Wednesday
December 7, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Similar question to http://www.jiskha.com/display.cgi?id=147​4753951 "If that 22.33g sample of calcium chloride was dissolved in 1000.0g of water, with both substances originally at 25.0C, what would be the final temperature of the solution be? Assume no loss of ...
Saturday, September 24, 2016 by Steve

Chemistry
Please help...entrance exam soon Write the oxidation and reduction half reactions(showing e- lost or gained) for the foll O3 + I- -> IO3- + O2 (acidic)
Saturday, September 24, 2016 by Maria

Organic Chemistry
What would happen to the melting point of a solid if it is mixed with granular particles of glass? Explain.
Saturday, September 24, 2016 by Anonymous

Chemistry
Andrew weighs 45 lbs and requires insulin. His doctor has prescribed 0.150 units of insulin/kg body weight/hr while he is in the hospital. The insulin bottle you have possesses a concentration of 20.0 units/15.0 ml and all must be given. Give all answers to three sig figs. a. ...
Saturday, September 24, 2016 by Amy

Chemistry
CaCl2(s) -> Ca(aq) + 2Cl(aq) ΔH_rxn = +198.0 KJ "If that g sample of calcium chloride was dissolved in 1000.0g of water, with both substances originally at 25.0C, what would be the final temperature of the solution be? Assume no loss of heat to the surroundings ...
Saturday, September 24, 2016 by Maddison

Chemistry
Five year old Andrew weighs 45 lbs and requires insulin. His doctor has prescribed 0.150 units of insulin/kg body weight/hr while he is in the hospital. The insulin bottle you have possesses a concentration of 20.0 units/15.0 ml and all must be given. Give all answers to three...
Saturday, September 24, 2016 by Laura

Chemistry
The pressure in pressure cooker is 1.90 what will be the temperature
Saturday, September 24, 2016 by Humza Alvi

Chemistry
Aqueous solutions of copper (II) sulfate, CuSO4, and potassium carbonate, K2CO3, a blue parcipitate of copper (II) carbonate forms in addition to one other compound. We have to write the balanced chemical equation for that but our teacher didn't teach us anything about that
Saturday, September 24, 2016 by Sarah

CHEMISTRY HELP
Reaction: 1/2N2 + 3/2H2 --> NH3 Delta H = -46Kj/mol 1) Find delta H n(NH3)formed=5 mol. M(NH3=8.5g) 2) Find delta H a)3 mol H2 + 3 mol N2 b) 3 mol H2 + 0.5 mol N2 M NH3 = 17 g/mol ???
Saturday, September 24, 2016 by Christine

Chemistry (Help!)
Reaction: 1/2N2 + 3/2H2 --> NH3 Delta H = -46Kj/mol 1) Find delta H n(NH3)formed=5 mol. M(NH3=8.5g) 2) Find delta H a)3 mol H2 + 3 mol N2 b) 3 mol H2 + 0.5 mol N2 M NH3 = 17 g/mol ???
Saturday, September 24, 2016 by Christine

chemistry
A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 252 torr . Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction of hexane? (Assume ideal...
Saturday, September 24, 2016 by liz

chemistry
If 10.0 L of butane and oxygen are combined at the same temperature and pressure, which gas will be left over after reaction? Include your calculation/reasoning.
Saturday, September 24, 2016 by Darren

Chemistry
to determine the concentration of ascorbic acid in fruit juice using DCPIP
Saturday, September 24, 2016 by Zanele

chemistry
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 11.07 % 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.
Saturday, September 24, 2016 by elizabeth

chemistry
Paper pulp is sold on the basis that it contains 12% moisture; if the moisture exceeds this value, the purchaser can deduct any charges for the excess moisture and also deduct for the freight costs of the excess moisture. A shipment of pulp became wet and was received with a ...
Saturday, September 24, 2016 by jana

Chemistry
An element has three stable isotopes. One has a mass number of 63 and an abundance of 50%. The second has a mass number of 65 and an abundance of 30%. The third has a mass number of 67 and an abundance of 20%. Calculate the relative atomic mass of this element. I am so ...
Saturday, September 24, 2016 by Robert

chemistry
A sample of CaCl2⋅2H2O/K2C2O4⋅H2O solid salt mixture is dissolved in ~150 mL de-ionized H2O. The oven dried precipitate has a mass of 0.253 g. The limiting reactant in the salt mixture is K2C2O4⋅H2O. Determine Mass of K2C2O4⋅H2O(aq) in Salt Mixture in ...
Friday, September 23, 2016 by maricela

chemistry
In a large building, oil is used in a steam boiler heating system. The combustion of 1.0 lb of oil provides 2.2×107J. Part A How many kilograms of oil are needed to heat 110 kg of water from 24 ∘C to 100∘C? (Assume that 1lb=454g, the specific heat of liquid ...
Friday, September 23, 2016 by john

