reaction is it?

asked by Anonymous on December 1, 2014
32. ## Chemistry

How many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of products? Consider the following reaction: 4HCl(g)+ O2(g)to 2H2O +2Cl2(g)

asked by Brian on September 28, 2010
33. ## chem

balance the reaction using the half reaction method. OsO4 + C2H4 -> Os + CO2 worksheet does not show if it is in a gas and aqueous state.

asked by bekah on December 15, 2014
34. ## chem

Wwrite a balanced equation for the following chemical processes: the reaction between NaOH an dsalicyclic acid; the reaction between HCl and socium benzoate.

asked by Mandy on June 3, 2009
35. ## chemistry

From the enthalpies of reaction 2C(s)+O2(g)¨2CO(g)ƒ¢H=−221.0kJ 2C(s)+O2(g)+4H2(g)¨2CH3OH(g)ƒ¢H=−402.4kJ calculate ƒ¢H for the reaction CO(g)+2H2(g)¨CH3OH(g)

asked by ryno on April 13, 2016
36. ## science

0.042g of Magnesium was reacted with excess HCl at S.T.P. A. Write the equation for the reaction B. How many moles of Mg were used? C. What volume of Hydrogen is produced in this reaction?_

asked by sai on November 28, 2012
37. ## Chemistry

According to the following reaction, how many moles of water will be formed upon the complete reaction of 22.6 grams of hydrochloric acid with excess iron(III) oxide?

asked by Dalton on December 3, 2009
38. ## Math

Using h(t)=gt^2+v0t+h0, where g= -16, h0= initial height, v0= initial velocity, and t= time A rocket is fired into the air from the top of a building that is 200 feet tall. The initial velocity of the rocket is 600 feet/sec. If necessary, round answers to

asked by Brandon on April 15, 2012
39. ## Chemistry

consider the following reaction mechanism 2A+B->B+C B+D->E+C What is the rate law for step 2 of this reaction?

asked by Candice on February 8, 2011
40. ## chemistry 2

What does a negative E cell indicate about a redox reaction? What does is indicate about the reverse reaction?

asked by anonymous on April 22, 2012
41. ## Chemistry

Which reaction has been chosen as the 'standard' against which every other reaction is measured? A. F2 + 2e ---> 2F– B. O2 + 4H+ + 4e ---->2H2O C. 2H+ + 2e---> H2 D. Li+ + e ---> Li E. H2 + 2e --->2H i got C is that right?

asked by Amy on May 9, 2008
42. ## Chemistry

What is the chemical reaction for: The reaction of propanoic acid and 1-butanol

asked by Ceamus Angelina on June 3, 2018
43. ## chem

Which reaction has been chosen as the 'standard' against which every other reaction is measured? A. Li+ + e– --> Li B. F2 + 2e– --> 2F– C. 2H+ + 2e– --> H2 D. O2 + 4H+ + 4e– ==> 2H2O E. H2 + 2e– ==> 2H

asked by Matt on April 19, 2008
44. ## Chem

How us the speed of a chemical reaction related to the spontaneity of the reaction?

asked by Alex on March 2, 2010
45. ## Chemistry

What is the reaction between mno4- and c2o42- and is there a colour change in this reaction?

asked by Ashley on June 26, 2014
46. ## s

what is not a synthesis reaction 2H20 --2h2 +02 is this not a syn reaction

asked by mike on September 19, 2007
47. ## science

The reaction h2so4+naoh->bahso4+h20 is what reaction

asked by shibani on June 23, 2015
48. ## chemistry

A reaction has ÄH = -378 kJ and ÄS = -37 J/K. Calculate ÄG at 25°C to confirm that the reaction is spontaneous. in kJ

49. ## chemistry

what is the difference between acid base reaction and oxidation reaction

asked by ANON on September 16, 2009
50. ## biology

The only thing my biology teacher told us about the NADP (in photosynthesis light dependent reaction) is that it's a bus driver. Why is it a bus driver? Is it cos it collects the H+ ion into the light independent reaction (NADPH) then "drops" it off and

asked by dee on October 1, 2010
51. ## Chemistry

Dinitrogen tetroxide decomposes to nitrogen dioxide: N2O4 (g) ---> 2NO2 (g) Delta H rxn: 55.3 kJ At 298 K a reaction vessel initially containing .100 atm of N2O4. When equilibrium is reached, 58% of the N2O4 has decomposed to NO2. -What percentage of N2O4

