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July 4, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Procedure 0) The sodium phosphate, Na3PO4 solution has NPFA ratings of 1 (out of 4) for health, 0 for fire, and 0 for reactivity. Cobalt (II) nitrate has 2 for health, 0 fire, and 0 for reactivity. 1) Carefully label (1-­‐6) and weigh 6 small test tubes. 2) You will ...
Sunday, March 1, 2015 by Chem

Chemistry
A standard KHP solution is made by dissolving 2.12 grams of KHP in 100.00 mL of water. The KHP solution is then titrated with NaOH solution. It takes 23.12 mL of NaOH to reach the endpoint. What is the concentration of the NaOH?
Sunday, March 1, 2015 by Anonymous

Quick chemistry help
Please help with these two problems! 1. 566g of C12H22O11=______ C atoms 2. 12 molecules chlorine gas= ________ atoms of Cl
Sunday, March 1, 2015 by Anonymous

Chemistry combined gas law
Can someone tell me if I did this combined gas law problem correctly? What would happen to the volume of a container whose initial volume is 21.5 L at STP (standard pressure) and is introduced to conditions of 93.2 kPa and 333 K? Formula: P1 x V1 / T1 = P2 x V2 / T2 V2 = P1 x ...
Sunday, March 1, 2015 by Theresa Kwnt

Chemistry
If I have 50.0 mL of HA at a concentration of 1.20M and 50.0 mL of NH4OH at a concentration of 0.92M, how many moles of the limiting reactant are there? I guess I should start with a balanced equation, but I have no idea where to start..
Sunday, March 1, 2015 by Sara

chemistry
What volume of ammonia gas at STP is required to neutralize 40 cubic centimetres of 2 Molar sulphuric acid?
Sunday, March 1, 2015 by Czar

Organic Chemistry
How to find the crude percent, percent recovery, and percent composition of benzoic acid and acetanilide if 2 grams of a mixture of benzoic acid and acetanilide was separated through separatory funnel and recrystallize and purified, but only 0.7g of benzoic acid was used to be...
Sunday, March 1, 2015 by Siannah

CHemistry
What is the pH of the resulting solution when 0.20 mole of NaF and 0.05 mole HCl are added to 100 mL water? The Ka for HF is 3.95x10^-4M
Sunday, March 1, 2015 by Mike

chemistry
What is the ph of 0.25 M tartaric acid? Ka=2.5*10^-5M
Sunday, March 1, 2015 by brad

Chemistry
Discuss how your supernatant color in the 6 different test tubes supports your calculated result in #2. For example, if you used less than the volume of sodium phosphate calculated in #2, what would be the limiting reactant and does the observed supernatant color support this.
Sunday, March 1, 2015 by Chem

Chemistry
A 45.4 grams of a gold metal sample was heated with the amount of energy of 228 J. Which of the following would the most plausible temperature change of the gold sample? The specific heat of gold is 0.131 J/g.oC. 12.8 oC to 38.3 oC 24.4 oC to 81.6 oC 23.8 oC to 62.1 oC 38.3 oC...
Saturday, February 28, 2015 by Heather

chemistry
One of the ways to produce iron is to take iron(II) oxide and react it with carbon monoxide to get pure iron and carbon dioxide. The reaction is FeO(s) + CO(g) = Fe(s) + CO2(g). What is the partial pressure of CO2(g) if 2.00 atm of CO and excess iron(II) oxide are used to ...
Saturday, February 28, 2015 by danny

Chemistry
What is the uncertainty (+/- ?) of molar concentration (M)?
Saturday, February 28, 2015 by Anonymous

chemistry
Lead iodide is a relatively insoluble compound. It can dissolve from the solid phase into the aqueous phase with a Keq of 0.00027. If the concentration of lead iodide in the aqueous phase 0.125 M, then: a. we need more information to determine the progress of the reaction. b. ...
Saturday, February 28, 2015 by danny

chemistry
Equilibrium is: a dynamic condition in which the concentration of the reactants is equal to the concentration of the products. a static condition in which the concentration of the reactants is equal to the concentration of the products. a static condition in which the rate of ...
Saturday, February 28, 2015 by danny

chemistry
Hi Please ... is the absolute temperature equal temperature in kelvin? Thanks for you
Saturday, February 28, 2015 by doa'a

