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March 4, 2015

Search: How many oxygen atoms are in 2.90g of quartz?

Number of results: 5,812

science
Will you please check a few more? Physical change, chemical change or both kinds of change? 1. Sodium hydroxide dissolves in water (both) 2. Hydrochloric acid reacts with sodium hydroxide to produce a salt, water and heat (chemical) 3. A pellet of sodium is sliced in two (...
September 12, 2012 by Reed

some science
a filter tip or a cigarette acts as both a filter and a condenser. which of the following cannot be removed, assuming the filter tip is 100% efficient? a. carbon monoxide, boiling point -191 degrees. b. nicotine, boiling point 247 degrees. c. tar, boiling point 350 to 400 ...
December 22, 2006 by holly

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 ...
January 13, 2011 by jake

Chem
volume = 322 mL temperature = 150 celcius pressure = 175 kPa mass = 0.448 Calculate the molar mass of the gas. First I converted volume to 0.332 L. Second I converted 150 celcius into 423 kelvin. PV = nRt (175)(0.322) = n(8.314)(423) n= 0.016022988 molar mass = 0.448/0....
July 6, 2009 by Lena

Gas Laws and Energy
I have another question. I've tried it and i keep getting it wrong. The average kinetic energy of a 1.85-g sample of argon gas in a 3.00-L bulb is 1.28e-22 J/atom. What is the pressure of the gas? What is the root mean square velocity of the argon atoms under these conditions...
March 2, 2007 by Jay

Heath help Plz--5 questions
1. A percentile rank represents the percentage of people who scored at or below the test score. True** False 2. People who have high resting heart rates usually have high levels of cardiovascular fitness. True ** False 3. Resting heart rate is usually measured when you awake, ...
September 28, 2014 by Anonymous

Health--check my answers
1. A percentile rank represents the percentage of people who scored at or below the test score. True False 2. People who have high resting heart rates usually have high levels of cardiovascular fitness. True False 3. Resting heart rate is usually measured when you awake, ...
October 1, 2014 by Anonymous

chemistry 12
sry, a misprint. its: O2+2F2 <--> 2OF2 The question is looking for Kc. 2.50 mo of oxygen and 2.50 mol of fluorine gas are placed in a 2.00L glass container at room temperature. The container is heated to 400K and the following equilbirum is established: O2+2F2 <-->...
November 20, 2006 by Natalie

chemistry
The question is: What statements are true for the standard entropy change for the conversion of ozone to oxygen? The choices to pick from are: 1. Molecular factors predict an increase in entropy 2. Stoichiometric factors predict a decrease in entropy. 3. Molecular factors ...
February 4, 2015 by mar

Chemistry
Hi. Is PO4(3-) polar or non-polar? Why or why not? Thanks! Look up the electronegativity of P and O. I think I remember that O is about 3.5 and P is about 2.1; therefore, each P-O bond is somewhat polar. Thus, the ion will be polar unless the Lewis structure (electron dot ...
November 23, 2006 by Sally

English
1. What type of context clue is provided for the italicized word in the following sentence? "The ice, snow, freezing wind, deep ice cracks, called crevasses (this is italicized), and lack of oxygen are constant threats to climbers’ safety and health." a) example b) antonym c) ...
September 6, 2013 by Anonymous

chemistry (drbob222)
[Ni(NH3)m(H2O)p]^2+ + mHCl ->mCl- + pH2O + Ni^2+ + mNH4^+ excess HCl + OH- -> H2O A .185 g sample of nickel salt was dissolved in 30.00 mL of 0.1013 N HCl. The excess HCl required 6.30 mL of 0.1262 N NaOH to reach the end point. Calculate the weight of the salt that ...
October 4, 2009 by Anonymous

CHEMISTRY
1. If 29.0 L of methane, CH4, undergoes complete combustion at 0.961 atm and 140°C, how many liters of each product would be present at the same temperature and pressure? 2 If air is 20.9% oxygen by volume, a. how many liters of air are needed for complete combustion of 25.0 L...
October 10, 2013 by Anonymous

Chemistry - Periodic Table+Cations(check+help)
On which side of the periodic table would you find an element whose atom is likely to form a cation? Which atom property is related to this question? Ans: is it the right side of the periodic table that you would find the elements whose atom are likely to form a cation, since ...
February 2, 2011 by Farah

