# 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

23,145 results, page 27
1. ## chemistry

Consider the combustion reaction: C3H8 (g) + 5 O2(g) ---> 3 CO2(g) + 4H2O(g), where triangle symbol H= - 531 kcal/mol. If 6.70 x 10 to the 4th kcal of energy is released in the reaction, How many grams of oxygen were consumed

asked by sukanya on February 17, 2011
2. ## Chemistry

When a mixture of 10.0 g of acetylene and 10.0 g of oxygen is ignited, a complete combustion of the reactants takes place. What is the limiting reagent of this reaction? How many grams of each of the reactants and products are present at the end of the

asked by Destiny on October 10, 2011
3. ## Chemistry

The Energy from glucose is obtained from the oxidation reaction C6H12O6 + 6O2 --> 6CO2 + 6H2O How would a similar reaction look for Sucrose? I am trying to find an equation about how the body uses a compound, in this case sucrose. I'm just not sure how

asked by James on March 22, 2012
4. ## chem class

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 i was told right by some

asked by richy on November 19, 2010
5. ## Chemistry

What type of reaction occurs when potassiumbromide solution is mixed. With lead(II) acetate solution? Gas evolution, oxidation reduction, precipitation, acid-base neutralization, or no reaction

asked by Coug on January 8, 2010
6. ## 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 i was told right by some

asked by richy on November 19, 2010
7. ## physics

Calculate the range of the projectile using the initial speed and angle. Use g = 9.8m/s your calculation. Initial speed is 18m/s Angle is 75 Help please !!

asked by jacob on April 13, 2015
8. ## physics

I need help understanding these, please. Thanks! 1. A 2 kg body moves with constant velocity when a force of 10 N is applied. What is the coefficient of kinetic friction between the table and the body? (Would I use F=m*g for this??) 2. Which of the

asked by Ellie on October 4, 2015
9. ## chemistry

The equilibrium constant for the reaction Cu3(PO4)2(s)    3 Cu2+(aq)  +  2 PO43–(aq) is K = 1.40 x 10–37.  Suppose that a beaker is filled to 1 L with a solution containing [Cu2+] = [PO43–] = 10.0 nM, and 300.0 g Cu3(PO4)2 . Which of

asked by jess on June 7, 2016
10. ## The Nature of Chemical Reactions

1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of

asked by Anonymous on October 23, 2011
11. ## Chemistry..

1.What is going on at the atomic level if a precipitate forms in a double replacement reaction? 2. Has a single or double replacement reaction occured if water or a gas is formed? What would you perceive as evidence that a reaction has occured if either

asked by Anonymous on January 11, 2013
12. ## Chem Titration and pH

Calculate the pH at 0mL, 5mL,...40mL for a 10.0mL aliquote of 0.100M Na3AsO4 (weak base) titrated with 0.100M HCl pKa1 = 2.25 pKa2 = 6.77 pKa3 = 11.60 Thank you First you should write equations to know where we are in the titration. At the beginning, we

asked by julie on October 7, 2006
13. ## Chemistry

Is the following reaction spontaneous at 25*C? delta s reaction = -217 J/K*mol delta H rxn = -1202 KJ 2Mg (s) + O2 (g) -> 2MgO (s) delta suniverse = delta s system - delta H system / T i got positive (+) 3.81 x 10 ^ 3 J/K and my notes says it is

asked by ChemLover on June 8, 2011
14. ## general chemistry

. The thermal decomposition of dinitrogen pentoxide in the gas phase to give nitrogen dioxide and oxygen is a first order reaction. If the half life at 55 °C is 410 s, what is the value of the rate constant k? If the initial concentration of dinitrogen

asked by susie on October 22, 2009
15. ## chemistry

The thermal decomposition of dinitrogen pentoxide in the gas phase to give nitrogen dioxide and oxygen is a first order reaction. If the half life at 55 C is 410 s, what is the value of the rate constant k? If the initial concentration of dinitrogen