Chemistry
Acetone is one of the most important solvents in organic chemistry, used to dissolve everything from fats and waxes to airplane glue and nail polish. At high temperature, it decomposes in a first order process to methane and ketene (CH2=C=O).At 600C, the rate constant is 8....
Saturday, February 28, 2015 by Munavvar

Chemistry
Even when a mechanism is consistent with the rate law , later experimentation may it to be incorrect or only one of several alternative. As an example, the reaction between hydrogen and iodine has the following rate law: rate=k[H]^3[I]2. The long accepted mechanism proposed a ...
Saturday, February 28, 2015 by Munavvar

Chemistry
At body temperature (37C), K of an enzyme-catalyzed reaction is 2.3x10^14 times greater than k of the uncatalyzed reaction. Assuming that the frequency factor A is the same for both reaction, by how much does the enzyme the E^a?
Saturday, February 28, 2015 by Munavvar

Chemistry
A principle of green chemistry is that the energy requirement of industrial processes should have minimal environmental impact. How can the use of catalysts lead to "greener" technology?
Saturday, February 28, 2015 by Munavvar

Chemistry
Need Help! 1. Ammonia is produced by the reaction of hydrogen and nitrogen. N2(g)+3H2(g)→2NH3(g)ammonia How many moles of N2 reacted if 0.65mole NH3 is produced? How many moles of NH3 are produced when 1.2moles H2 reacts? 2.In the acetylene torch, acetylene gas (C2H2) ...
Saturday, February 28, 2015 by Jennie

Chemistry
Define the-half of a reaction. Explain on the molecular level why the half- life of a first-order reaction is constant
Saturday, February 28, 2015 by Munavvar

Chemistry
If the temperature in problem 16.60 (25C), by what factor does the fraction of collisions with energy equal to or greater that the activation energy change?
Saturday, February 28, 2015 by Munavvar

Chemistry
Define the-half of a reaction. Explain on the molecular level why the half- life of a first-order reaction is constant
Saturday, February 28, 2015 by Munavvar

Chemistry
For the reaction 4A (g)+3B (g)=C(g) the following data were obtained at constant temperature: Experiment- 1. Initial (A) (mole/L) 0.0500, 01000, 01000 , 0.0500 2. Initial (B) (mole/L) 0.0500, 0.0500, 0.1000, 0.0500 3. Initial (C)(mole/L) 0.0100, 0.0100, 0.0100, 0.0200 Initial ...
Saturday, February 28, 2015 by Munavvar

Chemistry
You are staying the reaction A2 (g)+B2 (g)=2AB (g) To determine its rate law .Assuming that you have a valid experimental procedure for obtaining (A2)& (B2) at various times, explain how you determine (a)the initial, (b) the reaction order, & (c) the rate constant?
Saturday, February 28, 2015 by Munavvar

Chemistry
Consider the uni molecular reaction cyclopropane? Propylene. The value of log A for high pressure limit is 15.17. Calculate the value of S? For the reaction. Calculate the contribution of S trans in the above reaction at 298K?
Saturday, February 28, 2015 by Munavvar

Chemistry
The magnetic moment (mu) values for Cs2 (MnCl4), k4 (Mn (CN) 6) and K2 (Ni (CN) 4) are 5.9 , 1.8 and 0 B.M, respectively. Explain the difference of these values based on the Valence bond theory.?
Saturday, February 28, 2015 by Munavvar

Chemistry
Vapour pressure of ideal solutions at 25c the vapour pressure of chloroform and carbon tetrachloride are 26.54 and 15.27 kpa respectively. If the liquids from ideal solutions. (A) what is the composition of the vapour in equilibrium with with a solution containing 1mol of each...
Saturday, February 28, 2015 by Munavvar

Chemistry
how many moles of solid mg(oh)2 should you ad to 200 ml of .15M acetic acid solution to produce ph 4.0 buffer?
Saturday, February 28, 2015 by Munavvar

