Sunday
December 4, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
What is happening on a chemical basis, to make them the way they're. 1) magnesium 2)calcium 3)potassium 4)sodium
Friday, October 7, 2016 by Holfbrincl

Organic Chemistry
How many constitutional isomers have the molecular formula C3H6S ?
Friday, October 7, 2016 by Nevaeh

Chemistry
H3C6H5O7(aq) + 3NaHCO3(aq)----Na3C6H5O7(aq) + 3H2O(i) + 3CO2. NaHCO3 = 2.00g H3C6H5O7 = 0.76 CO2 = 0.07g 1.Determine which reactant is the limiting reactant . describe your reasoning. 2. Calculate the theoretical yield of carbon dioxide in the plastic 3. what is the actual ...
Friday, October 7, 2016 by Zaza

chemistry
How many grams silver (Ag) is added to 13 grams gold to produce 85% gold (Au) alloy? Can someone please give me the derived formula to be used? I had managed to solve it though I'm not quite sure if it's correct. i got 73.67g Ag, can someone please correct me if i'...
Friday, October 7, 2016 by Epinephrine

chemistry
Molten Al2O3 is reduced by electrolysis at low potentials and high currents. If 1.5 x 10^4 amperes of current is passed through molten Al2O3 for 8.0 hours, what mass of Al is produced? Assume 100% current efficiency? Mdep = ([1.5 x 10^ x 28800s ]/ 96500) x (26.98/6e) = 20130g ...
Friday, October 7, 2016 by jess

Chemistry
Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen atom D) Charge-to-...
Friday, October 7, 2016 by Mary

Chemistry
calculate the energy needed to warm the melted ice from 0 degrees celsius to the final temperature of the water
Thursday, October 6, 2016 by rosa

chemistry
A 100-watt light bulb 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 525 nm , how many photons are emitted per second? okay so i do: ((6.626*10^-34)(3.00*10^3))/(5.25*...
Thursday, October 6, 2016 by anon yo

Chemistry
Calcium chloride, CaCl2, is used in “hot packs”. When the solid is mixed with water, the products are favored. Based on this information, which of the following is true for the values of ΔH and ΔS for the dissolving process? CaCl2 (s) → Ca2+ (aq) + 2 ...
Thursday, October 6, 2016 by Bear

Chemistry
Ammonium nitrate, NH4NO3, is used in “cold packs”. Which statement best describes why the products are favored, when the solid is mixed with water? NH4NO3(s) → NH4+ (aq) + NO3- (aq) A) Heat is transferred to the surroundings to lower the temperature and the ...
Thursday, October 6, 2016 by Bear

Science,chemistry
How do I write a balanced half ionic equation of aluminium oxide at the cathode?
Thursday, October 6, 2016 by Madlyne

AP Chemistry
Sodium can be extracted by heating naturally occurring salt until it is molten. An electrochemical process is then used to extract the sodium. Cl2 is produced at the anode, and Na is collected at the cathode. 1. Write the half-reactions that occur at the anode and the cathode...
Thursday, October 6, 2016 by Hermela

Chemistry
When excited electron of phosphorus goes in d orbital from p orbital then particularly in which orbital of d (5 coz there are 5 suborbitals in d) that electron goes? And why?
Thursday, October 6, 2016 by Parth

Chemistry
Cobalt metal is added to steel to improve its resistance to corrosion.Calculate no. of moles in a cobalt contain 5×10^20
Thursday, October 6, 2016 by Tamaq

Chemistry
what are dipoles?
Thursday, October 6, 2016 by Anonymous

Chemistry
Is the atomic mass or atomic weight on the periodic table written in grams.
Thursday, October 6, 2016 by lulu

Chemistry
To what volume should 10L of 0.5M CH3COOH (Ka = 1.8×10–5) be diluted in order to double the OH– concentration?
Wednesday, October 5, 2016 by Sandu

Chemistry
Consider the following reactants. Which produces a gas? 1. NH4Cl(aq) + AgNO3(aq) → 2. Na2CO3(aq) + BaCl2(aq) → 3. Na2S(aq) + HCl(aq) → 4. All of these would produce a gas.
Wednesday, October 5, 2016 by Sue

