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May 2, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
Gaseous butane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 29.1 g of butane is mixed with 64. g of oxygen. Calculate the minimum mass of butane that could be left over by the chemical reaction. Be sure your answer has the ...
Wednesday, September 16, 2015 by lauren

Chemistry
Calculate the number of moles of carbon atoms present in 1.1 g of ethanol (C2H6O). Answer in units of mol.
Wednesday, September 16, 2015 by Nicole

Chemistry
How many atoms of mercury are present in 3.2 cubic centimeters of liquid mercury? The density of mercury is 13.55 g/cc. Answer in units of atoms.
Wednesday, September 16, 2015 by Nicole

Chemistry
An analysis of nicotine (MW = 162 g/mol) gives 74.0% carbon, 8.65% hydrogen, and 17.3% nitrogen. What is the TRUE (MOLECULAR) formula for nicotine? All I need are the formulas!!
Wednesday, September 16, 2015 by Nicole

chemistry
A sample of a copper chloride of mass 1.425g is treated with a water solution of silver nitrate, and the AgCl formed had a mass of 3.038g. What is the correct empirical formula of the copper chloride?
Wednesday, September 16, 2015 by melissa

Chemistry
A 50g chuck of metal (c=0.506 j/g degrees celsius) is heated to 60 degrees celsius. It is then dropped into a calorimeter (c=1.40 j/g derees celsius, m - 5.0g) that contains 100g of liquid. The temperature of the liquid raises from 15 degrees celsius to 20 degrees celsius. ...
Wednesday, September 16, 2015 by Renae

Chemistry
A 50g vhuck of metal (c=0.506 j/g degrees celsius) is heated to 60 degrees celsius. It is then dropped into a calorimeter (c=1.40 j/g derees celsius, m - 5.0g) that contains 100g of liquid. The temperature of the liquid raises from 15 degrees celsius to 20 degrees celsius. ...
Wednesday, September 16, 2015 by Renae

Chemistry
a 250.0g mass of metal at 112.4 degrees celcius is dropped in a calorimeter (c=1.40j/g degrees celsius, m = 5.0g) containing 150.0g of water. The water and calorimeter are initially at 25.0 degrees celsius. At the end of the experiment, the temperature of the water, ...
Wednesday, September 16, 2015 by Renae

chemistry
Oganic solvents are not suited to be heated with one of the followings: Oil Bath Electric hot plate Water bath Bunsen burner flame 2 Which of the following is not an inflammable liquid ? Water Ethanol Kerosine Benzene 3 These are some safety precausions necessary in a ...
Wednesday, September 16, 2015 by onyi

chemistry
1 In the reaction of potassium permanganate and iron salt in acidic medium, how many moles of manganese reacted with iron? 2 moles of Mn with 1 mole of Fe 1 mole of Mn with 5 moles of Fe 1 mole of Mn reacts with 1 mole of Fe 5 moles of Mn reacts with 1 mole 2 Which of the ...
Wednesday, September 16, 2015 by onyi

chemistry
When chemicals pour on the skin, the laboratory first aid is to ---------------. Apply 1% sodium carbonate Apply 1% boric acid solution Flush the eye with a copious amount of clean lukewarm running water Wash with soap and warm water 2 For cut sustained in the laboratory ...
Wednesday, September 16, 2015 by onyi

Chemistry college
You are given a recipe for a buffer that contains 5% (w/v) MgSO4.7H2O. However, you only have MgSO4 anhydrous available to you. How much MgSO4 anhydrous do you need to make 0.5L of the buffer with the same molar concentration as in the recipe? Show your calculations
Wednesday, September 16, 2015 by Anna

chemistry
science
Wednesday, September 16, 2015 by ritik

Chemistry
Which of the following shows the correct dissolution reaction for BaCl2?
Wednesday, September 16, 2015 by Morgan

Chemistry
What is the concentration (M) of K+ in a solution made by mixing 25.0 mL of 0.100 M KCl with 50.0 mL of 0.0500 M KCl? Can you please explain how to solve this problem. I thought to do 25*.1+50*.05=5 But that seems wrong. What should I try to do?
Wednesday, September 16, 2015 by URGENT

chemistry
1.2x10 to the 9th power gallons of water per day converted to gallons per second
Tuesday, September 15, 2015 by Art

chemistry
a flask is charged with 2.00 atm of nitrogen dioxide and 1.00 atm of dinitrogen tetroxide at 25 degrees celsius and allowed to reach equilibrium.when equilibrium is established, the partial pressure of NO2 has decreased by 1.24 atm. (a) what are the partial pressures of NO2 ...
Tuesday, September 15, 2015 by Aisk