Chemistry Help
How many moles of H2 and N2 can be formed by the decomposition of 0.250 mol of ammonia, NH3? Is it 0.250*3mol H2=0.75 0.25*1mol N2=0.25 Am I correct?
Saturday, February 28, 2015 by Matthew

chemistry
50.0 mL of a solution of HCl is combined with 100.0 mL of 1.15 M NaOH in a calorimeter. The reaction mixture is initially at 22.4°C and the final temperature after reaction is 31.2°C. What is the molarity of the HCl solution? You may assume that there is an excess of ...
Saturday, February 28, 2015 by Marcus

chemistry 2
For the simple decomposition reaction below, rate = k[AB]2 and k = 0.30 L/mols. AB(g) A(g) + B(g) If the initial concentration of AB is 1.20 M, what is [AB] after 10.0 s?
Saturday, February 28, 2015 by Anonymous

Chemistry
Phosphorous acid, H3PO3, is actually a diprotic acid for which Ka1 = 5.0 × 10-2 and Ka2 = 2.0 × 10-7. What are the values of [H+] and [H2PO3-] in a 2.0 M solution of H3PO3?
Friday, February 27, 2015 by Jen

Chemistry
Calculate the pH of a 0.033 M solution of sodium ascorbate, Na2C6H6O6. For ascorbic acid, H2C6H6O6, Ka1 = 7.9 × 10-5 and Ka2 = 1.6 × 10-12. Kb = 1E-14 / 7.9E-5 = 1.266E-10 I 0.033 0 0 C -x +x +x E 0.033-x x x x^2/-0.033 = 1.266E-10 x = 2.044E-6 pOH= -log(2.044E-6...
Friday, February 27, 2015 by Is my answer right?

Chemistry
I'm having a brain malfunction... how to calculate how many grams are in a mole of something? How many grams are in 3.80mol of sodium chloride (NaCl)?
Friday, February 27, 2015 by Jennie

Chemistry
A reaction proceeds with ∆ H = 40 kJ/mol. The energy of activation of the uncatalyzed reaction is 120 kJ/mol, whereas i t is 55 kJ/mol for the catalyzed reaction. How many times faster is the catalyzed reaction than the uncatalyzed reaction at 25°C?
Friday, February 27, 2015 by Jessica

Chemistry Help
How many milliliters of 0.534 M Ba(OH)2 solution are needed to completely neutralize 34.5 mL of 0.220 M HBr solution? The reaction is Ba(OH)2(aq) + 2HBr(aq) → BaBr2(aq) + 2H2O(l) I did 0.0345 * 0.220 = 0.00759 Moles of HCl =2*0.00759= 0.01518 0.01518*1000= 15.18 mL ...
Friday, February 27, 2015 by Matthew

Chemistry
Calculate the hydrogen ion concentration, [H+], in 0.00988 M Ba(OH)2. Careful!
Friday, February 27, 2015 by JUNDY

Chemistry
The autodissociation of water to H+ and OH- is endothermic. At a higher temperature more of the water molecules have sufficient energy to dissociate. So, Kw is greater. At 25oC, Kw = 1.0 x 10-14. (standard Kw) At 65oC, Kw = 1.0 x 10-13. Calculate the hydrogen ion concentration...
Friday, February 27, 2015 by JUNDY

Chemistry
Ammonia is produced by the reaction of hydrogen and nitrogen. N2(g)+3H2(g)→2NH3(g)ammonia How many moles of N2 reacted if 0.65mole NH3 is produced? How many moles of NH3 are produced when 1.2moles H2 reacts?
Friday, February 27, 2015 by Jennie

Chemistry
Ok, I know how to balance chemical equations, however, I don't know how to tell if it is a S, L, aq, or g? How am I supposed to know this?? Mg(s)+AgNO3(aq)→Mg(NO3)2(aq)+Ag(s)​ Express your answer as a chemical equation. Identify all of the phases in your answer...
Friday, February 27, 2015 by Jennie

