a certain reaction has the following generaln form

72,211 results, page 78

Chemistry

The standard free energy of activation of one reaction is 94.3 kj/mol^-1 (22.54 kcal/mol^-1). The standard free energy of activation for another reaction is 76.4 kJ/mol^-1 (18.26 kcal/mol^-1). Assume temp of 298K and 1 M conc. By what factor is one faster than the other? Im ...

Jefferson

Nitric acid and zinc react to form zinc nitrate, ammonium nitrate, and water. 4Zn(s) + 10HNO3(aq)→ 4Zn(NO3)2(aq) + NH4NO3(aq) + 3H2O(l) A. How many atoms of zinc react with 1.49g HNO3? B. Calculate the number of grams of zinc that must react with an excess of HNO3 to ...

chemistry

Nitric acid and zinc react to form zinc nitrate, ammonium nitrate, and water. 4Zn(s) + 10HNO3(aq) → 4Zn(NO3)2(aq) + NH4NO3(aq) + 3H2O(l) A. How many atoms of zinc react with 1.49g HNO3? B. Calculate the number of grams of zinc that must react with an excess of HNO3 to ...

marketing

Can someone please help me with this? I really just do not know where to start researching for the answer, where are some good places to look? Develop a research proposal in the form of a PowerPoint presentation of 8–15 slides. Your proposal should outline and provide ...

social studies

A democracy may be defines by the political principal that the government is created by,derives it's powers from,and exists to serve the people. According to this statement,which of the following is inconsistent with a democratic form of government? (1) The citizens of a ...

health

Is there anyone that could possibly help me understand medical terminology? My college course has transitioned to an all online setting with in-class closed book exams. I'm having a hard time understanding the difference in word roots and combining forms. For instance: she ...

Chemistry

I really need help with this I am really confused with the law, I have looked at multiple examples and I am still so confused, I know you can't give me the answer, but is there anyway you could please take me through this question step by step? Use Hess's law and changes in ...

Math

(a) translate the argument into symbolic form and (b) determine if the argument is valid or invalid. You may compare the argument to a standard form or use a truth table. If I can get my child to preschool by 9:45AM, then I can take the 9:00AM class. If I can take the 9AM ...

Chem -plz check work

so i've worked on this some more, now I am asking if someone will plz check my work 2 half cells in a galvanic cell consist of one iron Fe(s) electorde in a solution of iron (II) sulphate FeSO4(aq)and a silver Ag(s) electrode in a silver nitrate solution, a)state the oxidation...

chemistry

Why doesn't potassium ion K+ from KMnO4 appear in the following two unbalanced equations: MnO4– + C2O42– Mn2+ + CO2 MnO4– + Fe2+ Mn2+ + Fe3+ ? A. KMnO4 is not added to either reaction. B. The presence of K+ would result in a net positive charge in the products. C. K+ is ...

chemistry

Why doesn't potassium ion K+ from KMnO4 appear in the following two unbalanced equations: MnO4– + C2O42– Mn2+ + CO2 MnO4– + Fe2+ Mn2+ + Fe3+ ? A. The presence of K+ would result in a net positive charge in the products. B. The equations cannot be balanced if the ...

Chemistry

Why doesn't potassium ion K+ from KMnO4 appear in the following two unbalanced equations: MnO4– + C2O42– Mn2+ + CO2 MnO4– + Fe2+ Mn2+ + Fe3+ ? A. KMnO4 is not added to either reaction. B. K+ is a spectator ion and redox reactions are written as net ionic reactions. C. ...

finance

pro forma financial statements are a. the most comprehensive means of financial forecasting b. often required by prospective creditors Thank you for using the Jiskha Homework Help Forum. Here is a definition of Pro Forma Financial Statements: Definition Financial statements as...

Science / Biology

How does modern science explain the evolution of abiotic to biotic matter? How would the first life form have survived in the first day / week of its formation? What kind of system of organelles / biological functions would it have to form in the first day / week of it's ...

ela

The poems are concrete cat haiku and limerick in the poems you read in collection 3 the poets choose different forms to express their thoughts and feelings about the subject. Imagine That there poetic forms changed. How would each poem be different if its form were exchanged ...

Physics

Consider the series RLC circuit in which R2<4L/C (underdamped). Assume that at t=0 , the charge on the capacitor has its maximum value. The differential equation obeyed by the potential across the capacitor can be written in the following form d2V/dt2+a*dV/dt+b*V=0 In the ...

