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
College Chemistry
Are my calculations correct of i came up with 50.71g of CaH2 to the question, "How many grams of are needed to generate 54.5 of gas if the pressure of is 815 at 22?"
integrated physics and chemistry
what is the main ingredient in 22-karet gold? is it copper,tin,gold,or steel?
integrated physics and chemistry
classes of steel and iron are defined by the amount of WHAT? and other elements present in the alloy. is it zinc,tin,carbon,or aluminum?
Chemistry (lab)
What are the units of retention time in gas liquid chromatography? Minutes or seconds?
Chemistry
A compound containing 3 atoms of carbon and 8 atoms of hydrogen is combined in a reaction with oxygen molecules. The two end products of this equation are carbon dioxide and water. What element should you look at first in balancing this equation? A. oxygen B. Hydrogen C. Carbo...
Chemistry
Which of the following elements does not form bonds easily because it has a full outer shell? A. Aluminum B. Carbon C. Helium D. Calcium
chemistry
Could someone explain dipole-dipole forces for me?
Chemistry
Gas particles travel at speeds of up to 500 m/s. Why, then, does it take so long for gas molecules to travel the length of a room? My answer would be that the molecules still have a weak attraction to each other and, in addition, the friction of the molecules surrounding the g...
Chemistry
How will the volume of a fixed sample of gas change if its pressure is doubled and the Kelvin temperature is doubled? a)the change cannot be determined without more specific information b)it will decrease by a factor of 2 c)it will increase by a factor of 4 d)no change e)it wi...
chemistry
How do you figure out the molecular weight?
Chemistry
Consider a sample of helium and a sample of neon, both at 30ºC and 1.5atm. Both samples have a volume of 5.0 liters. Which statement concerning these samples is not true? a- each weighs the same amount b- each has the same # of atoms of gas c- the density of the neon is g...
Chemistry
Consider a sample of helium and a sample of neon, both at 30ºC and 1.5atm. Both samples have a volume of 5.0 liters. Which statement concerning these samples is not true? a- each weighs the same amount b- each has the same # of atoms of gas c- the density of the neon is g...
chemistry
How will the volume of a fixed sample of gas change if its pressure is doubled and the Kelvin temperature is doubled? a)the change cannot be determined without more specific information b)it will decrease by a factor of 2 c)it will increase by a factor of 4 d)no change e)it wi...
chemistry
A process which is unfavorable with respect to enthalpy, but favorable with respect to entrophy a)could occur at high temperatures, but not at lower temperatures b)could not occur regardless of temperature c)could occur at any temperature d)could occur at low temperatures, but...
chemistry
What mass of solid aluminum hydroxide can be produced when 50.0 mL of 0.200M Al(No3)3 is added to 200 Ml of a 0.100M KoH
chemistry
What mass of solid aluminum hydroxide can be produced when 50.0 mL of 0.200M Al(No3)3 is added to 200 Ml of a 0.100M KoH
chemistry
How many mililmeters(mL) are in a sample with 2.0L?
Chemistry
Predict the product(s) and write a balanced equation for the following redox reaction: pentane (C5H12) + oxygen ---->
Chemistry
A 500.0-mL sodium iodide (NaI) solution was prepared by dissolving 37.7g of solid NaI in water. Chlorine gas was bubbled through a 100.0-mL sample of this solution until the reaction was complete. How many grams of molecular iodine were produced?
chemistry help!
A mixture contained CaCO3 and MgCo3. A sample of this mixture weighing 7.85g was reacted with excess HCl. The reactions are-- CaCO3 + 2HCl --> CaCl2 + H2O + CO2 MgCO3 + 2HCl --> MgCl2 + H2O + CO2 Is the sample reacted completely and produced 1.94L of CO2, at 25 degrees C...
chemistry
How do it geth the equation for 50.0 grams of iron(II)carbonate react completely with hydrochloric acid how many grams of carbon dioxide gas may be produced?
Chemistry
Identify any incorrect formulas. explain your answer. a. Mg2(SO4)3 b. Rb3As c. BeCl3 d. NaF
Honors Chemistry
Can someone check my first answer and help me with the second question? Thanks so much!! :D 1. N2 + 3H2 ==> 2NH3 : How many grams of NH3 can be produced from the reaction of 28 g of N2 and 25 g of H2? ==> I got 37.5 grams. 2. How much of the excess reagent in Problem 1 i...