asked by jen on March 11, 2009
16. ## general chemistry

. The thermal decomposition of dinitrogen pentoxide in the gas phase to give nitrogen dioxide and oxygen is a first order reaction. If the half life at 55 °C is 410 s, what is the value of the rate constant k? If the initial concentration of dinitrogen

asked by susie on October 22, 2009
17. ## u of s

A black thin-walled cylindrical can, 10.0 cm in diameter and 20.0 cm tall is filled with water at 100°C and suspended in a 20°C room. Determine the initial rate of heat transfer due to radiation, and the initial rate of change of temperature of the

asked by cz on January 27, 2013
18. ## science

A scientist is studying a chemical reaction. She predicts that after the reaction the product will have less chemical potential energy than the reactants had originally. The scientist observes the reaction, and notes that no light or sound is produced.

asked by void on March 16, 2018
19. ## AP Chemistry Help!

I had to conduct an experiment to find the enthalpy of reaction for : 4Fe + 3O2 + 6H2O ----> 4Fe(OH)3 In the experiment , I started with an inital temperature of 22.3 C and edned with 36.7 C so the delta T is +14.4C. Now it's telling me to calcualte the

asked by Jessica on November 1, 2016
20. ## Chemistry Pretest

Consider the following balanced equation. 2 H2 + O2 ---> 2 H2O Which of the following statements is false? a) One molecule of O2 will react with 2 molecules of H2 b) One mole of O2 will react with 2 moles of H2 c) The complete reaction of 32.0 g of O2 will

asked by Sarah on September 28, 2012
21. ## english

She folds some of the clothes she has already ironed, and crosses to the bed with them.” What impression do we get of the character in the above stage directions? She is bored with her current circumstances She is too busy to worry about housework She is

asked by 2phoneeeeee on January 9, 2015
22. ## (1-22)Chemistry - Science

Consider the following reaction: C(s) + H2O (g) ⇌ CO (g) + H2 (g) (Kp = 0.45 at 900 K) What is the equilibrium partial pressure of H2O when the initial partial pressure of water is 1.00 atm? a) 0.43 atm b) 0.58 atm c) 0.22 atm d) 0.52 atm e) 1.16 atm

asked by Ana on May 10, 2014
23. ## math

An object is thrown or fired straight upwards at an initial speed of v_0 ft⁄s will reach height h feet after t seconds, where h and t are related to the formula h=-16t^2-v_0 t Suppose the object is fired straight upwards with an initial speed of

asked by cris on May 25, 2014
24. ## math

An object is thrown or fired straight upwards at an initial speed of v_0 ft⁄s will reach height h feet after t seconds, where h and t are related to the formula h=-16t^2+v_0 t Suppose the object is fired straight upwards with an initial speed of

asked by cris on May 29, 2014
25. ## AP Chemistry

I am honestly lost on this question and you can't proceed without solving the first on, so if anyone would be so inclines to help me out Aluminum metal reacts with zinc(II) ion in an aqueous solution by the following half-cell reactions: Al(s) → Al3+(aq)

asked by Damien on February 12, 2018
26. ## Chemistry

What is the molar heat of reaction? When 0.732 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 119C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC.

asked by Chris on February 17, 2010
27. ## chemistry

Suppose the ÄGof, ÄHof, and ÄSo are available and valid at 298 K. Which equation(s) could be used to calculate the change in Gibbs Energy if all product and reactant concentrations (pressures) are 1 M (1 atm) and the temperature is 298 K? Choose all

asked by leighann on April 26, 2016
28. ## science

four flasks each contain 100 milliliters of aqueous solutions equal concentrations at 25 degress C and 1 atm. the four flasks are KCL,CH3OH, Ba(OH)2, and CH3COOH. the question is Which solution had the lowest freezing point and explain answer

asked by lisa on May 4, 2008
29. ## chemistry

What is the rate of disappearance of dinitrogen pentoxide between 100 s and 200 s? Is this rate higher or lower than the rate from 0 s to 100 s that you calculated in part c? As the reaction takes place, what happens to [N2O5]? In general, does a higher

asked by Anonymous on April 26, 2012
30. ## Biochemistry

You wish to make 3 reactions (1 ml each) with the specified amounts of protein. The remainder of each reaction consists entirely of buffer. The source of your protein is a stock solution that has a concentration of 0.5 mg/ml. What is the volume of stock

asked by Alwxy on October 22, 2016
31. ## chemistry

Ammonia gas can be prepared by the reaction CaO(s) + 2NH4Cl(s) -> 2NH3(g) + H2O(g) + CaCl2(s) If 112 g CaO reacts with 224 g NH4Cl, how many moles of reactants and products are there when the reaction is complete?

