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September 21, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
Calculate the volume in liters of a M copper(II) sulfate solution that contains of copper(II) sulfate . Round your answer to significant digits.
Sunday, September 21, 2014 at 3:13pm

Chemistry
Given: Cu2O(s) + 1/2 O2(g) → 2CuO(s) deltaH°= -144 kJ 2Cu2O(s) → 2Cu(s) + 2CuO(s) deltaH°= 22 kJ Calculate the standard enthalpy of formation of CuO(s).
Sunday, September 21, 2014 at 3:09pm

Chemistry Lab MgO
If in Part B.2, the burning of the magnesium is uncontrolled (burns brightly), how will this procedural error affect the reported mass of: a Magnesium in the magnesium oxide? Explain. B. oxygen in the magnesium oxide? Explain.
Sunday, September 21, 2014 at 3:07pm

Chemistry
Hydrogen cyanide is produced in the following balanced reaction. 2NH3 (g) + 3O2 (g) + 2CH4 (g) → 2HCN (g) + 6H2O (g) Given the following standard heats of formation, calculate the approximate ΔH°rxn of this reaction. Substance ΔHf°(kJ/mol) NH3 -46 CH4 -...
Sunday, September 21, 2014 at 2:38pm

Chemistry
The student wanted to be sure he had made Calcium Oxide. He crushed some heated limestone and added water. The mixture got hot. The student cooled the mixture and filtered it. This gave a colourless solution and a white solid that was left in the filter paper. The student ...
Sunday, September 21, 2014 at 2:32pm

chemistry of solutions
NaI(aq)+Hg2(C2H3O2)2(aq)→
Sunday, September 21, 2014 at 1:58pm

chemistry
At 25∘C the reaction from Part A has a composition as shown in the table below. Substance Pressure (atm) C2H2(g) 4.65 H2(g) 3.85 C2H6(g) 5.25×10−2 What is the free energy change, ΔG, in kilojoules for the reaction under these conditions?
Sunday, September 21, 2014 at 12:53pm

chemistry
What is the density of a piece of zinc that has a volume of 8000 cubic cm? density= mass/ volume
Sunday, September 21, 2014 at 12:49pm

Chemistry Need help ASAP
A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
Sunday, September 21, 2014 at 12:38pm

chemistry
write half reaction for KMnO4 and (COMM)2 and balance the equation.calculate the atomic mass of M in14.0g/dm3 of solution
Sunday, September 21, 2014 at 12:04pm

chemistry
how many grams of HCL are consumed in the reaction of 378 grams of a mixture containing 18.2 % MgCO3 and 81.1% MgOH2 by mass
Sunday, September 21, 2014 at 11:00am

Chemistry (Ionic Equilibria)
When a WEAK acid can be said to be weak, and when a WEAK acid can be said to be strong? I only know the difference between weak acids and strong acids, but i dont know that even weak acids can be classified as weak and strong. Plz help
Sunday, September 21, 2014 at 3:35am

Chemistry Need help ASAP
A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
Sunday, September 21, 2014 at 1:33am

Chemistry
Which process could be used to calculate the bond energy for the covalent bond X-Y by dividing its ∆H by n? A XYn(g) → X(g) + nY(g) B 2XYn (g) → 2XYn-1(g) + Y2(g) C Y(g) + XYn-1(g) → XYn(g) D nXY(g) → nX(g) + n/2 Y2(g)
Sunday, September 21, 2014 at 12:14am

chemistry
Calculate the number of moles of O atoms in a 2.5x10(-6)kg sample of C8H10N4O2
Saturday, September 20, 2014 at 11:17pm

chemistry
Calculate the number of C atoms in a .25mg sample of C8H10N4O2
Saturday, September 20, 2014 at 11:16pm

chemistry
A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
Saturday, September 20, 2014 at 10:57pm

Chemistry
A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
Saturday, September 20, 2014 at 10:39pm

chemistry
A proposed mechanism for a reaction is: (i) A + B2 AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining step? ...
Saturday, September 20, 2014 at 10:36pm

chemistry
The number of kilojoules needed to raise the temperature of 125 g of water from 20°C to 95°C is ________. The specific heat of water is 4.184 J/g °C.
Saturday, September 20, 2014 at 9:22pm

chemistry
balanced equation =2 H(2)+ 1 O(2) -> 2H(2)O A. What mass of H2O would be produced from7.4 mg of O2 B. What is the volume of H2O would be produced from 7.4kg of O2. Density of water = 1.000g/ml
Saturday, September 20, 2014 at 7:02pm

chemistry
an x-ray photon of wavelength 0.989nm stricks a surface. the emitted electron has a kinetic energy of 969 eV.what is the binding energy of the electron in kj/mol?
Saturday, September 20, 2014 at 5:15pm

