a certain reaction has the following generaln form

72,877 results, page 54

chemistry

I got E) for the first and couldn't figure out the other one. Can any one verify the first and help with the second?? In which of the following processes is there a decrease in the potential energy of the substances involved? A) a coil spring is compressed B) two particles of ...

8th grade English/Language Arts

1.)Why does the author of “Always to Remember” discuss Maya Ying Lin’s background? a.)to show that she experienced hardships b.)to appeal to Chinese-American readers c.)to show its influence on her design d.)to show her disinterest in architecture 2.) Which of the ...

Chemistry

A total of 2.00 mol of a compound is allowed to react in a foam coffee cup that contains 141 g of water. The reaction caused the temperature of the water to rise from 21.0 to 24.7 degrees Celsius. What is the enthalpy of this reaction? Assume that no heat is lost to the ...

college chemistry

The voltaic cell described by the balanced chemical reaction has a standard emf of 4.05 V. Calculate the equilibrium constant (Kc) for the reaction at 25 oC. Round your answer to 3 significant figures. F2(g) + Mn(s) → 2F-(aq) + Mn2+(aq) Mn2+/Mn -1.18 F2/F- +2.87 0 °C = ...

Chemistry

Consider the chemical reaction C + H2O -----> CO + H2 How many liters of hydrogen gas are formed From the complete reaction of 1.07 mol of C? Assume that the hydrogen gas is collected at a pressure of 1.0 atm and the temperature of 315K So I'm looking for volume and I have ...

ukm

The equilibrium constant (Kc) for the gas phase reaction 2 NH3 --> N2 + 3 H2 is 3 x 10-3 at some temperature. The reaction is started by placing a sample of ammonia in an empty one liter flask. When equilibrium is established there is 0.010 mole of N2 present. How much ...

biology

On a hot, summer day, what would most likely be the limiting factor, the light reaction, or the dark reaction (in terms of photosynthesis)? I don't necessarily need the question answered. Rather, I don't quite understand how limiting factors, light and dark reactions work.

Chemistry

Consider the reaction 2 SO2(g) + O2(g) in equilibrium with 2 SO3(g) . At 25°C delta H° = -197.78 kJ and delta S° = -187.95 J/K. Using this information, calculate the equilibrium constant for the reaction at -32°C. (R = 8.314 J/K) Enter your answer using TWO significant ...

Chemistry

A reaction requires 0.5 g of pure methyl oleate (density = 0.87g/mL) (MW = 310g/mol). How many mL of 70% pure methyl oleate are needed for the reaction. I don't exactly know how to start this off. I think what I'm supposed to do is multiply the 70% by the molecular weight and ...

Math

1. Use point-slope form to write the equation of a line that has a slope of 2/3 and passed through (-3,-1). Write your final equation in slope-intercept form. Is the answer y=2/3+-1 2. Write an equation of the line that passed through (2,-1) and is parallel to the graph of y= ...

Chemistry

Use the balanced equation to answer the following: 3AgNO3(aq) + FeCl3(aq)...Fe(NO3)3(aq) + 3AgCl(s) If 21.73g of FeCl3 is mixed with 48.97g of AgNO3 a) Which is the limiting reagent? b) How many grams of AgCl can be theoretically produced? c) If 15.97g of AgCl was collected, ...

Chemistry

Determine the direction of the following reaction from the relative strengths of acids and bases: H2S(aq) + C2H3O2-(aq) yields Hc2H3O2(aq) + HS-(aq) The book says this will favor the reactants. I'm confused...shouldn't this be neutral because both reactants and products have ...

chemistry

My teacher went over it really fast and now I'm just really confused about how to do my homework =( Calculate the cell potential for the following reaction as written at 25C, given that [Cr2+] = 0.821 M and [Ni2+] = 0.0190 M. Cr(s) + Ni2+ (aq) <==>Cr2+ (aq) + Ni(s) Thank...