asked by Maria on January 20, 2011
32. ## chemistry

Q3: In the combustion reaction of 149g of propane(C3H8) with excess oxygen, what volume of carbon dioxide(CO2) is produced at STP? (note: balance the reaction first) C3H8 + O2  3CO2 + H2O

asked by b on December 8, 2013
33. ## Science

Chlorine gas was bubbled through a warm concentrated solution of potassium hydroxide. -write an equation of reaction that took place -describe how pure crystals potassium chlorate (5) may be obtained from the reaction above

asked by Piom on July 30, 2011
34. ## CHEMISTRY

Hello, I am trying to balance this redox reaction WITHOUT using the half-reaction method. Here is the unbalanced equation: MnO4 -(aq) + Zn(s)--> Mn 2+(aq) + Zn 2+(aq) It looks as if both elements are being oxidized. The answer is supposed to be: 2MnO4

asked by Vanessa on April 22, 2010
35. ## Chemistry

AgCl >Ag + Cl The silver metal that is formed causes the lenses to darken. The enthalpy change for this reaction is 3.10 102 kJ/mol. Assuming all this energy must be supplied by light, what is the maximum wavelength of light that can cause this reaction?

asked by Giznelbell on October 21, 2008
36. ## chemistry

Ammonia gas can be prepared by the reaction CaO(s) + 2NH4Cl(s) -> 2NH3(g) + H2O(g) + CaCl2(s) If 112 g CaO reacts with 224 g NH4Cl, how many moles of reactants and products are there when the reaction is complete?

asked by Jazmin on January 20, 2011
37. ## chemistry

when a 2 litre reaction vessel in which 15 grammes of pcl5 had been placed and mantained at 250 degrees celsius until equilibrium was established and found that 364grammes of cl2 remained in the vessel .find the Kc at this temperature and reaction

asked by claren nyahondo on October 10, 2018
38. ## CHEMISTRY

Consider the reaction N2+O2-->2NO with Delta H=43.2kcal. When 50.0g of N2 react with an excess of oxygen, how much heat is generated/consumed? I know that this is an endothermic reaction b/c of the + delta H, is there some sort of formula to use here? I

asked by Shaun on March 8, 2014
39. ## chemistry

Ammonia gas can be prepared by the reaction CaO(s) + 2NH4Cl(s) -> 2NH3(g) + H2O(g) + CaCl2(s) If 112 g CaO reacts with 224 g NH4Cl, how many moles of reactants and products are there when the reaction is complete?

asked by Jazmin on January 20, 2011
40. ## chemistry

The rate law is : rate = k [NO2]^2. Write an equation for the overall reaction. Identify the intermediate. Which elementary reaction is the slow one? I've been looking in my book on how to do this but I can't find how. Also, could you please explain the

asked by Kaylee on May 8, 2017
41. ## chemistry

water vapor and nitrogen dioxide gas NO2 are cimbined to manufacture ammonia. a by product of this reaction is oxygen gas. write a balanced equation for this reaction. i do not understand this at all please help me figure it out

asked by mel on April 16, 2009
42. ## Chemistry

CaCl2(aq)+ Cs3PO4(aq) ---> Complete the reaction and classify as precipitation or acid/base. Net ionic equation as well. I believe this is a precipitation reaction since there is no H. Believe the products may be CaPO4 and Cs3Cl2? Can someone help explain

asked by Meaghan on November 3, 2009
43. ## Chem

Variation of the rate constant with temperature for the first-order reaction 2N2O5(g)  2N2O5(g) + O2(g) Is given in the following table. Determine graphically the activation energy for the reaction. T(K) k(s^-1) 2981.74 x 10^-5 308 6.61 x 10^-5 318 2.51

asked by Paul on July 17, 2010
44. ## Chemistry

Write the balanced chemical reaction (showing appropriate symbols and states) for the chemical reaction with enthalpy change equal to and defined by the quantity dHformation [NH3(g)] N2(g) + 3H2(g) --> 2NH3(g) Is that all the question is asking for?

