Post a New Question | Current Questions | Chat With Live Tutors
Homework Help: Science: Chemistry
- Atoms
- Chemical Change
- Molecules & Compounds
Recent Homework Questions About Chemistry
Post a New Question | Current Questions
chemistry
How many isomers are there of the complex ion [CoCl2(en)(NH3)2]+
Chemistry
What volume of 0.130 M NaOH is needed to neutralize 4.00 g of benzoic acid?
Dr. Bob...Chemistry
you just answered a question for me, but the following are my answers to choose from. it was the 2nd question that I posted. about hydrocloric acid solution mixing with sodium bicarbonate. So, my answers to choose from are gas evolution, precipitation, acid-base neutralization...
Chemistry
what type of reaction occures when a hydrochloric acid solution is mixed with a sodium bicarbonate solution? I chose gas evolution, but am wondering if it is acid-base neutralization instead.
Chemistry
What gas is produced when hydrochloric acid is reacted with ammonium carbonate?
chemistry
use thermochemical equations shown below to determine enthalpy for the reaction: H2CO3-->H2O+CO2 1) H2CO3 --> H2CO + O2 H; 224 KJ 2)H2CO + O2 --> H2O + CO2 H; -100KJ I know this problem is one that you have to rewrite the equations to get the equation in the original ...
chemistry
use thermochemical equations shown below to determine enthalpy for the reaction: H2CO3-->H2O+CO2 1) H2CO3 --> H2CO + O2 H; 224 KJ 2)H2CO + O2 --> H2O + CO2 H; -100KJ I know this problem is one that you have to rewrite the equations to get the equation in the original ...
chemistry
Hydrogen peroxide decomposes according to the following thermochemical reaction H2O2 --> H2O +1/2 O2 ; H= -98.2 kJ calculate the change in enthalpy when 1.00 g of hydrogen peroxide decomposes.
chemistry
Determine mass of iron heated to 85.0 degrees C to add to 54.0 g of ice to produce water at 12.5 degrees C. The specific heat of iron is 0.045 J/g C.
Chemistry
determine the final temp when 45.8 g of aluminum at -5.2 degrees C is added to a mixture of 45.0 grams of ice at 0.00 degrees C and 2000.0 g of water at 95.0 degrees C.
organic chemistry
When benzyl chloride is treated with sodium iodide in acetone, it reacts much faster than 1-chlorobutane, even though both compounds are primary alkyl chlorides. Explain this rate difference.
chemistry
what is the solubility of potassium nitrate (KNO3) in 100.0g of water 80degrees celcius
chemistry
Alternative of sodium arsenate
Biochemistry
A reaction A<-->B starts with equal concentration of A and B. AT equilibrium, there is twice as much B as A. What was the value of change in Gibbs Free energy when the reaction originally started if the temperature was 300k?
biochemistry
when a reaction A<-->B starts, there is three times as much product as reactant. When it reaches equilibrium, there is twice as much product as reactant. Show how to calculate the standard change in gibbs free energy for this reaction. I did it but I'm not sure if I ...
Biochemistry
A reaction A<-->B starts with equal concentration of A and B. AT equilibrium, there is twice as much B as A. What was the value of change in Gibbs Free energy when the reaction originally started if the temperature was 300k?
chemistry
Given the thermochemical equation SO2(g) + ½ O2(g) ---> SO3 (g) DH = -99.1 kJ calculate the enthalpy change (DH) when 89.6 g of SO2 is converted to SO3. 1. 69.3 kJ 2. -111 kJ 3. -139 kJ 4. 139 kJ 5. -69.3 kJ help plz
chemistry
Calculate DHo for the oxidation of nitric oxide to nitrogen dioxide, 2 NO(g) + O2(g) --> 2 NO2(g), from the following data: DHof[NO(g)] = +90.25 kJ DHof[NO2(g)] = +33.18 kJ im confused...can someone help me.
chemistry
If 1.000 kcal of heat is added to 1.700 L of oxygen in a cylinder at constant pressure of 1.00 atm, the volume increases to 2.100 L. Calculate the total energy change for this process. Pay careful attention to units. Some plz help me :(
Chemistry
The densities of gases A, B, and C at STP are 1.25g/L, 2.87 g/L, and .714 g/L. Calculate the molar mass of each substance. Indentify each substance as ammonia, sulfur dioxide, chlorine, nitrogen, or methane.