Chemistry

a. Write and balance the equation for the reaction of calcium carbonate with hydrochloric acid, then answer the following questions. b. What mass of calcium carbonate is required to neutralize 83.5mL of 6.00M HCl? does the balanced equation have any significance in this ...

Chem

COMPOUND 1 CH2 = CH-CH-OH with CH3 under the second CH Plus CH3-CH-CH2-C (double bond O off C and -OH off C) also a CH3 under CH i) complete the equation for this reaction ii) Indentify any new functional groups in the organic product(s)name them iii)State the type of reaction...

AP Chemistry

This is the question I am having trouble with: A voltaic cell consists of a strip of lead metal in a solution of Pb(NO3)2 in one beaker, and in the other beaker a platinum electrode is immersed in a NaCl solution, with Cl2 gas bubbled around the electrode. A salt bridge ...

algebra 1

a line passes through the point (3, -5) and has a slope of 7. which of the following is the correct point- slope form of the equation of the line and why? a.y+5= 7(x-3) b. y-5= 7(x+3) c. y+5= 7(x+3) d. y-5= 7(x-3)

math

Write the following number in standard form: 400,000,000+30,000,000,+1,000,000+200,000+5,000+600+1

AP Chem

the activation energy for the reaction H2+I2 >>2HI is 167kJ/mol, and deltaE for the reaction is +28kJ/mol. What is the activation energy for the decompistion of HI?

Chemistry

Ni2+(aq)+Mg(s)→Ni(s)+Mg2+(aq) Indicate the half-reaction occurring at Anode. Indicate the half-reaction occurring at Cathode.

Organic Chemistry

Ooops sorry! Please rank the following compounds in DECREASING order of their reactivity toward the SN2 reaction with sodium ethoxide in ethanol. a. methyl chloride b. isopropylbromide c. t-butyliodide d. methyl iodide e. ethyl chloride I have an answer, I'm just not sure if ...

chemistry

3. A carbonate fusion was needed to free the Bi from a 0.6423-g sample of eulytite (2Bi2O3·3SiO2). The fused mass was dissolved in dilute acid, following which the Bi+3 was titrated with 27.36mL of 0.03369M NaH2PO4. The reaction is Bi+3 + H2PO4-  BiPO4(s) + 2H+. Calculate ...

chemistry

A particular reaction has an activation energy of 51.6 kJ/mol-rxn. How much faster is the reaction at 50 degrees C versus 25 degrees C? a. 2 times b. 5 times c. 3 times d. half as fast d. 20% as fast help

math

Write an equation that has a slope of -2/3 in Point-slope form and Slope-intercept form.

maths

in a certain code "7 8 6" means "bring me apple" , "9 5 8" means "peel green apple" and "6 4 5" means "bring green fruit", which of the following is the code for 'me'?

chem!

Calculate the heat of reaction for the incomplete combustion of 67.0g propane producing carbon monoxide gas and water vapour. how would I go about and do this question? What are you studying? Do you know how to use the thermodynamic tables (delta Ho, etc). delta Hrxn = delta H...

spanish

Choose the correct singular form of “las universidades.” Choose the correct singular form of “los señores.” Choose the correct singular form of “ las mochillas.”

math

1. Divide. Write your answer in simplest form. 2/3 / 1/4 2. Find the product. 1/2 x 3/7 3. Divide. Write the quotient in simplest form. 3/5 / 2/10 4. Divide. Write the quotient in simplest form. 3/4 / 4/5 plz help me

chemistry

what are some the different types of chemical reactions that occur on a daily basis our lives? wouldnt there be many? eating, taking medications, would emotion be or cause chemical reaction? All of the above. Add breathing. Don't forget the cars we drive, the clothes we wear. ...

thermodynamics

A reaction has deltaHrxn=-127 kJ and delta S rxn=314 J/K. At what temperature is the change in entropy for the reaction equal to the change in entropy for the surroundings? so I made delta H-T delta S=0 plugged in values for S and H and solved for T. I got -404.5 degrees K. Is...