Chemistry - Periodic Table+Cations(check+help)
On which side of the periodic table would you find an element whose atom is likely to form a cation? Which atom property is related to this question? Ans: is it the right side of the periodic table that you would find the elements whose atom are likely to form a cation, since ...
February 2, 2011 by Farah

chemistry
Hi, Is the molecular formula different when it is in a gaseous state? Cheers ;) Sometimes yes, sometimes no. H2O, for example, is thought to be in a group of 6 as a liquid at room temprature, a group of 4 at higher temperatures, and single H2O molecules as steam. Thanks, Ive ...
February 6, 2007 by bertie

Chemistry
what is the molecular formula of a compound that is 54.5% C, 9.09% H, and 36.4% O. with a molecular weight of 176g/mol. A)C8H16O4 B)C4H8O2 C)C7H12O5 D)C9H18O3 Assume you have 100 g of the substance, then you have 54.5g of C, etc. Moles C= 54.5/12=4.54 mol Moles H= Moles O= ...
October 18, 2006 by Justyna

Chemistry
The reaction between NO (nitric oxide) and oxygen is a key step in the formation of acid rain. O2(g) + 2NO(g) → 2NO2(g) A series of experiments were run, each of which starts with a different set of reactant concentrations. From each experiment an initial rate of ...
March 27, 2012 by Roman

chem
hi, Can anyone plz advise me if this is the correct ballanced equation for CH4+NH3+O2 - HCN+H2O Answer: CH3+NH2+O1 - H3N+H2O1 Is this correct? Thanks ;) No, that is not correct. Hint: Put a six on the HCN Thanks!! At the end of it? I dont understand how that would be! I dont ...
May 27, 2007 by bertie

chemisty
I was told to post at the beginning of the page: not sure if I did so or how to really do it but i'm posting the question again): Diiodine pentafluoride reacts spectacularly with bromine trifluoride to form iodine pentafluoride, oxygen gas, and liquid bromine. In a particular ...
December 3, 2014 by nns40760

chemistry
A particular kind of emergency breathing apparatus-often placed in mines, caves, or other places where oxygen might become depleted or where the air might become poisoned-works via the following chemical reaction: 4KO2(s)+2CO2(g)--> 2K2CO3(s)+3O2(g) Notice that the reaction...
February 21, 2011 by Jake

chemistry
A particular kind of emergency breathing apparatus-often placed in mines, caves, or other places where oxygen might become depleted or where the air might become poisoned-works via the following chemical reaction: 4KO2(s)+2CO2(g)--> 2K2CO3(s)+3O2(g) Notice that the reaction...
February 21, 2011 by Jake

repost chemistry
A student adds 1.00x10^-8 moles HCl to a liter of soln. The resulting soln will be acid, basic, neutral, or impossible to determine? I believe that it is impossible to determine, because it does specify that the temperature was at 25*C. I know that a neutral pH deviates from 7...
February 12, 2009 by Anonymous

science
. What is cystitis? A. A congenital condition of the kidneys B. Inflammation of cysts in any organ C. A type of urinary tract infection D. Irritation of the urethra and/or meatus 9. Uremia is the result of A. electrolye imbalance in the intracellular body fluids. B. a high ...
November 12, 2010 by TONY

chemistry
thanks for any help with these translations into scientific notation: 1. magnesium ribbion is dropped into an aqueous solution of hydrochloric acid 2. a solid peice of copper is burned in pure oxygen 3. zinc carbonate is strongly heated in a crucible 4. calcium chloride is ...
January 19, 2007 by key

Dr. Bob
a gaseous hydrocarbon reacts completely with oxygen gas to form carbon dioxide and water vapor. given the following data, determine (delta)HoF for hydrocarbon: (delta)Horxn=-2044.5kj/mol hydrocarbon (delta)HoF CO2= -393.5kj/mol (delta)HoF H2O = -242kj/mol denstity of CO2 and ...
April 21, 2008 by Kim

Chemistry
Sulfur trioxide gas, one of the causes of acid rain, is produced in the upper atmosphere when oxygen reacts with sulfur dioxide gas in the reaction shown below: 2SO2(g) + O2(g) <--> 2SO3(g) deltaH0 = -197kJ The gases are placed in a reaction vessel and allowed to come to...
April 6, 2012 by Abbagail

Chemistry
I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its molecular weight is 102.2...
February 20, 2012 by Matthew