Chemistry
Dr. Bob222, Calculate the moles of C2H6 in 8.60×1023 molecules of C2H6. I did what you said, I got 8.60*10^23*(1mole/6.02*10^23) = 1.43*10^46??? This is not the answer.. am I doing something wrong?
Friday, February 27, 2015 by Jennie

Chemistry
UMM.. I keep coming up with the wrong answer? How do I calculate this? 1. Calculate the number of Li atoms in 9.9 moles of Li. Express your answer using two significant figures. 2. Calculate the number of CO2 molecules in 3.13×10−2 mole of CO2. 3.Calculate the ...
Friday, February 27, 2015 by Jennie

chemistry
how do i plot the gibbs isotherm equation in excel given concentration and surface tension? I'm looking for surface excess which is the slope on the graph, the equation is r=1/RT(dST/dln(c)), ST is the surface tension. Do I plot the ln of the concentration versus the ...
Friday, February 27, 2015 by marnie

Chemistry
Determine the percent ionization of a 2.45 M solution of benzoic acid
Friday, February 27, 2015 by Gabby

Chemistry
Using a 0.20 M phosphate buffer with a pH of 6.7, you add 0.71 mL of 0.55 M HCl to 52 mL of the buffer. What is the new pH of the solution?
Friday, February 27, 2015 by Ashlee

Chemistry
You are instructed to create 200. mL of a 0.27 M phosphate buffer with a pH of 7.8. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H2O(l) equilibrium reaction arrow ...
Friday, February 27, 2015 by Ashlee

chemistry
For the reaction: 2SO2(g) + O2(g) = 2SO3(g) conducted at 25°C and 1 atm. Calculate H°, S°, G°
Friday, February 27, 2015 by P

Chemistry
True of False, Amorphous solids have crystal structures.
Friday, February 27, 2015 by Tony

Chemistry Need Help
Given the chemical equation, Cl2 + F2 2ClF, how many moles of ClF are produced in the reaction, if 1.50 moles Cl2 are made to react with 1.75 moles F2 ? I got the answer 3.50 moles but it was wrong. Can anyone help me please.
Friday, February 27, 2015 by Matthew

Chemistry
Propanoic acid that, along with its sodium salt, can be used to make a buffer that has a pH of 5.25. If you have 532.9 mL of a 0.250 M solution of that acid, how many grams of the corresponding sodium salt do you have to dissolve to obtain the desired pH?
Friday, February 27, 2015 by Dinna

Chemistry Help
The theoretical yield of Cl2 that could be prepared by mixing 15.0 g of manganese dioxide (MnO2) with 30.0 g of HCl is 12.2 g. The limiting reagent was MnO2. When the reaction was run only 8.82 g of Cl2 was collected. The percent yield of Cl2 is_? a)58.8 % b)72.3 % c)29.4 % d)...
Friday, February 27, 2015 by Alex

Chemistry
When 0.500 moles of boron trichloride react with 1.20 moles hydrogen gas to produce elemental boron and hydrogen chloride gas, the actual yield of boron was 66.4 % of the theoretical yield. The mass of boron obtained was _____ g. Please help I'm stuck on it.
Friday, February 27, 2015 by Matt

chemistry
Consider a sample of a hydrocarbon (a compound consisting of only carbon and hydrogen) at 0.959 atm and 298 K. Upon combusting the entire sample in oxygen, you collect a mixture of gaseous carbon dioxide and water vapor at 0.755 atm and 375 K. This mixture has a density of 0....
Friday, February 27, 2015 by Jaxx

chemistry
You made 100.0 mL of a lead(II) nitrate solution for lab but forgot to cap it. The next lab session you noticed that there was only 84.8 mL left (the rest had evaporated). In addition, you forgot the initial concentration of the solution. You decide to take 2.00 mL of the ...
Thursday, February 26, 2015 by JA

chemistry
The rate of removal of Aspirin from the body is a first order reaction with a rate constant,k = 0.34/h How long does it takes for 87.5% of Aspirin to be removed from the body?
Thursday, February 26, 2015 by Mika

chemistry
Sodium nitrate reacts with copper (II) hydroxide. I know how to write it down: NaNo3+CuOH2----> NO REACTION The problem is that I don't understand why it's no reaction I know it's double replacement and we have to look at activity series of metal to figure out ...
Thursday, February 26, 2015 by sakura

