mel

This page lists questions and answers that were posted by visitors named mel.

Questions

The following questions were asked by visitors named mel.

The heights, h, of the students in the chorus at Central Middle School satisfy the inequality |h-57.5/2|¡Ü 3.25 when h is measured in inches. Determine the interval in which these heights lie and express your answer to the nearest tenth of a foot. [Only a...

A person pushes a 10 kg box from rest and accelerates it to a speed of 3.2 m/s with a constant force. If the box is pushed for a time of 2.6 s, what is the force exerted by the person? force*time=mass*changeinvelocity solve for force.

What is the chemistry behind the ASA – FeCl3 reaction?

I don't understand ehat is the chemistry behind the ASA – FeCl3 reaction? what is this question even asking? any response will do so plz help (Broken Link Removed)

OKOK I know that I have posted this question but I just don't understand the last part. 50.0 ml of a 0.0500 M solution of lead (II) nitrate is mixed with 40.0 ml of a 0.200 M solution of sodium iodate at 25°C. Calculate the Pb2+ and IO3- concentrations wh...

Dr.Bob you had told me to ignore 2x so I wondering if I wrote my did these steps correctly. Calculate the molar solubility of nickel (II) hydroxide in 0.100 M sodium hydroxide The solubility product of nickel (II) hydroxide at 25°C is 1.6 x 10-16. Ni(OH)2...

I know you've read this question too many times already but I just want to make sure I did the last part (Ksp) correctly. 50.0 ml of a 0.0500 M solution of lead (II) nitrate is mixed with 40.0 ml of a 0.200 M solution of sodium iodate at 25°C. Calculate t...

i need to know what in the body there is 11 of or what 11 may relate to a certain body part? Need human physiology help here. Thank you for using the Jiskha Homework Help Forum. The first book on this site mentions 11 body systems: http://www.hometraining...

how many moles of Cl- ion in the solution containing 0.187g Cl- dissolved in 50.0 ml water.

What is the molarity of the Cl- ion in the solution of a sample containing 0.187g Cl- dissolved in 50.0 ml water?

how much of each of the following substances would you add to water to prepare 1.20L of a .85M solution? (H2SO4 from "concentrated" (18M) sulfuric acid) ? I am stuck on how to work this one out. thanks

how much of each of the following substances would you add to water to prepare 1.20L of a .85M solution? (sodium carbonate from the pure solid) ? I am stuck on how to work this one out, too. thanks

I have the following problems- write net ionic equations for reactions if no reaction write NR.... silver nitrate and ammonium carbonate sodium phosphate and potassium nitrate silver nitrate and barium chloride copper (II) chloride and sodium hydroxide co...

what is the formula that will be used for this ? what volume of .100 M NaOH will react completely with 24.00 mL of .900 M HCl?

A solution of ethanol (C2H5OH) in water is prepared by dissolving 57.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 240.0 mL of solution. What is the molarity of the ethanol in this solution?

A solution is prepared by dissolving 16.5 g ammonium sulfate in enough water to make 145.0 mL of stock solution. A 10.50 mL sample of this stock solution is added to 57.70 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the f...

The units of parts per million (ppm) and parts per billion (ppb) are commonly used by environmental chemists. In general, 1 ppm means 1 part of solute for every 106 (one million) parts of solution. Mathematically by mass: ppm = µg solute / g solution = mg...

A standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepared by dissolving 13.0 mg of fluoxymesterone in enough water to give a total volume of 500.0 mL. A 100.0 µL aliquot (porti...

What does Antony say Caesar's death symbolizes? Act 3-Scene 2

hot-air balloon is filled with air at a volume of 3.64 x 10^3 m^3 at 745 torr at 39C. the air in balloon is heated to 60C, causing balloon to expand to a volume of 4.50x 10^3 m^3. what is the ratio of the number of moles of the air in heated balloon to or...

given the reaction - Fe(s)+H2SO4(aq)->FeSO4(aq) + H2(g) the volume of the balloon was 4400m^3 and the loss of hydrogen gas during filling was est. at 20%. what mass of iron splints and 87% (by mass) H2SO4 were needed to ensure complete filling of the ball...

compund containing only C, H, and N yeilds the following data- 1. complete combustion of 34.3 mg of the compund producedmg of CO2 and 40.3 mg of H2O 2. a 65.2mg sample was analyzed by the dumas mthod, giving 35.6 mL of N2 at 740 torr and 25C 3. effusion r...