asked by Tyler on July 18, 2011
52. ## Chemistry

Dinitrogen tetroxide decomposes to nitrogen dioxide: N2O4(g)→2NO2(g)ΔHorxn=55.3kJ At 298 K, a reaction vessel initially contains 0.100 atm of N2O4. When equilibrium is reached, 58% of the N2O4 has decomposed to NO2. What percentage of N2O4 decomposes at

asked by Justiss on April 21, 2017
53. ## chemistry

The problem is as follows: The toxic metal cadmium Cd2+ has a tendency to complex with as many as 4 Cl- ions. The complexation reactions can be written as: Cd2+ + Cl- ---> CdCl+ log Kf,1 = 1.98 Cd2+ + 2Cl- ---> CdCl2^0 log Kf,2 =2.60 Cd2+ + 3Cl- --->

asked by Will on September 15, 2016
54. ## Chemistry

is this right Consider the following reaction at equilibrium N2(g) + O2(g) + heat < = > 2NO(g) Indicate how each of the following will shift the equilibrium a. raising the temperature of the reaction. b. decreasing the volume of the reaction container. c.

asked by Jason on December 6, 2010
55. ## Chem

did I do this right Consider the following reaction at equilibrium N2(g) + O2(g) + heat < = > 2NO(g) Indicate how each of the following will shift the equilibrium a. raising the temperature of the reaction. b. decreasing the volume of the reaction

asked by Jason on December 7, 2010
56. ## Chemistry

Phosphorous trichloride (PCl3) is produced from the reaction of white phosphorous (P4) and chlorine: P4(s) + 6Cl2(g) --> 4 PCl3(g) . A sample of PCl3 of mass 280.7 g was collected from the reaction of 70.86 g of P4 with excess chlorine. What is the

asked by Harry on March 23, 2011
57. ## chemistry

The isomerization reaction H3CNC(g) H3CCN(g) was found to be first order in H3CNC. At 600 K, the concentration of H3CNC is 75% of its original value after 205 s. (a) What is the rate constant for this isomerization reaction at 600 K? (b) At what time will

asked by Alexis on August 6, 2008
58. ## another A.P Chemistry Question

A different rigid 5.00L cylinder contains 0.176mol of NO(g) at 298 k. A 0.176mol sample of 02(g) is added to the cylinder, where a reaction occurs to produce NO2(g) (d) write the balanced equation for the reaction. (e) calculate the total pressure, in atm,

asked by T-Baby on October 23, 2006
59. ## Chemistry due soon

What is enthalpy? A. Enthalpy is the kinetic energy of a system. B. Enthalpy is the heat involved in a reaction. C. Enthalpy is the temperature of a reaction. D. Enthalpy is the mass involved in a reaction. I think the answer is a or b

asked by Morgan on November 7, 2014
60. ## chemistry

Methane (CH4) is the main component of natural gas. It is burned for fuel in a combustion reaction. The unbalanced combustion reaction for methane is shown below. CH4 + O2 CO2 + H2O + heat When the reaction is balanced, how many carbon dioxide molecules

asked by Sarah on August 16, 2017
61. ## PLZZZ HELP

Heat of Combustion of paraffin wax Initial mass of candle 40.3g Mass of tin calorimeter 41.1g Mass of half-filled calorimeter with water 220.4g Initial temp of water 18.8°C Final temp of water 26.6°C Final mass of candle 38.2g Calculate heat of

asked by CHEMISTRY on September 9, 2017
62. ## Chemistry

Heat of Combustion of paraffin wax Initial mass of candle 40.3g Mass of tin calorimeter 41.1g Mass of half-filled calorimeter with water 220.4g Initial temp of water 18.8°C Final temp of water 26.6°C Final mass of candle 38.2g Calculate heat of

asked by Anonymous on September 9, 2017
63. ## Chemistry

From your experience, predict which of the following reactions are spontaneous. a) Zn(s) + 2H+(aq)--> Zn+2(aq) + H2 (g) b) CaCO3(s) + 2H2O(l) --> Ca(OH)2(s) + H2CO3(aq) c) CH4(g) + O2(g) --> CO2(g) + 2H2O(g) d) Ag+(aq) + Cl-(aq) --> AgCl (s) Our book

asked by Chris on February 15, 2007
64. ## Chemistry

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 26, 2015
65. ## Chemistry

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 26, 2015
66. ## chemistry help!!!