Chemistry
I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its molecular weight is 102.2...
February 20, 2012 by Matthew

Chemistry
I was wondering if somebody could help me with this... Classify the following substances as covalent molecules or ionic compounds: a. MgO e. LiCl b. NI3 f. SF4 c. CuS g. XeF4 d. NO2 h. CsF How do you know if they are covalent or ionic bonds? Metal + nonmetal is usually ionic ...
October 24, 2006 by Isabel

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...
January 13, 2011 by jake

Biology
19. The secondary xylem and phloem form from a. cork cambium b. vascular cambium c. apical meristems d. bark B? 7. A difference between beans and corn during germination is a. the cotyledons are above ground in the bean plant b. the corn shoot is hooked to protect it from ...
March 3, 2010 by mysterychicken

Biology
19. The secondary xylem and phloem form from a. cork cambium b. vascular cambium c. apical meristems d. bark B? 7. A difference between beans and corn during germination is a. the cotyledons are above ground in the bean plant b. the corn shoot is hooked to protect it from ...
March 3, 2010 by mysterychicken

Biology
19. The secondary xylem and phloem form from a. cork cambium b. vascular cambium c. apical meristems d. bark B? 7. A difference between beans and corn during germination is a. the cotyledons are above ground in the bean plant b. the corn shoot is hooked to protect it from ...
March 4, 2010 by mysterychicken

Chemistry
Please help and explain each problem. PLEASE!!!! 1. If 29.0 L of methane, CH4, undergoes complete combustion at 0.961 atm and 140°C, how many liters of each product would be present at the same temperature and pressure? 2 If air is 20.9% oxygen by volume, a. how many liters of...
October 10, 2013 by Anonymous

Sorry- Chemistry / Ionic Bonding
Hello My exams are coming I'm a straight A student .. the problem however is : My textbooks , teacher and every piece of work that he gives us is complicated can someone explain me how Ionic Bonding works . Please I really beg you... I need your help! My teacher sucks in ...
June 7, 2007 by Sasha

identifying a gas (check partial work)
A cylinder was found in a storeroom of a manufacturing company. The cylinder was so old that the label had fallen off, and no one remembered what the cylinder held. A 5 mg sample was found to occupy 4.13 mL at 23 Celsius and 745 torr. The sample was also found to be composed ...
June 16, 2006 by Kizner (chem)

chemistry
6.70 A sample of benzene, C6H6, weighing 3.51g was burned in an excess of oxygen in bomb calorimeter. The temperature of the calorimeter rose from 25.00C to 37.18C. If the heat capacity of the calorimeter and contents was 12.05kJ/C, what is the value of q for burning 1.25 mol ...
June 25, 2009 by Capacino

CHEMISTRY........
i TRIED TO DO IT, BUT MY ANSWERES ARE WRONG. Please show work and explain. 1. If 29.0 L of methane, CH4, undergoes complete combustion at 0.961 atm and 140°C, how many liters of each product would be present at the same temperature and pressure? 2 If air is 20.9% oxygen by ...
October 10, 2013 by Anonymous

Chemistry
Thinking about the uses of radioactive isotopes, which statement is true? A. The iodine isotope, I-27, is used to diagnose thyroid disorders. B. Radiation may be detected because it ionizes the atoms it affects. C. It’s clearly understood that irradiating food kills bacteria ...
June 24, 2010 by Sadie

Science- Ms. Sue
What evidence was found from soft tissue samples of a remarkable well-preserved Tyrannosaurus Rex that provided molecular evidence linking T.Rex to a chicken? A. Antibodies that react in a specific way with chicken proteins reacted in the same way with T. Rex proteins. B. ...
December 6, 2013 by Anonymous

Chemistry
Hi, I posted a question yesterday : A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of 0.157 of the compound produced 0.213g CO2 and 0.0310 g H20. In another experiment, it is found that 0.103g of the compound produces 0.0230 g NH3. What is the ...
April 15, 2010 by Anonymous

chemistry
why would lowering the temp and decreasing the pressure not increase the rate of the reaction: carbon monoxide gas is combusted in the presence of oxygen gas into carbon dioxide. (DeltaH for this reaction is -285kJ.) CO + O2 ==> CO2 + heat decreasing P drives the reaction ...
April 29, 2007 by alexa