Chemistry
Does helium have an ionic radius? I searched and looked in an old Chem book, and come up empty. Hydrogen is not listed either. Is there a specific reason for this? Thank you.
Wednesday, October 5, 2016 by lulu

Chemistry
What is the molar volume of pure water at 22 degrees Celsius?
Wednesday, October 5, 2016 by Allie

Chemistry
Identify the precipitate(s) of the reaction that occurs when a silver nitrate solution is mixed with a sodium chloride solution. Check all that apply. silver nitrate sodium chloride sodium nitrate silver chloride
Wednesday, October 5, 2016 by Betty

CHEMISTRY PLS HELP
If a sample of red blood cells at an osmotic pressure of 7.70 atm is placed in a solution that contains 0.050M calcium chloride (CaCl2) at 25°C, what is the freezing point of this solution if the density of the solution is 1.50 g/mL
Wednesday, October 5, 2016 by BYU

Chemistry
If 0.0365 mol of CaCl2 is dissolved in water to make a 0.640 M solution, what is the volume of the solution?
Wednesday, October 5, 2016 by Tsomo

Chemistry
1) 2 kg of solid copper is at its melting point. How much energy does it take to melt all the copper? Heat of fusion: 134 J/g Heat of Vaporization 5060 J/g q= mHf I know the equation but I do not understand know if this is correct. 2kg= 2000 grams q=(2000g) (134J/g) q=(2000) (...
Wednesday, October 5, 2016 by John Brown

Chemistry
Calculate normality of 27% H2SO4
Wednesday, October 5, 2016 by Akshay

Chemistry
In the titration of a solution of a weak acid HA with NaOH the pH is 5.0 after 10ml of NaOH solution has been added and 5.6 after 20ml of the NaOH solution has been added. Find the PKa of HA? Pls give some hints to solve this question...
Wednesday, October 5, 2016 by Sandu

chemistry
What is the composition of a methanol () – propanol () solution that has a vapor pressure of 121 torr at 40°C? At 40°C, the vapor pressures of pure methanol and pure propanol are 303 and 44.6 torr, respectively. Assume the solution is ideal. Mole fraction of ...
Wednesday, October 5, 2016 by savanna

chemistry
Pentane (C5H12) and hexane (C6H14) form an ideal solution. At 25oC the vapor pressures of pentane and hexane are 511 and 150 torr, respectively. A solution is prepared by mixing 25 mL pentane (density, 0.63 g/mL) with 45 mL hexane (density, 0.66 g/mL). What is the vapor ...
Wednesday, October 5, 2016 by savanna

chemistry
A solution is made by dissolving 22.9 g urea (), a nonelectrolyte, in 302 g water. (The vapor pressure of pure water is 23.8 torr at 25°C and 71.9 torr at 45°C.) Calculate the vapor pressure of this solution at 25°C. Vapor pressure = torr Calculate the vapor ...
Wednesday, October 5, 2016 by aliza

chemistry
The normal boiling point of methanol is 64.7oC. A solution containing a nonvolatile solute dissolved in methanol has a vapor pressure of 670.0 torr at 64.7oC. What is the mole fraction of methanol in this solution?
Wednesday, October 5, 2016 by rose

chemistry
Glycerin, C3H8O3, is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 159 g glycerin to 338 mL H2O at 39.8oC? The vapor pressure of pure water at 39.8oC is 54.74 torr and its density is 0.992 g/cm3.
Wednesday, October 5, 2016 by rose

chemistry
Calculate the solubility of in water at a partial pressure of of 140. torr at 25°C. The Henry's law constant for is for Henry's law in the form C = kP, where C is the gas concentration (mol/L).
Wednesday, October 5, 2016 by Amber

chemistry
What mass of glycerin (), a nonelectrolyte, must be dissolved in 200.0 g water to give a solution with a freezing point of –0.900°C?
Wednesday, October 5, 2016 by Amber

chemistry
The weight of a china dish with a saturated solution of sodium nitrate at 40°C is 80 g. After evaporating the whole solution the dish's weight along with the crystals is 40 g and solubility of NaNO3 at 40°C is 20 g. What is the weight of empty china dish ?
Wednesday, October 5, 2016 by Anonymous

