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Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

AP Chemistry
Consider 54.0 mL of a solution of weak acid HA (Ka = 10^-6), which has a pH of 4.140. What volume of water must be added to make the pH = 5.000? [HA]=((10^-4.14)^2)/(10^-6) = 0.0052480746 0.0052480746 x 54 = c x v c= ((10^-5)^2)/(10^-6) = 10^-4 v= (0.0052480746 x 54)/(10^-4) ...

Chemistry
A laboratory technician wants to determine the aspirin content of a headache pill by acid–base titration. Aspirin has a Ka of 3.0 × 10-4. The pill is dissolved in water to give a solution that is about 10-2 M and is then titrated with KOH solution. Find the pH at each of ...

Qualitative analysis ( Chemistry)
A solution x forms a white precipitate with dilute sulfur in acid and also with aqueous silver nitrate. What could solution x contain? A) Barium Chloride B) Barium nitrate C) Magnesium chloride D) Magnesium chlorine Could someone tell me how to get the answer and explain it to...

Chemistry
How many moles of hydrogen from when 10 moles of methane react completely?

Chemistry
How many moles of water vapor react to yield 546.234 moles of hydrogen?

Chemistry
Write a conversion factor that could be used to convert between moles of methane and moles of hydrogen

Chemistry
Calculate the amount of heat required to convert 155 g of ice at -10oC to steam at 110oC? (155g)x[0-(-10)]C x (.50cal/g x C) = 775cal (155g) x (80cal/g) = 12400cal (155g)x(100-0)C x (1.00cal/g x C) = 15500cal (155g) x (540cal/g) = 83700cal 775cal + 12400cal + 15500cal +...

chemistry
What amount of ice must be added to 540.0 g of water at 25.0 °C to cool the water to 0.0 °C and have no ice

Chemistry
Explain the difference in acidity of MgO dissolved in water and of P4O10 in water in terms of position of the element in the periodic table and bonding. I found MgO is basic and P4O10 is acidic

chemistry
A common way of producing hydrogen gas in the lab is by reacting zinc with hydrochloric acid. Zn (s) + 2 HCl (aq) -> ZnCl2 (aq) + H2 (g) A sample of impure zinc, of mass 5.10g, reacted with an excess of hydrochloric acid solution 3.0 mol dm-3 concentration. In the end 1.7dm...

chemistry
The combustion of 1.00g of vitamin C, compound that contains only carbon, hydrogen and oxygen produced 1.500g of co2 and 0.401g of H2O. Find the molecular formula of vitamin C knowing that its molecular mass is 176

Chemistry
In the qualitative analysis scheme, magnesium and nickel precipitate from solution upon the addition of sodium hydroxide. Once separated from the remaining cations by filtration or decanting, the solid mixture is acidified and warmed to dissolve magnesium and nickel cations ...

Chemistry
The chief compound in marble is CaCO3. However, marble is readily attacked by acids. a) Determine the molar solubility of marble (that is, [Ca2+] in a saturated solution). b) Determine the equilibrium constant for the overall reaction that occurs when marble reacts with acid. ...

Chemistry
What are some classes of organic compounds that have unpleasant odors?

Chemistry
How to find grams used of methanol? The molecular weight in g/mol is 32.04 and the density is 0.791. Also 25 mL of methanol was used. How to convert this to grams?

chemistry
The fermentation of glucose to form ethanol occurs according to the following chemical reaction: C6H12O6(aq) → 2 C2H5OH(l) + 2 CO2(g) A) If 700 grams of glucose (C6H12O6) are fermented, what is the maximum volume in milliliters of ethanol (C2H5OH) that can form? (Density of ...

chemistry
If 700 grams of glucose (C6H12O6) are fermented, what is the maximum volume in milliliters of ethanol (C2H5OH) that can form? (Density of ethanol is 0.79 g/mL)

Organic chemistry (QA)
In which solutions will a white precipitate be observed when aqueous copper (ii) chloride is added to it? A) Sodium hydroxide B) Potassium carbonate C) Lead (ii) nitrate D) Magnesium Sulfate Could someone tell me the ans and explain it to me, thk u!