asked by AJ on March 26, 2017
45. ## Chemistry - Blue Printing Experiment

Which of the two reactions in Blue Printing is an oxidation-reduction reaction? What is the oxidizing agent and the reducing agent? Fe^3+ + C204^-2 (oxalate) -> Fe^2+ + CO3 Fe^2+ + Fe (CN)6^-2 -> Fe3[Fe(CN)6]2 Can the second reaction occur in the absence

asked by Bam on January 29, 2011
46. ## Chemistry 2

A scientist studying the reaction between decaborane (B10H18) and oxygen mixed 1.00 x 10^2 grams fo oxygen. Compute the masses of all substances present after the reaction went to completion, generating B2O3 and water as the only products.

asked by mike on February 27, 2017
47. ## chemistry

Ammonia gas can be prepared by the reaction CaO(s) + 2NH4Cl(s) -> 2NH3(g) + H2O(g) + CaCl2(s) If 112 g CaO reacts with 224 g NH4Cl, how many moles of reactants and products are there when the reaction is complete?

asked by Maria on January 20, 2011

Consider the reaction N2 + 3H2 in equilibrium with 2 NH3 . At 25°C Ho = -92.22 kJ and So = -198.53 J/K. Using this information, calculate the equilibrium constant for the reaction at 226°C. (R = 8.314 J/K) Enter your answer using TWO significant figures.

asked by Shayne on November 19, 2010
49. ## Chemistry 3A

An aqueous solution contains the ions B, C, and D that are in equilibrium with one another according to the reaction B (aq) + C (aq) ->/

asked by Sarah on July 21, 2013
50. ## Chemistry

If the rate of the reaction is 3.5 x 10-3 at 330 K, and the rate of reaction at 285 K is 5.2 x 10-5 what is the activation energy Ea in KJ/mole?

asked by Jessica on July 21, 2015
51. ## Chemsitry

Write the chemical reaction that is responsible for the pH of a buffer which contains NH3 and NH4Cl. Write the reaction in such a way that is appropriate for a Ka. Thank you!

asked by Anonymous on November 11, 2017
52. ## chem

The reaction A + B „³ C + D is second order in A and zero order in B. The value of k is 0.012 M-1 min-1. What is the rate of this reaction when [A] = 0.125 M and [B] = 0.435 M?

asked by Sarah on February 11, 2008

Briefly summarize the differences between the words or phrases in each of the following. A reaction without an enzyme and a reaction with an enzyme.

asked by Anonymous on October 3, 2009
54. ## chemistry

The reaction A + B --> C + D is second order in A and zero order in B. The value of k is 0.012 M-1 min-1. What is the rate of this reaction when [A] = 0.125 M and [B] = 0.435 M?

asked by Anonymous on February 11, 2008
55. ## chem

Write a total ionic equation for the reaction (if any) of FeCl2 with Cu, and for the reaction (if any) of FeCl2 solution with Al

asked by Stef on October 16, 2011
56. ## Biology

Hydrolysis uses a catabolic reaction. Explain what a catabolic reaction is and how it is useful in creating monomers from polymers.

asked by Kat on April 16, 2014
57. ## Biology-reaction time

How can someone improve their reaction time? also what type of athlete would have a above average reaction time? Please explain why?

asked by golnuh on January 27, 2013
58. ## Chemistry

What is the maximum mass, in grams, of NH3 that can be produced by the reaction of 1.0 g of N2 and 1.0 g of H2 using the reaction below? N2+H2→NH3 (not balanced) A) 0.60 g B) 5.7 g C) 1.2 g D) 2.9 g

asked by Katelyn on October 19, 2016
59. ## chemistry

Consider the following reaction: 2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many grams of B2O3 are made by the reaction of 233.8 g of O2

asked by michelle on November 16, 2014
60. ## Biology

Hydrolysis uses a catabolic reaction. Explain what a catabolic reaction is and how it is useful in creating monomers from polymers.