chemistry

A particular reaction has an activation energy of 51.6 kJ/mol-rxn. How much faster is the reaction at 50 degrees C versus 25 degrees C? a. 2 times b. 5 times c. 3 times d. half as fast d. 20% as fast think it has something to do with the Arrhenius equation but i have no idea ...

chem- i reallyneed help

Consider the following equations. N2H4(l) + O2(g) N2(g) + 2 H2O(l) ÄH = -622.2 kJ H2(g) + 1/2 O2(g) H2O(l) ÄH = -258.5 kJ H2(g) + O2(g) H2O2(l) ÄH = -187.8 kJ Use this information to calculate the enthalpy change for the reaction shown below. N2H4(l) + 2 H2O2(l) N2(g) + 4 ...

Chemistry 30

A mixture of 2.5 moles of H2O and 100 g of C are placed in a 50.0 L container and allowed to come to equilibrium in the following reaction: C(s) + H2O(g)  CO(g) + H2(g) The equilibrium concentration of hydrogen gas is found to be 0.040 M. What is the ...

Chem

A mixture of 2.5 moles of H2O and 100 g of C are placed in a 50.0 L container and allowed to come to equilibrium in the following reaction: C(s) + H2O(g)  CO(g) + H2(g) The equilibrium concentration of hydrogen gas is found to be 0.040 M. What is the ...

Chemistry 2

The equilibrium constant, Kc, for the following reaction is 1.54E-2 at 643 K. 2HI(g) H2(g) + I2(g) When a sufficiently large sample of HI(g) is introduced into an evacuated vessel at 643 K, the equilibrium concentration of I2(g) is found to be 0.351 M. Calculate the ...

Chem

Suppose that a stable element with atomic number 119, symbol Wr, has been discovered. (d) What would be the most likely charge of the Wr ion in stable ionic compounds? (e) Write a balanced equation that would represent the reaction of Wr with water. (f) Assume that Wr reacts ...

Chemistry

OK I just need help with two final problems that I am stuck on: The problem states the calcium carbonate in limestone reacts with HCl to produce a calcium chloride solution and carbon dioxide gas CaCO3(s)+2HCl(aq)-->CaCl2(aq)+H2O(l)+CO2(g) 1)Find how many moles of CO2 form ...

english

so to craete a narrative poem in the anglo saxon style of beowulf is to copy the same theme but in your own words and your own characters.i think i got it.but do i write it in a essay form or story form or poem.

Child day care

One example of a form that would be created for staff at a child care center is a/an A. enrollment application. B. billing notice. C. diaper check record. D. fingerprint form. My answer is D, but I'm not sure.

Chemistry

The reaction of a metal ion, M^2+, with EDTA is given in the following equation: M^2+(aq) + Y^4-(aq) <==> MY^2-(aq) The EDTA was standardized with a 0.04 M Zn^2+ solution. 25.05 mL of EDTA solution was used to titrate the Zn^2+ solution. From this standardization, ...

Chemistry

the following acid—base neutralization reaction HNO3 (aq)+ KOH (aq) --KNO3(aq) + H2O (I) What is the molarity (M) of an HNO3 solution if 50.0ml is needed to react with 25.0ml of 0.150M KOH solution?

Chemistry

NaOH + HS0-+ Hp + NaS0 24 24 Which of the following is the number of moles of NaOH required to neutralize 1 mole of H2S04 in the equation above? (Note: The reaction is not balanced.) A. 0.5 moles B. 1 mole C. 1.5 moles D. 2 moles 1

Chemistry

The Haber process developed to produce fertilizer from nitrogen and hydrogen, is governed by the following unbalanced reaction: a N2 + b H2 -> c NH3 . If 10.5 kg of NH3 product is required, how many kg of hydrogen are required if nitrogen is in excess?