DrBob222 PLEASE HELP!

I posted this question already but you never replied back :( Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer...

MATH

How do I write one equations in slope-intercept form, and three other lines in slope-intercept form that are perpendicular to the first line ?? for ex. If I pick the equation y=2/3x+4 for the first equation. and for the second line , the slope -2/3x +4 , how about the 3rd and ...

Biology

The maltose molecule can be broken down into two individual glucose molecules with the help of an enzyme produced within a cell. Which of the following changes is most likely to slow down this reaction? Adding more maltose molecules Increasing the volume of the cell Adding ...

chemistry

Hess¡¯ law says that when we add reactions together we can also add the enthalpies. Given the following set of reactions, use Hess¡¯ Law to calculate the enthalpy of the reaction given below. N2H4 + H2 ¡æ 2 NH3 ¥ÄH¡Æ = ? N2 + 3 H2 ¡æ 2 NH3 ¥ÄH¡Æ = -92.38 kJ/mol...

PRECALCULUS HELP PLEASE!

convert the polar equation to rectangular form. 1.) r sec(theta) = 3 2.) r = 4 cos(theta) - 4 sin(theta) convert from rectangular equation to polar form. 1.) x^2 + (y-1)^2 = 1 2.) (x-1)^2 + (y+4)^2 = 17

Math

Write 13/14 as a percent. Write the remainder in fractional form. I know that 13/14 as a decimal would be 92.857143 and as a percent around 92.86% my question is what would the remainder be and how to write it in fractional form?

algebra

suppose a market research company finds that a price of p=$22, they would sell x=42 tiles each month. If they lower the price to p=$12, then they would purchase the tile and they can expect to sell x=52 tiles in a month. Find the equation of the line for the demand equation. ...

science @elena please help

it has been hypothesized that chloroplasts originated from photosynthetic cyanobacteria that became symbiotic inside a host cell. Which of the following observations provides the strongest evidence for this suggestion? A) microscopically, chloroplast appear similar to ...

Calculus

Using 3(x-3)(x^2-6x+23)^1/2, as the chain rule differentiation of f(x)=(x^2-6x+23). Please explain how I find the general solution to the differential equation dy/dx= 2/27(x-3)SQUARE ROOT BEGINS (x^2-6x+23)/y SQUARE ROOT ENDS (y>0). In implicit form I have an answer of 18*y...

Math

Check my answers? a)Use the data shown above and express in words the amount the cab company charges per ride and per mile. cost = mx + b b)Write an equation in slope-intercept, point-slope, or standard form. Explain why you chose the form you did. cost = m (1) + b cost = 1.10...

algebra

write an equation in slope-intercept form of the line that passes through the given points. a. (-6,1), (3,-7) b. (-2/3,4), (6, -1/3) write an equation in point-slope form of the line that passes through the given poitns. c. (-2,5), (4,-3) d. (1/2,-1), (-2/3,6) plz show me how ...

Maths probability

Records show that 8% of blood samples tested for a certain condition test positive. Assuming that whether or not a blood sample tests positive is independent of whether or not any other blood sample tests positive, calculate by hand the following probabilities to three signi...

O-Chem

A student wished to prepare ethylene gas by dehydration of ethanol at 140 C using sulfuric acid as the dehydrating agent. A low-boiling liquid was obtained instead of ethylene. What was the liquid, and how might the reaction conditions be changed to give ethylene? I know that ...

chemsitry

A sample consisting of 0.025 mol of a solid compound is placed inside a metal cylinder. The cylinder was immersed in a water bath consisting of 10.00 kg of water at an original temperature of 25.00 °C. When the compound decomposes, the temperature of the water rises to 29.52...

chemistry

HCL is tritrated with NaOH. KHP is then added. A possible source of systematic error in this experiment is failure to dry the KHP. If this occured, would the final wt% NA2CO3 be falsely high, falsely low, or unaffected. Give reasoning. Thanks. You have left out much of the ...

Chemistry

Please help me with these questions: 1. Consider the equation:2Na+ 2H2O-->2NaOH +H2 -If 92.0g of sodium is reacted with 76.0g of water until the reaction goes to completion, which reactant will remain and in what quantity? A: I know that H20 is the reactant that is in ...

chm

1. What does the term electronegativity mean? Answer the tendency for an atom to pull electron density toward itself the number of positive charges in the nucleus minus the number of electrons around it an atom's ability to form bonds with oxygen atoms my answer>> the ...

