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October 24, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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CHEMISTRY
Hi! I know I asked this before, but I still don't understand how to solve the problem:"Since a hydrogen atom consists of one proton and one electron, it should have a mass of 1.763 x 10^-24 grams. Using unit factoring, calculate how may hydrogen atoms you'd have ...
Thursday, September 18, 2014 at 9:54pm

chemistry
state the chemical formula of phthalic acid and calculate the molar mass using the formula.
Thursday, September 18, 2014 at 6:05pm

chemistry
A 15.27 g sample of Mo2O3(s) is converted completely to another molybdenum oxide by adding oxygen. The new oxide has a mass of 18.33 g. Add subscripts below to correctly identify the empirical formula of the new oxide.
Thursday, September 18, 2014 at 4:41pm

Chemistry
What is the molarity of HCL if it takes 16.5 mL of 0.100 M NaOH to titrate 10.0 mL of HCl? HCl + NaOH -> H2O + NaCl molarity = moles of solute/liters of solution
Thursday, September 18, 2014 at 4:08pm

general chemistry I
Calculate the percentage error arising in an experiment if 1-mL, 5-mL, and 10-mL pipets are used for transfer and each pipet contains 5 drops of water adhering to the inside of the barrel. A single drop of water has an approximate volume of 0.05 mL.
Thursday, September 18, 2014 at 4:04pm

chemistry
Silicon for computer chips is grown in large cylinders called “boules” that are 300 mm in diameter and 2 m in length,as shown.(Figure 1) The density of silicon is 2.33 g/cm3. Silicon wafers for making integrated circuits are sliced from a 2.0 m boule and are ...
Thursday, September 18, 2014 at 12:32pm

chemistry
Silicon for computer chips is grown in large cylinders called “boules” that are 300 mm in diameter and 2 m in length,as shown.(Figure 1) The density of silicon is 2.33 g/cm3. Silicon wafers for making integrated circuits are sliced from a 2.0 m boule and are ...
Thursday, September 18, 2014 at 12:26pm

Chemistry
Since a hydrogen atom consists of one proton and one electron, it should have a mass of 1.763 x 10^-24 grams. Using unit factoring, calculate how may hydrogen atoms you'd have if you had 5.6 g of hydrogen. Thank you!
Thursday, September 18, 2014 at 9:46am

science, chemistry
Calculate the number of moles inside a soap bubble 1cm in diameter and 1atm pressure at a temperature of 25 degree celcious.
Thursday, September 18, 2014 at 8:05am

chemistry
How many grams of ammonia is formed when 8 g of nitrogen is reacted with 10 g of hydrogen
Thursday, September 18, 2014 at 8:01am

Chemistry
How could you prove that sodium hydroxide is a base without using litmus papes to test? Give an equation for the reaction
Thursday, September 18, 2014 at 5:39am

chemistry
How much benzoic acid is still dissolved when 73.53 mL of saturated boiling water is cooled to 20oC. The solubility at 20oC is 0.029g/10mL.
Wednesday, September 17, 2014 at 10:37pm

Chemistry
1. What does adding a salt like KCL do to the pH of a solution? 2. What does adding a base like KOH do to the pH of a solution
Wednesday, September 17, 2014 at 10:30pm

AP Chemistry
Form 300 mL of 0.25 M Copper 2 sulfate pentahydrate
Wednesday, September 17, 2014 at 9:16pm

chemistry
1a) why is it advisable to prepare a slightly more conc. soln. of kMnO4 when preparing its standard solution? b) what else do u have to do? (2). what will happen if NH4Cl is used to standardized the KMnO4. (3a). A student noticed traces of brown deposit during the KMnO4 to (...
Wednesday, September 17, 2014 at 3:18pm