AP Chemistry
what pressure would have to be applied to steam at 350.degress C to condense the steam to liquid water (Hvap=40.7kJ/mol)
chemistry
Does a double or triple bond effect the bond angle?
chemistry
Show a balanced equation for a diprotic acid reacting with a tribasic base. I have an example of a diprotic acid as H2SO4 and a triprotic base as H3PO4. can i use those? if so please help balance.
chemistry grade 12
Question: Balance the following reactions by the oxidation number method. a) I2 + HNO3 --> HIO3 + NO2 + H2O so i have N +5 to +4 net charge = -1 I 0 to +5 net charge = +5 i add coefficient where the oxidation number is changing. in this case I2 + 10HNO3 --> 2HIO3 + 10NO2...
chemistry
a resting person requires 14.5 L of O2 per hour to maintain metabolic activities. Such a person breathes in 0.50 L of air at approximately 20 degrees C with each breath. The inhaled air is 20.9%O2 while the exhaled air is 16.3% O2. (a) how many breaths per minute does a restin...
Chemistry
Please help me answer the question: What does it mean Write a net ionic equation for the reaction 2HCl + Ca(OH)2 -> CaCl2 + 2H20
Chemistry
What kind of reaction is the following equation? Ca + H20 -> Ca(OH)2 + H2 (g)
chemistry
What is th pH of a buffer solution made by dissolving 0.10 mol of formic acid, HCOOH, and 0.10 mol of sodium formate, HCOONa, in 1L of water? What is the molarity of a solution made by dissolving 3.4g of Ba(OH)2 in enough water to make 450mL of solution? Assume that Ba(OH)2 io...
Chemistry
Elemental calcium is produced by the electrolysis of molen CaCl2. What mass of calcium can be produced by this process if a current of 8500 A is applied for 39 h? Assume that the electrolytic cell is 65% efficient. I found the mass to equal 1.6 x10^5g Ca, and that is correct. ...
chemistry
for an ideal gas which pair of varibles are inversely proportional to each other if all factors remain constant?
MATH
The following scores on the midterm exam in Chemistry 102 were recorded: 93 81 59 69 82 73 61 77 95 84 88 71 86 97 63 72 89 80 60 98 91 62 78 83 76 81 94 66 83 96 Find the interquartile range (IQR). I FORGET HOW TO DO THIS
chemistry
suppose you heat a hydrate too quickly and some of it was lost as it spattered out of the container. Explain how this would affect the calculated percent of mass and the chmical formula
chemistry
A gas has a volume of 91 ml at a temperature of 91°C. This gas is kept at constant pressure but its temperature is reduced to 0.0°C. At this temperature the volume of the gas will be approximately
chemistry
this isnt helping, i am not understanding how to decide what to figure out first
chemistry
How many kilograms of water must be added to 75.5 grams of Calcium nitrate to form a 0.500 m solution?
chemistry
how many kg of h20 must be added to 75.5g of Ca(NO3)2 to form a 0.500 m solution?
chemistry
suppose i want to find out how many mL of 1.0M AgNO3 are needed to provide 169.9g of pure AgNO3. what is step one in solving this problem? How many mL of solution are needed?
Chemistry
Which of the following ions can be reduced from an aqueous solution? A)Ba2+ B)Al3+ C)Sn2+ D)Na+ Do I look for the higher volts? Thanks in advance.
Chemistry
Why is it that identical functional groups on different molecules dont have identical frquencies?
chemistry
What are the reduction potentials of lithium, sodium and potassium?
Chemistry
Why is it that identical functional groups on different molecules dont have identical frquencies? Why does the O- H frequency occur at a value higher than the C=bond?
AP Chemistry
A mineral crystallizes in a cubic closest packed array of oxygen ions with aluminum ions in some of the octahedral holes and magnesium ions in some of the tetrahedral holes. Deduce the formula of this mineral and predict the fraction of octahedral holes and tetrahedral holes t...
chemistry
If you are given a 0.32 g piece of sodium metal to react with water, how many moles of HCl would it take to neutralize the sodium hydroxide produced?
chemistry
how many grams of kno3 should be used to prepare 2.00 l of a 0.500m solution
chemistry
Is the protonated/acidic form of bromothymol blue more soluble in water or dichloromethane?