Physiology

Glial cells normally lose their mitotic ability prior to birth True or False Which of the following is NOT a function of astrocytes? a. can take up NT from a synapse b.can stimulate or inhibit neurons c.needed to form synapses in the CNS d.Phagocytose foreign material in the ...

chem

Calculate [H3O] in the following solutions. 5.15x10-2M HCl and 7.62x10-2M NaC2H3O2 Responses HCl + NaC2H3O2. It appears there is an excess of H^+ which will react with NaC2H3O2 to form HC2H3O2. That gives you a buffer of C2H3O2 and HC2H3O2 and you use the H-H equation to solve...

chemistry

I posted this question on April 16 and received lots of help..but need more.. thanks Use the following information to identify element A and come pound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of 659.452 g after it has ...

english

Can soneone help me to combine each of the following groups of simple sentences into two longer sentences. Thanks 1. Darryl works as a model. He has to look his best. He gained ten pounds recently. He had to take off the extra weight. He would have lost his job. 2. My aunt ...

chemistry (Organic)

According to the two reactions below; 1-chloro-2,2-dimethylbatune + (warm NaOH 3)) 1-chloro-2-methylpropane + (cold dil.NaOH) 1) identify whether the reactions are Nucleophilic Substitutions (SN) or Elimination (E) reaction. 2) Complete the reaction mechanismin each and name ...

English

What makes a verb irregular? does not form it's past and present by adding -ed or -d to the past participle does not form it's past and past participle by adding -ed or -d to the present*** does not act as a verb in context functions as a verb but appears as an adjective

Social STUDIES

the 15 amendment - ratified in 1870 prohibited states from using race or color as standards for determining the right vote the 19th amendment- ratified 1920 prohibited the states from using gender as a voting qualification the 23 amendment- ratified in 1961 granted the ...

History

Match the following items. ① electors ② excise tax ③ Anti Federalist ④ republic ⑤ electoral college Ⓐ somebody who opposed the Constitution of the United States and the idea of a strong national government Ⓑ the group of people chosen ...

Science

It has been hypothesized that chloroplasts originate from photosynthetic cyanobacteria that became symbiotic inside a host cell.Which of the following observations provides the strongest evidence for this suggestion. A. Microscopically, chloroplasts appear similar to ...

Calculus

Two cars start moving from the same point. One travels south at 60 mph and the other travels west at 25 mph. At what rate is the distance between the cars increasing 2 hours later? Let x = the distance covered by the south traveling car. Let y = the distance covered by the ...

physics

A police car is traveling at a constant velocity 18 m/s north, when a car zooms by at a constant velocity 42 m/s due north. After a reaction time of 0.8 s the police car pursue the speeder with an acceleration of 5 m/s2. How long (in s) does it take for the police car to catch...

Calculus!!!

I need your help... I've posted this question a while ago but no one has answered it yet. Please please help me. Which of the following series can be used to compute ln(.8)? a) ln(x-1) expanded about x=0 b) lnx about x=0 c) ln x in powers of (x-1) d) ln(x-1) in powers of (x-1...

Spanish

I was hoping that I could get some to look my essay and tell me the proper tenses of the verbs. In the first paragraph the imperfect tense of the verb and in the second paragraph the need to be preterit tense. If you could help that would be great. Cuando era un niño siempre ...

Chemistry

Calculate the molarity of a solution made by dissolving 0.0715 mol Na2SO4 in enough water to form 550 mL of solution. While we're at it... How many milliliters of 10.6 M HCl solution are needed to obtain 0.205 mol of HCl? Also... How many grams of solute are present in 50.0 mL...

Chemistry

I could use some help on this question. I think the answer is choice E, but im not sure. Alcohols can function as both nucleophiles and as electrophiles in various reaction conditions. Which of the following statements is/are true. a)When R-O-H is a nucleophile, the O-H bond ...

Chemistry

I have been stuck on this question please help me solve it? The following reaction is used in some self-contained breathing devices as a source of O2(g). 4KO2(s)+2CO2(g)⇌2K2CO3(s)+3O2(g)Kp=28.5at25∘C Suppose that a sample of CO2(g) is added to an evacuated flask ...