CHEMISTRY
What is the molality of 22.5 g acetone (CH3)2CO , in 200 g water ? ( the answer is 22.0 m , that I think is wrong .. )
Wednesday, September 17, 2014 at 10:43am

chemistry
The solubility of acetanilide is 18.5 g in 100 mL of methanol at 0 °C, and 59.2 g in 100 mL of methanol at 60 °C. What is the maximum percent recovery that can be achieved for the recrystallization of acetanilide from methanol?
Wednesday, September 17, 2014 at 7:56am

chemistry
I have 3 grams of CaCI2 and dissolve this into 0.5 L water. What is the concentration in g/dl (grams/deciliter)? I take 10 milliliters of this solution and add it to 990 milliliters of watet fo a total of 1000 milliliters. What is the concentration of this new dilution in ...
Wednesday, September 17, 2014 at 12:47am

chemistry
A small quantity of hydrochloric acid and a large quantity of limestone chips (CaCO3) are reacted on a beaker, which was placed on the pan of a balance. The mass of the beaker and its contents were recorded every half minute. (a) Write a chemical equation to show the reaction ...
Tuesday, September 16, 2014 at 9:40pm

chemistry
the temperature of a substance ____ as its heat of fusion is added to melt the substance A. increases B. decreases C. remains constant D. fluctuates from rapid increases and decreases I think it's C
Tuesday, September 16, 2014 at 7:34pm

Chemistry
What is the molar number of PbI2
Tuesday, September 16, 2014 at 7:14pm

chemistry
the maximum speed recorded for a giant tortoise is 0.11 m/sec. How many miles could a giant tortoise travel in 5.0 hrs?
Tuesday, September 16, 2014 at 7:13pm

Chemistry
Find the theoretical and actual yield of 25.0g Pb(NO3)2+15.0g2NaI=PbI2+2Na(NO2)
Tuesday, September 16, 2014 at 6:37pm

Chemistry
To drain a round swimming pool that is 18.0 ft wide and 3.75 ft deep, a worker uses a pump that can move 7.58 gallons of water per minute. how many minutes will it take to drain the swimming pool?
Tuesday, September 16, 2014 at 6:22pm

Chemistry
A runner's average stride length is 41 inches. She takes 28 strides in 10.0 seconds. How many minutes does it take her to run 5.0 km?
Tuesday, September 16, 2014 at 6:15pm

Chemistry Urgent Help Please!
Give two means other than crystallization from a solvent that may be used to purify an organic solid. Explain Pleaseeeee!!!!!!!!!!!!!
Tuesday, September 16, 2014 at 5:56pm

chemistry
does the amount of rainy days in a month affect number of mosquitoes iv: amount of rainy days dv: number of mosquito
Tuesday, September 16, 2014 at 5:45pm

chemistry
Suppose you were instructed to prepare 100. g of 14.5% CaCl2 solution, you would need Blank 1 g of CaCl2 and Blank 2 g of water.
Tuesday, September 16, 2014 at 4:02pm

chemistry
What mass of propane (C3H8) is needed to produce 346g carbon dioxide in the following reaction? C3H8(g)+5O2(g)---> 3CO2(g) +4H2O(g) A. 115g C3H8 B. 1.86g C3H8 C. 5075g C3H8 D. 346g C3H8
Tuesday, September 16, 2014 at 3:59pm

chemistry
What is the difference between two bunsen burner experiments?
Tuesday, September 16, 2014 at 2:56pm

chemistry
Calculate the pH and pOH of each of the following aqueous solutions of strong acd or base: (a) 0.010 M HNO3(aq) (b) ) 1.0 x 10-3M Ba(OH)2(aq) (c) 10.0 mL of 0.22M KOH(aq) after dilution to 250 mL (d) 100 mL aqueous solution containing 050 g of Ba(OH)2 (aq)
Tuesday, September 16, 2014 at 2:44pm

chemistry
25. Which of the two reactions, A or B is a neutralization reaction? Explain why. A. HBr + H2O = Br- = H3O+ B. HClO + NaOH = NaClO + H2O 26. A. Look at the reaction again. when this reaction is reversed. Br- + H3O+ = HBr = H2O what substance is the acid, what is the base. B. ...
Tuesday, September 16, 2014 at 8:15am

Organic Chemistry
Label each reactant according to it role or roles in the chemical reaction? Two different (OH-) + (HBr) ----> (HOH) + (Br-) (OH-) + (H3CBr) ----> (H3COH) +(Br-) Lewis base, bronsted base, nucleophile, lewis acid, bronsted acid, nucleophile
Monday, September 15, 2014 at 10:49pm

Chemistry 400/ Chem 1A
A chemist mixes 5.216 g of potassium permanganate, 2.318 g of ethanol, and excess sulfuric acid. These chemicals react as follows: 4 KMnO4 + 5 C2H5OH + 6 H2SO4 ---> 4 MnSO4 + 5 CH3COOH + 2 K2SO4 + 11 H20 What mass of sulfuric acid is consumed in this reaction, assuming that...
Monday, September 15, 2014 at 10:33pm