9th grade chem

Using the following equation Ca(s) + 2C(s) --> CaC2(s) ^ H = -62.8 kJ CO2(g) --> C(s) + O2(g) ^ H = 393.5 kJ CaCO3(s) + CO2 (g) --> CaC2(s) + 2 1/2O2(g) ^ H = 1538 kJ Determine the heat of the reaction (in kJ) for: Ca(s) + C(s) + 3/2O2(g) --> CaCO3(s)

chem

An equilibrium mixture of the following reaction was found to have [COF2] = 0.255 M and [CF4] = 0.118 M at 1000°C. What is the concentration of CO2? 2 COF2(g) CO2(g) + CF4(g) Keq = 2.00 at 1000°C Thanks:)

chemistry

se the information provided to determine ΔH°rxn for the following reaction: ΔH°f (kJ/mol) 3 Fe2O3(s) + CO(g) → 2 Fe3O4(s) + CO2(g) ΔH°rxn = ? Fe2O3(s) -824 Fe3O4(s) -1118 CO(g) -111 CO2(g) -394

alerbra

32/100 write in decimal form 32/100 write in reduce fraction form divide 44 into 16.5

Algebra Help

Let x = log_2 1/8 Write the exponential form of the equation and solve the equation for x. Does this work? Thanks! Exponential form is 2^-3=1/8 To Check: 2^-3=1/2^3=1/8

alebra

write the vertex form of a parabola that satisfies the conditions given. Then write the equation in the form y=a^+bx+c. vertex (-3,-4) and a=5.

Math

give examples of a rational number in fraction form. Write your rational number in its decimal form.

Enlgish, possessive form of singular and plural no

possessive form of family, brother, suitcase, child, government, pen, train, tree, woman, refugg, families, brothers, suitcases, children, governments, pens, trains, trees, women,refugees

English

what is a good thesis statement that I can form out of this prompt for A Raisin In The Sun choose one of the following characters. identify and analyze the character's primary internal conflict and external conflict and how each is resolved . I choose Walter Lee Younger.

chemistry

Aqueous solutions of iron (III) sulphate and barium hydroxide are combined. Does a precipitate form? If yes write a net ionic equation for the precipitation reaction. You first identify the formula of the aqueous compounds (note that iron is said to be iron(III)), and use it ...

chemistry

The electrochemical cell described by the balanced chemical reaction has a standard emf (electromotive force) of 0.27 V. Calculate the equilibrium constant (Kc) for the reaction at 298 K. Round your answer to 3 significant figures. H2O2(aq) + 2ClO2(g) → O2(g) + 2HClO2(aq...

Inorganic Chemistry

In a constant-pressure calorimeter, 70.0 mL of 0.340 M Ba(OH)2 was added to 70.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 22.00 °C to 26.63 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4.184 J/g...

Inorganic Chemistry

In a constant-pressure calorimeter, 70.0 mL of 0.340 M Ba(OH)2 was added to 70.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 22.00 °C to 26.63 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4.184 J/g...

Algebra

I'm working midpoints, distance, circles and standard form and general form. I have some questions with my answers to the first two-I'm stuck on #3 1. What is the distance between points (0,0) and (-3,5) My answer: sqrt34 2.What is distance between (3,1) and (10,8) My answer ...

chemistry

Copper reacts with sulfuric acid according to the following equation: 2H3SO4 + Cu-> CuSO4 + 2H2O + SO2 How many grams of sulfur dioxide are created by this reaction if 14.2 g of copper reacts with 18 g of sulfuric acid?

chemistry

Copper reacts with sulfuric acid according to the following equation: 2H3SO4 + Cu-> CuSO4 + 2H2O + SO2 How many grams of sulfur dioxide are created by this reaction if 14.2 g of copper reacts with 18 g of sulfuric acid?

chemistry

Copper reacts with sulfuric acid according to the following equation: 2H3SO4 + Cu-> CuSO4 + 2H2O + SO2 How many grams of sulfur dioxide are created by this reaction if 14.2 g of copper reacts with 18 g of sulfuric acid?