Chemistry help
2. How would it be affective if there were a lot of saliva left in the gum after chewing?
Thursday, February 26, 2015 by Anonymous

Chemistry, HELP!
Molybdenum (Mo) is a heavy metal that can have severe health effects on humans and animals. Tailings from a mining operation in Colorado have polluted surface waters used by grazing animals with Mo. Based on the following information determine the concentration of the three Mo...
Thursday, February 26, 2015 by Ethan

Quick chemistry help
How would I find the number of atoms in this mole statement? 12 molecules chlorine gas=_______ atoms of Cl
Thursday, February 26, 2015 by Anonymous

Chemistry Equilibrium
1.15 g oh h2O (density 1.00 g/ml) is introduced into an empty 1.00 L container. The seled container is heated to 412 K and .150 moles of O2 (g) is present at equilibrium. A. Wrte the equilibrium expression for the reaction above. B. Calculate the equilibrium concentration (in ...
Thursday, February 26, 2015 by Lola

Chemistry to DrBob222
DrBob222 You are an amazing person! I have received more help from you the past two days that I have this whole semester from my instructor! You have an amazing gift of breaking things down to understand completely! Where are you from? Do you get paid for this somehow? look me...
Thursday, February 26, 2015 by Jennie

solution making/ chemistry/biotech
You have 750ml's of a solution that was originally made up using a 20X stock. How much stock was used? I think the answer is 37.5 by dividing 750/20 but I am not sure
Thursday, February 26, 2015 by frank

chemistry
why does HF have a boiling point of 19°c and H2O 100°c
Thursday, February 26, 2015 by prechi

Chemistry
Ok, Need some more help... This is what I have so far. 4. Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide. The byproduct is water. 637.2g of ammonia are reacted with 787.3 g of carbon dioxide. molar mass:NH3=17 CO2=44 CO(NH2)2=60.1 a. (10 points) Write a ...
Thursday, February 26, 2015 by Jennie

Chemistry Drbob222
Dr. Bob222 Please don't get frustrated with me, I'm really trying to figure this out... UGH!! I'm starting over again... Please advise... . Consider the following chemical equation: TiCl4(g) + 2Mg(l) → Ti(s) + 2MgCl2(l) 3.54×107g of TiCl4(g) were ...
Thursday, February 26, 2015 by Jennie

Chemistry! Please Help!
Lime (CaO) is used to prevent SO2 from escaping smokestacks of coal burning power plants by the formation of solid CaSO4•2H2O also known as the mineral gypsum. One of the important reactions in the overall process is the dissociation of CaCO3(s). b. If a 12.0 g sample of ...
Thursday, February 26, 2015 by Michelle

Chemistry
Ok, Need some more help... This is what I have so far. 4. Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide. The byproduct is water. 637.2g of ammonia are reacted with 787.3 g of carbon dioxide. molar mass:NH3=17 CO2=44 CO(NH2)2=60.1 a. (10 points) Write a ...
Thursday, February 26, 2015 by Jennie

Chemistry
Dr. Bob222 Please don't get frustrated with me, I'm really trying to figure this out... UGH!! I'm starting over again... Please advise... . Consider the following chemical equation: TiCl4(g) + 2Mg(l) → Ti(s) + 2MgCl2(l) 3.54×107g of TiCl4(g) were ...
Thursday, February 26, 2015 by Jennie

Chemistry
A volume of 80.0mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water. If the final temperature of the system is 21.20 ∘C , what is the mass of the steel bar? Use the following values: specific heat of ...
Wednesday, February 25, 2015 by Billy

chemistry
a mixture of NaCl and sucrose that has a combined mass of 10.20g is dissolved in enough water to make up to a 250mL solution. osmotic presdure of solution is 7.32atm at 23℃. calculate the mass percent of NaCl
Wednesday, February 25, 2015 by susan