Intro to chemistry
a salt solution has a density of 1.15 g/mL and a volume of 0.425L. what is the mass in kg of this solution? I just need to know how to do it period
Monday, September 15, 2014 at 9:45pm

Chemistry
1. Aluminum reacts with oxygen to produce aluminum oxide which can be used as an adsorbent, desiccant or catalyst for organic reactions. 4Al(s) + 3O2(g) → 2Al2O3(s) A mixture of 82.49 g of aluminum ( Picture = 26.98 g/mol) and 117.65 g of oxygen ( Picture = 32.00 g/mol) ...
Monday, September 15, 2014 at 8:34pm

chemistry
Three solutions 56.0 mL of 0.2 M KNO3; 57.0 mL of 0.6 M Ca(NO3)2; and 57.0 mL of 0.325 M KCl were poured together to make one new solution. What is the concentration of Cl− after mixing?
Monday, September 15, 2014 at 8:34pm

Chemistry
a) Ammonia, an important source of fixed nitrogen that can be metabolized by plants, is produced using the Haber process in which nitrogen and hydrogen combine. N2(g) + 3H2(g) → 2NH3(g) How many grams of nitrogen are needed to produce 325 grams of ammonia? b)A 0.00100 ...
Monday, September 15, 2014 at 8:33pm

chemistry
which of the following is true regarding the inner transition elements? A. their valence electrons can be located in both s and f sublevels B. They occupy the d block of the periodic table C. These include the lanthanides and actinides and do not have f sublevels chemistry D. ...
Monday, September 15, 2014 at 8:02pm

chemistry
If 125 cal of heat is applied to a 60.0-g piece of copper at 23.0∘C , what will the final temperature be? The specific heat of copper is 0.0920 cal/(g⋅∘C) .
Monday, September 15, 2014 at 7:45pm

chemistry
A hypothetical element has three main iso- topes with mass numbers of 81, 83, and 84. If 17.00% of the isotopes have a mass number of 81 amu and 35.00% of the isotopes have a mass of 83 amu, what atomic weight should be listed on the periodic table for this element?
Monday, September 15, 2014 at 6:25pm

chemistry
A hypothetical pure element consists entirely of two isotopes. The natural percent abun- dance of theisotopewithmass 25.4 uis 82.6%. The other isotope has mass 29.5 u. Calculate the atomic weight of the naturally occurring element.
Monday, September 15, 2014 at 6:20pm

Organic Chemistry
Consider the resonance structures for the carbonate ion. O--C-O(-) l O(-) (-)O-C--O l O(-) (-)O-C-O(-) l l O How much negative charge is on each oxygen of the carbonate ion? A)0, B) -.33, C)-.50, D) -.67, E)-1.00, F)-1.33, G)-1.50, H)-1.67, I)-2.00 What is the bond order of ...
Monday, September 15, 2014 at 5:28pm

chemistry
kilojoules released when 80.0g of steam condenses at 100 ∘C and to cool the liquid and freeze it at 0 ∘C I used the formula for condensation/ evaporation( 80.0g(2260)1kJ/1000J=632.8) and then i used the formula for heat of fusion(80.0g(334/1)1kJ/1000J=26.72) then ...
Monday, September 15, 2014 at 5:20pm

chemistry
What type of reaction does the following equation represent? AgNO3 + NaCl ---> AgCl + NaNO3 A. Single-displacement reaction B. Synthesis C. Combustion D. Double-displacement reaction
Monday, September 15, 2014 at 5:05pm

chemistry
Please identify the acid and the base in this equation. HClO + NaOH = NaClO + H2O Thank you!
Monday, September 15, 2014 at 4:39pm

chemistry
A Biology student wants to know if Mountain Dew will make plants grow faster than water. As a Chemistry student, you have agreed to assist in the planning of the experiment to make sure the student designs a valid experiment. 1) What is the experimental question? 2) What is ...
Monday, September 15, 2014 at 3:33pm

Chemistry
A 100-watt lightbulb radiates energy at a rate of 100 J/s (The watt, a unit of power, or energy over time, is defined as 1 J/s). If all of the light emitted has a wavelength of 500nm, how many photons are emitted per second? (Assume three significant figures in this calculation.)
Monday, September 15, 2014 at 3:25pm