Chemistry
15.00g of ammonium nitrate decomposes into an expandable container acoording to the following equation. 2NH4NO3 ==> 2N2 g + 4H2O g + O2 g which has the highest partial pressure a. N2 b. H2O c. O2 i am not sure how to approach this problem. is there a simple way to solve ...
Tuesday, October 4, 2016 by Anonymous

Chemistry
Classify the following reactions as precipitation reactions, oxidation-reduction reactions, or acid-base reactions. 1)2NaCl(aq)+K2H2Sb2O7(aq)==Na2H2SbO7(s)+​2KCl(aq) 2)(CH3COO)2Cu(aq)+(NH4)2C2O4(aq)==CuC2O4​(s)+2CH3COONH4(aq) 3)4Al(s)+3O2(g)==2Al2O3(s) 4)2Zn(s)+O2(...
Tuesday, October 4, 2016 by Katelyn

Chemistry
When methane are burned in a bomb calorimeter the temperature rises from 21.00℃ to 25.18℃. The heat capacity of methane is 3.754x10^3 J/℃. The amount of heat, q (in kJ) absorbed by the calorimeter apparatus is: Correct Answer: 18.68 kJ My Work and my answer: ...
Tuesday, October 4, 2016 by Anonymous

Chemistry
B2O3(s) + 3C(s) + 3Cl2 (g) ---> 2 BCl3(g) + 3CO(g) How many moles of chlorine are used up in a reaction that produced 0.35 kg of BCl3 I do not understand please help
Tuesday, October 4, 2016 by Julia

Chemistry
2NO(g) + O2 (g) --> 2NO2 How many grams of NO are required to react fully with 5.00 mol of O2? I do not understand any of this please help
Tuesday, October 4, 2016 by Julia

chemistry
WHAT does it mean for a phase of matter to have a definite shape and volume
Tuesday, October 4, 2016 by tom

Chemistry
The following replicate values were reported for the concentration of magnesium chloride, MgCl2, in mol/L. What value should be reported as the mean concentration of the chloride ion, Cl-, converted to ppm? (You may use the simplified definition of ppm.) 0.00141, 0.00138, 0....
Tuesday, October 4, 2016 by Mr. J

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 24.0 C. After a while the temp 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? How much heat did the water ...
Tuesday, October 4, 2016 by Evan

Chemistry
How many grams of solid KOH must be added to 100ml of a buffer solution which is 0.1M each with respect to the weak acid HA and its potassium salt KA in order to make the pH of the solution 6.0?
Tuesday, October 4, 2016 by Sandu

chemistry
Write the balanced chemical equation for the oxidation of catechol to quinone.
Tuesday, October 4, 2016 by jack

Chemistry
Identify the oxidation-reduction reactions among the following: 1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) 2. 2Na(s) + Cl2(aq) → 2NaCl(s) 3. 2Mg(s) + O2(g) → 2MgO Identify the oxidation-reduction reactions among the following: 1 and 2 only 2 and 3 only 1 and 3 ...
Monday, October 3, 2016 by Beth

Chemistry
1.025g of an impure sample of a weak acid HX(mol mass = 82) is dissolved in 60ml of water and titrated with 0.25M NaOH. When half of the acid was neutralized the pH was found to be 5.0 and at the equivalence point the pH is 9.0. Find the % purity of this sample of HX Pls help...
Monday, October 3, 2016 by Sandu

Chemistry
0.299 g of NH4Cl is dissolved in 50.0 ml then titrated against 0.205 M NaOH. Calculate the pH at the equivalent point
Monday, October 3, 2016 by Venessa

Chemistry
Base = NaOH, 0.084 M drips 2ml at a time Acid = Phenol, KA=1.3*10^-10 You have 28.0 ml in flask, and it is 0.06 M How would you find the molarity and moles of OC6H5-1
Monday, October 3, 2016 by John

Chemistry
Calculate the value of Z and its absolute standard deviation. All standard deviations shown are absolute. Show your work and report the standard deviation in the result with two significant digits (to confirm the correct result). Z = (1.18+/-0.07)x((2.21+/-0.05)^3)
Monday, October 3, 2016 by Adam

Chemistry
What two facts did Newton need to be able to calculate the acceleration of the Moon?
Monday, October 3, 2016 by Betty

Science (Chemistry) (Measurement Uncertainty)
Three students are asked to determine the mass of a coon. They each measure different values for the mass of the coin using a balance. Student A recorded a mass of 63.08g, student B recorded a mass of 63.022g and student C recorded a mass of 63.0328g. If the balance is ...
Monday, October 3, 2016 by Ray