Chemistry
Hydrogen gas is produced industrially by reacting methane gas, CH4 (g), with water vapor to from carbon monoxide and hydrogen gas. In a particular reaction, 25.5L of methane (measured at a pressure of 732 torr and a temperature of 25degree Celcius) mixes with 22.8 L of water ...

Chemistry
Which gas has the greatest kinetic energy? a) neon at a temperature of 200k b) neon at a temperature of 300k c) neon at a temperature of 400k d) neon at a temperature of 500k e) neon at a temperature of 600k f) none of the above (they all have the same kinetic energy)

Chemistry
A gas of unknown identity diffuses at a rate of 83.3 mL/s in a diffusion apparatus in which carbon dioxide diffuses at the rate of 102 mL/s. Calculate the molecular mass of the unknown gas. Give your answers in units of g/mol to three significant figures.

Chemistry
How many moles of ozone does the atmosphere hold? For a sense of scale,compare the amount to the total carbon dioxide emitted annually from fossil fuel burning, cement production and deforestation (7900 Tg/C). Given with the facts the amount of ozone is equivalent to a 3mm ...

Chemistry
For gaseous n-pentane and isopentane, both at 298K, ΔGf°=−194.4kJ/mol and−200.8kJ/mol, respectively. The vapor pressures of the liquids are given by: n-pentane:log10P(atm)=3.9714−1065/T−​41 isopentane:log10P(atm)=3.9089−1020/T​40 Calculate (a) KP for...

Chemistry Heat Capacity
Is ΔCP for the reaction > 0 or < 0? Would an atmosphere of 20% carbon dioxide, 5% carbon monoxide, and 75% nitrogen oxidize nickel at 1000K? It is given that ΔG° = -66.62 KJ/mol, ΔH° = -48.93 kJ/mol, and ΔS = 17.69 J/ mol K

Chemistry
Determine the mass of NH2CH2CO2Na and the volume of 0.150 M HCl solution required to make 1.35 L of a buffer solution at pH=10.75 and at a total concentration of 0.33 M. pKa(NH2CH2CO2H)=9.88. a.Mass of NH2CH2CO2Na: b. Volume of HCl solution: Hi Im sooo confused. 9.88=10.75+log...

Chemistry
Sample A: Solid appearance:crystals, solids, white Solid Conductivity:no Solubility: soluble Solution appearance:substance disappears slowly Solution Conductivity: yes Relative melting point:2nd Sample B: Solid appearance:brown, tiny solids, dirt appearance Solid Conductivity...

Chemistry
Calculate the standard enthalpy change for the reaction 2A+B⇌2C+2D Use the following data: Substance ΔH∘f (kJ/mol) A -247 B -375 C 191 D -483 Express your answer to three significant figures and include the appropriate units. My answer was 285 kJ/mol but mastering ...

Chemistry
In need of help setting up each of these problems. Under the conditions in a laboratory experiment, 0.0513 grams of aluminum (At. Wt.=27.0) was reacted with excess hydrochloric acid to produce hydrogen gas according to the following balanced equation: 2 Al+ 6 HCL -> 2 AlCl3...

chemistry
(2.00x10⁵)⁻³

Chemistry
if the total partial pressure of Ne and He having the same mass in a sealed container is 6atm then what is that of Ne?

Chemistry
pressure of Ne in sealed container

Chemistry
What is the maximum mass of cobalt (II) phosphate that will precipitate from a solution prepared by adding an excess of K3PO4 solution to 100.0 mL of 5.0 M CoCI2? Sorry for all the confusion with different names we are working in a group and its easier to keep track who's work...

Chemistry
Explain how a ligand can be both sigma donating and pi donating and give an example of a ligand that does both. Is this ligand a Lewis acid or a Lewis base?

Chemistry
A hydrogen atom in the ground state absorbs a photon with a wavelength and after it release a photon with a second wavelength. On which orbital will drop the electron?

chemistry
How much heat is absorbed if 45 grams of sweat is evaporated from someone's skin? ∆Hvap for water at body temperature is 2.41 kJ/g.

Chemistry
Hydrogen gas is used for many purposes, including the hydrogenation of vegetable oils to make margarine. The most common industrial process for producing hydrogen is "steam reforming", in which methane gas, CH4, from natural gas reacts with water vapor to form carbon monoxide ...