Chemistry
A laser produces 15.0mW of light. In 3.00hr , the laser emits 4.53×1020 photons. What is the wavelength of the laser?
Monday, September 15, 2014 at 3:23pm

Chemistry
A proton in a linear accelerator has a de Broglie wavelength of 115pm. What is the speed of the proton?
Monday, September 15, 2014 at 3:22pm

Chemistry
An electron has an uncertainty in its position of 611pm. What is the uncertainty in its velocity?
Monday, September 15, 2014 at 3:21pm

Chemistry: Please Help!!
39. Explain why sweating cools you down in terms of molecular kinetic energy. 40. You take a pizza out of the oven and let it cool briefly. When you bite into it, the crust is not too hot but the cheese burns your mouth. Explain why this happens in terms of specific heat ...
Monday, September 15, 2014 at 3:08pm

Chemistry: Please Help!!
37. Lake Michigan is a very large, very deep body of water, located in a region of the United States that gets quite cold in winter. On the coldest day of last year, what was the temperature at the bottom of the lake. Explain your answer in terms of density of water. 38. ...
Monday, September 15, 2014 at 3:05pm

Chemistry
B. Could non-polar nitrogen molecules and polar water molecules form bonds with one another? if so, what kind? C. Given your answer to B above, do you think that there is a great deal of N2 dissolved in the oceans, a small amount, or none at all?
Monday, September 15, 2014 at 2:52pm

Chemistry
At 27 degrees celcius, nitrogen has a volume of 650 cm^3 under a pressure of 980 mmHg. What would be its volume at the same temperature but at a pressure of 760 mmHg?
Monday, September 15, 2014 at 2:52pm

Pure Chemistry
At 27 degrees celcius, nitrogen has a volume of 650cm^3 under a pressure of 980mmHg. What would be its volume at the same temperature but at a pressure of 760mmhg ?
Monday, September 15, 2014 at 2:04pm

chemistry
If an irregular object displaces 10mL of water within a graduated cylinder and its density is known as 2.5 g/mL. What is the mass of the object?
Monday, September 15, 2014 at 1:22pm

chemistry
Nickel is about 2 millimeter thick or 2/1000 of a meter.how many nanometer is this?
Monday, September 15, 2014 at 1:18pm

Chemistry
Diluting and dissolving of potassium nitrate is very endothermic.Suggest what would be observed to the temperature if 2.0g of the salt is added to 2cm3 of water.
Monday, September 15, 2014 at 12:29pm

chemistry
The observation for three materials shows: Material A absorbs all the visible light (opaque) Material B is transparent to all the visible light (transparent) Material C absorbs blue light but is transparent to red light. (Blue light has wavelength 0.4 m, red light has ...
Monday, September 15, 2014 at 10:47am

Chemistry
How much heat will be released when 0.750 moles of carbon monoxide (CO) react in an excess of oxygen gas? 2CO(g) + O2(g) ¨ 2CO2(g) + 566 kJ
Monday, September 15, 2014 at 9:57am

chemistry 1045L
The volume of a sphere is given by V=(4)(3.14)(r^3)/3 where r is the radius of the sphere. what is the density in g/mL of a sphere which weighs 2.00lb and has a radius of 3.50 inches?
Monday, September 15, 2014 at 9:34am

chemistry
how much copper sulphate will require saturating 80 grams of water at 20 degree celcious .if solubility of copper sulphate at 20degree celcious is 25?
Monday, September 15, 2014 at 8:34am

Chemistry
How do we do charge balance and mass balance? Plz give me an answer on a general basis so that i can do it for any compound i get. Thanks
Monday, September 15, 2014 at 2:46am

chemistry
If it costs $3.92 for a gallon of gas, and I fill up with 13.5 gallons once each 1.5 weeks, how much am I spending on gas in a 5 week month?
Sunday, September 14, 2014 at 10:36pm

chemistry
How many grams of Cu (s) are needed to form 6.00g Ag from a solution of AgNO3? The reaction is Cu (s)+2Ag^+(ag)--> Cu^2+(aq)+2Ag (s) the molar masses are: Ag=107.868 and Cu=63.546g
Sunday, September 14, 2014 at 10:33pm

Chemistry
If the edge length of an NaH unit cell is 488pm, what is the length (in picometers) of an Na−H bond? Na−H has face-centered cubic unit cell. Please help
Sunday, September 14, 2014 at 7:44pm

