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Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Describe What Happens When Aqueous Nh4 Is Slowly Poured Into A Solution Of Znno3 Until There Is Excess Nh3 Solution

CHEMISTRY
STATE gay-lussac's law And Avogadro's law.

Chemistry
Describe What Happens When Aqueous Ammonium Is Slowly Poured Into A Beaker Containing A Solution Of ZnNO3 Until There Is Excess Ammonia Solution

Chemistry
0.222g Of A Divalent Metal Is Deposited When A Current Of 0.45 Amperes Is Passed Through A Solution Of It's Salt For 25 Minutes Using Appropriate Electrodes. Calculate The Relative Atomic Mass Of The Metal. (1 Faraday =96500c/mol)

Chemistry
For How Long Must A Current Of 1.5 Ampere Be Passed Through An Aqueous Solution Of A Copper Salt During Electrolysis In Order To Deposit 2.50g Of Copper (cu=63.5)

Chemistry
For an activation energy of 55.0kJ/mol,how much does the temperature have to change from 22 degrees Celsius to produce a doubling of the rate constant?

Chemistry
What quantity of sulfur will exa tly react with 128g of oxygen gas to form sulfur dioxide

Chemistry
An unknown monoprotic acid has a pH of 2.87. Is this acid weak or strong if 22.32 mL of 0.112 M NaOH is required to titrate 25.00 mL of the acid? If the acid is weak, calculate its Ka. Answer is Ka = 1.8 x 10^-5, but I don't know how to get there. Any help would be appreciated...

Chemistry 12
The following data was obtained after 25.00ml of benzoic acid was titrated with potassium hydroxide. Volume of KOH used: Trial 1: 27.80ml Trial 2: 27.88ml Trial 3: 27.66ml Initial pH: 3.125 pH at 13.92ml: 5.013 Find the Ka for this sample of citric acid and the concentration ...

Chemistry
A 25.00 mL sample of a soft drink was titrated using 12.10 mL of 1.50 M NaOH. Given that the soft drink's monoprotic acid has a Ka value of 2.8 x 10^-5, predict the pH of the soft drink. I know that the answer is pH 2.85 (our practice questions have an answer key) but I'm ...

Chemistry
What is the molecular structure of methylated spirit

Chemistry
45.0g Pb at 115C is added to 125 g of water at 25.0C in a well insulated calorimeter. What is trhe final temperature in C for the water? The Specific heat of lead is 0.129J/gC and the specific heat of water is 4.184 J/gC. Could someone please explain the proper way this ...

Chemistry
What would be the correct way to arrange this? Consider the reaction below. 3K2C2O4(aq)+2Fe(NO3)3(aq)->Fe2(C2O4)3​(s)+6KNO3(aq) What mass in grams of K2C2O4 (MM=166.22g/mole)will react completely with 35.0mL of 0.800M Fe(NO3)3?

Chemistry
Which statement is NOT correct regarding the statment below? 2Al+6HCl->2AlCl3+3H2 A. 2 atoms of Al produces 3 Molecules of H2 B. 3 Moles of Hcl produces 1 mole of AlCl3 C. 6 grams of Hcl reacts with 2 grams of Al D. None of these. I'm leaning towards C, but i'd like someone...

Chemistry
What compounds(or anions or cations) will make FeCl3 colourless, when it is added to the initial compound(anion or cation)?

Chemistry
The Ksp of manganese(II) hydroxide, Mn(OH)2, is 2.00 × 10-13. Calculate the solubility of this compound in g/L.

Chemistry
How to prepare 10% sucrose solution enriched with 0.1% phenylalanine? And also how to make the stock solution of phenylalanine for the above process. I have prepared 10% sucrose solution by adding 10g sucrose in 100ml water , but how do i make 0.1% phenylanine in 10% sucrose ...