Chemistry
An antacid contains 200mg of aluminum hydroxide and 200 mg of magnesium hydroxide per capsule. How many moles of aluminum hydroxide does each capsule contain? What is the mass in milligrams of 0.0734 mole of magnesium hydroxide?

Chemistry
Explain the difference in acidity of MgO dissolved in water and of P4O10 in water in terms of position of the element in the periodic table and bonding. I found MgO is basic and P4O10 is acidic

Science (Stoichiometry with Gasses) (Chemistry)
If 1.00 kg of methane (CH4) is burned completely (in excess O2) and the CO2 produced is collected at 20°C and 1.00 atm, what volume (L) will this CO2 occupy??

CHEMISTRY
WHAT IS THE IUPAC NAME OF CH2(OH)CH2(OH)

Chemistry
An unknown metal has a mass of 4.67g. It is heated to 95.1 C and then placed in a calorimeter that contains 24.3g of water at 21.7 C. The metal and water both reach a final temperature of 24.6 C. What is the specific heat of this metal? What is the unknown metal? Q=mcdeltaT c=...

Chemistry
How much amount of CaCO3 in gm having % purity 50 percent produces 0.56 litre of CO2 at STP on heating. (Answer 5)

chemistry
An hydrogen atom in the ground state absorbs a photon with a wavelength one and after release a photon with a wavelength two,on which orbital will drop the electron?

chemistry
Identify the element that has a ground state electronic configuration of [Ar]4s23d104p 4

Chemistry
The equation is N2 + O2 reacts 2NO Given 12.5 mg of oxygen reacts with 21.4 mg of Nitrogen what mass of product is formed

chemistry
Pl help...what are the isomers of chlorodibromobenzene

Chemistry
Oxalic acid, found in the leaves of rhubarb and other plants, is a diprotic acid. H2C2O4 + H2O ↔ H3O+ + HC2O4- Ka1= ? HC2O4- + H2O ↔ H3O+ + C2O42- Ka2 = ? An aqueous solution that is 1.05 M H2C2O4 has pH = 0.67. The free oxalate ion concentration in this solution is [C2O42...

Chemistry
What volume (in mL) of 1.0 M HCl is required to prepare 500 mL of pH 7.76 buffer using triethanolamine that is 0.020 M in both triethanolamine and triethanolammonium ion?

Chemistry
When coal is burned, the sulfur it contains is converted into sulfur dioxide. This is SO2 is a serious pollutant, so it needs to be removed before it escapes from the stack of a coal fired plant. One way to remove the SO2 is to add limestone, which contains calcium carbonate, ...

Chemistry
A precipitation reaction takes place when a water solution of potassium phosphate, K3PO4, is added to a water solution of cobalt (II) chloride, CoCl2 Write a balanced equation for this reaction

Chemistry
Potassium permanganate, KMnO4, a common oxidizing agent, is made from various ores that contain manganese (IV) oxide, MnO2. The equation shows the net reaction for one process that forms potassium permanganate 2MnO2+2KOH+O2=2KMnO4+H2 Explain why the oxygen gas is in excess

Chemistry
Potassium permanganate, KMnO4, a common oxidizing agent, is made from various ores that contain manganese (IV) oxide, MnO2. The equation shows the net reaction for one process that forms potassium permanganate 2MnO2+2KOH+O2=2KMnO4+H2 What is the maximum mass, in kilograms, of ...

Chemistry
Hydrogen gas is used for many purposes, including the hydrogenation of vegetable oils to make margarine. The most common industrial process for producing hydrogen is "steam reforming," in which methane gas, CH4, from natural gas reacts with water vapor to form carbon monoxide ...

Chemistry
Hydrogen gas is used for many purposes, including the hydrogenation of vegetable oils to make margarine. The most common industrial process for producing hydrogen is "steam reforming," in which methane gas, CH4, from natural gas reacts with water vapor to form carbon monoxide ...

Chemistry
Hydrogen gas is used for many purposes, including the hydrogenation of vegetable oils to make margarine. The most common industrial process for producing hydrogen is "steam reforming," in which methane gas, CH4, from natural gas reacts with water vapor to form carbon monoxide ...