Environmental Science
Answer the questions about the following processes in the space provided below. You only need to indicate a process by its number. For each question list as many processes as apply. Process 1: 6 CO2 + 6 H2O → C6H12O6 + 6 O2 Process 2: C6H12O6 + 6 O2 → H2O + 6 CO2...
August 18, 2014 by Sydney

Math
Chemistry of Life Multiple Choice 1. Which of the following form the main components of our body cells? carbohydrates and proteins fat and phosphorous proteins and iron nucleic acids and calcium 2. Organic compounds always contain______. water oxygen nitrogen carbon 3. Which ...
December 7, 2012 by Briana T

MATH
Chemistry of Life Multiple Choice 1. Which of the following form the main components of our body cells? carbohydrates and proteins fat and phosphorous proteins and iron nucleic acids and calcium 2. Organic compounds always contain______. water oxygen nitrogen carbon 3. Which ...
December 7, 2012 by Help!!!!!!!!!!!!!! Fast its urgent Please!!!!!!!!!

Health (Ms. Sue)
List five benefits both smokers and smokeless tobacco users can expect after quitting. A: Whether a person had used tobacco or not, choosing to live without tobacco dramatically improves a person’s quality of life. Therefore, five benefits of both smokers and smokeless tobacco...
November 18, 2013 by Anonymous

Science - Melting Ice
In the process of heating ice into the boiling state of its liquid form, did the procass absorb or release energy? Did the molecules spontaneously move fast? Where did the energy come from and where did it go? did it increase or decrease? was it lost? Were the molecules ...
October 18, 2006 by Sigor

CHEM Help!
My homework is about translating word equations and I need help in answering this question. Sodium phosphate reacts with calcium nitrate to produce sodium nitrate and calcium phosphate. What would be the answer? I also need help with this other question because it is kind of ...
March 11, 2008 by Anony

Biology
Can you guys please just help me out? 19. The secondary xylem and phloem form from a. cork cambium b. vascular cambium c. apical meristems d. bark B? 7. A difference between beans and corn during germination is a. the cotyledons are above ground in the bean plant b. the corn ...
March 3, 2010 by mysterychicken

7th grade science ASAP please!
1. Which of the following form the main components of our body cells? (1 point) carbohydrates and proteins fat and phosphorous proteins and iron nucleic acids and calcium 2. Organic compounds always contain______. (1 point) water oxygen nitrogen carbon 3. Which of these is a ...
November 4, 2012 by Delilah

chemistry
Q1) 5 liters of Butane gas (C4H10) is reacted with plenty of oxygen at 27 oC and 1 atm to produce carbon dioxide and water vapor. Calculate the following: 1- The volume of CO2 produced at 1 atm and 400 oC. 2- The mass of H2O vapor produced. 3- The mol % of the products. Given...
November 2, 2009 by David

Chemistry
Hi Please help verify my answer to the following question: 0.500g of pure phosphorous was burned in excess pure oxygen to give a product that has a mass of 1.145 g. What is the empirical formula of the resulting compound? By the use of a mass spectrometer the molecular mass of...
October 15, 2011 by Helpme

7th grade science Ms. Sue please only 5 questions
11. Which of these is selectively permeable? (1 point) door window screen wall mirror 12. The process that releases energy without using oxygen is ____. (1 point) photosynthesis respiration osmosis fermentation 13. The chromosomes in the nucleus of a cell contain a code known ...
December 6, 2012 by Delilah

physics
A power plant burns coal and generates an average of 600.0 Megawatts (MW) of electrical power while discharging 900.00 MW as waste heat. Find the total electrical energy generated by the plant in a 30-day period. Coals vary a lot in their energy content. The energy released by...
January 6, 2014 by Nika

photoautotrophs
oxidize chemicals to obtain energy obtain energy from light and carbon from carbon dioxide use light energy to synthesize water and sugar obtain electrons from oxygen and carbon from organic molecules WHICH ONE DO WOULD YOU PICK. I AM CLUELESS. This site is LONG and LONGER ...
October 3, 2006 by shellie

math statitics
The makers of the MAGNETIZER Engine Energizer System (EES) claim that it improves gas mileage and reduces emissions in automobiles by using magnetic free energy to increase the amount of oxygen in the fuel for greater combustion efficiency. Following are test results, ...
April 15, 2013 by Tyra