CHEMISTRY
If a solution is made by dissolving 15g of each solid in the same 100g of water at 70 degrees and the solution is cooled to 20 degrees, crystals are observed.. Which solid crystallises and explain in reference to both solids
Tuesday, September 15, 2015 by Gabrielle M

chemistry
a certain hydrocarbon has the analysis C=85.84% and H=14.16%. the density of its vapour is 2.50g/L at STP. find the empirical and molecular formula.
Tuesday, September 15, 2015 by trinaa

Chemistry
Calculate the enthalpy change (ΔH) for: HCl(aq) + NH3(aq) → NH4Cl(aq) The reaction of 50.0 mL of 1.00 M HCl with 50.0 mL of 1.00 M NH3 causes a temperature rise of 6.4 ˚C in the resulting 100.0 mL of solution. The NH4Cl solution has a density of 1.005 g/mL and ...
Tuesday, September 15, 2015 by Jim

Chemistry
The number of moles and the mass of oxygen formed by the decomposition of 1.252 g of mercury(II) oxide. I don't understand how to solve this, just want someone to explain. Thank you!
Tuesday, September 15, 2015 by Sarah

Chemistry
CaO +H2O= Ca(OH)2 The initial mass plus the test tube is 10.860g after picking up water to give calcium hydroxide the total mass of the tube and ca(oh)2 is 11.149g What is the mass of the test tube? ..I did 11.149-10.86=.289 h2o , 40.08/56.08=ca % 16/56.08=o% then I got lost...
Tuesday, September 15, 2015 by Alexis

Chemistry
1. What volume of nitric acid solution with mass fraction of 16% is required to make make 250ml solution with 0.2mole/l?
Tuesday, September 15, 2015 by Daniel

College Chemistry
When one mole of C6H6 is burned, 3.27 MJ of heat is produced. When the heat from burning 7.59 g of C6H6 is added to 5.69 kg of water at 21.0°C, what is the final temperature of the water?
Tuesday, September 15, 2015 by Angel

College Chemistry
A 43.70 g sample of a substance is initially at 24.7 °C. After absorbing 1757 J of heat, the temperature of the substance is 120.5 °C. What is the specific heat (c) of the substance?
Tuesday, September 15, 2015 by Angel

College Chemistry
The specific heat of a certain type of cooking oil is 1.75 cal/(g·°C). How much heat energy is needed to raise the temperature of 2.83 kg of this oil from 23 °C to 191 °C?
Tuesday, September 15, 2015 by Shannon

College Chemistry
When one mole of C6H6 is burned, 3.27 MJ of heat is produced. When the heat from burning 5.43 g of C6H6 is added to 5.69 kg of water at 21.0°C, what is the final temperature of the water?
Tuesday, September 15, 2015 by Shannon

Chemistry
How many grams of rust are produced from the oxidation of 10.0 lb of iron?
Tuesday, September 15, 2015 by John

Chemistry
How many grams of iron must be oxidized to produce 5.0g of rust? (Fe2O3) I have no idea how to solve this!
Tuesday, September 15, 2015 by John

chemistry
Describe the laboratory preparation of z1Litre of 1.3M formic acid buffer of pH 3.9 from solid sodium formats (molecular weight =68) and formic acid liquid 30% pure (Density of formic acid = 1.029g/ml, pKa = 3.75)
Tuesday, September 15, 2015 by Kingsley

Chemistry
When 1.63 g sample of an unknown hydrocarbon is completely burned in oxygen, 4.97 g of CO2 are produced. What is the percentage by mass of hydrogen in this hydrocarbon? THANK YOUU Found out the formula: 4CH+5O2--> 4CO2+2H2O then found out the moles of CH= 0.1251 I don't...
Monday, September 14, 2015 by Alex

CHEMISTRY
- If you have a properly adjusted hot flame, which is pale blue with three distinct cones, what is observed if the gas control valve is slightly closed? Explain. - If you have a properly adjusted hot flame, which is pale blue with three distinct cones, what is observed if the ...
Monday, September 14, 2015 by Armela