Chemistry
When you label distillation apparatus, is the condenser the same as the water jacket? Thanks

Chemistry
The photoelectric effect is a concern in space, where parts of a spacecraft exposed to the sunlight will develop a net positive charge, which can interfere with or damage sensitive cir The panels that cover the exterior of the Space Shuttle are composed of graphite fibers, ...

Chemistry
Element x has the highest first electron affinity in its period, the ground state electron configuration of its common is: [Kr] 5s2 4d10 5p6 Element Y is the second largest element in its period; its valence electron are in orbital(s) that have n= 6. What is the most stable ...

hina
chemistry

Chemistry
List SOF2, SO2F-, and S2O3^-2 in order of increasing sulfur-to-oxygen bond length. How do u tell by just looking at the Lewis structures?

chemistry
1040 kHz (typical frequency for AM radio broadcasting) Express your answer in meters using four significant figures.

chemistry
a sample of phosphorous has 0.5 moles of P4 molecules 1]how many P4 molecules are there? 2]how many P atoms are there? 3]how many moles of P atoms are there in the sample? 4]what is the mass of the sample?

chemistry
ph of 0.001M H2X OF 50%dissosiation

Chemistry 11th Grade
Nitrogen form five compound with oxygen in which 1.0 g of nitrogen combines with 0.572,1.14,1.73,2.28 and 2.85g of oxygen respectively .show dis figure agree with law of multiple proportion.

Chemistry
Can anyone balance this equation out of me? Sorry I don't quite understand how to balance equations. When the following molecular equation is balanced using the smallest possible integer coefficients, the values of these coefficients are: __ bromine trifluoride (g) -----> ...

chemistry
The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole. How many carbon atoms are in 2.50 g of butane?

Chemistry
What is the percent yield of a reaction that converts 5,0 kg of toluene to 6,02 kg of benzoic acid? 2C6H5CH3 + 3O2 --> 2C6H5CO2H + 2H2O

chemistry
the density of a gas at N.T.P is 1.40grams per litre. The molecular weight of gas is

chemistry
Sodium carbonate (Na2CO3) has a molar weight of 105.9885 g/mol. A solution contains 50. mM sodium ions and 25 mM carbonate ions. What is the concentration of sodium carbonate in the solutions as expressed as mass/volume percentage?

chemistry!!
Sodium carbonate (Na2CO3) has a molar weight of 105.9885 g/mol. A solution contains 50. mM sodium ions and 25 mM carbonate ions. What is the concentration of sodium carbonate in the solutions as expressed as mass/volume percentage?

chemistry
The approximate concentration of hydrochloric acid. HCL in stomach is 0.17M. Calculate the mass of the following anatcids bicarbonate of soda NaHCO3

chemistry
Given a PH of buffer solution is 4.23 made from 0.35 formic acid. Calculate the concentration of formate.The constant dissociation for formic acid is 3.75

Chemistry
In the troposphere the atmospheric pressure decreases about 10 kPa and the temperature decreases about 279 K for every kilometer above the earth's surface you go. As a weather balloon released from the ground rises up will its volume increase, decrease or stay the same? Offer ...

Inorganic Chemistry
What will happen if we add Mg powder to a (NH4)2SO4(aq) solution? What would be the products?

Chemistry-Ideal gases
Can we convert an ideal gas into a liquid?

Chemistry
What is more acidic from [CuCl4]^(-2) and ethanoic acid? And what is the reason?

Chemistry
"Hi there! So I have a chemistry project due in a few hours. I need to find the molar mass of a specific antacid tablet, but all I know is that the tablet is made up of 550mg CaCO3 and 110mg Mg(OH)2 I also know that the tablet has a mass 1.35g. How do I find the molar mass of...

Chemistry
When a concentrated NaCl aqueous solution is electrolyzed, what is the reason for the stabality of the products to be lesser stable as of thermodynamically, with respect to the reactants? Is it because the products are gasses? H20(l) +4e--->H2(g) + 2OH-(aq) 2 Cl-(aq)--->...