asked by Ian on May 12, 2014
61. ## Single vs double replacement reactions

How would you compare a single replacement reaction to a double replacement reaction?in laymans terms?

asked by Eric on February 26, 2014
62. ## Chemistry

The activation energy (E*) for a reaction is 195 KJ. If the k for this reaction is 3.46 x 10-5/min at 35oC, what will the temperature be in OF when k is 1.5 x 10-3/min?

asked by Jessica on July 22, 2015
63. ## Ochem

Diethyl ether is used as a solvent for the reaction of diethylamine with m-toluoyl chloride. Why is a solvent necessary for this reaction?

asked by anon on April 26, 2011
64. ## Chemistry

Assuming equal concentrations , rank these solutions by pH. RbOH(aq), NH3(aq), HF(aq) HBr(aq), Ca(OH)2(aq). I know the most acidic solution has the lowest pH and the most basic solution has the highest pH. But how am i supposed to know the pH if i don't

asked by Nia on October 17, 2011
65. ## ASAP!!!!

What foods commonly contain carboxylic acids? Why are carboxylic acids soluble (miscible) in water carboxylic acid: C6H5COOH. Sodium benzoate, the sodium salt of benzoic acid is used as a food preservative Oxalic acid containing foods The root and leaves

asked by nicole! on June 23, 2006
66. ## Chemistry

Calculate the standard entropy, ΔS°rxn, of the following reaction at 25.0 °C using the data in this table. The standard enthalpy of the reaction, ΔH°rxn, is –44.2 kJ·mol–1. C2H4(G)+H20 ---> C5H5OH ΔS°rxn= ______ J*K^-1*mol^-1 Then, calculate

67. ## AP Biology

The respiration of plants is a biochemical reaction and should have a rate determined by the Arrhenius equation, k = Ae-EA/RT. Here, k is the rate, A is a constant, EA is the activation energy for the reaction, R is the gas constant, and T is the

asked by Anonymous on December 1, 2014
68. ## Chemistry - Science (Dr. Bob222)

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 if water were produced in the gaseous rather than

asked by Ana on May 8, 2014
69. ## algebra 2B

5. Come up with a new linear function that has a slope that falls in the range −1 < m < 0 . Choose two different initial values. For this new linear function, what happens to the function’s values after many iterations? Are the function’s values

asked by deanna on June 9, 2016
70. ## physics

A copper block with a mass 1.82 kg is given an initial speed of 3.5 m/s on a rough horizontal surface. Because of friction, the block finally comes to rest. Assume that 77.4 % of the initial kinetic energy is absorbed by the block in form of heat, what is

asked by Sam on February 9, 2012
71. ## Chemistry

Dinitrogen tetroxide decomposes according to N2O4 (g) = 2NO2 (g) In a certain experiment, N2O4(g) at an initial pressure of 0.554 bar is introduced into an empty reaction container; after equilibrium is established, the total pressure is 0.770 bar. A

asked by Angel on March 19, 2012
72. ## chemistry

For the reaction, shown below, determine which statements are True and which are False. 3Fe(s) + Cr2O72-(aq) +14H+(aq) → 3Fe2+(aq) + 2Cr3+(aq) + 7H2O(l) ξo=1.77V 1. The oxidizing agent is dichromate (Cr2O72-). 2. The iron half-reaction takes place in an

asked by bekah on May 2, 2014
73. ## Chemistry

Pb(NO3)2(aq) 2 x 10-3 M Na2SO4(aq) 2 x 10-3 M Pb(NO3)2(aq) + NaSO4(aq) → PbSO4(s)+ 2NaNO3(aq) a) What are the concentrations of each ion within this solution? b) If 1L of each solution is mixed; will a precipitate form? why?