CHEMISTRY
TO WAT VOLUME SHOULD YOU DILUTE 130ML OF AN 8.40 M CUCL2 SOLUTION SO THAT 65.0ML OF THE DILUTED SOLUTION CONTAINS 5.9 G CUCL2?
chemistry
how many grams of kno3 should be used to prepare 2.00 l of a 0.500m solution
chemistry
how many grams of kno3 should be used to prepare 2.00 l of a 0.500m solution
chemistry
how many grams of kno3 should be used to prepare 2.00 l of a 0.500m solution
electrochemistry
I am soooo confused! I was given this PdCl4^2-(aq)+Cd(s)----Pd(s)+4Cl^-(aq)+Cd^2+ I am supposed to give the 1/2 reaction for The PdCl4^2- My teacher said you could figure out the charges on the atoms by, in PdCl4^2, taking the subscript and mult. by the superscript to g...
chemistry grade 12
Question: Balance the following reactions by the oxidation number method. a) I2 + HNO3 --> HIO3 + NO2 + H2O so i have N +5 to +4 net charge = -1 I 0 to +5 net charge = +5 i add coefficient where the oxidation number is changing. in this case I2 + 4HNO3 --> 2HIO3 + 4NO2 +...
chemistry grade 12
Question: Balance the following reactions by the oxidation number method. a) I2 + HNO3 --> HIO3 + NO2 + H2O b) MnO4- + H+ + Cl- --> Mn2+ + Cl2 + H2O I know how to give each atom oxidation number but after i don't know how to apply the method.
chemistry grade 12
Thanks DrBob222 for previous answers. Question: Balance the following reactions by the oxidation number method. a) I2 + HNO3 --> HIO3 + NO2 + H2O b) MnO4- + H+ + Cl- --> Mn2+ + Cl2 + H2O
chemistry
Bit confused about this question. especially a and b. Not really sure which values to use or how. Thanks! A solution is made by dissolving 1.71g of barium hydroxide, Ba(OH)2 (s), in distilled water and then adding more distilled water until the total volume of the solution is ...
Chemistry
What will be the pH of: (a)10.0cm3 of an aqueous solution of 0.001mol dm^-3 nitric aicd, HNO3 (aq)? (b)100cm3 of an aqueous solution of 0.001mol dm^-3 nitric aicd, HNO3 (aq)? (c)0.02mol dm^-3 of potassium hydroxide solution, KOH (aq)? For (a) I got 2, (b) 1 and (c) 12.31. I am...
chemistry
1.00 mole H2
chemistry grade 12
Canada is a major producer of aluminum by the electrolysis of bauxite. However, there are no bauxite mines in Canada, and all the ore must be imported. Explain why aluminum is produced in Canada. Be sure to cite your sources.
chemistry grade 12
Explain why the top of a commercial 1.5 V dry cell battery is always marked with a plus sign.
chemistry grade 12
Explain why, in redox reactions, the total increase in the oxidation numbers of the oxidized elements must equal the total decrease in the oxidation numbers of the reduced elements.
chemistry
If you are given a .26g piece of sodium metal to react compltetely with water, how many moles of HCl would it take to neutralize the sodium hydroxide produced?
Chemistry
What is the minimum wavelength of light that can promote an electron from the valence band to the conduction band in silicon?
AP Chemistry
When finding empirical formula of a compound, why do you have to convert the elements into moles, as opposed to using a mass:mass ratio?
Chemistry
Calculate S (measure of total entropy) for the following reaction at 25C and 1atm, and tell whether the entropy is increasing or decreasing. C3H8(g)+5O2(g)-> 3CO2(g)+4H2O(g) S of C3H8=64.5 cal/(mol*K) S of O2= 49 cal/(mol*K) S of CO2= 51.1 cal/(mol*K) S of H2O= 45.1 cal/(mo...
chemistry
a chunk of silver has a heat capacity of 42.8J/degrees celcius and a mass of 181g. calculate the specific heat of silver.
Chemistry
About twenty radioisotopes with ultra-long half-lives, from 82 million years (244- Plutonium) to 6 million billion years (50-Vanadium) are found in the earth’s crust, yet no radioisotopes with half-lives less than 70 million years (146- Samarium) are found. Why not? Use t...
chemistry
if i wanted to disolve 106 g of Na2CO3 in enough h20 to make 6.00 L of solution....what is the molarity of this solution?