Organic Chemistry
We are asked to order the following compounds considering their hydrolysis. 1)CH3COCl 2)CH3CO-C2H5 3)CH3-CO-N:H2 4) CH3-CO-O-CH3 What are the main factors which determine how easily they tend to hydrolysis?

Chemistry
Which three-centred π molecular orbitals are occupied in NO2-? Select all that apply.

Chemistry
A sample of a curium isotope was roasted. It was determined that the product( curium oxide) contained 11,59% of oxygen.¿ What is the equivalent weight of the isotope in the oxide? ¿ What is the mass of the curium isotope? I have already gotten the answer for the first ...

Chemistry
Which of the follwing is not a strong acid? HI, HCl, HF, HBr, All are strong acids.

Chemistry
Which atom is most likely to form a 2+ ion? Zn, Al, S, Na, N, cannot be determined

Chemistry
Which of the following is a molecular compound? H2S, MgBr2, Fe2O3, none of these

Chemistry
Hcl is given 38percentage by mass with density 1.1 0 gml what is the molarity and molarity give answer

Chemistry
A mineral that contains iron and sulfur has the cubic unit cell pictured below. What is the empirical formula for this mineral? •Fe atoms are the smaller spheres; one on each corner and one on each face of the unit cell •S atoms are the eight larger spheres; every S atom ...

Chemistry
A hydrate of copper (II) sulfate with formula CuSO4.xH2O has a molar mass of 250.0 g/mol. 2.545 g of hydrate is heated and 63.85% of the residue is found after heating. a) Determine the value of x in the formula of the compound b) What is the molecular formula of the hydrate?

Chemistry
A compound contains 'N' and 'O' atom. The ratio of mass percentage of 'N' and 'O' is 7:16. If the vapour density of compound is 46, then find the no of 'O' atoms present per molecule of the compound.

Chemistry
Is the NO3- single bond length shorter than NO2H single bond length? Based on Lewis structure of it.

Chemistry
Hello I have a question relaté to nucleophiles. Is The alcohol CH3OH a nucleophile or only its ion CH3O- ?

Chemistry
Howard Wolowitz is developing a radiation detector for the Intemational space Station. He uses a thin film composed of a metal alloy that has a threshold frequency of 5.5x10^15 Hz. When radiation is shone on the thin film, the fastest electron emitted has a velocity of 668000 ...

chemistry
need help with a question calculate the concentration of grams of sodium stearate per milliliter of diluted solution. To do this, multiply the concentration of sodium stearate in the dishwashing liquid by the dilution of the solution(1.50 ml dishwashing liquid per 100ml ...

College Chemistry
A 86.3mL sample of water is initially at 17.4 degC. How many kilojoules (kJ) of heat must be added to raise the temperature of the water to 31.8? The specific heat capacity of water is 4.184 J/g.degC. How do I set this up to find the answer. Really confused,we haven't been ...

Chemistry
Choose and best oxidizing agent and the best reducing agent: Ni2+, Al, H+, and I- ??? I'm so confused, please help! I know the oxidizing agent is being reduced and the reducing agent is getting oxidized. But how do I use the standard reduction potential table? I can't find the...

chemistry
Use the heat of fusion of water, 79.7 cal/g. to answer the following question. How much energy in calories is released when 30.0g of water freezes?

Inorganic Chemistry
Can Cu2+ oxidize 1) SO2 2) C2O4(2-) Does this happens also when the solution is basic? Cu2+ + H2S ---> CuS + H2

Chemistry to DrBob222
Regarding my question on display.cgi?id=1496901710(I can't post URLs) Can we apply the formula PM=dRT seperately to the systems before and after being heated,and solve this one?