Organic Chemistry
I have already calculated the volume of ethyl alcohol need to dissolve 0.300 g of sulfanilamide at 78 degrees Celsius. I got 1.429 mL ethyl alcohol. My question is: how do I calculate how many grams of sulfanilamide will remain dissolved in the mother liquor (ethyl alcohol) ...
Monday, September 14, 2015 by Sasha

chemistry
Convert 15 ºF to degrees K. (Just type the number with correct sig figs, do worry about finding the degree symbol)
Monday, September 14, 2015 by Erica

chemistry
A tank holds 52.9 cm3 of water. What is the volume in in3? (2.54 cm=1 in, Remember significant figures, but this answer does not need units, since the answer must be in in3)
Monday, September 14, 2015 by Erica

chemistry
A student measure 9.43 mL of an unknown liquid in a graduated cylinder. The mass of the empty cylinder is 34.670 g, and the mass of the cylinder and liquid is 44.197 g. What is the density of the unknown liquid? (remember significant figures and units in your answer)
Monday, September 14, 2015 by Erica

chemistry
Convert 1.01 x 10-8 seconds to nanoseconds
Monday, September 14, 2015 by Erica

chemistry
How many inches are in 2.41 m? (2.54 cm = 1 inch, remember significant figures and units)
Monday, September 14, 2015 by Erica

Chemistry
The density of aluminum is 2.70 g/ml. What is the mass of a cube of Al that measures 2.20 cm on each side?(remember significant figures and to include the units of g in your answer, remember that 1 ml=1 cm3)
Monday, September 14, 2015 by Erica

Chemistry
How many grams of magnesium oxide could be formed from the reaction of .248g of magnesium metal?
Monday, September 14, 2015 by Dee

Chemistry
In one experiment, 7.62 g of Fe are allowed to react with 8.67 g of S. What is the limiting reagent, what is the mass of FeS formed, and how much excess reagent is left, respectively? I am not sure how to solve this. I started by doing (7.62 g Fe/55.85 g)=.137 g (8.67g S/32.07...
Monday, September 14, 2015 by Jorge

Chemistry
Calculate the amount of hydrochloric acid in 25cm3 of 0.100M HCl
Monday, September 14, 2015 by Jess

chemistry
a metal X that reacts with metal Y in a solution of Y but does not react with Z in a solution of Z means that ........
Monday, September 14, 2015 by Ms Joy

chemistry
What mass of protons would be required to just neutralize the charge of 1.1 g of electrons?
Monday, September 14, 2015 by jenny

algebra
A chemistry laboratory has supplies of two sulfuric acid solutions only. One is 10% concentrated and the other is 50% concentrated. How much of each solution should be mixed to make a 40 mL 25% sulfuric acid solution?
Monday, September 14, 2015 by Nica

chemistry
for the reaction H2+I2--2HI at a given temperature it was found that an equilibrium mixture in a 10mL container consisted of 8.0 mol of HI, 1.0 mol of H2 nd 1.0 mole of I2. what is the equilibrium constant at that temperature?
Monday, September 14, 2015 by kedi

Chemistry
How many kJ is released when 3.4 mol of water is frozen?
Monday, September 14, 2015 by Fatima

chemistry
Assume water boils at 100.0 C in Houston(near sea level) and at 90.0 C in Cripple Creek Colorado(near 9, 500 feet). If it takes 4.7 min to cook an egg in Cripple Creek and 4.4 min in Houston, what is Ea for this process? Enter your answer in scientific notation. Thanks.
Monday, September 14, 2015 by patrick

Chemistry
When 24.0 cal of heat is added to 18.5 g of aluminum at 19.0 ∘C, what is the final temperature of the aluminum?
Monday, September 14, 2015 by Christina

chemistry
The growth of Pseudomonas bacteria is modeled as a first-order process with K=0.035 min ^-1 at 37 degrees C. The initial Pseudomonas population density is 1.0 x 10^3 cells/L. Enter your answers in scientific notations. A) What is the population density after 4.0 h B) What is ...
Monday, September 14, 2015 by tatiana

chemistry
Assume water boils at 100.0 C in Houston(near sea level) and at 90.0 C in Cripple Creek Colorado(near 9, 500 feet). If it takes 4.7 min to cook an egg in Cripple Creek and 4.4 min in Houston, what is Ea for this process? Enter your answer in scientific notation. Thanks.
Monday, September 14, 2015 by patrick

chemistry
For the decomposition of gaseous dinitrogen pentoxide (shownbelow), 2 N2O5(g).....> 4NO2(g) + O2(g) the rate constant is k = 2.8 10-3 s-1 at 60°C. The initial concentration of N2O5 is 1.52 mol/L. (a) What is [N2O5] after 5.00 min? _____mol/L (b) What fraction of the ...
Sunday, September 13, 2015 by sabrina