Organic Chemistry
What is the structure of the magnesium salt that is created as a byproduct of the Grignard reaction: bromobenzene + mg = phenylmagnesium bromide phenylmagnesium bromide + benzophenone = triphenylmethanol
chemistry
if you disolve 2.00 mol KI in 1.00 L of water will you get a 2.00 M solution? explain please
chemistry
how are the absolute temperature and volume of a gas at constant pressure related?
chemistry
how are the volume and pressure of a gas at constant temperature related?
chemistry
what is the relationship between the area a force is applied to and the resulting pressure?
chemistry
How might the numbers and kinds of atoms to the left and right of the arrow ==> in the model reactions you performed support Dalton's theory?
chemistry
a reaction known to release 1.78 kilojoule of heat takes place in a calorimeter containing 0.100L of soln. the temperature rose by 3.65C. next, a small peice of caco3 was placed in same calorimeter and 0.100L of dilute Hcl was poured over it. the temperature of the calorimeter...
Chemistry Help!!!!
Calculate S (measure of total entropy) for the following reaction at 25C and 1atm, and tell whether the entropy is increasing or decreasing. C3H8(g)+5O2(g)-> 3CO2(g)+4H2O(g) S of C3H8=64.5 cal/(mol*K) S of O2= 49 cal/(mol*K) S of CO2= 51.1 cal/(mol*K) S of H2O= 45.1 cal/(mo...
chemistry
in one experient, a student placed 50.0ml of 1.00molar Hcl at 25.5celsius in a coffee-cup calorimeter. to this was added 50.0ml of 1.00molar NaoH solution also at 25.5celsius. the mixture was stirred, and the temperature quickly increase to a maximum of 32.2 celsius. what is t...
Chemistry
Using G (measure of free energy) to determine wether the reaction 4Fe(s)+3O2(g)-> 2Fe2O3(s) is spontaneous at 25C, given that H=.393kcal and S=-0.13 kcal/(mol*K). Is the reaction more or less spontaneous at 1000C assuming that H and S remain constant with temperature? G at ...
Chemistry
Calculate S (measure of total entropy) for the following reaction at 25C and 1atm, and tell whether the entropy is increasing or decreasing. C3H8(g)+5O2(g)-> 3CO2(g)+4H2O(g) S of C3H8=64.5 cal/(mol*K) S of O2= 49 cal/(mol*K) S of CO2= 51.1 cal/(mol*K) S of H2O= 45.1 cal/(mo...
Chemistry
Draw the Lewis structure for SiCl2Br2.
college-chemistry
2. A 0.1967 g sample of pure ascorbic acid is weighed out and dissolved in 50.0 mL of distilled water in an Erlenmeyer flask. One week later, when about one third of the water in the flask has evaporated, this solution is titrated against 0.01735 M KIO3 solution and requires 1...
Chemistry
Elemental calcium is produced by the electrolysis of molen CaCl2. What mass of calcium can be produced by this process if a current of 8500 A is applied for 39 h? Assume that the electrolytic cell is 65% efficient. I found the mass to equal 1.6 x10^5g Ca, and that is correct. ...
chemistry
The question asks, "Butanoic acid has a partition coeff of 3.0 when distributed b/t water and benzene. Find the formal concentration of butanoic acid in each phase when 100 mL of 0.10 M aqueous butanoic acid is extracted with 25 mL of benzene at pH 10.00." I know tha...
chemistry
The reaction between 0.0272 g of Mg with an excess of water was carried out in an ice calorimeter. The volume of water decreased by 0.19 mL during the reaction. a) Write the equation that occurs. Is it a redox? b) Calculate the enthalpy of reaction? i have no clue how to appro...
AP Chemistry
A sample of potassium nitrate (49g) is dissolved in 101g of water at 100°C, with precautions taken to avoid evaporation of any water. The solution is cooled to 30°C and no precipitate is observed. The solution is ________. A. Hydrated B. Supersaturated C. Unsaturated D...
chemistry
The question asks, "Butanoic acid has a partition coeff of 3.0 when distributed b/t water and benzene. Find the formal concentration of butanoic acid in each phase when 100 mL of 0.10 M aqueous butanoic acid is extracted with 25 mL of benzene at pH 10.00." I know tha...