C6H12O6(aq)->2 C2H5OH(aq) + 2CO2(g) Fermentation of 744mL grape juice(density=1.0 g/cm^3) is allowed to take place in a bottle witha V of 825mL until 12% by volume is ethanol (C2H5OH). Assuming CO2 is insoluble in H2O what would the pressure be of the CO2...

75L stainless steel container was charged with 3 atm of hydrogen gas and 4 atm of oxygen gas. a spark ignited the misture, producing water. what is the pressure of the tank at 25C? at 125C?

How can separate 1L samples of O2 and H2 have the same average velocity/

using the van der Waals equation calculate the pressur exterted by .5160 mol N2 in a 1L container at 24.6C

a 2.747g sample of manganese metal is reacted with excess HCl gas to produce 3.24L of H2 at 366K and .927atm and a manganese chloride compound(MnCl0. What is the formula of the manganese chloride compound produced in the reaction?

a 13.5L tank is filled with H2 to a pressure of 2x10^2atm. How many balloons (each 2L) can be inflated to a pressure of 1 atm from the tank?assume there is no temp change and tank cant be emptied below 1 atm of pressure

consider separate 1Lsamples of He and UF6 both at 1 atm and containing the same number of moles. what ratio of temps for the two samples would produce the same root mean square velocity?

In 1897 the Swedish explorer Andree tried to reach the North Pole in a balloon. The balloon was filled with hydrogen gas. The hydrogen gas was prepared from iron splints and diluted sulfuric acid. The reaction is given below. Fe(s) + H2SO4(aq) FeSO4(aq) +...

Use the data in Table 5.4 to calculate the partial pressure of He in dry air assuming that the total pressure is 1.0 atm. Assuming a temperature of 21°C, calculate the number of He atoms per cubic centimeter. atoms/cm3 .00000524 - atmospheric composition...

A piece of solid carbon dioxide, with a mass of 6.2 g, is placed in a 4.0 L otherwise empty container at 21°C. ( a) What is the pressure in the container after all the carbon dioxide vaporizes? atm (.86 atm) (b) If 6.2 g solid carbon dioxide were placed i...

a) Calculate the pressure exerted by 0.5160 mol N2 in a 1.0000 L container at 24.6°C using the ideal gas law. atm (b) Calculate the pressure exerted by 0.5160 mol N2 in a 1.0000 L container at 24.6°C using the van der Waals equation. atm (c) Compare the r...

A 75.0 L stainless steel container was charged with 3.00 atm of hydrogen gas and 4.00 atm of oxygen gas. A spark ignited the mixture, producing water. What is the pressure in the tank at 25°C? in atm What is the pressure in the tank at 125°C? in atm

can you help me with the ones you helped me with last nite? lower on page one i put my results i got down for you to see if i am even close

what is the equation for calculating ÄE? here is my info- q=-39kJ, w=88kJ

a system udergoes a process consisting of the following 2 steps- 1. absorbs 79J of heat while 26J of work is done to it 2. system absorbs 26J of heat while preforming 79J of work what is overall ÄE? is it 52J?

in the equation 2SO2 + O2 -> 2SO3 how do you find if work done is >, <, or = to 0?

consider a mixture of air and gasoline vapor in a piston. original V is 30cm^3. if the combustion of misture releases 985J energy, to what volume will the gases expand against a constant pressure of 655 torr if all energy of combustion is converted into w...

how do I find the ÄH for C2H4 + O3 --> CH3CHO + O2?

One mole of H2O(g) at 1.00 atm and 100.°C occupies a volume of 30.6 L. When one mole of H2O(g) is condensed to one mole of H2O(l) at 1.00 atm and 100.°C, 40.66 kJ of heat is released. If the density of H2O(l) at this temperature and pressure is 0.996 g/cm...