Chemistry Equations
What's the equation for the formation of NO2(g) from its elements in its standard states? What's the equation for the formation of BF3(g) from its elements in its standard states? What's the equation for the formation of C2H5OH(l) from its elements in its standard ...
chemistry
Hii i was wondering if u cud help me solve this problem..im not sure how to start it. Calculate the delta H for the reaction of solid potassium with liquid water. If a 5.00 g piece of potassium is added to 1.00 kg of water at 24 degrees celsius what is the final temperature of...
chemistry
Arrrg!!! i dont understand how you figure out when balancing equations how many moles of something are needed to make it balanced
chemistry
in a blast furnace, Iron(III) oxide is used to produce iron by the following unbalanced reaction....Fe2O3(s) + CO(g)-->Fe(s)+ CO2(g) if 4.00 kg Fe2O3 are available to react how many moles of CO are needed? how many moles of each product are formed? help please how do i bala...
chemistry.
2.02g of KNO3 ( Mz=101) is dissolved in sufficient water to prepare 0,500 dm3 of solution. What is the concentration of this solution in mol dm?
chemistry.
Which solution contains 0,1 mol of sodium hydroxide? A- 1 cm3 of 0,1 mol dm3 NaOH B 10 cm3 of 0,1 mol dm3 NaOH C 100 cm3################### d 100 cm3 ###################
chemistry
Hello, ((((((I need the answer in a hour from my posting))))) I have been posting this problme for four days ago, so please show Sympathy. I solved it but I want to be 100% su ...there is moreshow problem Hello, ((((((I need the answer in a hour from my posting))))) I have bee...
chemistry-atom
why does splitting a nucleus create a tremendous amount of energy?
Honors Chemistry (stoichiometry)
Can someone check and make sure I'm doing these problems right? Thanks so much!! 1. N2 + 3H2 ==> 2NH3 : How many moles of hydrogen are needed to completely react with two moles of nitrogen? ==> I got 6 moles. 3. Zn + 2HCl ==> ZnCl2 + H2 : How many moles of hydroge...
chemistry
who said that each element was composed of extremely small particles democritus lavoisier proust dalton
chemistry
You have 5 metals A, B, C, D, E in 1.00M solutions of A^(3+), B^(3+), C^(3+), D^(3+), and E^(3+) respectively. When some of the half-cells are connected, the following results are found. Cathode /Anode /Cell Voltage C E 0.10V D B 0.08V A C 1.41V D C 0.55V Arrange the ions in d...
Chemistry: Electron Configurations
Write the electron configuration for the following ion. V3+ I got 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2. In simplified form, I got [Ar]4s^2. I checked my answer against the answer given in the back of my chemistry textbook, and the two didn't correspond. The answer my book gives i...
chemistry
after taken a shower you noticed small droplets of water on the mirror explain how ths happent i really ned help with this question plz help
Chemistry
How do i use energy coupling to work out how many molecules of ATP dG =-55 kJ/mol needed to make a peptide bond dG = +25 kJ/mol i dont really understand how to go about this do i need atp to activate the amino acids how can i calculate this??
chemistry
How many moles of NaOH are there in 1 drop (0.050 mL) of 0.10 M NaOH?
science
Select the choices in which work is done by recording "yes" or "no": 1. Reese completing her chemistry homework. NO? 2. the movers carrying Catalina's amplifier from the moving truck to her house. NO? 3. Li pushing his motorcycle down his driveway. YES?...
chemistry
how to measure the volume of wood chips? (will they float on water re: water displacement, so this would not be a good method to do it)
chemistry
What is the hamiltonian for a Lithium atom?
chemistry
what mass of NaOH would be dissolved in 1dm3 of water to obtain 0.5 moles of the NaOH solution
chemistry
which of the following gasses will have the largest volume ( all volumes are measured at the same temperature and pressure) A) 16g of CH4 B) 34g of NH3 C) 44g of co2 D) 64g of SO2 i think the answer is C am i right
Chemistry
Another ionic and net ionic equation that i am having trouble with!!! I need the ionic and net ionic equation KOH+ HBr -> KBr+ H2O
Chemistry
What is the ionic and net ionic equation? Ca(HO)2(aq)+ Na2CO3(aq)-> CaCO3 -> (s)+ 2NaOH (aq) I dont understand why there are two arrows? This is what i have so far... Ca+2OH+Na2(aq)+CO3(aq)...