Chemistry

Given the following data, determine the rate constant of the reaction 2NO(g) + Cl2(g) 2NOCl(g) Experiment [NO] (M) [Cl2] (M) Rate (M/s) 1 0.0300 0.0100 3.4 x 10–4 2 0.0150 0.0100 8.5 x 10–5 3 0.0150 0.0400 3.4 x 10–4 a. 1.13 M –2s–1 b. 9.44 M –2s–1 c. 37.8 M –...

chemistry

For the reaction: A + 3B = 4C Which of the following provides the direct link between the amount of reactant A and the amount of product C? -coefficients in the equation -molar mass of C -the reactant B or -molar mass of A?

CHEMISTRY

For the following reaction at equilibrium, indicate if the equilibrium mixture contains mostly products, mostly reactants, or both products and reactants. 2H20(g)-><-2H2(g)+O2(g) kc+4x10-48

Chemistry

Assign oxidation numbers to each individual element in the following reaction and identify the oxidizing and reducing agents. 2 Zn S + 3 O2 -> 2 S O2 + 2 Zn O Ox#: Zn=+2 S=-2 O=-2 -> S=+2 O=-2 Zn=+2 O=2 Is that correct? I'm not sure how to identify the oxidizing and ...

Chemistry

C2H2(g) + 2 H2(g)--> C2H6(g) Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g 200.9 226.7 H2(g) 130.7 0 C2H6(g) -- -84.7 Bond Bond Energy (kJ/mol) C-C 347 C=C 611 C-H 414 H-H 436 If the value of the standard entropy change, ∆Sº for the reaction is -232.7 ...

Chemistry

C2H2(g) + 2 H2(g)--> C2H6(g) Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g 200.9 226.7 H2(g) 130.7 0 C2H6(g) -- -84.7 Bond Bond Energy (kJ/mol) C-C 347 C=C 611 C-H 414 H-H 436 If the value of the standard entropy change, ∆Sº for the reaction is -232.7 ...

chemistry

C2H2(g) + 2 H2(g)--> C2H6(g) Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g 200.9 226.7 H2(g) 130.7 0 C2H6(g) -- -84.7 Bond Bond Energy (kJ/mol) C-C 347 C=C 611 C-H 414 H-H 436 If the value of the standard entropy change, ∆Sº for the reaction is -232.7 ...

Chemistry

How many joules are required to raise the temperature of 450mL of water from 30 °C to 100 °C? The specific heat of copper metal is 0.385 J/ g- K. How many KJ of heat needed to raise the temperature of 1.1 kg block of copper from 27.5 C to 50 C? If 200 J of heats is added to ...

Mental Health Diagnosis and assessment

Greetings, I am having doubts about the following answers I selected. Can anyone help me? Certain behaviors, such as gambling, are often described as compulsive. Such behaviors differ from the compulsions associated with obsessive-compulsive disorder; because, the person ...

chemistry

What are the names of Calcium in its ionic form the relationship of that element, in its ionic form, with our health? I understand calcium chloride is ionic form of calcium but the others what are others that have a relationship with our health?

chem plz help!

the rate of a nuclear reaction can be changed by?? i know adding a catalyst to a normal reaction can but to a nuclear im not sure. increasing temp decreasing pressure adding a catalyst none I suppose it all depends upon how you define a catalyst. Perhaps in a small way ...

college chemistry

In the derivation of this expression: [ln]/[HIn]A# 2 * A#1,acid/A# 2,basic * A#1 We assumed that the HIn form of the indicator is the only form present in the most acidic solution. Is this a valid assumption? Why or why not? Support your answer by determining the ...