A balloon filled with 22.3 mol helium has a volume of 500. L at 0.0°C and 1.00 atm pressure. The temperature of the balloon is increased to 38.0°C as it expands to a volume of 570. L, the pressure remaining constant. Calculate q, w, and E for the helium i...

The specific heat capacity of silver is 0.24 J/°C·g. (a) Calculate the energy required to raise the temperature of 140.0 g Ag from 273 K to 295 K. J (b) Calculate the energy required to raise the temperature of 1.0 mol Ag by 1.0°C (called the molar heat c...

On Easter Sunday, April 23, 1983, nitric acid spilled from a tank car near downtown Denver, Colorado. The spill was neutralized with sodium carbonate. 2 HNO3(aq) + Na2CO3(s) 2 NaNO3(aq) + H2O(l) + CO2(g) (a) Calculate H° for this reaction. kJ Approximatel...

2 HNO3(aq) + Na2CO3(s) 2 NaNO3(aq) + H2O(l) + CO2(g) (a) Calculate H° for this reaction. kJ

Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341 kJ/mol), C4H8 (-2755 kJ/mol), and H2...

Consider the following reaction. 2 HCl(aq) + Ba(OH)2(aq) BaCl2(aq) + 2 H2O(l) H = -118 kJ Calculate the heat when 112.4 mL of 0.500 M HCl is mixed with 300.0 mL of 0.515 M Ba(OH)2. Assuming that the temperature of both solutions was initially 25.0°C and t...

2 HCl(aq) + Ba(OH)2(aq) BaCl2(aq) + 2 H2O(l) H = -118 kJ Calculate the heat when 112.4 mL of 0.500 M HCl is mixed with 300.0 mL of 0.515 M Ba(OH)2. Assuming that the temperature of both solutions was initially 25.0°C and that the final mixture has a mass...

You are given the following data. P4(s) + 6 Cl2(g) 4 PCl3(g) H = -1225.6 kJ P4(s) + 5 O2(g) P4O10(s) H = -2967.3 kJ PCl3(g) + Cl2(g) PCl5(g) H = -84.2 kJ PCl3(g) + 1/2 O2(g) Cl3PO(g) H = -285.7 kJ Calculate H for the following reaction. P4O10(s) + 6 PCl5(...

Consider the following cyclic process carried out in two steps on a gas. Step 1: 48 J of heat is added to the gas, and 20. J of expansion work is performed. Step 2: 70. J of heat is removed from the gas as the gas is compressed back to the initial state....

answer the following questions assuming that m (subscript s) could have three values rather than two and the rules for n, l and m (subscript l) are the normal ones. 1. how many electrons would an orbital be able to hold? 2. how many elements would the fir...

calculate the change in energy expected for each of the following processes 1. Rb(g) + Br(g) --> Rb+ (g) + Br- (g) 2. Mg(g) + I(g) --> Mg+ (g) + I- (g) 3. Mg+ (g) + I(g) -> Mg+2 (g) + I- (g) 4. Mg(g) + 2I (g) -> Mg+2 (g) + 2I- (g) in kJ

calculate the max wavelength of light capable of removing an electron for a hydrogen atom from the energy state characterized by the following : n=2 in nm n=4 in nm

what is the energy of a mole of UV photons having a wavelength of 13nm?

Using data from this chapter, calculate the change in energy expected for each of the following processes Rb(g) + Br(g) Rb+(g) + Br -(g)

Simplify (x+1)(x2+x-1) that should be x squared. the superscript didn't carry over.

Find an equation with the given form in each case below. y=sinè through(ð/2, 0)

the points a, b, c, d, e, f, g are equally spaced along a line. Name a vestor which is equal to 3BD

find the resultant of each pair of forces acting on an object a) forces of 7N east and 12N west b) forces of 7N east and 12N north

a man weighiing 7-kg lies in a hammock whose ropes make angles of 20 and 25 degrees with the horizontal. What is the tension in each rope?

what is 1+1 equal

Delta airline flights seats 340 people. An average of 5% of the people with reservations doesnt show up, so they overbook by 350. This system can be analyzed by using binomial distribution. n=350 and p=0.95 1) Find the probablity that 350 reservations the...

water depletion in the netherlands

why is farming so important?