Chemistry
Find the ratio of rate diffusion of SO2,O2, CH4?

chemistry
The reaction of hydrochloric acid and sodium hydroxide is exothermic HCl +NaOH --> NaCl + H2O In one experiment, a student placed 50.0 mL of 1.00 M HCl at 25.5 oC in a coffee cup calorimeter. To this was added 50.0 mL of 1.00 M NaOH solution, also at 25.5 oC. The mixture ...

chemistry
The reaction of hydrochloric acid and sodium hydroxide is exothermic HCl +NaOH --> NaCl + H2O In one experiment, a student placed 50.0 mL of 1.00 M HCl at 25.5 oC in a coffee cup calorimeter. To this was added 50.0 mL of 1.00 M NaOH solution, also at 25.5 oC. The mixture ...

chemistry
when 1.00kg of copper reacts, 3.12kg of silver is recovered. what is the percentage yield?

Chemistry
I have this question from an old exam for review. I tried the question but can't get the right answers. An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a photon. The photon strikes a metal ...

Chemistry
I have this question from an old exam for review. I tried the question but can't get the right answers. An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a photon. The photon strikes a metal ...

Chemistry
Each of the following mixtures is placed in a dialyzing bag and immersed in distilled water. Circle the substances that will be found outside the bag in the distilled water. a. KCl solution and glucose solution b. albumin solution (colloid) c. albumin solution (colloid), KCl, ...

Chemistry
The pressure changes from 760mmHg to 742 mmHG. When that occurs, the volume changes from 2.8L to 3.1L. The initial tempature is 20 celcious. What is the new tempature if miles remain the same? When I did this I subtracted 760 to 742 to get 18 and subtracted 2.8 to 3.1 to get ....

chemistry
Write the anode reaction for the electrolysis of the concentrated zinc chloride solution using zinc electrodes

chemistry
why the melting point of iron is greater the that of sodium?

Organic Chemistry
What will happen from the following if H3C-C6H6-N2Cl is treated with Na2CO3? a)CO2 will emit 2)NH3(g) will emit c)N2Cl-C6H6-CH3 will be produced d) NH2-C6H6-CH3 will be produced We get C6H6-NH2 when Sn/conc.HCl are reacted with Nitro Benzene.This become Aniline when excess ...

Chemistry- Henry's Law
Why Ammonia is a deviation from the Henry's Law,when it is dissolved in water? Does that has anything to do with Ammonia having Hydrogen bonds? Or what could be the reason?

Chemistry
When you pour molten salt(NaCl) into the water, it explodes. But if you pour molten sodium bicarbonate into the water, there's no explosion. Why is this happening??? I'm so confused and I have seen a video of this actually happening. Please help!

chemistry
Consider the following equation: CO + 2 H2 → CH3OH △H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2. how would i set this up?

Chemistry-titrations
When an acid is titrated with a Carbonate, do we have to heat the system when Hph is the indicator? If so what is the reason?

Chemistry
Under special conditions D2 is reacted with Ca to make CaD2.What would result if D2 is reacted with H2O?

Chemistry
What is more basic KO2 or KOH? I know that KO2 is also craeted this way; KO2 + 2H2O ----> 2 KOH + H2O2 + O2 I think,as KOH is created by this reaction and KO2 being a raectant, the compounds created should have less strong,more stable characteristics when compared with the ...

Chemistry - percipitates
10g of AgI is dissolved in 100cm3 of water and Na2SO4(s) is added to the solution with the ppt.After about 10mins.25cm3 of the solution is taken and added Cl2 and heated.The remains Cl2 is removed and a small amount of KI(s) is added and then the solution is titrated with 0.02...

chemistry
A solution of CaCl2 is prepared by dissolving 1.004 g of the solid in approximately 30 mL of water. How many moles of CaCl2 does this solution contain?

Chemistry - Naming
What would be the name of this compound? Si4Br8

Chemistry - Ionic Compounds
List all possible unit formulas (chemical formulas) that can be constructed by the formation of binary ionic compounds from the following elements. (Separate substances in a list with a comma.) Br (Z = 35), Sr (Z = 38), Ca (Z = 20), Ga (Z = 31), O (Z = 8) Please help! I have ...

Chemistry
How many kilograms of NH3 are needed to produce 1.00×10*kg of (NH4)2SO4?