Chemistry
Make 50.0 mL of a 0.500 M solution of acetic acid (CH3COOH) from the 1.00 M CH3COOH using a 50.0 mL graduated cylinder. 1. Show your calculations and explain how you made the acetic acid solution.
Wednesday, February 25, 2015 by Kate

chemistry
A sample of oxygen that occupies 2.5 × 10−6 mL at 508 mm Hg is subjected to a pressure of 1.2 atm. What will the final volume of the sample be if the temperature is held constant? Answer in units of mL
Wednesday, February 25, 2015 by Anna

Quick chemistry check
Please check each of these mole statements. Correct me if I'm wrong! 1. 59g of hydrochloric acid (HCL)=____moles I got 1.6 moles 2. 4.6 moles of sodium hydroxide (NaOH)=___ grams I got 184 grams 3. 35.0 of sulfuric acid (H2SO4)=__ f.u sulfuric acid I got 2.15x10^25th power...
Wednesday, February 25, 2015 by Anonymous

Chemistry help
given 2.01x10^23power molecules of carbon dioxide, how many moles of co2 do you have? How many grams of carbon dioxide would this be? I need help!!
Wednesday, February 25, 2015 by Anonymous

Quick chemistry check
Indicate whether each of the following statements is true or false. 1. One mole of NH3 weighs more than one mole of H2O IS this false 2. There are equal numbers of hydrogen atoms in one mole of H2 and one mole of H20. Is this true? 3. There are more hydrogen atoms in 2 moles ...
Wednesday, February 25, 2015 by Anonymous

chemistry
Hydrogen fluoride has a boiling point of 19 degree Celsius whereas water has a boiling point of 100 degree Celsius...... Explain
Wednesday, February 25, 2015 by lawrenzo

chemistry
The following equilibrium exists in a closed container: N2(g) + O2(g) = 2NO(g), ΔH = +181 kJ/mol. Which of the following perturbations would favor the formation of NO(g)? (practice MCAT question from The Princeton Review MCAT Science Workbook, 2009 edition) increasing the...
Wednesday, February 25, 2015 by danny

chemistry
What volume of oxygen gas can be collected at 0.565 atm pressure and 48.0◦C when 42.9 g of KClO3 decompose by heating, according to the following equation? 2 KClO3(s) ∆−−−−͛​4;2KCl(s) + 3O2(g) MnO2
Wednesday, February 25, 2015 by Anon

chemistry
Suppose you have the following reaction at equilibrium: N2(g) + 3H2(g) = 2NH3(g), ΔH = −22 kcal/mol What changes are expected to occur if the temperature of the system was decreased. You may select multiple answers. The concentration of NH3(g) would decrease The ...
Wednesday, February 25, 2015 by danny

chemistry
1) C2H2O4(aq) = H+ (aq) + C2HO4- (aq); Keq = 6.5E-2 2) C2O42- (aq) + H+ (aq) = C2HO4- (aq); Keq = 1.64E+4 then what is the equilibrium constant for the following reaction: C2H2O4(aq) = 2H+ (aq) + C2O42- (aq)? Keq = 1070 Keq = 227 Keq = 2.21E-4 Keq = 3.96E-6 Keq = 6.30E-3
Wednesday, February 25, 2015 by danny

Chemistry Pre-AP
What volume of oxygen gas can be collected at 0.565 atm pressure and 48.0◦C when 42.9g of KClO3 decompose by heating, according to the following equation? 2 KClO3(s) ∆−−−−͛​4;2KCl(s) + 3O2(g) MnO2
Wednesday, February 25, 2015 by Sara

Chemistry
What volume of oxygen gas can be collected at 0.565 atm pressure and 48.0◦C when 42.9 g of KClO3 decompose by heating, according to the following equation? 2 KClO3(s) ∆−→MnO2 2KCl(s) + 3O2(g)
Wednesday, February 25, 2015 by Abby

chemistry
How much H2 gas at STP can be produced by the reaction 2 Na(s) + 2 H2O(ℓ)heat−→ H2(g) + 2 NaOH(aq) of 3.90 g of Na and excess water? Answer in units of L.
Wednesday, February 25, 2015 by Abby