Chemistry
When combining Ca(OH)2 with Na2CO3 it entraps SO2 out of a gas stream from kiln emissions where ore is processed into nodules. When there is not enough Na2CO3 in this combination, will it not allow the solids to form out and settle?
Chemistry
What is the ionic and net ionic equation for Na2CO3 + 2 HNO3 -> 2 NaNO3 + H2O + CO2 (g) This is what i have so far... Na2(aq)+CO3+H+NO3 -> Na+ NO3+ H2O(l)+CO2(g)... i don't know what to do!!!
Chemistry
CaCl2(aq)+ Cs3PO4(aq) ---> Complete the reaction and classify as precipitation or acid/base. Net ionic equation as well. I believe this is a precipitation reaction since there is no H. Believe the products may be CaPO4 and Cs3Cl2? Can someone help explain this to me, having...
chemistry
Calculate the angle which the spin angular momentum of a single electron forms with the z axis in alpha and beta spin states. What are the possible angles of the spin angular momentum for a two-electron triplet state
chemistry
What is the density (in g/L) of hydrogen gas at 23.0 degrees Celsius and a pressure of 1670 psi?
Chemistry
What is the molecular equation for the reaction between sodium (Na) and hydrochloric acid (HCl)?
chemistry
4.0 gram of ferrous ammonium sulphate, FeSO4*(NH4)2SO4 * 6H2O, is used. Since the oxalate is in excess , Calculate the theoretical yield of the iron complex
Chemistry
How many moles of ions are released when these samples are dissolved in water? a. 0.37 mol of NH4Cl b. 3.55 * 10^18 formula units of Ba(OH)2 * 8H2O I need to know what steps to take to get to the answer. Thanks!
Chemistry
Rank in order of decreasing average molecular speed at 21 degrees celsius: Ne, HBr, SO2, NF3, CO
Chemistry
1. Calculate the number of molecules in a deep breath of air whose volume is 2.15 L at body temperature, 36 degrees Celsius, and a pressure of 740 torr. 2.A fixed quantity of gas at 24 degrees Celsius exhibits a pressure of 740 torr and occupies a volume of 4.42 L. a)Use Boyle...
chemistry
Q1) 5 liters of Butane gas (C4H10) is reacted with plenty of oxygen at 27 oC and 1 atm to produce carbon dioxide and water vapor. Calculate the following: 1- The volume of CO2 produced at 1 atm and 400 oC. 2- The mass of H2O vapor produced. 3- The mol % of the products. Given:...
chemistry, science
Carbon is also removed from the atmosphere during the process of weathering. carbon dioxide combines with water to form carbonic acid. this reacts with calcium silicate (in rocks) to produce calcium ions, bicarbonate ions and silicon dioxide (silica) the chemical equation for ...
Chemistry
A 3.26g sample of metallic sodium is added to 200mL of water. How many moles of NaOH are produced?
Chemistry
Complete the following acid-base reaction with balanced molecular, total ionic and net ionic equations: calcium hydroxide (aq) + acetic acid (aq) ----> ? I know that calcium hydroxide is ca(OH)2 and that acetic acid is CH3COOH. I also know that one of the products in an aci...
organic chemistry
compare and contrast the reactivity of the organometallic reagents R2Cd, RLi, R2CuLi, RMgBr, RZnBr with respect to ethyl chloride, ethanoic acid and 2-cyclohexen-1-one im not really sure what its asking and i dont know how they react differently determines their reactivity ple...
chemistry
4. Give two reasons why graphite (carbon) electrodes are used in electrolysis. 5. You have 2 compounds called X and Y. X melts at 1200 degrees C and is soluble in water. Y melts at 156 degrees C and is insoluble in water. Draw 2 diagrams to show how you could prove which of th...
Chemistry
Dr.Bob222, I've been attempting the problem I posted previously about the ferrous ammonium sulphate, but I'm having no luck. I'm having trouble with my balanced equation. Do you mind showing me how to do the balanced equation? Thank you
Chemistry
compare and contrast the reactivity of the organometallic reagents R2Cd, RLi, R2CuLi, RMgBr, RZnBr with respect to ethyl chloride, ethanoic acid and 2-cyclohexen-1-one im not really sure what its asking and i dont know how they react differently determines their reactivity ple...