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 25, 2015
67. ## chemistry help!

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by mark on October 26, 2015
68. ## chemistry help!!!

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 25, 2015
69. ## CHEMISTRY!!!!

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 26, 2015
70. ## CHEMISTRY!!!!

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 26, 2015
71. ## chemistry

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 25, 2015
72. ## Separation of Racemate

Compare the relative reaction rates of 1-bromobutane, 2-bromopropane, and 2-bromomethylpropane under SN1 reaction conditions. Silver nitrate will be used to provide nitrate ion as the nucleophile to produce alkyl nitrates as products. 1) You have a choice

asked by Jesicca on October 14, 2014
73. ## Separation of Racemate- Chemistry Lab

Compare the relative reaction rates of 1-bromobutane, 2-bromopropane, and 2-bromomethylpropane under SN1 reaction conditions. Silver nitrate will be used to provide nitrate ion as the nucleophile to produce alkyl nitrates as products. 1) You have a choice

asked by Jesicca on October 14, 2014
74. ## CHEMISTRY

I put down all the info that I found but I cant figure out the questions 1 & 2 at the bottom!! Empty Calorimeter- 11.6 g Room temp - 21 degrees celcius Three different experiments of 50mL 1(M) HCl reacts with 0.15 g Mg, 0.25g Mg, and 0.35g Mg respectively.

asked by Anonymous on November 8, 2010
75. ## Chemistry

Calculate the rate constant, k, for the reaction 2H2O2(l) --> 2H2O(l) + O2(g) Using the rate, - 0.02 mol/L.min H2O2, and the initial concentration, [H2O2] = 0.5 mol/L Question 7 options: - 25/min 25/min - 0.04/min 0.04/min

asked by Tamera on November 6, 2014
76. ## Chemistry

Calculate the work involved if a reaction with an enthalpy change of -2418 kJ is carried out in a vessel with a mobile, frictionless piston. Other details: the reaction is H2(g) + 1/2Oxygen2(g) yields H2O(g) with enthalpy change of -241.8 kJ/mol. The

asked by Mark on November 23, 2008
77. ## chem

consider the cell Pt(s)I H2 (g. 0.100 bar)I H+ (aq, pH= 2.54)IICl^- ( aq, 0.200 MI Hg2Cl2(S)IHg (l)IPt(s) a. write a reduction reaction and nernst equation for each half- cell. For the Hg2Cl2 half reaction, E^0 = 0.268 V b. Find E for the net cell reaction

asked by katya on November 17, 2008
78. ## Chemistry help

I am not to sure how to approach the problem... Hydrazine is used as a rocket fuel because its reaction with oxygen is extremely exothermic: N2H4(liquid) + O2(g) ==> N2(g) + 2H2O(liquid) ΔH(reaction) = -615 kJ mol-1 What is the enthalpy of this reaction

asked by Anonymous on May 11, 2014
79. ## Chemistry

Consider the reaction: CO(g) + H2O (g) CO2(g)+H2(g) which of the following initial composition will NOT achieve equlibrium? a) 0.25 mol H2, 0.35 mol CO2, and 0.25 mol CO b) 0.25 mol CO, 0.75 mol H2O c) 1.0 mol of CO2 and 0.50 mol H2 d) 0.85 mol CO and 0.25

asked by Ania on November 9, 2012
80. ## chemistry

Predict the effect of each of the following on the indicated equilibrium system in terms of which reaction will be favored (forward, reverse, or neither) H2(g)+Cl2(g)2HCl(g) +184 kJ A)addition of Cl2 B)removal of HCl C)increased pressure D)decreased

asked by Kristy on May 23, 2007
81. ## Chemistry

For the reaction: 2H+(aq) + CO3-2(aq) --> CO2(g) + H2O(l) A. Calculate the deltaHºrxn for the reaction. Given deltaHºf for CO3-2(aq) = -677.1 kJ/mol. B. Using the above reaction, what would be the final temperature of a coffee cup calorimeter when 0.104

asked by Millie on December 15, 2010
82. ## physics

Find the threshold energy that the incident neutron must have to produce the reaction 1 n 0 + 4 He 2---> 2 H 1 + 3 H 1 For this, like the 1 n 0

asked by jaimie on February 16, 2007
83. ## physics

a juggler throws a ball with an initial horizontal velocity of +1.1 m/s and an initial vertical velocity of +5.7 m/s. What is its acceleration at the top of its flight path? make sure to consider the sign when responding. consider the upward direction as

asked by aimee on June 24, 2011
84. ## physic

A golfer hits his approach shot at an angle of θ = 52.8°, giving the ball an initial speed of v0 = 37.0 m/s (see figure below). The ball lands on the elevated green, yf = 5.3 m above the initial position near the hole, and stops immediately.