Chemistry
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 15.00% naphthalene by mass. Calculate the vapor pressure at 25 ∘C of hexane above the solution. The vapor pressure of pure hexane at 25 ∘C is 151 torr. I keep getting 168 torr...
Saturday, September 20, 2014 at 3:49pm

chemistry
does alka seltzer dissolve faster in hot water or cold water experimental errors that could take place? could it be the same water temperature different time that alka seltzer is placed
Saturday, September 20, 2014 at 11:33am

Chemistry
An organic acid has a percentage composition by mass of C 41.4%, H 3.4%, and O 55.2%. A solution containing 0.250g of the acid, which is dibasic required 26.60 cm cubed of NaOH solution (0.20 mol.dm -3) for neutralisation. Calculate the empirical formula, molecular formular, ...
Saturday, September 20, 2014 at 11:16am

Chemistry
I am so confused with my chemistry lab right now. We were given the following equations to work with: [Equation 1] 2 I^- + H2O2 + 2 H^+ ----> I2 + 2 H2O [Equation 9] 2S2O3^2- + I2 ----> 2I^- +S4O6^2- And During the Experiment we used the following for each reaction: T1...
Saturday, September 20, 2014 at 12:19am

chemistry
25.0 mL of ethanol (density = 0.789 g/mL) initially at 5.5°C is mixed with 32.3 mL of water (density = 1.0 g/mL) initially at 25.3°C in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the mixture?
Friday, September 19, 2014 at 9:47pm

chemistry
a C4H8(g)+â O2(g)⟶ ã CO2(g)+ä H2O(g) balance this equation put a coefficient in a,b,y,d to balance equation please help
Friday, September 19, 2014 at 7:18pm

chemistry
why does alka-seltzer dissolve faster in hot than cold water
Friday, September 19, 2014 at 5:19pm

Chemistry
The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium sulfate is added, a ...
Friday, September 19, 2014 at 5:12pm

Chemistry
The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium sulfate is added, a ...
Friday, September 19, 2014 at 5:09pm

Chemistry
Imagine that you are a charge nurse in a nursing home. You are typically the only medical personnel in the house at any one time. A patient who is known to have excess stomach acid asks you to give him an antacid tablet. The typical antacid is either calcium carbonate or ...
Friday, September 19, 2014 at 3:04pm

Chemistry Help!
Cyanohydrins can be made from carbonyl compounds by generating CN- ions from HCN in the presence of a weak base. In a similar reaction, -CH2CO2CH3 ions are generated from CH3CO2CH3 by strong bases. Which compound can be made from an Aldehyde and CH3CO2CH3? Option 1 : ...
Friday, September 19, 2014 at 3:00pm

chemistry
Does Alka-Seltzer dissolve faster in hot or cold water? background: give information about why this lab is important, what key principles are involved and explain them. i need 2 paragrpahs so i was thinking on writing a bit on what alka seltzer is but idk what else to put
Friday, September 19, 2014 at 9:22am

chemistry
Can someone please explain to me how to find the energy released? Given the overall reaction that takes place when hydrogen is burned in a young star, how much energy in MeV is released per He nucleus formed? masses: 1-H atom= 1.007amu 4-He atom= 4.002 amu positron = 5.485e-4 ...
Friday, September 19, 2014 at 7:55am

chemistry
A solution was prepared using 1,00 liter of water, 59 g glucose, and 2,3 g NaCl. One liter of water weighs 1000 grams. The solution needs to be labeled in terms of % glucose and % sucrose.
Friday, September 19, 2014 at 6:58am

chemistry
Pure aluminum has density 2.70g/cm^3. If we add a solid aluminum cylinder to a graduated cylinder containing 19.2 of water, and the water level in the cylinder rises to 24.7 ml, what is the mass of the aluminum cylinder?
Friday, September 19, 2014 at 2:49am

chemistry
Acetone, a common solvent has a density 0.79g/cm^3 at 20C. What is the volume of 85.1g of acetone at 20C? What is the mass of 125ml of acetone at 20C? Show your calculations.
Friday, September 19, 2014 at 2:45am

chemistry
A website promoting the use of alternative energy vehicles and hybrid technologies claims that, \"A typical automobile in the USA uses about 40 gallons of gasoline every month, producing about 750 lbs of carbon dioxide.\" To determine the truth of this statement, ...
Thursday, September 18, 2014 at 11:47pm

chemistry
using your initial mass of copper, calculate the minimum volume of concentrated 12M nitric acid needed to completely react with your copper to form copper(II) nitrate? Original mass of copper was 0.40g.
Thursday, September 18, 2014 at 10:55pm

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

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