Chemistry

Carbon tetrachloride (CCl4) and benzene (C6H6) form ideal solutions. Consider an equimolar solution of CCl4 and C6H6 at 25°C. The vapor above this solutionis collected and condensed. Using the following data, determine the composition in mole fraction of the condensed vapor. ...

Chemistry

The Ka for the reaction of acetic acid and water is 1.8 x 10-5. Which of the following statements is true at pH 7? A.) there is much more acetic acid than acetate ion B.) there is more acetate ion than acetic acid C.) the concentration of acetate ion is equal to that of acetic...

Chemistry

A mixture of ammonia and oxygen is prepared by combining 0.250 L of NH3 (measured at 0.700 atm and 20°C) with 0.160 L of O2 (measured at 0.720 atm and 49°C). How many milliliters of N2 (measured at 0.740 atm and 100. °C) could be formed if the following reaction occurs? ...

CHEMISTRY

The data below has been taken for the reaction of a dye with the hydroxide ion. The reaction was performed at two different hydroxide ion concentrations while the dye concentration was kept constant. What is the rate law? [OH─] = 0.10 M [OH─] = 0.20 M t (min) Abs ...

Ochem

What is the purpose of refluxing? Which reaction conditions are indicated with reflux? Will you apply heat? How do you know the temperature at which you should reflux? I think it is "A reflux system is used to condense vapours escaping from the hot flask. " Please help. Your ...

chemistry

THE QUESTION ASKS TO CALCULATE THE AMOUNT (IN GRAMS) OF CARBON DIOXIDE FROM THE AMOUNT OF SODIUM BICARBONATE THAT YOU USED IN THE REACTION Run 1. The reaction of citric acid and sodium bicarbonate is written as H3C6H5O7(aq) + 3 NaHCO3(aq) → Na3C6H5O7(aq) + 3 H2O(l) + 3 CO2(g...

CHemistry

Research the role of chemistry within a specific industry. Identify chemical processes upon which the industry relies. Explore environmental impacts of the industry that are related either to the chemicals it uses or produces. Procedure Choose one of the industries listed ...

hum 176

Choose a form of popular media that you are passionate about. The media may be music, a book, or a movie. · Write a thesis sentence stating how and why it is more than just a piece of entertainment. The thesis must include why it is a legitimate form of popular culture. Keep ...

chemistry

For the gaseous equilibrium represented below, it is observed that greater amounts of PCl3 and Cl2 are produced as the temperature is increased. PCl5 (g) <==> PCl3 (g) + Cl2 (g) a) what is the sign of delta S for the reaction? Provide a legitimate rationale for the ...

physics

A car is traveling at a constant velocity of 21 m/s (about 45 mph). The driver sees a fallen tree lying across the road and hits the brakes after a delay (reaction time) of 245 ms. (1 ms = 10-3 s.) Calculate the distance the car travels during this 245 ms reaction time period...

Chemistry(Please check)

1)A piece of metal with a mass of 5.50 grams changed in temperature from 25 to 55 degrees celsius when 21.3 joules was absorbed. What is the specific heat of the metal? a)0.256 b)0.129 c)3.91 d) 7.75 e)0.710 Jg^-1 C^-1 I chose 7.75 because I did 5.50/21.3 and then multiplied ...

chemsitry

b. The decomposition reaction may be written in this form: C12O36H20N12 (s) → 12CO2 (g) + O2 (g) + 6N2 (g) + 10H2O (l) In the enthalpy diagram below, the arrows represent standard enthalpy reactions. (3) denotes the standard enthalpy of decomposition of C12O36H20N12 (s...

chemistry

b. The decomposition reaction may be written in this form: C12O36H20N12 (s) → 12CO2 (g) + O2 (g) + 6N2 (g) + 10H2O (l) In the enthalpy diagram below, the arrows represent standard enthalpy reactions. (3) denotes the standard enthalpy of decomposition of C12O36H20N12 (s...

Physics

We discussed in lectures that traveling Electromagnetic waves in vacuum of the form E⃗ =E0xˆcos(kz−ωt),B⃗ =B0yˆcos(kz−ωt) satisfy all 4 Maxwell's equations. In lectures, I showed that an application of the generalized Ampere's Law (closed ...

Environmental Science

#54. In two or three well-developed paragraphs, define and list two characteristics of each of the following: coastal wetlands, coral reefs, and oceans. I'm not sure what it means by defining and listing two characteristics. here's my answer: Coastal wetlands are coastal land ...