Chemistry
Hi, I am doing a practice test for my chemistry final and I do not understand one of the answer they gave for this thermochemical equation question. I do not understand how they got 400kJ. The question is: Butane has a deltaH of -2871 kJ/mol when it undergoes complete ...
June 19, 2013 by Matilda

chemistry
The typical person needs a 2000 calorie diet to sustain “normal” activity. Nowadays, a lot of the energy in American diet comes from fats and sugars. Assume that “fats” provide 9.0 calories per gram and sugars (treat as glucose) provide 4.5 calories per gram. If your “typical...
September 13, 2014 by Ashley

chemistry
If 15.0 grams of C3H6, 10.0 grams of oxygen, and 5.00 grams of NH3 are reacted, what mass of acrylonitrile can be produced assuming 100% yield, what mass of the excess reactants remain? 15g C3H6 (1 mol / 42.08 g) = .35 mol C3H6 .36 mol C3H6 ( 2 mol C3H3N / 2 mol C3H6) = .36 ...
February 5, 2015 by loulou

Chemistry
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 been filled with nitrogen gas at a pressure of 790. torr and a temperature of 15°C. ...
March 29, 2007 by Julia

science help
1.how do fossil fuels contribute to air pollution ? a) by releasing carbon dioxide into the air b) by recycling oxygen c) by reversing the greenhouse effect d) by releasing nitrogen into the air 2. How can human population growth affect ecosystems like rain forests a) human ...
May 19, 2014 by kelsey

Science - Chemistry
Aluminum oxide is formed from the reaction of metallic aluminum with oxygen gas. How many moles of Aluminum are needed to form 3.4 moles of Aluminum oxide? Writr the equation and balance it. 4Al + 3O2 ==> 2Al2O3 The equation tells you that 4 mols Al are needed to form 2 ...
January 23, 2007 by Sara

Sci
I am writing a peom on the element flourine and it should explain and the structure of the atoms that make up that element, explain why it is where it is on the periodic table, what element(s) it might combine with to make a compound/molecule, and finally, WHY it would ...
December 28, 2010 by Sumaiya

SCI !!!!
I am writing a peom on the element flourine and it should explain and the structure of the atoms that make up that element, explain why it is where it is on the periodic table, what element(s) it might combine with to make a compound/molecule, and finally, WHY it would ...
December 29, 2010 by Sumaiya

CHEMISTRY
I just took a chemistry midterm and our teacher let us keep the exam. I was wondering if you could let me know if I was right or wrong for the following questions. I can ask my professor later for details. Which of the following are best described as strong acids? (a) H2SO4 ...
July 7, 2010 by G

Chemistry
Are my answers correct? C6H14 + 19/2 O2 -> 6 CO2 + 7H2O enthalpy change = -4163 kJ a) if 0.537 mol of carbon dioxide is produced in the reaction represented by the equation above, how much heat is released by the reaction? Enthalpy change = 0.537 mol CO2 x -4163kJ/6 mol CO2...
February 10, 2013 by A Canadian

Chemistry
Please check my answers for the following questions. THANK YOU. 1) The empirical formula of a compound that is 25.9% nitrogen and 74.1% oxygen is.... ANSWER: N2O 2) empirical formula of a compound that consists of 4.80 grams of carbon, 1.20 grams of hydrogen, and 2.80 grams of...
August 2, 2007 by anonymous

Chemistry
The forces holding together an ionic solid are much stronger than the forces between particles in a molecular solid. How are these strong forces reflected in the properties of an ionic solid? a) strong hydrogen bonding exists between discrete molecules b) strong dipole-dipole ...
May 1, 2010 by Jake

AP Chemistry
Which of the following electron configurations correspond to an excited state? Identify the atoms and write the ground-state electron configuration where appropriate. If the configuration is a noble gas, enter the noble gas in brackets, for example [Ne] for F -. If the ...
October 30, 2011 by Ferdinand

science
can any one tell me how the distance between the oxygen atom joined to the ring and the -OH group of the carboxylic acid in aspirin ... can relieve pain? For example what would be the effect of increasing the distance ? Here is a LONG discussion of aspirin, much of it ...
July 26, 2007 by kat

AP Chemistry
A 2.5 gram sample of a hydrocarbon containing C, H, N, O is combusted in excess oxygen. The nitrogen compounds that are formed are treated to convert all of N to N2. The gases are passed through a CaCl2 drying tube which weighs 1.00 gram initially and 3.16 grams after the ...
April 24, 2011 by Kim