Chemistry
Given a 800 mg sample of Thorium-231 decomposes via beta emission with a half life of 25.5 hours, how long would it take, in days, for the sample to decay down to 25 mg? 231 0 231 Th -> Beta + Pa 90 -1 91 800 mg/ 25 mg
Friday, September 23, 2016 by Lauren

Chemistry
The efficacy of certain drugs is affected by pH. Many drugs are absorbed into the blood through cells lining the stomach or the small intestine by direct diffusion across the plasma membrane. Since the interior of the plasma membrane is hydrophobic, uncharged molecules cross ...
Friday, September 23, 2016 by Aria

chemistry
Bicine is an amino acid, but not a building block of proteins. Rather, it is a reagent commonly used in the biochemistry laboratory. Bicine contains two ionizable groups: tertiary amine (pKa 8.3) and carboxyl (pKa 2.3) a. For each of the ionizable groups in bicine, draw its HA...
Friday, September 23, 2016 by Aria

chemistry
You discovered a new diprotic acid, which you have named edmontonic acid. You want to characterize the pKa’s of edmontonic acid, so you perform a titration experiment. Your data are summarized in the table below. Your titration sample contains 150 mmol of edmontonic acid...
Friday, September 23, 2016 by Aria

chemistry
In a titration of malic acid, what is the pH after: a. 0.75 molar equivalents of NaOH have been added? 1 b. 1.30 molar equivalents of NaOH have been added?
Friday, September 23, 2016 by Aria

Organic Chemistry
One sample that is 1mm in height has a melting point range of 200-201. What would be the melting point range of a 10mm sample in height if both samples heating rate is 2 degrees Celsius per minute? I'm thinking it would be about 2000-2010 but I'm not fully sure. I used...
Friday, September 23, 2016 by Karnvir

Chemistry
How many grams of ammonia are needs to produce 0.5kg of NH42So4
Friday, September 23, 2016 by Zeeshan

chemistry
is this statement true? More heat is needed for vaporization of a liquid compared with melting a solid of the same substance.
Friday, September 23, 2016 by laura

chemistry
If you transfer 5 J of energy to 1 g water and to 1 g ethanol, each starting at the same temperature which would have a higher temperature at the end? Water or ethanol? or will they have the same temperature at the end?
Friday, September 23, 2016 by laura

Chemistry
18cubic centimeters of 0.8Mlithium hydroxide is neutralized by 24cubic centimeters of 0.3Msulphuric acid.What is the formular of the salt formed?
Friday, September 23, 2016 by Doris

Chemistry
20cubic centimeters of 0.27M sodium hydroxide solution is added to 18.2cubic centimeters of 0.75M hydrochloric acid.To the solution is then added excess magnesium.What volume of hydrogen gas measured at s.t.p evolved?
Friday, September 23, 2016 by Doris

Chemistry
84cubic centimeters of hydrogen chloride gas measured at s.t.p is dissolved in water and titrated with 0.15M sodium hydroxide.What volume of sodium hydroxide solution is required for complete neutralization?
Friday, September 23, 2016 by Doris

Chemistry
how many cubic cm hydrogen chloride gas at s.t.p would be required to precipitate all the silver ions from 32 cm of 0.08 M silver nitric solution?
Friday, September 23, 2016 by Doris

Chemistry
What volume of ammonia gas at s.t.p is required to neutralise 40 cm of 2 M sulpheric acid?
Friday, September 23, 2016 by Doris

Chemistry
8.4 g of a mixture of potassium hydroxide and potassium chloride were made up of 1 litre of aqueous solution. 20 cm of this solution required 24.2 cm of 0.1 m nitric acid for neutralisation. calculate the percentage by mass of potassium chloride in the mixture
Friday, September 23, 2016 by Doris

Chemistry
If 100.0 mL of 0.171 M Na2SO4 are added to 100.0 mL of 0.889 M Pb(NO3)2, how many grams of PbSO4 can be produced? Equation: Na2SO4 + Pb(NO3)2 = 2NaNO3 + PbSO4
Thursday, September 22, 2016 by Zach