Chemistry
Elemental analysis of a compound, once used as a pesticide, was found to be 74.2% carbon, 8.64% hydrogen, and 17.2% nitrogen. This compound has a molecular mass of 162.23g/mol, what is the molecular formula for this compound?

Chemistry
Which reaction below represents the second ionization of Lr?

chemistry
what are the isomers of chlorodibromobenzene

Chemistry
Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density of CaF2 from these ...

Chemistry
What are the isomers of chlorobromobenzene

chemistry
Determine the mole fraction of lithium bromate in a 6.32 M aqueous solution of lithium bromate. The density of the solution is 1.16 g mL-1. I understand that 6.32 M of solution= mols of the compound. I multiplied 1000mL by the density to get grams. I don't know what to do next.

Chemistry
Use the calculation of specific heat for your metal as an example and determine the effect on specific heat if the sample temperature is changed. Does this small loss in heat significantly (>5%) affect your value for the specific heat of the metal? How would I solve this? ...

Chemistry
What is the molarity of the final solution if 2.00mL of the 5.00 M stock solution is diluted to 10.00mL to make solution A? Solution A then undergoes a second dilution by taking 3.00mL solution A and diluting it to 25mL.

chemistry
nitrogen and hydrogen react to form ammonia. N2+3H2=2NH3. 12 dm3 of hydrogen reacted with excess nitrogen to form 2 dm3 of ammonia. what is the percentage yield of ammonia at room temperature and pressure

chemistry
Enthalpy of combustion of c(graphite)is _393.3 KJ mol -1then for producing 39.3 KJ of heat the amount of carbon required is

Chemistry
Give a simple test that would allow you to distinguis between the following pairs of anions. Tell what you would do and what you should observe for each anion. A. CO3^2- and SO4^2- B. Cl- and SO4- C. CO3^2- and Cl- Now, for each cation A. B^3+ and Ca2+ B. Ca^2+ and Sr+ C. Ca^2...

Chemistry
How many milliliters of water at 25.0°C with a density of 0.997 g/mL must be mixed with 165 mL of coffee at 91.0°C so that the resulting combination will have a temperature of 62.1°C? Assume that coffee and water have the same density and the same specific heat (4.18 J/g...

Chemistry
Are the units for frequency Nu or Hz????????!

Chemistry
Does anyone know the answers to the Chemistry unit 4 lesson 11 ( Chemical Bonding ) test ?? In 11th grade

Chemistry (Mass/volume)
What are factors that will contribute to achieving the lowest mass/volume ratio possible for an airbag? The "mass" includes the mass of the reactants, bag, and any additional materials you would use to make the airbag. The "volume" is of the inflated air bag.

Chemistry
One third of vanilla ice cream provides about 145 kcal of energy. A typical adult uses about 195 kcal/hr of energy while walking. If all of the energy in one third of a cup of vanilla ice cream were to be burned off by walking, how many minutes would it take for this energy to...

Chemistry
Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density of CaF2 from these ...

Chemistry
What is the mass in grams of a 15.8 L sample of ozone (O3) at 1.67 atm and 30.0 °C?

Chemistry
What volume of dry NO at 25°C and 1.00 atm can be prepared by reacting 6.35 g of Cu with 25.0 mL of 6.0 M nitric acid, HNO3? 3 Cu(s) + 8 HNO3(aq) --> 3 Cu(NO3)2(aq) + 2 NO(g)+ 4 H2O(l)

Chemistry
When 20 grams of calcium carbonate decomposes, how many grams of calcium oxide are produced?

Chemistry
This compound has a molecular mass of 1268.06g/mol, what is the molecular formula for this compound?

Chemistry
What is Enthalpy?

chemistry
I post this question two time before but the degree sign is wrong so I post this one with everything corrected for the final time. Thank upon who answer this question on the other 2 same question before. Calculate the final temperature that results from mixing 245 grams of ...

chemistry
Calculate the final temperature that results from mixing 245 grams of cobalt, specific heat 0.446 J/g0C, at 1420C with 106 grams of water at 24.80C.