Chemistry
-CORRECTION- N2 + O2 --> 2 NO change in heat (delta H)= 43.2 kcal based on the reaction, which statement is true? a) 43.2 kcal are consumed when 1.00g of O2 reacts b) 43.2 kcal are consumed when 1.00g of N2 reacts c) 43.2 kcal are consumed when 1.00g of NO is produced d) 43...
Biochemistry
Hello guys, I just wanted some clarification of these question. 1. A sequence of amino acids in a certain protein is found to be -Ser-Pro-Gly-Gly-. The sequence is most probably part of a 1. a-helix 2.b-turn (b-bend) 3. parallel b-pleated sheet 4. a-sheet. 2. The pathological ...
Chemistry
4.0 g of ferrous ammonium sulphate, FeS04(NH4)2 SO4 6H20, is used. The oxalate is in excess, calculate the theoretical yield of the iron complex. Can someone please show me how to calculate a question like this please? Thank you
chemistry
N2 + O2 --> 2 NO change in heat (delta H)= 43.2 kcal based on the reaction, which statement is true? a) 43.2 kcal are consumed when 1.00g of O2 reacts b) 43.2 kcal are consumed when 1.00g of N2 reacts c) 43.2 kcal are consumed when 1.00g of NO is produced d) 43.2 kcal are c...
chemistry
sorry i forgot some of the units in the initial posting 8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, , in this solution?
chemistry
8.00g of NaOH are dissolved in water to make 4.00 of solution. What is the concentration of hydronium ions, , in this solution?
chemistry please help
how do you know if a hydrolytic work up is required for reactions with grignard reagents? What does hydrolytic work up mean is it treatment with aqueous acid
chemistry
The Measured voltage of the cell Pt H2 (1.0atm) H+ // Ag+ (1.0M) Ag ia 1.02 V at 25degrees. Gven E cell is 0.80V, calculate the pH of the solution.
chemistry
what turns pink when phenolphylathen is added to it?
chemistry
8.00 of are dissolved in water to make 4.00 of solution. What is the concentration of hydronium ions, , in this solution?
Chemistry
which metal does not require having its charge specified in the names of ionic comppounds it forms? a. Au b. Ca c. Cu d. Cr e. Fe
Chemistry
The ion formed by IODINE has electron configuration that resembles a. Te b. Kr c. Xe d. Br e. we cant know unless told whether it gains or loses electrons
Chemistry
Which of the following is most likely to LOSE electrons when forming an ion? a. F b. P c. S d. Rh e. Se
Chemistry
Dimethylsulfoxide (C2H6SO), also known as DMSO. How many moles of carbon are in 4 moles of DMSO? a 1 b 2 c 4 d 8 e not enough info
Chemistry
How many molecules of carbon dioxide (CO2) are there in 88g of carbon dioxide? a. 1 b. 2 c. 88 d. 1.2 x 10 24 e. not enough info
Chemistry
there are ___ molecules of methane (CH4) in 0.123 moles of methane? a. 16 b. 0.773 c. 2.46 x 10 -2 d. 7.40 x 10 22 e. 6.02 x 10 23
Chemistry
Once it is balanced, in the following chemical reaction NaHCO3(s) Na2O(g) + CO2(g) + H2O(l), what is the coefficient for Na2O (s)? a. 1 b. 2 c. 3 d. 4
Chemistry
the formaula for the compound formed between aluminum ions and phosphate ions is??? a. Al3(PO4)3 b. AlPO4 c. Al(PO4)3 d. Al2(PO4)3 e. AlP
Chemistry
In the compound PtCl2(NH3)2, what is the percentage of the mass due to nitrogen?
Chemistry
I am trying to show that the combined weight of the reactants is equal to the combined weight of the reaction. When I placed CaCl2 into Na2 CO3 I didn't lose any weight. When I added Sulfuric Acid, I could not recork due to safety, therefore I lost Carbon Dioxide which red...