Chemistry
(DrBob222 please help me) What would be the final temperature of the system if 16.6 g of lead at 138 ◦C is dropped into 23.4 g of water at 8.68 ◦C in an insulated container? The specific heat of lead is 0.128 J/g◦C. Please explain with the numbers plugged in ...
Thursday, September 22, 2016 by Rachel M

Chemistry
PLEASE HELP OR I WILL FAIL What would be the final temperature of the system if 16.6 g of lead at 138 ◦C is dropped into 23.4 g of water at 8.68 ◦C in an insulated container? The specific heat of lead is 0.128J/g◦C.
Thursday, September 22, 2016 by Rachel

Chemistry G.12
Check if im right please: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) At a specific time in the reaction, ammonia is disappearing at rate of 0.068 mol/(L • s). What is the corresponding rate of production of water? I did Rate of Production H20 = 1/6(0.068) = 0.0113 mol/(L*s...
Thursday, September 22, 2016 by Sherry

Physical Science/ Chemistry
Which of the following shows the correct order of Family #1 elements from least to most reactive? A) Li, Na, Rb, K B) Li, Na, K, Rb C) Rb, K, Na, Li D) Li, Na, K, Ba
Thursday, September 22, 2016 by Kayla

AP Chemistry
(DrBob222 please help me) A sample of 1.97 grams of Z is dissolved into 500 grams of water which is in a styrofoam coffee cup. The temperature is monitored and is found to rise from 25.015◦C to 25.484◦C. What is ∆Hsolution for substance Z? Assume no heat is ...
Thursday, September 22, 2016 by Rachel

Chemistry
Hey, can someone help me with this? A compound containing only C, H and O was subjected to combustion analysis. A sample of 6.120×10^-2 g produced 1.601×10^-1 g of CO2 and 5.243×10^-2 g of H2O. Determine the empirical formula of the ...
Thursday, September 22, 2016 by James

Chemistry
Trying to wrap my head around this, thanks for the help: You have 8.63 moles of C2H6O2 in the following unbalanced equation: (I already balanced it, here is the balanced): C2H6O2 + 5 O2 → 4 CO2 + 6 H2O How many moles of water are produced in this reaction?
Thursday, September 22, 2016 by BHT

chemistry
Is the following sentence true or false? The value of an error must be positive.
Thursday, September 22, 2016 by Anonymous

analytical chemistry
Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water. Here I want the concentration of nitrogen in ppm.
Thursday, September 22, 2016 by Angel

Chemistry
For a reaction N2+O2=2NO If Kc=10-30 at 25°C One Can predict with solid reason? (1) More NO is formed (2) The forward reaction goes to completion (3) The backward reaction goes to completion (4) More reactant can consumed
Thursday, September 22, 2016 by Ujala

Chemistry
For a reaction N2+O2=2NO If Kc=10-30 at 25°C One Can predict (1) More NO is formed (2) The forward reaction goes to completion (3) The backward reaction goes to completion (4) More reactant can consumed
Thursday, September 22, 2016 by Ujala

Chemistry
So I have to find the % by mass of an unknown metal that reacted with HCl to create MCl2 (with the M being unknown). Then I need to determine identity of the missing metal. I know that the final mass of the compound MCl2 is 12.47g and that the original mass of the metal M ...
Wednesday, September 21, 2016 by Krys

Chemistry
how would you prepare 250 mL solution containing the following: 0.30 M mannitol, 0.025 M phosphate buffer pH 7.5? You are given solid mannitol, kh2po4, and k2hpo4. (pKa=6.86)
Wednesday, September 21, 2016 by RP

Chemistry
How would NaHCO3 dissociate in water for a beaker diagram? Would it be Na+ and HCO3-
Wednesday, September 21, 2016 by Anonymous

Chemistry
When you mixand separate CaCO3 and SiO2 with acetic acid-vinegar, it is a chemical reaction. It bubbles and CO2 is produced. What property of CaCO3 causes this to happen? Could you explain this to me pls. I am guessing the acetic acid reacts with one of the acetic acid, but ...
Wednesday, September 21, 2016 by lulu