Chemistry
A beaker of nitric acid is neutralized with calcium hydroxide. Write a balanced molecular equation and a net ionic equation for his reaction
Monday, October 3, 2016 by Amy S

Chemistry
What effect does the presence of an impurity have on the freezing point of a liquid?
Monday, October 3, 2016 by QuickName

Chemistry Lab
Number of moles of HCl and Na2CO3 (show calculations) when 0.015 g of Na2CO3. How can I calculate this problem if I am only given the 0.015 grams of Na2CO3?
Monday, October 3, 2016 by Julissa

CHEMISTRY
15.0g of KCLO3 was crushed and heated with about 0.1g of MnO2.Write an equation for the reaction.
Monday, October 3, 2016 by CHI

Chemistry
When an electric current passes through water during the process of electrolysis, two gases are formed. One gas has a boiling point of -183 C and the other has a boiling point of -253 C. Has a physical change or chemical change occurred? Explain. I think it is a chemical ...
Monday, October 3, 2016 by Sami

Chemistry
Write the formulas of the compounds formed by NH4+ with the following anions: NO3−, HCO3−, SO42−, HPO42−. Express your answers as chemical formulas separated by commas. Use the given order of anions.
Monday, October 3, 2016 by Morgan

chemistry
what is the pH of a solution prepared by adding 0.65mol of LiOH(aq) to 1.0L of 0.30mol/L HNO3(aq)>
Monday, October 3, 2016 by bryant

Chemistry
A student does a standard addition experiment by pipetting 25 mL of unknown, adding ferrous ion spikes and reagents, into a 100 mL volumetric flask and making up to the mark. The equation of the line has a slope of 0.103 and an intercept of 0.135 when the unit of concentration...
Monday, October 3, 2016 by Adam

Chemistry
Each increase in pressure of 100 atm decreases the melting point of ice by about 1.0¡ÆC. Q. One possible explanation of why a skate moves smoothly over ice is that the pressure exerted by the skater on the ice lowers its freezing point and causes it to melt. The ...
Monday, October 3, 2016 by KK

Chemistry
An Unknown Compound (M=60.09 g/mol) is composed of Carbon, Hydrogen and Oxygen. Combustion of 0.255 g of the unknown compound produces 0.561 g Carbon Dioxide and 0.306 g of Water. Determine the molecular formula of the compound.
Monday, October 3, 2016 by John

General Chemistry
A typical human adults exhales 500 mL of air per breath. At this rate, calculate the volume of air exhaled after 20 breaths in units of cubic meters.
Sunday, October 2, 2016 by Anonymous

Chemistry
Calculate the amount of energy released in the formation of one mole of MgSe bonds (not lattice energy). The radius of the magnesium ion is 0.65 Å, and the radius of the selenide ion is 1.98 Å. Note that 1Å=10^−10m. I know I need to use the formula E=k(...
Sunday, October 2, 2016 by Makayla

Chemistry
What mass of Na2S is produced when 20g of sodium reacts with excess sulfur?
Sunday, October 2, 2016 by rei

Chemistry
Ammonia (NH3) reacts with oxygen to produce nitric oxide (NO) and water (see balanced equation below). How many grams of oxygen do you need to react with 21.4 g ammonia? __4_NH3 + __5_O2 → __4_NO + _6__H2O
Sunday, October 2, 2016 by Richard

Chemistry
can you please please help me with these questions I don't know how to do any of them. I know how to calculate moles and grams and mole ratio,etc but I don't understand the limiting excess reactant and yield stuff. Thanks! 1.In the following chemical reaction, how many...
Sunday, October 2, 2016 by molly

Chemistry
To prepare a solution of NaCl, you weigh out 2.634 (0.002)g and dissolve it in a volumetric flask whose volume is 100.00 (0.08) mL. Express the molarity of the solution, along with its uncertainty.
Sunday, October 2, 2016 by Taylor

Chemistry
can you please please help me with these questions I don't know how to do any of them. I know how to calculate moles and grams and mole ratio,etc but I don't understand the limiting excess reactant and yield stuff. Thanks! 1.In the following chemical reaction, how many...
Sunday, October 2, 2016 by molly