Chemistry
7.77 g of rush (an oxide of iron) is heated until all the O2 atoms combine with charcoal. When this is done, a pellet of pure iron with a mass of 5.44 g remains. What is the empirical forumla for rust?
electrochemistry
If I have 2- 1/2 reactions that are- O2(g)+4H(aq)+4e- -------2H2O and CyFe3+(aq) +e---------CyFe2+(aq) How do I determine the # of electrons transfered? In addition, if the electrons are on different sides of the equations how would I then determine the # being transfered? Tha...
AP Physics B (chemistry bit)
I think I'm doing this wrong In an internal combustion engine, air at atmospheric pressure and a temperature of about 20 degrees celcius is compressed in the cylinder by a piston to 1/9 of its original volume (compression ratio = 9.0). Estimate the temperature of the compr...
chemistry
how many grams of ethylene would have to be burned to produce 450 kJ of heat?
Chemistry-Bonding2 :-)
Chlorine, Cl2, is a gas at room temperature, but bromine, Br2, is a liquid. Why? Chlorine would create a nonpolar covalent bond as each atom (with equal electronegativity) shared it's non paired electron. Nonpolar molecules have a very weak attraction to other nonpolar mol...
Chemistry-Bonding
Is a water molecule more attracted to another water molecule or to a sodium ion? Explain. I would say that the water molecule is more attracted to a sodium ion since it is a dipole and and it would attract sodium's single electron in its valence shell. Is this right? Would...
Chemistry
Which of the following has the greatest entropy? A.1 mole NaCl (g) at 25C B.1 mole NaCl (g) at 50C C.1 mole NaCl (l) at 50C D.1 mole NaCl (s) at 100C I know that gases have the highest entropy and the higher the temperature the higher the entropy...so i am leaning toward b. bu...
Chemistry
an exothermic reaction involves a. breaking weak bonds to form weak bonds. b. breaking weaker bonds to form stronger bonds c. breaking srtong bonds to form strong bonds. d. breaking stronger bonds to form weaker bonds. I think that it is a.
Chemistry
True and False... 1. A thermodynamically favorable reaction also proceeds spontaneously. I think that it is false? 2. Doubling the concentration of a reactant always causes the reaction rate to double. 3. a reaction that has a large activation energy in the forward direction d...
chemistry
8.00g of NaOH are dissolved in water to make 3.00 L of solution. What is the concentration of hydronium ions, , in this solution?
chemistry
8.00 g of are dissolved in water to make 3.00 l of solution. What is the concentration of hydronium ions, , in this solution?
chemistry.
How many grams of sodium chloride are there in 55.00 Ml of a 1.90 M aqueous solution of sodium chloride? any idea. 2. What is the concentration of chloride ions in a 0.193 M solution of potassium chloride?..heeeeeeeeeeeelp.
chemistry.
How many grams of H3PO4 are in 175 Ml of a 3.5 M solution of H3PO4?
chemistry
1) Rank the elements, aluminum, sodium and phosphorus, in order of decreasing conductivity. 2) Rank the elements aluminum, gallium, and boron in order of decreasing conductivity
chemistry
What factors affect the rate of diffusion of one gas through another
chemistry
How do gases compare with liquids and solids in terms of the distance between their particles
chemistry
What is the relationship between the temperature, speed, and kinetic energy of gas molecules
Chemistry
I don't really get the question that my teacher told us to do for her class. The essay says to write a one page paper about a topic concerning electronic structure. I don't know what to do, and what to start writing about?
Chemistry
If one gross of golf tees weighs 118.80 grams, and a pack of golf tees weighs 412.50 g, how many golf tees are in the pack? I know that the answer is 500 golf tees, but I don't understand how this answer was achieved. Please help me understand what I'm supposed to do i...
Chemistry
Under the correct conditions, the element molybdenum emits X-rays with a characteristic wavelength of 0.711A (7.11*10^-11m). These X-rays are used in diffraction experiments to determine molecular structures. How fast does an electron need to be moving to have the same wavelen...
Chemistry
In which orbital does an electron in a phosphorus atom experience the greatest effective nuclear charge? a. 1s b. 2s c. 2p d. 3s e. 3p I originally thought 3p, since those are the outer electrons, but that was marked wrong. Why is it not 3p? Is the right answer 3s then?