asked by Jake on May 15, 2012
74. ## Math

3. If the banks returned all the money plus interest accumulated from 1938 to 1998 it could be calculated using A=A0 (1.05)^t where A is the amount of money to be returned A0 was the initial amount and t is the number of years since 1938. (Notice that this

asked by David on April 3, 2018
75. ## Chemistry

A 1.009-g mixture of the solid salts Na2SO4 (molar mass=142.04g/mol) and Pb(NO3)2 (molar mass=331.20g/mol). The precipitate was filtered and dried, and it mass was determined to be 0.471 g. The limiting reactant was determined to be Na2SO4. a. write the

asked by Jerry on June 14, 2010
76. ## CHEMISTRY

1.Calculate the enthalpy change (ΔHºrxn) for the following reaction: (The enthalpy of formation of aqueous sodium hydroxide is -469.60 kJ/mol. The enthalpy of formation of liquid water is -285.8 kJ/mol.) 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g) 2.Do

asked by Cha-Ching on December 16, 2011
77. ## Physics

Two asteroids of equal mass collide as shown in the figure. After the collision, asteroid A’s trajectory is deflected by 30 degrees from its initial motion. Asteroid B is initially at rest and its final velocity makes a 45 degree angle with respect to

asked by GG on November 10, 2015
78. ## Chemistry

The ion-product of pure water, Kw, is 2.51 * 10(-14) at the body temp of 37 degrees Celcius. What are the molar H2O and OH concentrations in the pure water temperature?

asked by Leroy on November 19, 2014
79. ## math

in her chemistry class, Lauren must produce 300ml of an 80% acid solution. Her teacher gives her two concentrations of acid solution, a 50% and a 100%. determine how much of each concentration that she must use.

asked by garrick on September 15, 2008
80. ## Chemistry

A solution is made by mixing exactly 500 mL of 0.178 M NaOH with exactly 500 mL of 0.100 M CH3COOH. Calculate the equilibrium concentrations of H+, CH3COOH, CH3COO-, OH-, and Na+.

asked by Martina on May 2, 2011
81. ## chemistry

I need help in the formula to calculate these types of problems 125ml of 0.43M of HCl + 17ml of 1.8M HCl Calculate the concentrations of solutions resulting from the mixture

asked by michelle on February 5, 2016
82. ## AP Chemistry

A solution is made by mixing exactly 500 mL of 0.167 M NaOH with exactly 500 mL of 0.100 M CH3COOH. Calculate the equilibrium concentrations of H+, CH3COOH, CH3COO-, OH-, and Na+.

asked by Allison on February 16, 2014
83. ## Chemistry

A solution is made by mixing 5.00 × 102 mL of 0.167 M NaOH with 5.00 × 102 mL of 0.100 M CH3COOH. Calculate the equilibrium concentrations of H+, CH3COOH, CH3COO−, OH−, and Na+.

asked by Sandhya on March 20, 2015
84. ## chemistry

a mixture of 0.500 mol H2 and 0.500 mol I2 was placed in a 2.00-L stainless-steel flask at 430C. Calculate the concentrations of H2, I2, and HI at equilibrium

asked by tammie on February 14, 2012
85. ## physics

A body moves in a straight line with initial velocity and uniform acceleration. Find how far it travels in 12s, giving that it travels 246m in the first 6seconds and 69m in the last 3seconds. Find also the initial velocity.

asked by skenge on February 15, 2013
86. ## science

A ball is thrown from a height of 10m with certain initial downward velocity. It hits the ground and loses 50% of its energy during the impact and rises back to the sane height. What was its initial downward velocity of projection?

asked by Tara psd on May 19, 2017
87. ## Physics

A shell is fired from the ground with an initial speed of 1.72 103 m/s at an initial angle of 40° to the horizontal. a) Neglecting air resistance find the horizontal range b) Find the amount of time the shell is in motion

asked by Jacob on November 14, 2012
88. ## physics

A bullet is fired at an initial velocity of 300 m/s from the top of a cliff 150 m high. Find the initial horizontal and vertical components, horizontal and vertical displacement, displacement upon reaching the ground.