Organic chemistry
An unknown compound (x) melts at 60°C and is mixed with a compound (y) that melts at 45°C and is soluble in x. Will the Melting point for the mixture start below 45°? I think so, because if you look at ice and salt for an example, salt has a way higher melting ...
Wednesday, September 21, 2016 by Shay

analytical chemistry
Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water.
Wednesday, September 21, 2016 by Angel

chemistry
6 cm/sec to mph i got 9.664mph
Wednesday, September 21, 2016 by tom

Chemistry
The solubility of copper sulphate at 0 C
Wednesday, September 21, 2016 by Fahad

maths
In a class of 60 students, the number of students who passed biology is 6 more than the number who passed chemistry. Every student passed at least one of the two subjects and 8 students passed both subjects. I) how many students passed biology? ii) how many students passed ...
Wednesday, September 21, 2016 by ob

chemistry
How many grams of fe is present in 30g of FeSO4
Wednesday, September 21, 2016 by Abdul Rehman umer

College Chemistry
Determine the concentrations of MgCl2, Mg2+, and Cl- in a solution prepared by dissolving 2.39 x 10^-4g MgCl2 in 2.50L of water. Express all three concentrations in molarity. Also display the concentrations of ionic species in part per million (ppm).
Tuesday, September 20, 2016 by Bailey

chemistry
How many mL of 0.6 M H2SO4 solution are needed to react completely with 23.62 g of Fe2O3 in the following reaction?
Tuesday, September 20, 2016 by Alex

Chemistry AP
The equilibrium constant for the formation of phosphorus pentachloride is 1.9. If the partial pressure of each gas is 0.5 atm, will the reaction (as written) proceed forward or backward to reach equilibrium? PCl3(g) + Cl2(g) PCl5(g) A. Forward, because K is greater than Q B. ...
Tuesday, September 20, 2016 by Jessie

chemistry
2NO+O2->2NO2 a) During a certain interval of time the variation of oxygen O2 moles is -5mol. Calculate the variation of the number of moles of nitrogen monoxide NO and that of nitrogen dioxide NO2 during the same interval of time. b) The duration during which the variation ...
Tuesday, September 20, 2016 by angy

science chemistry
balance Redox :- CuS + SO4²- = CuO+SO2
Tuesday, September 20, 2016 by Yashvi

Chemistry
How many grams of CO2 is produced from 855 grams of C6H12O6 in the process of cell respiration? Please further discuss the solution on how to get convert the mols of glucose to mols of CO2. Thank you.
Tuesday, September 20, 2016 by Anonymous

Chemistry
You have to work with 240 mL of a liquid. You are provided with 250 mL, 400 mL and 800 mL beakers. Which would be the best size of beaker to use? Which would be the worst size? Explain your reasoning. A 250 beaker has graduations every 25 mL. With what accuracy can you ...
Tuesday, September 20, 2016 by Lisa

maths
In a class of 80 students, 53 study Art, 60 study Biology, 36 study Art and Biology, 34 study Art and Chemistry, 6 study Biology only and 18 study Biology but not Chemistry. Illustrate the information on a Venn diagram. Determine the number of students who study (I) Arts only...
Tuesday, September 20, 2016 by Kwame

Chemistry
10. Use the accepted Ksp value of Calcium hydroxide to calculate the following: a. What is the most calcium hydroxide that can be dissolved in 1.0 Liters of de-ionized water? b. What is the most calcium hydroxide that can be dissolved in 125.0 ml of de-ionized water? c. What ...
Tuesday, September 20, 2016 by John

Chemistry
A sample of 5.52 grams of NaOH is dissolved into 659 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 1.52 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution?
Monday, September 19, 2016 by Greatest

Chemistry
If 33.8 mL of lead(II) nitrate solution reacts with excess sodium iodide to yield 0.865g of precipitate, what is the molarity of the lead(II) ions in the original solution? im not exactly sure how to start this problem. But i went ahead and gave it a shot .865 PbI2 x 1 mol ...
Monday, September 19, 2016 by Anonymous

Chemistry
The mass of an empty container is 91 g. The mass of the container filled with water is 111 g. What is the volume of the container? The density of water is 1 g/cm3 .Answer in units of cm3 20cm3 016 (part 2 of 5) 1.0 points The container was emptied, dried, and a piece of metal ...
Monday, September 19, 2016 by Katie