Chemistry
A tin atom has 50 electrons. Electrons in which sublevel of this atom would experience the lowest effective nuclear charge? a. 1s b. 3p c. 3d d. 4s 3. 5p
Chemistry
In an atom, an electron in which of these sublevels can absorb a photon of energy but cannot emit one? a. 3s b. 2s c. 3p d. 1s e. 3f Would it be 1s? I don't really understand, if someone could explain this to me I'd appreciate it
Chemistry
The rate constant, k, for each reaction order is equal to _____ from the linear plot. Reaction Order Answer zero ______ first ______ second ______ a. slope (m) b. y-intercept c. x-intercept d. negative of the slope (-m) e. 0 i think zero order is maybe d? not sure
chemistry.
What is the concentration (M) of a NaCL solution prepared by dissolving 9,3g of Nacl in sufficient water give 350ml of solution?.Any idea???
Chemistry
A 100.0 mL of 0.200 M methylamine, CH3NH2, is titrated with 0.100 M HCl. Calculate the pH after 70.0 mL of 0.100 M HCl has been added.
Chemistry
Need help with this lab: (sorry so long) Hypothesis: The amount of product will be regulated by the limiting reactant. Procedure: First, I took two test tubes from the Glassware shelf. I added 6 mL of the copper sulfate solution to one, and 6 mL of the sodium sulfide solution ...
Organic Chemistry
1. What is Dipole Repulsions? 2. How does transannular strain affect large cycloalkanes (more than 6 ring atoms)? 3. What is a 1,3-Diaxial interaction?
Chemistry
How can you determine which acid solutions (all at 0.10 M) has the highest concentration of anions?
Chemistry
How do we know what salt has the lowest molar solubility?
AP Chemistry
Iron has a density of 7.86 g/cm3 and crystallines in a body-centered cubic lattice. Show that only 68% of a body-centered lattice is actually occupied by atoms, and determine the atomic radius of iron.
AP Chemistry
You are given a small bar of an unknown metal X. You find the density of the metal to be 10.5g/cm3. An x-ray diffraction experiment measures the edge of the face-centered cubic unit cell as 4.09 A. (1A=10^-10m) Identify X.
Chemistry
Which test tube has largest amount precipitate? Why? (use terms such as limiting reactant and excess reactant to explain) Do I just name the test tube that weighs the most and I need help with the explanation. I did not list the actual chemicals just need general statement.
Chemistry-Polarity
I am having trouble understanding polarity. I think I understand what it is - when a chemical bond occurs and there is or is not a resulting charge on the molecule. And the book says that the amount of polarity is the difference in the electronegativity between the two atoms i...
chemistry
how to get benzoic acid from a mixture of benzoic acid and salt?
chemistry
how many grams of Sb2S3 will contain 4.80 moles of S
chemistry
what is the mass of one mole of carbon dioxide?
chemistry
Delta H is given and is-6186.0 Calculate the difference, deltaH-deltaE=delta(PV) for the combustion reaction of 1 mole of methyl octane. (Assume standard state conditions and 298 K for all reactants and products.)
Chemistry-Bonding
Classify the following bonds as ionic, covalent, or neither (O, atomic number 8; F, atomic number 9; Na, atomic number 11; Cl, atomic number 17; U, atomic number 92). a.) O with F _________ b.) Ca with Cl __________ c.) Na with Na _________ d.) U with Cl __________ First, I do...
chemistry
For the following reaction at a certain temperature, it is found that the equilibrium concentrations in a 5.00 L rigid container are [H2] = 0.0500 M, [F2] = 0.0100 M, and [HF] = 0.400 M. If 0.261 mol of F2 is added to this equilibrium mixture, calculate the concentrations of a...