what does the approach hypothesis driven science usually start with?

what is the metal ion formula for BaCL2 (times) 2H2O

Nacl what is the metal ion formuala and non metal formula

"most men lead lives of silent " what does that quotes mean to you write 5-7 sentences

what would cause scientists t change the current model of an atom

give the etymology of the root word : BIO and where it is derived from and the definition

what are two higher level words for the root word: BIO

Charlie wants to buy a $900 TV in 9 months. How much should he invest now at 17% simple interest to have the money in 9 months?

can you give me a good sentence using the word biology and biography

whats a sentence using periodically

where can i find free SAT problems and ACT problems

can you give me sites that are all about aquaphobia i can't find any good ones

caculate the number of moles in 8200 g of iron

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

2cr(s) + SnCL4(aq) --> can this reaction occur if so write the balanced equation if it doesnt explain why

what is the primary focus of the nonintervention perspective

a ramp is 0.5m high and has a slope of 4m long.what is the mechanical advantage?

a person accused of a crime does not have the right to a speedy trial] b a presidential pardon] c the assistance of counsel for his or her defense d a trial by jury

A brick is thrown upward from the top of a building at an angle of 10° to the horizontal and with an initial speed of 11 m/s. If the brick is in flight for 2.8 s, how tall is the building?

A tennis player standing 11.0 m from the net hits the ball at 3.34° above the horizontal. To clear the net, the ball must rise at least 0.320 m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the r...

i really need to know about gases if anyone's got any ifo please tell me!! Tar mel xx

A football punter accelerates a football from rest to a speed of 8 m/s during the time in which his toe is in contact with the ball (about 0.16 s). If the football has a mass of 0.50 kg, what average force does the punter exert on the ball?

A bag of sugar weighs 6.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth?

how do i evaluate using formulas? i did almost the entire thing, but i can't finish the problem because i don't know how to simplify it: tan(-5/12pi) i can get until this part: = (-6pi/24)+(4pi/24) / 1-(-2pi/24)

7/13 divided by 3/4

how many square cards of side 5cm can you cut from a rectangular sheet of paper of length 200cm and width 10cm?

- radical 2 belongs to which groups irration , real,rational

what is R^0 R^8 equal

A two-tailed hypothesis test at the 5 percent level of significance (£\ = .05) is exactly equivalent to asking whether the 95 percent confidence interval for the mean includes the hypothesized mean. If the confidence interval includes the hypothesized mea...

Answers

The following answers were posted by visitors named mel.

so part a 0.187/35=0.005 mole Cl- divided by part b 50mls

thanks your great

i don't know where to find the constant values for a and b

i did have a typo sorry it is MnCl

the answer i got was .15713mol for H2. i used that same number for the mol of Fe and H2SO4. since the equation is a 1 to 1 mol ratio. i got 8.775g of Fe and the answer needs to be in kg. so it should turn out to .008775kg. however i was told that is wrong...

so how do i now figure out the H2SO4? am i still using the same number of moles as the Fe?

yes it did, but now i can seem to figure out the 87% sulfuric...am i using the same number of moles as the Fe?

do i need to change the cc into ml? for the equation?

am i using the 1 atm for pressure or the 1.950 atm for the first part?

for the first n i got .0638129 rounded... is that right?

so i plugged int he information that i have from the question... i am using an electronic based hmwk. it says that the answers that i have gotten are wrong... here is what i have come up with.... with using PV=nRT i got a pressure of 12.6012 atm... with u...

where would i look up the delta Hf for CH3CHO, O2, O3, and C2H4? online?

to find C am i just using the equation from a?

i don't understand b.

for q i got 70538.931 for w i got 7091 and for the change i got 77629.931 the last one was worng, are they all wrong?

i don't get how to find the delta H of the products or the reactants....do i have to figure them out or look them up?

yep you are right thanks

all you have to do then is divide the -118 by 2 and then multiple that answer by .02810? so q would then be -1.6579?

and it was a positive, right?

i know that i am slow here at chem but how do i find out the limiting reactant... i think it is the HCl but i am not sure. then how to do the rest of the problem. i have a few others like this problem. if you have time can you help me work it step by step...

for the mols of Ba(OH)2 i got .1545 so in this reaction the limiting reagent is the Ba(OH)2? is that correct?