asked by joy on February 1, 2018
85. ## Physics

A juggler throws a ball with an initial horizontal velocity of +1.1 m/s and an initial vertical velocity of +5.7 m/s. What is its acceleration at the top of its flight path? Make sure to consider the sign when responding. Consider the upward direction as

asked by Alexandra on September 13, 2014
86. ## physics

After a completely inelastic collision between two objects of equal mass, each having initial speed v, the two move off together with speed v/6. What was the angle between their initial directions? if this is the equation 2mvcos(theta)=2mv/6 what numbers

asked by Haley on March 20, 2011
87. ## Physics

In deep space, a 636 kg space probe, travels with an initial velocity of 19 m/s. Retro-rockets fire, producing a 212 N force in the opposite direction of the probe's initial velocity. How many seconds until the probe has a velocity of 22 m/s in the

asked by Emma on May 27, 2015
88. ## Physics

In deep space, a 636 kg space probe, travels with an initial velocity of 19 m/s. Retro-rockets fire, producing a 212 N force in the opposite direction of the probe's initial velocity. How many seconds until the probe has a velocity of 22 m/s in the

asked by Emma on May 26, 2015
89. ## Physics

At what angle is an object launched if its initial vertical speed is 3.75 m/s and its initial horizontal speed is 4.50 m/s?

asked by Annie on July 6, 2011
90. ## physical

At what angle is an object launched if its initial vertical speed is 3.75 m/s and its initial horizontal speed is 4.50 m/s?

asked by Annie on July 6, 2011
91. ## physics

A 5.00 kg particle moving along the x-axis at an initial velocity of 4.5 m/s. what is the initial kinetic energy of the particle?

asked by Anonymous on December 4, 2012
92. ## physics

how to solve for velocity using these values... distance time(s) 28.5 (initial) 4.26 (initial) 89 (final) 6.77 (final)

asked by meghan on September 28, 2011
93. ## physics

if acceleration is -9.8, initial velocity is 10, initial position of a point is +0.5m. then when does it pass y=0 and what is the velocity at that time

asked by sweety on March 6, 2009
94. ## Chem 2

need to figure out how to calculate. the value of DeltaH for the reaction below is -72kj_____kj of heat are released when 1.0 mole of HBr is formed in this reaction. H2(g)*Br2(g)> 2HBr(g) I know the answer is 36 but need help

asked by Debbie on March 30, 2012
95. ## Chemistry

The following chemical reaction takes place in aqueous solution: MnBr2(aq) + 2KOH (aq) → Mn(OH)2 (s) + 2KBr (aq) Write the net ionic equation for this reaction.

asked by Mia on October 31, 2018
96. ## chem

The activation energy of a certain reaction is 30.3 kJ/mol. At 20 C, the rate constant is 0.0130 s^{-1}. At what temperature would this reaction go twice as fast? Can't you use Arrhenius' equation for this. Look it up. You have Ea. you have T1. You have k1

asked by kim on February 7, 2007
97. ## chemistry

If it takes 30 seconds for a reactant concentration to decrease from 1.0 M to 0.5 M in a first-order chemical reaction, then what is the rate constant for the reaction? A. 43 s–1 B. 0.046 s–1 C. 0.023 s–1 D. 0.033 s–1

asked by Cortney on March 25, 2015
98. ## chem

if a car produces 81g of {\rm CO_2}, how many grams of {\rm O_2} are used up in the reaction? the complete chem reaction is C2H6O+3O2--->2CO2+3H2O

asked by tracy on October 19, 2012
99. ## chemistry

Consider the following reaction at equilibrium: 2NH3 (g) N2 (g) + 3H2 (g) ΔH° = +92.4 kJ Le Cha ^ telier's principle predicts that increasing the temperature will shift the reaction to the. a) stays same b)leftc)none d)right

asked by richy on November 19, 2010
100. ## chemistry

Given one of the starting materials and end product for the following reaction, show all reactants, reaction conditions in brackets (where known) and products. ethanol from calcium carbide

asked by Priya on April 30, 2008