Chemistry
Determine the Energy and n(i) for the spectral line at 121.6 nm (orange). Given: spectral line: 121.6 nm n(f) = 1 Find Energy and n(i)
Sunday, September 13, 2015 by Anonymous

chemistry
The rate constant of a reaction is 6.2 x 10^-3s-1 at 25 degrees C, and the activation energy is 33.6 KJ/mol.. What is k at 75 degrees C? Enter your answer in scientific notation.
Sunday, September 13, 2015 by ruby

Chemistry
In the reaction, PCl3 + Cl2 ------> PCl5 the concentration of the reactants at equilibrium were each determined to be 7.2 mol/L, and the product at 0.050 mol/L. Calculate the equilibrium constant (rounding to 2 significant figures and using scientific notation), and state ...
Sunday, September 13, 2015 by James

Chemistry
a 7.83g sample of hydrocyanic acid contains 0.290g and 4.06g of nitrogen. Find the mass of carbonin a sample of HCN with a mass of 3.37g.
Sunday, September 13, 2015 by Jordan

Chemistry
a 7.83g sample of hydrocyanic acid contains 0.290g and 4.06g of nitrogen. Find the mass of carbonin a sample of HCN with a mass of 3.37g.
Sunday, September 13, 2015 by Anonymous

chemistry
Le Chatelier's principle lab
Sunday, September 13, 2015 by Frank

Chemistry
Calculate the number of moles of carbon atoms present in 2.2 g of ethanol (C2H6O). For this question, I would just need to find the molar mass of carbon, right? Not the molar mass of all of ethanol? So it would just be 2.2 g/ 24.02 g/mol which would equal .092. It wouldn't...
Sunday, September 13, 2015 by Alex

Chemistry
Can I know the molarity of acid rain?
Sunday, September 13, 2015 by Jose

Chemistry (Check)
Q: Number of unpaired electrons in the nitrogen atom. A: 1s^2 2s^2 2p^6. 3 unpaired electrons in the p orbital Q: Number of 4d orbitals. A: 10 Q: Maximum number of electrons that can have n=3 and l=1. A: 1s^2 2s^2 2p^6 3s^2 3p^6. 2 electrons
Sunday, September 13, 2015 by Anonymous

Chemistry (Check)
Q: Identify all that is incorrect about the set of four quantum numbers and explain why. {-3, 2, 1, 1/2} A. -3 because there can't be a negative orbital. Q: Identify all that is incorrect about the set of four quantum numbers and explain why. { 3, 2, 1/2, 1/2} A. m(l) = 1/...
Sunday, September 13, 2015 by Anonymous

Chemistry (Check)
Q: Name the group that has a general electron configuration of ns^2 and provide an example of an atom with this general configuration. A: Alkaline Earth Metals and Beryllium [He] 2s^2 Q: Name the group that has a general electron configuration of ns^2np^6 and provide an ...
Sunday, September 13, 2015 by Anonymous

Chemistry
Determine the energy and n(i) for the spectral line at 121.6 nm (orange). Hint: R(H)=2.18x10^-18 J, c=3.0x10^8, and 1x10^9 nm - 1 m. Line, nm 121.6 E, J ___ n(f) 1 n(i) ___
Sunday, September 13, 2015 by Anonymous

Chemistry
What is the order of the reaction for the following reaction and for each reagent given? A + 2B + C --> productions Experiment / A / B / C / rate 1 / 0.002 / 0.15 / 0.132 / 0.0057 2 / 0.002 / 0.25 / 0.132 / 0.0158 3 / 0.003 / 0.15 / 0.132 / 0.0114 4 / 0.003 / 0.15 / 0.264...
Sunday, September 13, 2015 by Devin

Chemistry (Check)
The Lyman series. Of the four lines, 91.2nm, 97.2nm, 102.6 nm, and 121.6nm, which one has the A. Highest wavelength? _____ B. Highest energy? ______ C. Highest frequency?_(1)____ which equals__(2)____ My answers A. 91.2 B. 121.6 C. (1) 121.6 C. (2) energy
Sunday, September 13, 2015 by Anonymous

Physics
how are the fundamental laws and principles of physics related to the complexity that we see in nature? 2) How do the laws of physics apply to other sciences such ad biology, chemistry, and earth science? Give a specific example to show the connection - is it because there ...
Sunday, September 13, 2015 by anonymous