OH i see i didn't continue with the equation in that case .. Hcl will produce .2810mols and Ba(OH)2 will still produce the .1545mol b/c ration is one to one, correct?

You are given the following data. P4(s) + 6 Cl2(g)--> 4 PCl3(g) H = -1225.6 kJ P4(s) + 5 O2(g) --> P4O10(s) H = -2967.3 kJ PCl3(g) + Cl2(g) --> PCl5(g) H = -84.2 kJ PCl3(g) + 1/2 O2(g) --> Cl3PO(g) H = -285.7 kJ Calculate H for the following reaction. P4O...

find the prepostional phrase 1. The word robot comes from a play by karel capek.

that's the way the question was presented

thx, i just have problems drawing the diagrams

changes peoples worldview

it has a Bacl2 then a dot in the middle then 2h2o

i think so can u please helpp!

a combining form meaning “life” occurring in loanwords from Greek (biography); on this model, used in the formation of compound words (bioluminescence) so is that the answer?

i dotn see where it shows examples

that didn't help just tell me a good sentence for each words

i don't no a good sentence that's why im asking you for help

CCI outpatient code editor

119 degrees celsius

what are the names of all the gases? i need it for my school poster thing i am doing and really really need to know. oh and i need to know any other info about 'gases around us' (or just gases!! tar xx

you make the problem difficult when you don't supply the images

diffence between dipole interactions and vanderwaal forces

I am having problems with this assignment as well. What do they mean by characteristics of orientalism?

oops i forgot the =2sec^2

I didn't read about aaron.. but i did read about the Pharoah and Moses. can i do it from the point of view from the Israelite's and the Egyptians?

also if you can give me an example of what i have to write...

Thank you both :)

I know my writing is always squishy and vague :/ i was never really am good at writing. but the important thing is that now i know what i have to do Thanks a lot everyone

Thank you! so i have to do a 600 word conversation like...... siddartha - hello Confucius - how are you? ^ like that but in 600 words?!

Thank you soo much! is there a website where theres information between the cultures or the culture of hellenic greece

Thanks Ms.Sue!!!

yaaa i know but that didn't help at all because theres no information about it

What tribe has been conquered byy the Incas?

It only shows that the spanish conquered the incas..

Lol thank you i found a website!!!!!!!

oh like write about how they conquered but also how they brought peace..?

Thank you Ms.Sueeeeeeee

The number of tickets sold each day for an upcoming performance of Handel's Messiah is given by N(x)=-0.4x^2+9.6x+10, where x is the number of days since the concert was first announced. When will daily ticket sales peak and how many tickets will be sold...

Is it 12/8 ? Actually my daughter is having difficulty on the same exaclly problem.

My answer is 7 x 9 2 x 9 = 18; 5 x 9 = 45; 18 + 45 = 63.. is this correct

I do not know what you mean by answer grazing, but I genuinely need help with the question.

could yo explain part b?

Thank You Very !

b.) A 33.3 N force is acting on a 285 kg slab. Determine the acceleration of the slab.

haha im in your class and same name haha same question too

the first one I have: sigma=-(P*l_AB^3)/(3*E*I)

This was a multiple chocie question, so the possible answers are: A) 20,000 L B) 1000 L C) 10,000 L D) 2000 L E) 200 L D, 2000 L, is apparently the correct answer, but I don't know how to come to that conclusion.

the first answer is somewhat wrong. the approach is almost correct, though. Electric field = F/q. E*charge of electron = F 1.16E4 * 1.6E-19 = 1.856E-15 N F=ma mass of electron = 9.11E-31 kg F/m = a 1.856E-15/9.11E-31 = 2.04E15 m/s2 0.5*(Vf-Vi)^2 = a(Xf-Xi...

god bless america. %100

thnxs so much really

@Donald Trump lol

which fraction converts to a terminating decimal: 5/6, 1/3, 4/7, 3/16

If Ice cream cost $0.30 per cubic in, how much will it cost to fill the cone?

how the hell do you do this.

say cheese is right :)

whats the awnser???

so what is the answer????