AP Chemistry
A 12.8 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 21.3 g. What was the mass of iron in the sample of ore? Answer in units of g.
Sunday, October 2, 2016 by Hayd

Chemistry
Identify the oxidation-reduction reactions among the following: 1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) 2. 2Na(s) + Cl2(aq) → 2NaCl(s) 3. 2Mg(s) + O2(g) → 2MgO 1 and 2 only 2 and 3 only 1 and 3 only All of 1, 2, and 3 None of 1, 2, and 3
Sunday, October 2, 2016 by Jessica

Chemistry
The mass of potassium iodate (KIO3) contained in an impure sample was determined by titration with sodium thiosulfate (0.1005 M). The impure KIO3 was dissolved in 50 cm 3 of water, an excess of potassium iodide (KI) and 5 cm^3 of dilute sulphuric acid was then added. At the ...
Sunday, October 2, 2016 by Gemma

Chemistry
Prepare 30mL of a stock KI soln by mixing 10.0mL of the 0.03M KI in 0.2M KNO3 with 20.0mL of the .2M KNO3 Determine the concentration of the iodide ion. What does it mean by the 0.03M KI in 0.2M KNO3? Is this just bad wording of the question? Am I just mixing the 10.0mL of ....
Sunday, October 2, 2016 by Maddy

Chemistry
A student prepares a soln that is initally 0.006M Pb2+ and 0.00450M I-. This soln is placed into a 1.00cm wide cuvet and inserted into the spectrometer producing as abosrbance reading of 0.430 at a wavelength of 456nm. What is the equilibrium concentration of the iodide ions ...
Sunday, October 2, 2016 by Maddy

Chemistry
What specific evidence from the gold foil experiement led Rutherford to come to each of the following conclusions? The nucleus occupies very little space in the atom. Answer:He shot alpha particles through thin sheet of gold and discovered some were deflected An atom is made ...
Sunday, October 2, 2016 by Anonymous

chemistry
A 1.60 g sample of a mixture of naphthalene, C10H8, and anthracene, C14H10, is dissolved in 20.0 g benzene, C6H6. The freezing point of the solution is 2.81oC. What is the composition as mass percent of the sample mixture?
Sunday, October 2, 2016 by byu

Chemistry
3. What experimental problems would confront you if you attempted to determine the concentration of the metal ions in solutions of each of the following reagents? a. Cr +3 which has a maximum absorbance at 407 nm with absorbtivity of 15 M -1 cm -1 and another at 574 nm with ...
Sunday, October 2, 2016 by Lauren

chemistry
How can values of heats of formation found in tables be used to calculate heats of reactions? I am having a really hard time understanding this.
Sunday, October 2, 2016 by laura

Chemistry
Calculate the amount of energy released in the formation of one mole of MgSe bonds (not lattice energy). The radius of the magnesium ion is 0.65 Å, and the radius of the selenide ion is 1.98 Å. Note that 1Å=10^−10m. I know I need to use the formula E=k(...
Sunday, October 2, 2016 by Makayla

chemistry
How much energy is required to make H2O(g) from H2O(l)? Basically this deals with bond energies and heats of formation. But I'm not sure how to find it
Sunday, October 2, 2016 by laura

chemistry
What is n+1+m for 4p orbital and what is n+l+m for 4p orbital
Sunday, October 2, 2016 by sanjay

chemistry
For a skydiver jumping out of a plane at an altitude of 1 km, what would be the concentration of oxygen in his (or her) blood knowing that air pressure at 1 km drops to 89,874 Pa? Assume ideal behavior of gases, normal breathing, 25 °C and constant air composition. Hint: ...
Sunday, October 2, 2016 by carlos

CHemistry
What is the molecular formula of glycerol (a compound containing C, H, and O) from the following combustion analysis: when 2.00 g glycerol are combusted, 2.865 g CO2 and 1.564 g H2O are recovered. I already found uts molar mass its 92g/mol
Sunday, October 2, 2016 by byu

Analytical chemistry
A solution is created using 2.1700 grams of Calcium Hydroxide (MW is 74.093) in a 1L volumetric flask. A 50 mL aliquot is then taken and aded to a 350 mL volumteric flask and filled to the line. Finally, a 10 aliquot of the that solution is taken and added to a 100 mL ...
Sunday, October 2, 2016 by Sam