Chemistry
How much mg of iron are there in 100g of spinach. if we burned 5.20g of spinach and added 10 ml of 2.0 M HCl into the spinach ashes.Then filtered the ashes and used 5 ml of that solution to put it in a testube and added 5 ml of 1.5 M KSCN in the testube. We then use a ...

Chemistry
Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density of CaF2 from these ...

chemistry
Blue copper sulfate pentahydrate (CuSO4.5H2O) crystals were heated to give the white monohydrate. What percentage of water was lost? (molar mass of CuSO4.5H2O is 250.5 g/mol)

Chemistry
A synthesis yielded 222g of phosphoric acid. How many moles of phosphoric acid were produced? I keep dividing 222g/98g (molar mass) which gives me 2.265. Every time I put the answer in, it tells me I am wrong.

Chemistry
What is the value of [h3o] in a solution where [oh]=4.20x10^-6

Chemistry
If 4.00g of iron metal are reacted in a calorimeter with a heat capacity of 500J/ degree Celsius, what would be the final temperature of the calorimeter if its initial temperature were 23.0 degree Celsius?

chemistry
The average molar mass of a natural gas is 17.4g/mol consisting of CH4 and C2H6,what is the molar fraction of each gas?

Chemistry
Potassium chlorate, KCIO3, acts as an oxidizing agent in matches, explosives, flares, and fireworks. In the equation below, it is formed from the element chlorine and potassium hydroxide. 3 Cl2+ 6KOH=KCIO3+5KCL+3H2O Write a conversion factor that could be used to convert ...

Chemistry
In 1985 benitoite became the California "state gemstone." Found only in a tiny mine near Coalinga, California, it is a silicate of barium and titanium with trace impurities that cause a range of hues from colorless to blue to pink. Its general formula is BaTi(SiO3)3. If a 15 ...

Chemistry
An analytical chemist weighs out 0.225g of an unknown diprotic acid into a 250mL volumetric flask and dilutes to the mark with distilled water. He then titrates this solution with 0.0700M NaOHsolution. When the titration reaches the equivalence point, the chemist finds he has ...

Chemistry
What is final temperature of a 88 gram sample symbol of water at 295 k that absorbs 1250 Joules of heat ?

Chemistry
A 1 g sample of water at 373 K is cooled by the removal of 100 J . what will be the final temperature of the water

Chemistry
What mass of water in Gram can be heat from 300 K to 315 K by addition of 600 Joules of heat ?

chemistry
A process is carried out at constant pressure. Given that ΔE is positive and ΔH is negative, Select one: A. the system absorbs heat and contracts during the process. B. the system absorbs heat and expands during the process. C. the system loses heat and contracts during the ...

chemistry
Zinc reacts with sulphur to form zinc sulphuric 16.2g.Sample of zinc is reacted with log of sulphur(Zn=65,S=32,o=16) A)Write a chemical reaction for the reaction b)Calculate the number of moles of zinc atoms that reacted. c)Number of moles of sulphur atoms that reacted

Chemistry
What problems might arise if the anesthesiologist did not know the patient's higher body temperature?

chemistry
Calculate the final temperature that results from mixing 245 grams of cobalt, specific heat 0.446 J/g0C, at 1420C with 106 grams of water at 24.80C.

Chemistry
Use two concentration tables to calculate the concentrations of the species present in a 0.0400 M solution of CsBrO. a.[HBrO] b.[BrO-] = 0.0400M c. [H3O+] d.[OH-] hi. how would I attempt this problem. can you walk me through it or give me a hint.

chemistry
stoichiometry problem Fe2O3+HCl=H2O+FeCl3 If 42.2 grams of iron(III) Oxide react with HCl how many gramd of iron(III)chloride should be produced

Chemistry
A student determined the calorimeter constant of the calorimeter. The student added 50.00 mL of cold water to 50.00 mK of heated , distilled water in a styrofoam cup. The initial temp of the cold water was 21,00C and the hot water, 29.15C. The maximum temp pf the mixture was ...

Chemistry
For a 0.47 M solution of LiClO compute the pH. Hi. I am confused about this question. I calculated the pH...but my answer is wrong. what am I doing wrong??? pH=-log(0.47) pH=0.33

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