Chemistry
An element crystallizes in a body-centered cubic lattice. The edge of the unit cell is 3.13Å , and the density of the crystal is 7.78g/cm3. Calculate the atomic weight of the element. Please help, thanks
Sunday, September 14, 2014 at 7:41pm

chemistry
For the decompostion of gaseous dinitrogen pentaoxide, 2N2O5(g)--->4NO2(g) +O2(g) . The rate constant is k=2.8 x 10^-3 at 60 degrees C. The initial concentration of N2O5 is 2.45 mol/L. What is (N2o5) after 5.00 min? What fraction of the N2o5 has decomposed after 5 min?
Sunday, September 14, 2014 at 7:30pm

chemistry
By what factor does the fraction of collisions with energy equal to or greater than activation energy at 100 kJ/mol. change if the temperature increases from 32 degrees celsius to 63 degrees celsius. Give your answer in SCIENTIFIC NOTATION
Sunday, September 14, 2014 at 7:29pm

College Chemistry
how many liters of ethanol contain 1.5 kg of ethonal?
Sunday, September 14, 2014 at 7:29pm

Chemistry Urgent Help and Check Please!
a) You use 100 ml ethylchloride (density 0.92 g/ml) to extract 25 ml ethylene bromohydrin (density 2.41 g/ml) mixed with 100 ml. Is the aqueous layer the lower or the upper layer. How could you easily test this. ----- Ethylchloride is less dense so it is the top layer Ethylene...
Sunday, September 14, 2014 at 7:06pm

chemistry
2 HI(g)--><--H2(g) + I2(g) When a sufficiently large sample of HI(g) is introduced into an evacuated vessel at 643 K, the equilibrium concentration of I2(g) is found to be 0.248 M. Calculate the concentration of HI in the equilibrium mixture. M. Please help! I have no ...
Sunday, September 14, 2014 at 6:24pm

Chemistry
What is 100mL of water + 45.00g of ice?
Sunday, September 14, 2014 at 5:14pm

chemistry
Calculate the following quantity: Volume in mL of 21.4 M cobalt(II) chloride solution that must be diluted with water to prepare 17 mL of an 51.5 M solution. Calculate to 0 decimal places and do not include units. Also, do NOT use scientific notation.
Sunday, September 14, 2014 at 5:12pm

chemistry
Discuss the difference in lattice enthalpy between NaCl and CsF
Sunday, September 14, 2014 at 5:02pm

chemistry
The temperature of a substance ____ as its heat of fusion is added to melt the substance A. increases B. decreases C. remains constant D. fluctuates from rapid increases and decreases
Sunday, September 14, 2014 at 3:51pm

chemistry
According to Boyle, pressure and volume of a confined gas are ____ proportional, and according to Charles, the volume of a gas at a constant pressure is____ proportional to its Kelvin temperature. A. directly; inversely B. directly; not C. inversely; directly D. not; inversely
Sunday, September 14, 2014 at 3:44pm

chemistry
What is the molecular mass of potassium hydrogen carbonate (KHCO3)? A. 110g/mol B. 84g/mol C. 68g/mol D. 116g/mol
Sunday, September 14, 2014 at 3:16pm

chemistry
What mass of sulfur has to burn to produce 4.5L SO2 at 300°C and 101 kPa in the following reaction? S(s) + O2(g) -> SO2(g) A. 3.07 g S B. 41.0 g S C. 13.5 g S D. 68.8 g S
Sunday, September 14, 2014 at 3:03pm

chemistry
What mass of sulfur has to burn to produce 4.5L SO2 at 300°C and 101 kPa in the following reaction? S(s) + O2(g) -> SO2(g) A. 3.07 g S B. 41.0 g S C. 13.5 g S D. 68.8 g S
Sunday, September 14, 2014 at 3:03pm

Chemistry Urgent Help Please!
If caffeine is soluble in hot benzene but insoluble in hot petroleum ether, how could you use this information to design a crystallization procedure?
Sunday, September 14, 2014 at 1:51pm

chemistry
The observation for three materials shows: Material A absorbs all the visible light (opaque) Material B is transparent to all the visible light (transparent) Material C absorbs blue light but is transparent to red light. (Blue light has wavelength 0.4 m, red light has ...
Sunday, September 14, 2014 at 12:30pm