Chemistry 400/ Chem 1A

A chemist mixes 5.216 g of potassium permanganate, 2.318 g of ethanol, and excess sulfuric acid. These chemicals react as follows: 4 KMnO4 + 5 C2H5OH + 6 H2SO4 ---> 4 MnSO4 + 5 CH3COOH + 2 K2SO4 + 11 H20 What mass of sulfuric acid is consumed in this reaction, assuming that...

chemistry

What is the theoretical yield of H[2]O (in grams) if 8.3 mol H[2]S were consumed in the above reaction? If 137.1g of water was actually collected after the reaction, what is the percent yield? I have no idea to do this problem. I am not good in math at all and currently taking...

Math

I need to express the following in equivalent form: m-2/m^2-5m+6 , 2x+6/x^2-6x-27 , a^2+a/a^2+2a+1 , 2w+1/2w^2+2w+1 , 8Z+6Z^2/9z^2-16 I really don't understand how I can do this if the denominator is smaller and I just don't see how I can simplify since I think that's what it'...

physics

please check Which of the following is NOT a characteristic of electrical potential energy? a. it is a form of mechanical energy b. it results from a single charge c. it results from the interaction between charges d. it si associated with a charge in an electric field A

Insurance form preparation

Which of the following documents would provide information on a patient's diagnosis? A. Confidential patient information record b. ledger sheet c.medical treatment record d. CPT-4 Tossed up on answer

science

Which of the following pairs of elements are likely to form ionic compounds: A) helium and oxygen B) magnesium and chlorine C) chlorine and bromine D) potassium and sulfur E) sodium and potassium F) nitrogen and oxygen I believe the answer is d and f

Chemsitry

I don’t understand how to write this equation. Write an equation relating the concentration for a reactant A at t=0 to that at t=t for a first-order reaction. Define all the terms, and give their units. Do the same for a second- order reaction. -Would it be the rate law ...

Chemistry

I'm reviewing for a test and I'm on Le Chatelier's principle. Decreasing the temperature of an exothermic reaction shifts the equilibrium to the right? I understood this weeks ago but now I can't remember. Wouldn't decreasing the temperature cause there to be less collisions ...

Chemistry

A certain Geiger counter is known to respond to only 1 of every 1000 radiation events from a sample. Calculate the activity of each radioactive source in curies, given the following data. My text barely attempts to explain how to do this problem, and there is no example. I am ...

Chemistry

In the derivation of this expression: [ln]/[HIn]A# 2 * A#1,acid/A# 2,basic * A#1 We assumed that the HIn form of the indicator is the only form present in the most acidic solution. Is this a valid assumption? Why or why not? Support your answer by determining the ...

organic chemistry

Michael & Aldol Condensation Reaction We are preparing an a,b-unsaturated ketone via Michael and aldol condensation reactions. The reactants are trans-chalcone and ethyl acetoacetate (in ethanol and NaOH). This creates 6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone. What I'm ...

organic chemistry

Michael & Aldol Condensation Reaction We are preparing an a,b-unsaturated ketone via Michael and aldol condensation reactions. The reactants are trans-chalcone and ethyl acetoacetate (in ethanol and NaOH). This creates 6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone. What I'm ...

organic chemistry

Michael & Aldol Condensation Reaction We are preparing an a,b-unsaturated ketone via Michael and aldol condensation reactions. The reactants are trans-chalcone and ethyl acetoacetate (in ethanol and NaOH). This creates 6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone. What I'm ...

Chemistry

500.0 mL of 0.220 mol/L HCl(aq) was added to a high quality insulated calorimeter containing 500.0mL of 0.200 mol/L NaOH(aq).Both solutions had a density of 1g/mL & a specific heat of 4.184 J/g.K.The calorimeter had a heat capacity of 850 J/C.Temperature of entire system rose ...

Chemistry

A mixture of ammonia and oxygen is prepared by combining 0.330 L of NH3 (measured at 0.790 atm and 22°C) with 0.210 L of O2 (measured at 0.820 atm and 48°C). How many milliliters of N2 (measured at 0.740 atm and 100. °C) could be formed if the following reaction occurs? ...