Chemistry
Which is the smallest particle among the particles below? a. cesium atom b. cesium ion c. oxygen atom d. oxygen ion e. not enough information
Chemistry
Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S (s) + 3F2 (g) SF6 (g) What is the minimun number of moles of fluorine gas needed to completely react with 16 g sulfur? a. 1 b. 1.5 c. 2 d. 3 e. 6
Chemistry
a 22.5g sample of (NH4)2CO3 (ammonium carbonate) contains_____ moles of ammonium ions. A. o.468 b. 0.288 C. 0.234 d. 2.14 e. 3.47
Chemistry
How do I contain Carbon dioxide when I combine sulfuric acid, sodium carbonate and calcium chloride?
Chemistry
a sample of C3H8O that contains 200 molecules contain how many atoms?
Chemistry
What value of a measurement must be known if the accuracy of an experimental measurement is to be determined?
chemistry
One afternoon, a graduate student set up a silica gel column to chromatograph a mixture of two colourless products whose Rf values were quite close. Suddenly, he realized that he had tickets to the Leafs game that night. He turned the stopcock to stop collecting eluent, put a ...
Honors Chemistry
Absorbance spectroscopy relies on the fact that specific molecules can only absorb certain wavelengths. Explain how this could be used in a)microwaves and b) astronomical discoveries/interpretations. Thank you for any help with this... :)
Honors Chemistry
Help! I do not understand this question. What do you think the effect of concentration might be on the perceived level of a molecules absorbance?
Chemistry
Chlorine gas may be easily prepared in the lab according to the reaction: 2KMnO4(s)+ 16HCl(aq)-> 2 MnCl2(aq)+5Cl2(g)+ 8H2O(l)+ 2KCl(aq) What mass of HCl is needed to prepare 1 mole of Cl2 gas?
Chemistry
Some drain cleaners contain a mixture of sodium hydroxide and aluminum which reacts with water as follows: 2Al(s)+2 NaOH(aq)+6H2O(l)->2Na[Al(OH)4](aq)+3H2(g) What mass of hydrogen gas can be produced when 5g Al reacts with sufficient NaOH and H2O) according to the ab...
chemistry
what mass of water is needed to completely react with 2.35g of Ca
Chemistry
Can someone please check this for me? C4H8+5O2-->3CO2+4H2O+C Butane is a gas and .01 g of it is burned. Is .00218 g of carbon the result? Thanks
chemistry
In which anion do you expect a shorter O-O distance? BaO2 or KO2
chemistry
A sample of argon at 300.°C and 50.0 atm pressure is cooled in the same container to a temperature of 0.°C. What is the new pressure?
Chemistry
When we breathe we inhale oxygen, O2, and exhale carbon dioxide, CO2, plus water vapor, H2O. Which likely has more mass, the air that we inhale or the same volume of air we exhale? Does breathing cause you to lose or gain weight? I thought that the air we breathe out has more ...
Chemistry
1.91x10^4 (or 19100) J is how many in Cal? I've tried these answers and they are all wrong: 4561.9 4.56x10^3 4562.0 4565 4569.4 4.57x10^3
Thermochemistry
Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial speed of 4.5 m/s. As it travels, it loses some of its energy as heat. The ball slows down to 3.5 m/s and then collides straight-on with a second billiard ball of equal mass. The first billiard ball co...
Chemistry
A selenium atom (Se) would form its most stable ion by the 1. loss of 2 electrons. 2. gain of 1 electron. 3. loss of 1 electron. 4. loss of 7 electrons. 5. gain of 2 electrons. Help please and tell me how you got the answer. Thanks!
Chemistry
Convert the following into a balanced equation: Liquid disilicon hexachloride reacts with water to form solid silicon dioxide, hydrogen chloride gas, and hydrogen gas.
CHEMISTRY
if i perform this reaction with 25 grams of iron III phosphate and an excess of sodium sulfate, how many grams of iron III sulfate can i make
chemistry
1. The bombardier beetle uses an explosive discharge as a defensive measure. The chemical reaction involved is the oxidation of hydroquinone by hydrogen peroxide to produce quinine and water: C6H4(OH)2 (aq) + H2O2 (aq) �� C6H4O2 (aq) + 2 H2O (l) C...
chemistry
26 protons and 24 electrons. write the symbol of ions
chemistry
How would you find the empirical formula for this... a substance was found by analysis to contain 20% by mass calcium and 80% by mass bromine. Would it be CaBr2? This is what I did... 20g Ca * 20 mol Ca/801.56g Ca = .499 mol Ca 80g Br * 80 mol Br/6392.32g Br = 1.001 mol Br 1.0...