AP Chemistry

I am fairly sure that a) is no change, and c) is shifts to the right...but I am not sure about b) and d). Thanks. How does the equilibrium position shift as a result of each of the following disturbances? Sodium bicarbonate undergoes thermal decomposition according to the ...

science(chem) plastic hedache...can anyone help?

My hwk Q that I was trying to find the answer to yesterday is this below but I don't know exactly how the placticizing process works. I compiled the chemicals I think I need but other than that I'm stumped as to how to put them together or how. Q: A water pipe has burst in ...

Chemistry

Which of the following rate laws suggests that the reaction probably occurs in a single step? NO(g) + O2(g) → NO2(g) + O(g) rate = k[NO][O2] H2O2 + 3 I- + 2 H+→ I3- + 2 H2O rate= kl[H2O2][I-]+K2[H2O2][I-][H+] H2(g) + Br2(g) → 2 HBr(g) rate = k[H2][Br2]1/2 (...

Math

a photocopy store advertises the following prices: 5 cents per copy for the first 20 copies, 4 cents per copy for the 21st through 100th copy, and 3 cents per copy after the 100th copy. Let x be the # of copies, and let y = the total cost of the photocopying. find the equation...

Check my CALCULUS answers please!

Any short explanation for things I got wrong would be great, too, if possible! Thanks in advanced! :) 8. Which of the following functions grows the fastest? ***b(t)=t^4-3t+9 f(t)=2^t-t^3 h(t)=5^t+t^5 c(t)=sqrt(t^2-5t) d(t)=(1.1)^t 9. Which of the following functions grows the ...

chemistry redox reactions

can someone check my labels for the reaction of a radical with an extra electron, (R(e-)) and an antioxidant, ArOH. R(e-) + ArOh --> RH + ArO(e-) R(e-) is oxidizing agent. ArOH is reducing agent. RH is reduced ArO(e-) is oxidized. Is this correct? And the other possible ...

language arts

read the following lines of dialogue from a coversation johnny has with mrs. bessie, the lytes servant. "what happened to that Cousin Sewall?" "Gone to Worcester. Joined up with the Minute Men." "But hes too fat and.." "Soft? No. From now on nobodys too fat nor soft nor old ...

English

Hello, I can't find the answer to these questions, What kinds of unwanted reactions might you get from readers of your messages whether it be negative, persuasive, or informative? Also, What steps would you take to ensure that the purpose of your message, informative, ...

Elements of University Composition and Communicati

Each of the following sentences has one grammatical error. The errors are in one of the following four categories: subject–verb agreement, run-on sentence, verb form and tense, or sentence fragment. Read each of the sentences and write the type of error in the column next to...

Spanish 1

The directions on this question say, "Usando los verbos de la lista, dé el mandato formal que mejor completa cada oración." My choices to choose from are: dar estar ir ser The question is: ________muchas atenciones a los invitados. I thought it was dar, in the form of den (I...

Chemistry

Acetic acid is a polar molecule and can form hydrogen bonds with water molecules. Therefore, it has high solubility in water. Yet acetic acid is also soluble in benzene (C6H6), a nonpolar solvent that lacks the ability to form hydrogen bonds. A solution of 3.8g of CH3COOH in ...

CHEMISTRY!!-

The following date were obtained for the reaction 2ClO2(aq)+2OH(aq)->ClO_3^-(aq)+ClO_2^-(aq) + H2O(l) where rate= delta[ClO_2]/ delta t [ClO_2]0 [OH^-1]0 Initial Rate (mol/L) (mol/L) (mol/L*s) .0500 .100 5.75*10^-2 .100 .100 2.30*10^-1 .100 .050 1.15*10^-1 a) Determin the ...

general chem

Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, simply write NR. (a) Nickel metal is added to a solution of copper (II) nitrate; (b) a solution of zinc nitrate is added to a solution of magnesium ...

Informal Logic

Write two arguments in English,one in the form of modus poens and one in the form of modus tollens. Then write the arguments in symbols using sentence letters and truth-functional connectives. Whay advantage does being able to symbolize our arguments provide? Are there ...

Research Methodology and Program Evaluation

Good morning, I wanted to see if someone could help me with the following questions because I am not too sure. Examining groups of people is considered an option in program evaluation. True False I selected false because there are different type of program evaluations and some...