Chemistry
The equation for lowering the freezing point of a solvent is given in your manual. Given that the freezing point for the pure solvent is 79.4 °C , the molality is 0.1 m , and the freezing point depression constant is 6.9 °C/m , determine the freezing temperature for ...
Sunday, September 13, 2015 by Asia

chemistry
If a rectangular solid has a mass of 59.345 g and measures 10.05 cm by 5.20 cm by 1.25 cm, what is the density of the solid?
Saturday, September 12, 2015 by Dan

Chemistry Lab
Suppose that you used 0.75g of iron. What is the minimum volume of 1.5 M_ CuSO4 solution required Using eqn. (3-1)? and eqn. (3-2)? (3-1) Fe(s) + Cu^2+ (aq) ---- Fe^2 (aq)+ Cu (s) (3-2) 2Fe(s)+ 3Cu^2+(aq) --- 2Fe^3+ (aq) +3Cu (s)
Saturday, September 12, 2015 by Liza

Chemistry
Suppose that you used 0.75g of iron. What is the minimum volume of 1.5 M_ CuSO4 solution required Using eqn. (3-1)? and eqn. (3-2)?
Saturday, September 12, 2015 by Liza

Chemistry
If an aquarium tank holds 100 litres of water, calculate how much heat energy would be required to heat the tank from 18.2 Degrees(C) to 32 Degrees(C)
Friday, September 11, 2015 by Samuel

chemistry
Hi! Can you please check if my answers are correct? And, can you please tell me any other details you think are important to add. Also, the last two questions i have no clue how to answer. can you help? thanks so much! 3.A burning candle produces a luminous flame. What is the ...
Friday, September 11, 2015 by anna

chemistry
how many kilojoules of energy are required to bring 800.0g water from 20.0c to the boiling point. not sure what formula is? 4.184j
Friday, September 11, 2015 by melissa

Chemistry
To what decimal place should each answer be rounded? and how many significant figures does the rounded answer have? a) 9cm + 2.8 cm= 11.8cm (unrounded) b) 0.135 atm + 0.6 atm= 0.735 atm (unrounded) PLEASE HELP
Friday, September 11, 2015 by Albert

Chemistry
An empty gas cylinder of 40L is to be filled with air (ideal gas) to 5000psia and 25C. The gas cylinder is being filled by a pump that increases its flow by 20 moles per minutes after turned on. How long will it take the pump to fill the tank? My work: 1st- I converted units ...
Friday, September 11, 2015 by Peb015

chemistry
Given that a 0.160 M HCl(aq) solution costs $39.95 for 500 mL , and that KCl costs $10/ton, which analysis procedure is more cost-effective?
Friday, September 11, 2015 by madie

Chemistry
Follow up question: Explain why the reaction of aluminum metal with aqueous sulfuric acid solution has very nearly the same ΔH value as the reaction between aluminum metal and HCl? Consider the atomic level. All I have is that they have the same net ionic equations. The ...
Thursday, September 10, 2015 by Jim

Chemistry URGENT!
If the reaction of 0.500 grams of aluminum metal with excess aqueous HCl releases 9.72 kJ of heat, what is the ΔH value for the reaction? 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g) All I have is: .500gAl*(1 mol Al/26.98gAl) Please and thank you so much!
Thursday, September 10, 2015 by Jim

Chemistry VERY URGENT PLEASE
What does the chemical formula, MgSO4 * 7H2O, become when the hydrated is heated? I got so far is MSO4 * 7H2O + Heat ---> MgSO4 + H + O
Thursday, September 10, 2015 by Finn

Chemistry
Which of these mixtures are heterogenous? - granite - brass - oil and water - salt and water can you please explain this to me?
Thursday, September 10, 2015 by Amy

Chemistry
0.00267m= how many nm? please show me how to set this up. thanks!
Thursday, September 10, 2015 by Amy

Chemistry
Hi! I am having some trouble with this question, can you please help me? Which of the following describe chemical properties? Check all that apply. - Iodine (a purple solid) becomes a purple gas. - Titanium is less dense that iron . - Water freezes at 0'C - Sugar burns in ...
Thursday, September 10, 2015 by Kris