asked by ellah on January 9, 2012
89. ## phy

a rubber ball is thrown against a horizontal wall and bounces back with the same speed it came in at. The change in momentum vector of the ball is A) 10 m/s^2 B) in the same directions the ball's initial motion C) in the opposite direction as the ball's

asked by carol on November 4, 2016
90. ## Physics

a quaterback throws a ball to a stationary reciver wo is 15.2m down the feild. the football is thrown at an initial angle of 42 dagrees. acceleration is 9.81m/s^2. what is the initial speed that quaterback must throw the ball to hit the reciver?

asked by Sierra on October 23, 2012
91. ## Physics

A ball is fired from the ground with an initial speed of 2.38 * 10^3 m/s (approximately seven times the speed of sound) at an initial angle of 56.0° to the horizontal. Neglect air resistance. (a) Find the ball's horizontal range.(m)

asked by Michelle on October 21, 2012
92. ## chemistry

Which of the following experimental conditions describe a reaction which is kinetically controlled? These conditions do not describe kinetic control. ΔG = -100 kJ/molrxn; there is no observable reaction when reactants are mixed. ΔG = +100 kJ/molrxn;

asked by anonymous on May 18, 2010
93. ## Burnhamthrop Chemistry

initially 0.25 mol of water vapour and 0.20 mor of carbon monoxide are place in a 1.00 L reaction vessel. at equilibrium spectroscopic evidence shows that 0.10 mol of corbon dioxide is present calculate K for the reaction

asked by Omar on October 31, 2015
94. ## Chem

At 25°C the following heats of reaction are known: 2C2H2 + 5O2 ---> 4CO2 + 2H2O; ΔH = -2600 kJ C + O2 ---> CO2 ; ΔH = -394 kJ 2H2 + O2 ---> 2H2O; ΔH = -572 kJ At the same temperature, calculate ΔH for the following reaction: 2C + H2 ---> C2H2; ΔH =

asked by Kaitie on February 21, 2017
95. ## chemistry........help!! =)

MaVa = MbVb can be used for the reaction between HCl and NaOH. Can it be used for the reaction between NaOH and H2C2O4 (oxalic acid, which can be found in rhubarb leaves, contains 2 acidic protons)? Explain your answer showing the balanced equation

asked by Stacy on November 17, 2010
96. ## chemistry

For the reaction A to products}, the following data were obtained: t=0 s, A}]=0.715 M; 22 s, 0.605 M; 74 s, 0.345 M; 132 s, 0.055 M. What is the half-life of the reaction? ive been posting this for awhile now...can someone just show me how to go about

asked by joe on February 28, 2010
97. ## Chemistry

Methane gas reacts with diatomic sulfur in the gas phase, producing carbon disulphide and hydrogen sulfide. The rate constant for this reaction is 1.1 (L/M.s) at 550 oC. If it is 6.31 (L/M.s) at 624 oC, what is the value of the activation energy for this

asked by MK on October 9, 2012
98. ## Chemistry help

Sulfur trioxide is formed by the catalytic oxidation of sulfur dioxide: 2SO2(g)+O2(g)→2SO3(g) If ΔH∘= -197.8kJ/mol and ΔS∘= -188.0J/K , what is ΔStotal for this reaction? Is the reaction spontaneous under standard-state conditions at 25 ∘C?

asked by Emily on April 2, 2014
99. ## Chem II

Kp for the reaction CaCO3 CaO + CO2 at 350 degrees C is 0.105. Kc for the reaction at the same temp is _____. This is what I did. I changed all the moles into M. Then I subbed everything into the Kc formula and then changed it into a quadratic. Then

asked by Ken on June 25, 2008
100. ## Chemistry

The Hydrolysis Reactions - Write net-ionic equations for the reaction of each salt with water below. If there is no reaction, write N.R. 1. NH4C2H3O2 2. NH4Cl 3. NaCl 4. Na2CO3 5. NaC2H3O2 6. NaHSO4 7. FeCl3 8. NaH2PO4 9. NaHCO3

asked by K on April 30, 2011