Chemistry
How does the polarity of water cause its cohesive property? Describe with an example that we can actually see. I really need help with this!!! Especially on describing an example that we can actually see..... Can someone please explain this to me and give me an example?
Monday, September 19, 2016 by Starcatcher

science chemistry
balance Redox :- CuS + SO4²- = CuO+SO2
Monday, September 19, 2016 by Yashvi

chemistry
One isotope of a nonmetallic element has mass number 16 and 7 neutrons in the nucleus. The anion derived from the isotope has 10 electrons. Write the symbol for this anion. I thought the answer was O^2- but this isnt correct
Monday, September 19, 2016 by Dani

chemistry
The diameter of a neutral neon atom is about 1.4 ✕ 10^2 pm. Suppose that we could line up neon atoms side by side in contact with one another. Approximately how many neon atoms would it take to make the distance from end to end 1 cm? I did 1.4 x 10^2 pm x (1 m/10^9 pm) ...
Monday, September 19, 2016 by Dani

chemistry
How many kilojoules are required to melt 15g of ice at 0 degrees C, and raise the temperature of the liquid that forms to 85 degrees C?
Monday, September 19, 2016 by Todd

Chemistry help please!
Why does a clear, saturated solution of PbI2 form a yellow precipitate when a small amount of KI is added to the solution? A. KI is insoluble in PbI2. B. PbI2 is always insoluble in water. C. Adding KI is like adding I-, which drives the reaction toward the formation of I-. D...
Monday, September 19, 2016 by Laura

Chemistry please help!
What happens to the following reaction at equilibrium if the pressure is decreased? 2H2(g) + O2(g) 2H2O(g) A. The equilibrium shifts left because Q > K. B. The equilibrium shifts right because Q < K. C. The equilibrium shifts left because Q < K. D. The equilibrium ...
Monday, September 19, 2016 by Laura

CHEMISTRY
BLEACHING AGENT OF CHLORINE(Cl)
Monday, September 19, 2016 by MWOMBEKI'S SON

Chemistry
Heating 1.0 mole of ammonia and 1.0 mole of molecular nitrogen at 723k in a 10L flask,the following equilibrium is observed: N2(g)+3H2(g)=2NH3(g) when the equilibrium is reached ,0.40 moles of molecular hydrogen are present in the flask,determine Kp and Kc and equilibrium ...
Monday, September 19, 2016 by Gianna mele

Chemistry
H2S decomposes at 438k ,according to the following equilibrium: H2S(g)=H2(g)+S(s) Knowing that Kc=1.1*10-2,determine the gram amount of sulfur formed at the equilibrium coditions in a 5L flask ,where the initial concentration of H2S was 0.7M. Also,calculate Kp.
Monday, September 19, 2016 by Gianna mele

Chemistry
10g of NOBr were added to a 5L flask and the temperature was fixed to 350K. The following equilibrium is reached : NOBr(g)=NO(g)+1/2Br2(g);The pressure measured at the equilibrium was 0.63 atm.Determine Kp and Kc. I need help to solve this problem.I already done 50% but at the...
Monday, September 19, 2016 by Gianna mele

Chemistry
If you had dehydrated 1.00g of the hydrate CaCl2 ∙6H2O how many grams of anhydrous CaCl2 would you expect to be produced? Show calculations. I really am having a hard time with this question. I don't know where to start and how to perform it.
Sunday, September 18, 2016 by Chris

Chemistry
a. Write and balance the equation for the reaction of calcium carbonate with hydrochloric acid, then answer the following questions. b. What mass of calcium carbonate is required to neutralize 83.5mL of 6.00M HCl? does the balanced equation have any significance in this ...
Sunday, September 18, 2016 by Anonymous

Chemistry
How do i calculate these and express the answers in significant digits? 2.865 x 10^4m x 1.47 x 10^3 8.071 cm^2/ 4.216 1.142 x 10^-8 mm^2 / 8.5 x 10^-4 mm i tried the first one and got 4212. but i don't know if it's right
Sunday, September 18, 2016 by Holfbrincl

Chemistry
Calculate the concentration of chloride ions in the following solution. 73.28g of sodium chloride in 862. mL of solution. would it be 73.28g x 2 / 58.44g NaCl = 2.50 mol of Cl 2.50 mol Cl / .862 L = 2.91 M Cl
Sunday, September 18, 2016 by Anonymous

Chemistry
1.0 x 10^5 mL=m^3
Sunday, September 18, 2016 by Anonymous

Chemistry
Calculate the number of moles of Cl atoms in 6.28 mg CuCl2.
Sunday, September 18, 2016 by Collin

chemistry
suppose that you have a micro pipet which delivers 100 drops per cubic centimeter, and a solution of 5.0% by volume of oil in alcohol. if you had used 10 drops of this solution, how many cubic centimeters of pure oil would be left after evaporation of the alcohol?
Sunday, September 18, 2016 by diana