Research Methodology and Program Evaluation

Good morning, I wanted to see if someone could help me with the following questions because I am not too sure. Examining groups of people is considered an option in program evaluation. True False I selected false because there are different type of program evaluations and some...

chem

An automobile burns 65 grams of gasoline over 20 minutes. The gasoline combines with 100 grams of oxygen in this reaction, to form carbon dioxide and 47 grams of water. How much carbon dioxide is formed? do I use the heat capacity equation? How much oxyen is used to produce 47...

chem

For the following reactions, name the Bronsted-Lowry acids and bases. Then name the conjugate acid and bases. H3O+(aq) + CN-(aq) <==> HCN(aq) + H2O I'm really confused on this whole concept even thought it's not really difficult. I said: acids: H3O+ bases: CN- conjugate ...

History [check?]

To consolidate his power in Italy, Benito Mussolini did all of the following except __________. a.He extolled the glories of ancient Rome. <-- b.He used militarism to rally his supporters. c.He gave the trade unions greater power. Which of the following did not contribute ...

Chemistry

Does sodium metal react with potassium hydroxide solution? No. It would be a displacement reaction and this only works if the metal is higher in the activity series than the one it wants to displace. Given that potassium is the highest ranked metal (sodium second), there ...

Chemistry

Table sugar consists mostly of sucrose, C12H22O11. The standard enthalpy of combustion for sucrose is the standard state delta H for the reaction: C12H22O11 + 12 O 2 ---> 12 CO2 + 11 H2O Calculate this standard state delta H. Give answer in units of kJ to five significant ...

CHEM

Consider the relation shown for the radius of the species indicated. Which choice presents a valid comparison? a) Na > Na+ b) Ca^+2 > Ca+ c) Cl > Cl- d) S- > S^2- I think that the answer is "a"...but not 100% certain. pls help.

english

OK im supposed to identify the part of speech of the word in brackets...A city must be planned [carefully], or people will not want to live in it. I think it is an adverb but im not certain.

chemistry

A weak monoprotic acid was calculated, using the usual formula for Ka, to give a pH of 7.4 at a certain concentration. The student who did the calculation was puzzled. What would you advice him/her to do?

PHYSICS

A CAR IS BEING DRIVEN BY AFORCE OF 2.5*10POWER10N.TRAVELLING AT ACONSTANT SPEED OF 5m/s,IT TAKES 2 MINUTES TO REACH A CERTAIN PLACE.CALCULATE THE WORK DONE.

Physics

An advertisment claims that a certain 1200 kg car can accelerate from rest to a speed of 25 m/s in 8.0 s. what average power must the motor supply in order to cause this acceleration?

calculus

the cost (in dollars) of producing x units of a certain commodity is C(x)=5579+13x+0.03x^2. Find the instantaneous rate of change with respect to x when x=103.

Geometry

At a certain time of the day, a 4-meter-tall vertical pole casts a shadow of 3 meters. What is the angle of elevation, to the nearest degree, of the Sun?

MATH

I still don't know how to completely solve systems by substitution. Can someone please help me? 1. Y=-11+x 3x+10y=-6 How would you know where to plug in the right section of the equation in a certain place? 2. Y =6x-5 Y =-x+9

A.P English

Would the use of the phrase "wore her out" regarding a certain character throughout the first 100 or so pages of the book count as parallelism?

math

An automobile rental angency charges $170 for 5 days for a certain model car. What is the unit price in dollars per day? why is it 59/3gal

Health

In striving to meet the 2010 Dietary Guidelines for Americans, one should consume more of certain foods and nutrients such as ________.

math

At a certain time of the day the elevation of the sun is 40 degrees. To the nearest foot, find the height of a tree whose shadow is 35 feet long.

chemistry

A certain amount of gas occupy 5.0dm cube at 2atm.and 10 degree centigrade .calculate d number of mole present(R_0.082atm)

chemistry

Free radicals are also important in many environmentally significant reactions. For example, photochemical smog, which forms as a result of the action of sunlight on air pollutants, is formed in part by the following two steps. X NO2 NO  O O  O2 O3 UV light  Ozone damages ...

CHEMISTRY

Write formulas for the compounds that form from Sr and each of the following polyatomic ion: NO3 −1, SO4 −2, PO4 −3. SR (+3 CHARGE) NO3(-1 CHARGE) SO4(-2 CHARGE) PO4(-3 CHARGE) Re posting this question. hopefully someone can help me answer this now. Please ...

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