Molar Mass & Elements
The weight percent of oxygen in an oxide that has the formula MO2, is 15.2%. What is the molar mass of this compound? What element or elements are possible for M? what can someone give me a push in the right direction???? Let x be the taonic mass of the unknown element. Solve ...
June 26, 2006 by nglaze

Chemistry
What is the lewis structure for HBrO4. Also show the VSEPR structure The following, if it turns out ok, is the BrO4- ion.         .. >        :O: >        ..   ..&nbp&...
July 23, 2007 by Niraj

Physics Need quick help please
Estimate the total binding energy for copper. 550 MeV Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons. E= in Joules Please help me out I got 1st part I need the Energy in joules am confused please help me out...thanks Physics...
May 8, 2013 by Leila

ochem
Calcualte how many milliliters of carbon dioxide would be produced theoretically from 20g of sucrose of 25 degree C and 1 atmosphere pressure. I can use the formula PV=nRT 20g C12H22O11 * moles sucrose/342.3g suc. that would equal: .0584 moles. But what next. The experiment ...
October 9, 2006 by tesla

chemisrty
I have no idea how to do this activity..can someone please help!? In this activity you will investigate how chemical reactions are limited by the amount of reactants present. You will be using paper clips to represent atoms. You can describe the quantities of reactants and ...
November 16, 2009 by Ethan

Chemistry
Why is magnesium atom smaller than atoms of both sodium and calcium? The location of the outer electrons for Mg are in closer to the nucleus than of Sodium or Calcium. To add to the correct answer from Bob Pursley, consider the electronic configurations. 11Na = 1s2, 2s2, 2p6, ...
November 9, 2006 by Bryan

Chemistry
Hi I hope you can understand this...the Na ion is attached to the oxygen using ionic bonding. The \/ are meant to symbolize the hydrocarbon chain. The || is a double bond that bonds oxgen to carbon. O || Na O/\/\/\/\/\/ + CaCl2 -> ? + NaCl To give you some background, it ...
January 20, 2011 by Me

General Chemistry
Change these word equations into formula equations and balance them. Be sure to use the proper symbols to indicate the state of each substance as given. (a) Magnesium metal is placed into hydrobromic acid solution, forming hydrogen gas and aqueous magnesium bromide. (b) When ...
October 3, 2012 by Anonymous

Science
The galaxies in the universe are all flying away from each other. The speeds of nearby galaxies are proportional to the distance the galaxy is away from us. This relation, v=Hd is known as Hubble's law and the constant H is known as Hubble's constant. The evolution of our ...
May 20, 2013 by Abhishek Ranjan

chemistry urgent
if 100 g of iron were reacted with 100 g of oxygen according to the reaction below, the maximum yield in grams of Fe2O3 would be: chemistry urgent - bobpursley, Tuesday, November 30, 2010 at 4:20pm Balance the equation. Note the coefficents on Fe and O2, that is the mole ...
November 30, 2010 by lynn

Chemistry
Write a balanced equation using the correct formulas and include conditions (s,l,g or aq) for each of the following reactions. 1)Carbon monoxide gas reacts oxygen gas to produce carbon dioxide gas. Express your answer as a chemical equation. Identify all of the phases in your ...
November 14, 2010 by TMV

Science help,please...
1. Why is it rare for the soft parts of an organism to become a fossil? The soft parts take a long time to decay. The soft parts can be eaten by other animals. The soft parts cannot be buried in sediment. The soft parts form petrified fossils. 2. Which of the following terms ...
December 9, 2013 by Princess Anna

Physic please check
Consider two different hydrogen atoms. The electron in each atom is in an excited state. (a) Is it possible for the electrons to have different energies but the same orbital angular momentum L, according to the Bohr model? Justify. No.Electrons within the same obital angular ...
December 14, 2007 by Mary

check.
12. The substance produced by the light-reaction and used in the light-independent reaction is A. water B. oxygen C. hydrogen D. carbon dioxide hi there so I belive that the answer is b or d but i am leaning more toward b is that correct? Your question is really not phrased ...
June 30, 2006 by josiph

physics
The galaxies in the universe are all flying away from each other. The speeds of nearby galaxies are proportional to the distance the galaxy is away from us. This relation, v=Hd is known as Hubble's law and the constant H is known as Hubble's constant. The evolution of our ...
May 23, 2013 by hrdcvrdcv