Chemistry
Round each number to two significant figures: 233.356 0.002353 1.005 Can you please show me and explain how to do this? Im confused. thank you!!!
Thursday, September 10, 2015 by Alex

general chemistry
How many oxygen atoms are in 3.90 g of quartz?
Thursday, September 10, 2015 by Lyndsay

chemistry
3A+2B+2C > 4D+2E 1) what is the rate of this reaction in terms of change of concentration of reactant B? - is it '1/2' ? 2) what is the rate of this reaction in terms of change of concentration of product D? please help
Thursday, September 10, 2015 by Bobby

AP Chemistry
Please show me how to do this step by step I would appreciate it We add excess Na2CrO4 solution to 42.0 mL of a solution of silver nitrate (AgNO3) to form insoluble solid Ag2CrO4. When it has been dried and weighed, the mass of Ag2CrO4 is found to be 0.520 grams. What is the ...
Thursday, September 10, 2015 by Hannah

Chemistry
please show me step by step how to do this so i can figure out the rest We add excess Na2CrO4 solution to 42.0 mL of a solution of silver nitrate (AgNO3) to form insoluble solid Ag2CrO4. When it has been dried and weighed, the mass of Ag2CrO4 is found to be 0.520 grams. What ...
Wednesday, September 9, 2015 by Hannah

Chemistry
Hi! I really really need help in this question: what observation is expected when: 1. an acid (nitric acid, HNO3) is added to a solution containing carbonate or bicarbonate ions? 2. silver ion is added to a solution containing chloride (or bromide or iodide) ions? Please help ...
Wednesday, September 9, 2015 by Alex

Chemistry 2
36.) Suppose a chemistry student discoveres that a block of pure ice is left on her porch as she goes to school one day. What will be the percent composition of the pure ice block?
Wednesday, September 9, 2015 by Sam

chemistry
An experiment was conducted in which many pieces of data were collected. Considering all of the data, the limiting number of significant figures in the experiment was 3 significant figures. One of the values needed in these calculations was the barometric pressure. It was ...
Wednesday, September 9, 2015 by Jas

Chemistry- PLEASE HELP
Hi! I really really need help in this question: what observation is expected when: 1. an acid (nitric acid, HNO3) is added to a solution containing carbonate or bicarbonate ions? 2. silver ion is added to a solution containing chloride (or bromide or iodide) ions? Please help ...
Wednesday, September 9, 2015 by Alex

CHEMISTRY
Hello there! I was wondering if you could check my answers for me? I was having trouble and I finally understand. 1. Indicate the oxidation number of carbon and sulfur in the following compounds. A) CO= +2 C) Na2CO3= +4 E) CH4= -4 G) SO2= +4 I) Na2SO4= +6 K) Na2S303= +2 M) ...
Wednesday, September 9, 2015 by Isabella

Chemistry
How do I calculate the molar mass of the following: Na2SO4.10 H2O(s) CaSO4.2H2O(s)
Wednesday, September 9, 2015 by Anonymous

Chemistry
O5F2 Express your answer using two decimal places. I got 118, but when I rounded it to 120 and made it 1.2*10^1, it said I was wrong. What did I do wrong?
Wednesday, September 9, 2015 by Finn

Chemistry
Hi! I am totally stuck on this question: Explain why a cool flame is important to use in heating a solution to dryness. Can you please explain to me exactly why because I really do not understand. thank you!
Wednesday, September 9, 2015 by Abigail

Chemistry
Hello there! I was wondering if you could check my answers for me? I was having trouble and I finally understand. 1. Indicate the oxidation number of carbon and sulfur in the following compounds. A) CO= +2 C) Na2CO3= +4 E) CH4= -4 G) SO2= +4 I) Na2SO4= +6 K) Na2S303= +2 M) ...
Wednesday, September 9, 2015 by Isabella

Chemistry
One of the reactions that occurs in a blast furnace, in which iron ore is converted to cast iron, is Fe2O3 + 3CO → 2Fe + 3CO2 Suppose that 1.59 × 103 kg of Fe is obtained from a 2.54 × 103 kg sample of Fe2O3. Assuming that the reaction goes to completion, ...
Wednesday, September 9, 2015 by Helga

Chemistry
A solution of ammonia and water contains 3.70×1025 water molecules and 7.10×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
Wednesday, September 9, 2015 by Mel

Chemistry
You leave 255 grams of water outside at 21.0 C in the sun. After 30.0 minutes the temperature is 35.0 C. A) how many calories of energy was used by the sun to heat the water up? B) how many joules of energy is this? C) How many Joules / second of power did the sun provide? (...
Wednesday, September 9, 2015 by Vic

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