Chemistry

Find the equilibrium constant for the following reaction: D-Glucose (aq) <-> 2L (+) lactic acid (aq) ΔG ° for D-Glucose= -914.5kJ/mol ΔG ° for lactic acid = -538.8kJ/mol Would I just use the ΔG° =-RTlnK?

Chemistry

The combustion of propane (C3H8) in your BBQ occurs by the following unbalanced reaction: C3H8(g) + O2(g)  CO2(g) + H2O(g) If 34.0 mL of CO2(g) is collected, what volume of H2O(g) also could be collected under the same conditions?

Chemistry

Calcium carbonate reacts with HCl according to the following equation: 2HCl(aq)+CaCO3(s)→CaCl2(aq)+H2O(l)+CO2(g) How many moles of HCl are in 58 mL of 0.13 M HCl? What mass of calcium carbonate is needed for complete reaction with the HCl in (a)?

organic chemistry

Instead of using 1-propanol or 2-pentanol, a student decided to conduct the same reaction (using Sodium Bromide and Sulfuric Acid) you did starting with 2,4-dimethyl-3-pentanol instead. What product(s) would you predict for this reaction? Show a mechanism to account for any ...

chemistry

When 0.949 g of CaO is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 389C 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. what is molar heat of reaction, Hrxn, for the reaction of CaO...

physics

A ranger in a national park is driving along at 17.9 m/s when a deer jumps into the road 65. m ahead of the vehicle. After a reaction time of t seconds, the ranger applies her brakes, which produce an acceleration of -2.8 m/s2. What is the maximum reaction time she can have if...

Chemistry

Oxy acetylene welding uses acetylene gas which is produced by the reaction of CaC2 with water. It also produces calcium hydroxide as a by product.Calculate the volume in liters measured at 27°C and 965 torr that would be produced from the complete reaction of 11.2 g of CaC2 ...

chemistry

5. The tetraethyl lead [Pb(C2H5)4] in a 25.00-mL sample of aviation gasoline was shaken with 15.00mL of 0.02095M I2. The reaction is: Pb(C2H5)4 + I2  Pb(C2H5)3I + C2H5I. After the reaction was complete, the unused I2 was titrated with 6.09mL of 0.03465M Na2S2O3. Calculate ...

biology

using lactose and a ph value of 3,5,7,9,11, Why was there no increase in the reaction rate with 8.0 g. of substrate as compared to 4.0 g. of substrate? What would you need to add to see an increase in the reaction rate with 8.0 g. of substrate?

Math. PLEASE HELP!

1. What is the sum? 7 over 3+ -3 over 8 A. 65/24 B. 47/24 C. -4/5 D. -5/4 2. What is the difference? 9 over 5 - 1 over 6 A. 49/30 B. -8/1 C. 59/30 D. -1/8 3. What is the simplified form of the following expression? 4 over 7^3 A. 343/64 B. 21,952 C. 407 D. 64/343 My answers: 1...

Chemistry

Hi I have two questions and I was hoping someone could help me with them. 1. Classify the following compounds as ionic or covalent a. MgCl2 b. Na2S c. H2O d. H2S 2. Which compound in each pair exhibits the stronger intermolecular hydrogen bonding? a. H2S vs. H2O b. HCl vs. HF ...

CHEMISTRY

THIS IS THE 3RD TIME POSTING THIS, PLEASE HELP ME ANSWER THIS THE HOMEWORK IS DUE TONIGHT. Write formulas for the compounds that form from In (Assume In charge is 3+.) and each of the following polyatomic ion: NO−3, SO2−4, PO3−4 -3, -4, -4 ARE THE CHARGES. ...

Chemistry

home / study / science / chemistry / questions and answers / a subtilisin with an active site mutation of his ... Question: A subtilisin with an active site mutation of His t... EDIT QUESTION A subtilisin with an active site mutation of His to Ala had a substantially decreased...

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  53. 53
  54. 54
  55. 55
  56. 56
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  61. 61
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  64. 64
  65. 65
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  100. 100