Chemistry
There have been two ways on making transuranium elements: neutron bombardment and a)beta bombardment b)gamma bombardment c)positron bombardment d)photon bombardment e)heavy atom bombardment
Sunday, September 18, 2016 by Mark

chemistry
a graduated cylinder containing 75.0 mL of water has a mass of 149.86 g. A piece of metal is added to the cylinder and the volume of the water changes to 86.3 mL. The mass of the graduated cylinder, water and metal rises to 218.90 g.
Sunday, September 18, 2016 by nicholas

calculus and chemistry
A container of hot liquid is placed in a freezer that is kept at a constant temperature of 10°F. The initial temperature of the liquid is 160°F. After 5 minutes, the liquid's temperature is 60°F. How much longer will it take for its temperature to decrease to ...
Sunday, September 18, 2016 by Sarah

Chemistry
The mineral dolomite has the formula caco3.mgco3. When dolomite is heated for an extended period of time at elevated temperature it decomposed to give carbon dioxide and a mixture of calcium oxide and magnesium oxide. If a 5.424 g sample of the mineral is heated for several ...
Sunday, September 18, 2016 by Andin

Chemistry
KMnO4 + H2SO4 + H2S will give K2SO4 + MnSo4 + H20 + S
Sunday, September 18, 2016 by Himanshu

Chemistry
pH indicators change color at their _____. The pH at which the color change happens for a particular indicator molecule depends on its: A. pKa; concentration. B. pKa; Ka or Kb. C. equivalence point; Ka or Kb. D. equivalence point; concentration. Is the correct answer A?
Sunday, September 18, 2016 by Laura

CHEMISTRY
As a technician in a large pharmaceutical research firm, you need to produce 450. mL of 1.00 M a phosphate buffer solution of pH = 7.20. The pKa of H2PO4− is 7.21. You have 2.00 L of 1.00 M KH2PO4 solution and 1.50 L of 1.00 M K2HPO4 solution, as well as a carboy of pure...
Sunday, September 18, 2016 by jess

Chemistry
You are required to prepare 100g of potassium nitrate crystals from its saturated solution at 75 degree Celsius. If the solubility of potassium nitrate at 75 degree Celsius is 155g and 20 degree Celsius is 31g, find the weight of potassium nitrate solution at 75 degree Celsius...
Sunday, September 18, 2016 by Sagnik

Chemistry
Given the reaction: Cu2+(aq) + S2-(aq) CuS(s) What will happen (a) if CuSO4(aq) is added? And (b) if Na2SO4(aq) is added? A. (a) Nothing; (b) Less product will form B. (a) Less product will form; (b) Nothing C. (a) Nothing; (b) More product will form D. (a) More product will ...
Sunday, September 18, 2016 by Laura

Chemistry
At a high temperature, the equilibrium constant for the decomposition of hydrogen iodide is 65.0. If the initial concentration of HI is 1.60 M, what is the concentration of hydrogen at equilibrium? 2Hl(g) H2(g) + I2(g) A. 1.42 M B. 0.753 M C. 0.240 M D. 0.802 M I think that ...
Sunday, September 18, 2016 by Laura

Chemistry
How many grams of CO2 is produced from 855 grams of C6H12O6 in the process of cell respiration?
Sunday, September 18, 2016 by Anonymous

chemistry
How many grams of FeBr 3 would be present in 150.0 mL of a 0.435 M FeBr 3 solution?
Sunday, September 18, 2016 by lana

Chemistry
an empty graduated cylinder weighs 82.450g. when gilled tp 50.0 mL with a liquid it weighs 110.810g. what is the density of the liquid?
Saturday, September 17, 2016 by Troy

Chemistry
Which of the following has no effect on the rate ofa reaction? a)degree of branching or size of reactant molecules b)value of Heat of reaction c)presence of a catalyst d)temperature of the reactants e) concentrations of the reactants
Saturday, September 17, 2016 by Mike

Chemistry
For the reaction C2H4Br2+ 3KI>C2H4+2KBr+KI3, when the rate of reaction is 2.0x10^-5, what is the rate of disappearance of KI?
Saturday, September 17, 2016 by Mike

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