Chemistry
When 0.20 mol of hydrogen gas and 0.15 mol of iodine gas are heated at 723 K until equilibrium is established, the equilibrium mixture is found to contain 0.26 mol of hydrogen iodide. The equation for the reaction is as follows. H2(g) + I2(g) ↔ 2HI(g) What is the equilibrium...

Chemistry
1.5 mole of PCl5 are heated at constant temperature in a closed vessel of 4 litres capacity.At the equilibrium,PCl5 is 35percent dissociated into PCl3 and Cl2.calculate the equilibrium constant.

Chemistry
Given the following: 4Al+ 3O2 ==> 2Al2O3 If 3.17g of Al and 2.55g of O2 are available, which reactant is limiting? My answer is: 1.59 mol Al2O3 and 1.70 mol Al2O3. Al is limiting. Is my answer and work correct?

Chemistry
Some hydrogen gas is collected over water at 20.0 Cel. and the levels inside the container is the same. The partial pressure of hydrogen is 742.5 torr. What is the barometric pressure as the time the gas was collected. My answer is 742.5 torr = 17.5 torr = 760 torr. Am I ...

chemistry
How do I round 7,366.3275 to an exponent. My answer is 7.37 x 10 to 7th power am I right. Thanks

Chemistry
I need help with completing an equation. It is a skeletal formula that includes HOOC, HO, Cl and then MgO is added to it. I am not sure how to even begin this equation but it is unlike the previous balancing that we have done.

Chemistry PLEASE HELP ME
Strictly speaking, NO system can be completely closed - for example, hot liquid in the best thermos eventually cools down - but for most purposes a system can effectively be “closed”. How would you create a system which is more or less closed with respect to: a) Heat loss...

Chemistry
Strictly speaking, NO system can be completely closed - for example, hot liquid in the best thermos eventually cools down - but for most purposes a system can effectively be “closed”. How would you create a system which is more or less closed with respect to: a) Heat loss...

chemistry
a weather balloon is filled with helium to a volume of 250 l at sea level, where pressure is 760 mm hg. assuming constant temperature, what will be the volume when the balloon raises to a height of 25 km, where the pressure is only 10 mm hg

Chemistry
Question: At 300 K,Carbon powder and O2 are included in container of 10dm3.When the system is heated well,all the O2 converts into CO2.Then the system is cooled to the initial temperature. The volume of the Carbon powder is negligible. Find the percentage of the increasement ...

Chemistry
A saturated solution of NH4Cl was made using 500g of water at 90 degrees. the solution was cooled to 50 degrees. what mass of NH4Cl was crystallized

Chemistry
For which of following can the metal ions be separated from one another by adding solution of sodium hydroxide? (a) cobalt nitrate and aluminum nitrate (b) barium nitrate and potassium chloride (c) magnesium nitrate and nickel nitrate (d) potassium nitrate and iron (II) ...

Chemistry
Carbon disulphide reacts with oxygen gas to produce carbo dioxide gas and sulphur dioxide gas (balance)

Chemistry
Lead(3) nitrate decomposes to form three products owygen lead(2) oxide and nitrogen dioxide (balance)

Chemistry
Ammonium supphate and sodium hydroide undergo a reaction to produe three products ammonia water and sodium sulphate (balance)

Chemistry
Calcium bicarbonate reacts with hydrochloric acid to produce three products calcium chloride carbon dioxide and water (balance)

Chemistry
My question: 4a1+302--2A1203 Which reactant is limiting if 0.32 mol A1and 0.26mol oxygen is available. My answer is 0.228 is missing

Chemistry
[Cu(H2O)6]2+ (aq) + 2OH- --> Cu(OH)2 (s) + 6 H2O (l) What would the full equation be for this, rather than the ionic one? I understand that OH- becomes NaOH but where does the Na go on the right hand side? Thanks

chemistry
how to calculate the oxidation state for 'cr' in K2CRO4 ?

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