Analytical chemistry
0.6140 grams of sodium phosphate (Na3PO4) was dissolved in 2 L of water to make a stock solution. 34 mL of this solution is then diluted to 100mL volumetrically to prepare the final solution. Calculate the molarity of phosphate ions in this solution. Answer to 5 decimal places.
Sunday, October 2, 2016 by Sam

CHEMISTRY
calculate the weight of co2 by complete combustion of 1.5 \g of ethane
Sunday, October 2, 2016 by ATHARV Singh

Chemistry
In a titration 100 mL of 3.65 g HCl is added to 200 mL of BA(oh)2 solution of an unknown concentration until the equivalent point find molarity of ba(oh)2
Sunday, October 2, 2016 by Me

Chemistry
A handbook gives the heat of combustion of liquid carbon disulfide as -3.42 kcal/g of the liquid. Write the equation representing the combustion of 1 mol of carbon disufide and the accompanying ΔH value. (hint: the sulfur containing combustion product is sulfur dioxide).
Saturday, October 1, 2016 by Anonymous

Chemistry
Calculate the heat capacity of a sample of radiator coolant if a temperature rise from 5 to 107℃ requires 932 J of heat. My work: c=q/mΔT c=932J/(?)(107℃-5℃)
Saturday, October 1, 2016 by leana

Chemistry
Tin and purple Iodine combine to form an orange solid tin iodide compound. If the compound contains 0.00383 moles of Sn and 0.01534 moles of I, what is its' empirical formula?
Saturday, October 1, 2016 by Kirstin

chemistry
I got this question wrong it was true/false the answer was false A supersaturated solution will have some solid undissolved in the bottom of the container. I don't know why its false?
Saturday, October 1, 2016 by byu

Chemistry
I'm doing online homework and the follow question has come up: Write the formulas of the compounds formed by Pb4+ with the following anions: NO3−, ClO3−, SO32−, H2PO4−. Express your answers as chemical formulas separated by commas. Use the given ...
Saturday, October 1, 2016 by CeeCee

chemistry
List the following strong electrolytes solutions in order of increasing boiling point. a. 0.1 M CaCl2 b. 0.1 M AlCl3 c. 0.1 M CaS
Saturday, October 1, 2016 by carlos

chemistry
 If we combine nitrous oxide (NO, laughing gas) with oxygen (O2) we produce nitrogen dioxide (NO2) according to the following reaction: 2NO + O2→ 2NO2 How many grams of NO2 will be produced when 5.00 moles of NO react?
Saturday, October 1, 2016 by shania

chemistry
A solution containing 40 g of calcium bromide requires 14.2 g of chlorine to react completely with it and 22,2 g of calcium chloride is produced in addition to ehaever bromine is obtained. How many grams of calcium bromide are required to produce 10.0 pounds of bromine?
Saturday, October 1, 2016 by allen

chemistry
Calculate the normality of solution containing 4g of sodium hydroxide present in 1 litre of solution ?
Saturday, October 1, 2016 by sowmiya

CHEMISTRY
I'm trying to figure out the percent composition of a mixture of an unknown (a combination of NaHCO3 and NaCl). Here's my data: Mass of 150mL of empty beaker: 80.937g Mass of 150mL beaker w/ unknown: 81.957g Mass of 150mL beaker w/ unknown after reaction: 89.126g Mass ...
Saturday, October 1, 2016 by Liam

Chemistry
To clarify, a triple bond between carbon and oxygen is more stable than a triple bond between carbon and nitrogen because oxygen is more electronegative. Is my understanding correct?
Friday, September 30, 2016 by Vivian

chemistry
is heating iodine from its solid state to a liquid state a chemical or physical change?
Friday, September 30, 2016 by brandon

chemistry
how many joules of heat are required to heat 149g of aluminum from 31.0 celcius to 75.5 celsius
Friday, September 30, 2016 by katie

Chemistry
I was given a solution of HCOOH with hand approximate concentration of 0.20 moles and I need to titrate this with a 0.110 V mol of NaOH. If I add 20 milliliters of hcooh to the beaker before I titrate approximately what volume of NaOH will be required to reach the endpoint?
Friday, September 30, 2016 by Kabw

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