chemistry
How would you find the empirical formula for this... a substance was found by analysis to contain 20% by mass calcium and 80% by mass bromine. Would it be CaBr2? This is what I did... 50g Ca * 20 mol Ca/801.56g Ca = .499 mol Ca 80g Br * 80 mol Br/6392.32g Br = 1.001 mol Br 1.0...
chemistry
How would you find the empirical formula for this... a substance was found by analysis to contain 20% by mass calcium and 80% by mass bromine.
chemistry
A 2.000g sample of magnesium was burned in air to form an oxide. After the product was purified it was found to have a mass of 3.317g. What is the empirical formula for the product? I know how to find a empirical formula, I just don't understand what masses I am supposed t...
chemistry
If the KmnO4 of the last problem is in 30.30mL of solution what is the molarity (M) of the KMnO4 solution?
Chemistry
A particular metallic element, M, has a heat capacity of 0.36 J*g*K, and it forms an oxide that contains 2.90 grams of M per gram of oxygen. (a) Using the law of Dulong and Petit (Cp x M = 25 J*mol*K), estimate the molar mass of the metal M [Answer: _____ g/mol] (b) From the c...
Chemistry
Not every molecule with polar bonds is polar. Explain this statement. Use CCl©þ as an example.
Chemistry
Give the symbol for each, and the units: 1.What is the mean kintetic energy of all particles in a sample of matter? 2.What is the amount of thermal energy that flows between two or more bodies of different temperatures?
Chemistry
What are some different ways two water molecules could be positioned so that they stick together?
Chemistry
Hi Dr. Bob, this is a chemistry question. I don't know how to go about solving this problem: What is the pH of the solution created by combining 11.40 mL of the 0.10 M NaOH(aq)with 8.00 mL of the 0.10 M HC2H3O2(aq)? Here's what I have so far: (0.10M NaOH)(0.0114L)= 0.0...
chemistry
how many totsl moles of ions are released when 0.83 mol of K3PO4 dissolves in water?
chemistry
what are electrostatic forces
chemistry
Calculate the delta H for the reaction N2H4(l)+ O2(g) --> N2(g) + 2H20(l) Given the following data: 2NH3(g) + 3N20(g) --> 4N2(g) + 3H20(l) N20(g) + 3H2(g) --> N2H4(l) + H20(l) 2NH3(g) + 1/2O2(g) --> N2H4(l) + H20(l) H2(g) + 1/2O2(g) --> H20(l)
Biochemistry
explain why a strong acid or base can denature an enzyme explain how varying pH influenced the rate of the catalase reactions and explain why. explain the influence of temperature in excess of 50 degrees C on the influence of most enzyme controlled reactions. explain why this ...
Chemistry
Based on pressure values for each component of the reaction, what is the value of the reaction quotient, Q? Equation: C2H2 + 2 H2 -> C2H6 C2H2 has a pressure of 5.05 atm H2 has a pressure of 4.35 atm C2H6 has a pressure of 0.0225 atm
chemistry
What was Bohr's theory of behavior of the electron?
chemistry
problem 3. A compound Y containing carbon,hydrogen and oxygen was burned in a stream of oxygen,the carbondioxide and water were cooled in a pre way absorption tube and carefully reweighed.Readings obtained were initial mass of Y is 20.63mg mass of carbondioxide produced 57.94m...
chemistry
problem 2. a sample of calcium chloride weighs 1.64g. it is dissolved in water and silver nitrate solution added.a precipitate of silver chloride weighing 4.24g was formed.determine the percentage composition of each element. the simple formular of calcium chloride.
chemistry
what is the volume of 0.)250 MgCl2 should be diluted to 250 mL to obtain a solution with {Cl-} = 0.0135
chemistry
the percentages of carbon,hydrogen and oxygen in vitamin c were determined by burning a sample weighing 2.00mg,the masses of carbondioxide and water formed are 3.00mg and 0.81mg respectively.from these information,find the percentage of each element and the emperical formular ...