Chemistry
A solution that contains a large amount of salt and a small amount of water is said to be a _______ solution. A. unsaturated B. saturated C. dilute D. concentrated im pretty sure its C
Wednesday, February 25, 2015 by Dave

Chemistry
Are solutions of the following salts acidic, basic, or neutral? For those that are not neutral, write balanced chemical equations for the reactions causing the solution to be acidic or basic. a.C5H5NHCLO4 b.NH4NO2 c.KOCL d.NH4OCL
Wednesday, February 25, 2015 by Anonymous

chemistry
The pollutant NO is formed in diesel engines. The reaction fixes atmospheric nitrogen with oxygen to form NO. The reaction is: N2(g) + O2(g) = 2NO(g). If the equilibrium constant for this reaction at elevated temperatures is 5.60E-11, then what is the partial pressure of NO ...
Wednesday, February 25, 2015 by danny

Chemistry
The statement "matter can be neither created nor destroyed by chemical means, but it can be changed from one form to another" is the chemical law of A. definite proportions. B. atomic disintegration. C. conservation of energy. D. conservation of matter. im not sure ...
Wednesday, February 25, 2015 by Dave

CHEMISTRY
Someone please tell me if I'm doing this right... It's due tonight!! Dr. Bob222, Yesterday I posted a question and you answered me with how to calculate it.. Can you tell me if I'm doing this correctly?? Please! Consider the following chemical equation: TiCl4(g) + ...
Wednesday, February 25, 2015 by Jennie

Chemistry
Dr. Bob222, Yesterday I posted a question and you answered me with how to calculate it.. Can you tell me if I'm doing this correctly?? Please! Consider the following chemical equation: TiCl4(g) + 2Mg(l) → Ti(s) + 2MgCl2(l) 3.54×107g of TiCl4(g) were reacted ...
Wednesday, February 25, 2015 by Jennie

chemistry
Why is it that hf has a boiling point of 19°c while h2o has a boiling point of 100°c?
Wednesday, February 25, 2015 by Alutta

Chemistry
Can someone help me with this question? This could help me with how to do another question, similar to this, for my homework. 1.Estimate the pH of (a) 0.15 M NAHSO3 (aq) (b) 0.050 M NaHSO3 (aq) Thank you!
Wednesday, February 25, 2015 by Anonymous

Chemistry
a 100 g sample of ice at -15 degrees celsius is heated until it is converted to water vapour at 120 degrees celsius what is the energy change?
Wednesday, February 25, 2015 by Amber

Organic Chemistry
Looking down C2-C3 of 2-methylpentane, is the first newman projection staggered or eclipsed?
Wednesday, February 25, 2015 by Maria

chemistry
How is the reaction quotient used to determine whether a system is at equilibrium? The reaction is at equilibrium when Q > Keq. At equilibrium, the reaction quotient is undefined. The reaction quotient must be satisfied for equilibrium to be achieved. The reaction is at ...
Wednesday, February 25, 2015 by danny

chemistry
Upon combustion, 4.30 grams sample of a compound containing only carbon, hydrogen, and oxygen produced 8.59 g of CO2 and 3.52g of H2o. what is empirical formula of the compound ?
Wednesday, February 25, 2015 by Ayesha

Chemistry
HCl is a gas at room temperature and does not conduct electricity. Yet when dissolved in water, the solution becomes an excellent conductor. Classify HCl as metallic, ionic, molecular or covalent network, and explain why HCl would conduct electricity in an aqueous solution.
Wednesday, February 25, 2015 by Morgan

chemistry
I ned these classified as metallic, ionic, molecular or covalent network and two reasons why. Aluminum Ascorbic acid Graphite Paraffin Palmitic acid Sodium chloride Sucrose Water
Wednesday, February 25, 2015 by Morgan

chemistry
Are acids like ascorbic acid and palmitic acid ionic, molecular, or covalent network compounds
Wednesday, February 25, 2015 by Morgan

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