Chemistry
Calculate the average disappearance of A between t=0 min and t=10 min in units of M/s. 0 min there are .065 moles of A 10 min there are .051 moles of A 20 min there are .042 moles of A 30 min there are .036 moles of A 40 min there are .031 moles of A The total volume is 100.0 ...
science(chemistry)
Using condensed electron configurations and Lewis electron-dot symbols to depict the monatomic ions formed from each of the following reactants, predict the formula of the compound the ions produce. 1) K and P
chemistry
How many photons will be required to raise the temperature of 2.0 g of water by 2.5 K?
chemistry
in the lab of reaction with copper copper is suppose to loose mass because it oxidates. its that right or does it gain mass thanks
chemistry
when heated in the presence of air, 80 grms. of copper completely react to form 100 grms. of copper oxide what is the mass of oxygen that has combined with the copper? how much copper must be heated to form 300 grms. of copper oxide?
chemistry
was hoping someone can help me check if these answers make sense for a silver copper alloy lab. 3. Why don’t you have to weigh the sodium chloride on a sensitive balance? This one I am not sure about, It is because an excess of NaCl is needed to make sure the solution pre...
AP Chemistry
What is the redox reaction of (i dont understand how to do this): MnO4-(aq) + H2O2(aq) -> Mn2+(aq) + O2(g)
Organic Chemistry
Is a carboxylic acid group electron donating or election withdrawing and then decide if such a group substituted onto an alkene would be a better candidate for cationic or anionic initiated polymerization?
Chemistry
Assuming the mass of 5% Acetic Acid is 1.0g/mL, what volume of acetic acid is required to neutralize 25.0mL of 0.10M NaOH?
college chemistry
A green leaf has a surface area of 2.40 cm^2. If solar radiation is 1120 W/m^2, how many photons strike the leaf every second? Assume three significant figures and an average wavelength of 504 nm for solar radiation.
AP Chemistry
Why is HCI added on a drop-by-drop basis to ensure complete precipitation of Group 1 chlorides initially, rather than just added all at once? HCI forms a mixture of AgCI, PbCI2, Hg2CI2
chemistry
Can someone show me a website that talks about spectrums of elements. Including why they're all different, like basic information of spectrums. The why, how, and what.
chemistry; Lab questions help=)
was hoping someone can help me check if these answers make sense for a silver copper alloy lab. 3. Why don’t you have to weigh the sodium chloride on a sensitive balance? This one I am not sure about, It is because an excess of NaCl is needed to make sure the solution pr...
Chemistry problem
What is the expected freezing point of a 3.50 m aqueous solution of BaCl2 (Kfp=1.86C/m)? What is the boiling point (Kbp=0.512C/m? & which is affected to the greater extent, the boiling point or the freezing point?
Chemistry
NaHCO3 + HCl -> NaCl+H2O+CO2 What is the normality of a sodium bi carbonate solution containing 5.08g NaHCO3 in 150 ml solution?
chemistry
Which of the following would have the lowest vapor pressure? A. 0.8 m C6H12O6 B. 0.10 m C6H12O6 C. 0.05 m C6H12O6 D. 0.15 m C6H12O6 I think it is D... is that correct? Which of the following would have the lowest boiling point? A. 0.8 m C6H12O6 B. 0.10 m C6H12O6 C. 0.05 m C6H1...
chemistry
When one mole of LiBr is dissolved in 1 kg of H2O, the concentration of the Br- is 1. 0.5 molal 2. 0.5 molar 3. 1.0 molal 4. 1.0 molar
Chemistry
Complete and balance the following equation? __P4O6+__H2O -> ___________
Chemistry
Name the following compound? FeCl3 x 6H2O
Chemistry
True or false? Hydrogen bonds between water molecules are comparable in strength to hydrogen-carbon covalent bonds?
Chemistry
If equal masses of Sodium and Strontium were reacted with excess hydrochloric acid, which experiment would produce a greater volume of hydrogen gas?
Chemistry
Suppose that in your experiment you conducted in lab you neglected to account for pressure due to water vapor in your collected sample of hydrogen gas. How, if at all, would this affect your final value of atomic weight of the metal?
AP Chemistry
What is the specific solubilities (in g/100 g H2O) in both cold and hot water for AgCI, PbCI2, and Hg2CI2?
orgenic chemistry
why is the reaction mixture(isopentyl acid, glacial acetic acid,concentrated ssulfuric acid) extracted with sodium bicarbonate?give an equation and explain its relevance
orgenic chemistry
why is the reaction mixture(isopentyl acid, glacial acetic acid,concentrated ssulfuric acid) extracted with sodium bicarbonate?give an equation and explain its relevance
Chemistry
What the density of 100 mL of HCL at 18 degree C?
Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>> Post a New Question | Current Questions
Homework Help: Science
For Further Reading
|