Chemistry
If 64.0 g of H2O are actually obtained, find the actual yield %. Show that the % the same whether you calculate using grams or moles. Theoretical yield is 4.04 moles and in grams is 72.80 grams 2H2 + 1O2=2H2O
Sunday, September 14, 2014 at 12:20pm

Chemistry
Suppose the atomic mass unit had been defined as 1/10 th of the average mass of an atom of phosphorus. What would the atomic mass of Carbon be on this scale. What would Avogadro's number be?
Sunday, September 14, 2014 at 9:22am

Chemistry Urgent Help Please!
You use 100 ml ethylchloride (density 0.92 g/ml) to extract 25 ml ethylene bromohydrin (density 2.41 g/ml) mixed with 100 ml. Is the aqueous layer the lower or the upper layer. How could you easily test this. You dissolve sodium chloride 40g. in the above mixture. Assuming the...
Sunday, September 14, 2014 at 1:05am

Chemistry
What is the velocity of an electron that has a de Broglie wavelength approximately the length of a chemical bond? Assume this length to be 2.5×10−10m .
Saturday, September 13, 2014 at 11:57pm

chemistry
suggest an alternative indicator for the standardization reaction. Explain the rationale behind your choice.
Saturday, September 13, 2014 at 11:22pm

Chemistry
A metal bar having a mass of 212 g is heated to 125.0°C and then dropped into 375 g of water at 24°C. After a while the temperature of the water and the metal is 34.2°C. If the specific heat of the metal is 0.831 J/g°C, how much heat did the metal lose? Please ...
Saturday, September 13, 2014 at 9:42pm

Chemistry
4. Suppose there are 72.0 g of O2 available, along with the 8.08 grams of H2. Use ratios of stoichiometric coefficients to find the limiting reagent for the reaction. Then, find the theoretical yield in both moles and grams. 2H2 + 1O2 à 2H2O I got 2.25 grams for o2 Then...
Saturday, September 13, 2014 at 9:10pm

chemistry
Which element's atomic radius changes the most in size when it becomes ionized? A. Fluorine B. Lithium C. Sodium D. Chlorine
Saturday, September 13, 2014 at 8:30pm

Chemistry
For the reaction 2H2 + 1O2 à 2H2O, there are 8.08 grams of H2 available. 2. Use the ratio of stoichiometric coefficients in the reaction above to determine how many moles of H2O can be produced from the H2 available. Then, use molar mass to convert the moles of H2O into...
Saturday, September 13, 2014 at 8:26pm

chemistry
Covalent bonding (with an electronegativity difference below 0.5) results when fluorine bonds with A. hydrogen B. potassium C. iodine D. fluorine
Saturday, September 13, 2014 at 8:19pm

chemistry
What is the electronegativity difference for a bond between potassium and iodine? A. 3.3 B. 0.4 C. 4.6 D.1.7
Saturday, September 13, 2014 at 8:15pm

chemistry
Which of the following is true? A. Group 1 elements are more reactive than the group 2 elements because they have more valence to lose. B.Lithium is the least reactive element in group, because its valence electron is held more tightly than the others in the same group. C. ...
Saturday, September 13, 2014 at 8:04pm

chemistry
What type of reaction does the following equation represent? AgNO3 + NaCl ---> AgCl + NaNO3 A. Single-displacement reaction B. Synthesis C. Combustion D. Double-displacement reaction
Saturday, September 13, 2014 at 7:50pm

chemistry
What type of reaction does the following equation represent? AgNO3 + NaCl ---> AgCl + NaNO3 A. Single-displacement reaction B. Synthesis C. Combustion D. Double-displacement reaction
Saturday, September 13, 2014 at 7:50pm

chemistry
What type of reaction does the following equation represent? AgNO3 + NaCl ---> AgCl + NaNO3 A. Single-displacement reaction B. Synthesis C. Combustion D. Double-displacement reaction
Saturday, September 13, 2014 at 7:50pm

chemistry
The ionic radii of Na+ (atomic weight 22.99) and Cl- (atomic weight 35.45) are 1.0 and 1.8 Angstrom, respectively. Treating the ions as hard spheres, calculate the density of NaCl. Compare this with the measured density of 2.17 g/cm3.
Saturday, September 13, 2014 at 7:48pm

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 ...
Saturday, September 13, 2014 at 7:39pm

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