Chemistry
1) The formation of water is represented by the following equation : 2H2(g) + O2(g) -> 2H2O(g) a.What is the limiting reactant if 4 mol of oxygen reacts with 16 mol of hydrogen? b.What amount (in moles) of water is produced in this reaction? 2) . Sliver nitrate, AgNO3(aq),...
December 19, 2012 by IMPO QUESTION

Chemistry
Electron Transfer Theory Write an label the oxidation and reduction half-reaction equations. a) Ni(s) + Cu(NO3)2(aq) -> Cu(s)+ Ni(No3)2(aq) oxidation - Ni(s) -> Ni2+(aq) + 2e- reduction - Cu2+(aq) + 2e- -> Cu(s) b) Pb(s) + Cu(NO3)2(aq) -> Cu(s) + Pb(NO3)2(aq) ...
February 10, 2008 by Alex

Chemistry
Electron Transfer Theory Write an label the oxidation and reduction half-reaction equations. a) Ni(s) + Cu(NO3)2(aq) -> Cu(s)+ Ni(No3)2(aq) oxidation - Ni(s) -> Ni2+(aq) + 2e- reduction - Cu2+(aq) + 2e- -> Cu(s) b) Pb(s) + Cu(NO3)2(aq) -> Cu(s) + Pb(NO3)2(aq) ...
February 10, 2008 by Alex

Chemistry
Which of the following is an example of quantization? A. The amount of time spent in a classroom B. The number of students in a classroom C. Learning happening in a classroom D. The temperature range in a classroom I know I asked this question but I would this paragraph. Is it...
December 14, 2014 by Morgan

science
1. Force exerted on an area is called _____. (1 point) pressure temperature gravity mass 2. The composition of the atmosphere is changing due to _____. (1 point) smog ozone depletion increase in CO2 (carbon dioxide) all of the above 3. The _____ is the layer of the atmosphere ...
September 26, 2012 by Delilah

science
I am studying science at GCSE. I a working through a revision book and have come across a question which i am unsure of the answer. The question is, "state the number of different elements present in C6H5CO2Na." The answer i have is 14 but still i am unsure. Please could ...
March 19, 2007 by sam

Physics/ Chemistry please help
The active ingredient in the allergy medication Claritin contains carbon (C), hydrogen (H), chlorine (Cl), nitrogen (N), and oxygen (O). Its molecular formula is C22H23ClN2O2. The standard adult dosage utilizes 1.480 1019 molecules of this species. Determine the mass (in grams...
April 14, 2007 by Mary

Science
The biochemical conversion of Glucose, C6H12O6, into pyruvic acid, C3H4O3, is an important step in the TCA (Kreb’s) cycle which forms a part of the metabolic breakdown of glucose (to produce energy). C6H12O6 (s) + O2 (g) → 2C3H4O3(l) + 2H2O (l) glucose oxygen pyruvic ...
October 22, 2011 by Tammy

life science
name the three enviormental factors in order for an organism to live. temperature, nutrients. Nutrients include oxygen, nitrogen, carbon dioxide and other gases if needed. Some organisms use ammonia as a nutrient. Since this is not my area of expertise, I searched Google under...
May 6, 2007 by Emily

Phisical Science
If the absolute temperature of a gas is 600K, the temperature in degrees Celsius is? C= K-273 327 C what is the first step to designing an experiment what is a mole in measurement like mole mass. please help me get info. explain the relationship between velocity and ...
June 16, 2005 by Julio Paz

chemistry
When 1.24g of an organic compound with the formula CxHyOz is burned in excess oxygen, 1.76g of carbon dioxide and 1.08g of water vapor are obtained. What is the empirical formula of the compound? Determine the moles of CO2 in 1.76grams, that will give you the moles of C in the...
August 23, 2005 by kevin

science
I need some help with my science homework. Well it is not really my homework it is my study guide but the actual test is the same as the study guide almost. They just switch around the words and stuff around to mess with your mind. These were just the only 7 problems I need ...
February 25, 2008 by JAKE

science
I need some help with my science homework. Well it is not really my homework it is my study guide but the actual test is the same as the study guide almost. They just switch around the words and stuff around to mess with your mind. These were just the only 7 problems I need ...
February 25, 2008 by JAKE

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