Chemistry
What type of chemical reation is : Na + H2O---) NaOH + H2? The 2s are subscripts but I couldn't get it to type that way.
chemistry
why mixture of Nano2 and NH4Cl are taken in aqueous form?
general chemistry
How many grams of Sulfur are there in 6.0 grams of Fe2(SO4)3
chemistry
what is meant by the term coefficient in relation to chemical equation
Chemistry II
A solution contains the following: NH3(aq) + H2O(l) <--> NH4+(aq) + OH-(aq) Adding NH4Cl to this solution shifts the equilibrium of the given reaction to the left. What kind of reaction is this?
chemistry
What four guidelines are useful in balancing an equation
chemistry
How are most decomposition reactions initiated
chemistry
Assume you are performing the calibration step of Experiment 8 and you begin with 80 g of water at 20 oC and 80 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the tem...
organic chemistry
What will happen to the Rf values of the pigments if you were to increase the relative concentration of acetone in the developing solvent
physical chemistry PLEASE HELP!!!
given E, = l^2 h^2 / 2 m r^2 calculate energies for an electron localised to a circle of radius 2 x 10^-9 m for l = 0,1,2, draw pictures of three levels and calculate the relative populations of these levels at 300K i did the first bit but came out with, 0, 6.0249 x 10-6 J mol...
chemistry
Predict the mass of gold formed when a gold (III) nitrate solution reacts completely with 125 mL of 0.352 mol/L sulfurous acid (aqueous hydrogen sulfite)
chemistry
what is the molar volume measured at stp of 16 grams of oxygen
chemistry
Give the symbol of the element of lowest atomic number whose ground state has: a) Four f electrons b) a completed d subshell c) six s electrons I dont understand ground state electrons at all? Could you explain them in addition to explaining the questions
chemistry
this is for a lab - determining the chemical formula of a hydrate. suppose the hydrate was heated too quickly and some of it was lost of spattered out of the container. explain how hthis would effect a) the calculated percent by mass of water in the compound b) the molecular f...
chemistry 101
Calculate (delta) H rxn for 2NOCl(g)---- N2(g) + O2(g) + Cl(g) given the following set of reactions: 1/2N2(g) + 1/2O2(g)-----NO(g) delta H =90.3kJ NO(g) + 1/2Cl2(g)----NOCl(g) delta H = -38.6 kJ
Chemistry
Based on pressure values for each component of the reaction, what is the value of the reaction quotient, Q? Equation: C2H2 + 2 H2 -> C2H6 C2H2 has a pressure of 5.05 atm H2 has a pressure of 4.35 atm C2H6 has a pressure of 0.0225 atm
chemistry
According to the Bohr model of the hydrogen atom, how is hydrogen's bright line spectrum produced?
Chemistry
What is the pH of a 1.00 L solution of the following buffer 0.500 M propanoic acid (HC3H5O2 Ka = 1.30 × 10^−5) / 0.800 M sodium propanoate after the addition of 0.700 mol solid NaOH. I tried using the Henderson-Hasselbach equation pH = pKa + log[A-/HA] I used it in...
Honors Chemistry
what happens when the change of energy is negative?.
chemistry
please assist me with this themochemistry question Given the following data CaCO3 (s)>>>>>>CaO (s) + CO2(g) (g) Delta H = -178.1 kj C (s) + O2>>>>>>CO2 (g) Delta H = -393.5 kj Calculate enthalpy in kj of the following reaction CaCO3 (s)>&...
chemistry
The dipole moment of HCl is 1.0 D, whuch represents a charge separation of about .17 of an electron charge. If the dipole moment of HBr is .8 D what fraction of a positive charge is found at H nucleus in HBr? Please explain
chemistry
calculate the mass of oxalic acid dihydrate C2H2O4.2H2O required to react with 30 ml of 0.20 M sodium hydroxide solution?
Bioanalytical Chemistry
Considering size-exclusion chromatography, ion-exchange chromatography, reversed-phase liquid chromatography, and capillary electrophoresis list the possible combinations (there are a total of 6) of techniques that could be coupled to give a 2-dimensional separation. a. which ...
Bioanalytical Chemistry
Two proteins are separated by capillary electrophoresis. The two proteins have the following physical characteristics: Protein A: net charge = +6; MW = 64,500; partial specific volume = 0.700 cm3 / g Protein B: net charge = +3; MW = 35,000; partial specific volume = 0.700 cm3 ...
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
|
