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August 25, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
A sample of nitrogen gas was collected via water displacement. Since the nitrogen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 21 °C is 1.16 atm, what is the partial pressure of nitrogen? The vapor ...
Wednesday, December 9, 2015 by Leanna

Chemistry
I have to list distributed benzene in order of polarity, and I don't think i know how to do that, but does polarity have to do with dipole moments?
Wednesday, December 9, 2015 by Dan

Chemistry
I just need someone to check over my answers, I'm pretty confident in all of them! In which six-membered hydrocarbon rings are all of the C-C-C angles roughly the same, i.e., within 1o? Select ALL that apply. Question 1 options: A)cyclohexane B)cyclohexene C)1,3-...
Wednesday, December 9, 2015 by Dan

chemistry
C2H6 <> C2H4 + H2. when 1.00mol ethane is cracked at 180kPa and 1000K, the yield of ethene is 0.36mol. Calculate the value Kp at 1000K...
Wednesday, December 9, 2015 by jay

Chemistry (Help)
I'm having trouble figuring out this one. Can you please help? I haven't gotten a response to any of my questions. Chemical formula: Na Name: Sodium Bond Type (intramolecular FOA): metallic bond VSEPR molecular shape: none Central Atom Hybridization: none? Molecular ...
Wednesday, December 9, 2015 by Kyle

Chemistry (Check)
Are these right? Chemical formula: NaCl Name: Sodium chloride Bond Type (intramolecular FOA): ionic bonding VSEPR molecular shape: none Central Atom Hybridization: sp3 Molecular Polarity: polar Interparticle force of attraction (IPFOA): London, dipole-dipole, ion-dipole State ...
Wednesday, December 9, 2015 by Kyle

Chemistry
Explain the trends in the solubility of water.
Wednesday, December 9, 2015 by Anonymous

Chemistry
Did u think about it?
Wednesday, December 9, 2015 by Scott

Chemistry
Draw the best Lewis structures for NO+, NO2-, NO2H, and NO3-. Based on the Lewis structures, list all of the the N-O bonds lengths in order of shortest (1) to longest (5). N-O bond length in >>> 2 N-O double bond in NO2H >>> 1 N-O bond length in NO3- >>...
Tuesday, December 8, 2015 by Dan

Chemistry. Half Life Problem. Help Plz
If the half-life of iodine-131 is 8 day, how much would remain undecayed after 8 day if we started with 38 grams? How much at 16 days? 24 days? 32 days?
Tuesday, December 8, 2015 by Dominick

Chemistry
The number of protons in a cation must always be ________ the number of electrons.
Tuesday, December 8, 2015 by Dominick

Chemistry. I got the wrong answer. Plz help
A sample of sodium reacts completely with 142 g of chlorine, forming 234 g of sodium chloride. What mass of sodium reacted? I took 142g of Cl / 35.5g/mol = 4 mols of Cl Then I took 58.44g/mol x 4 mols of Cl = 233.76 It asked for three significant figures only so I put 233 and ...
Tuesday, December 8, 2015 by Dominick

Chemistry. Plz Help!
A sample of sodium reacts completely with 142 g of chlorine, forming 234 g of sodium chloride. What mass of sodium reacted? Express your answer to three significant figures and include the appropriate units.
Tuesday, December 8, 2015 by Dominick

Chemistry. Plz Help!
When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 20.4 g of carbon were burned in the presence of 71.1 g of oxygen, 16.7 g of oxygen remained unreacted. What mass of carbon dioxide was produced? Express your answer to three significant figures ...
Tuesday, December 8, 2015 by Dominick

Chemistry
Sodium chloride dissolves in water (solubility in water is 361g/1L), but copper (II) phosphate does not dissolve in water (insoluble). A. Describe in a stepwise fashion how the solid sodium chloride dissolves in the water to form a solution. (name the resulting interparticle ...
Tuesday, December 8, 2015 by Anonymous

Chemistry
When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 20.4 g of carbon were burned in the presence of 71.1 g of oxygen, 16.7 g of oxygen remained unreacted. What mass of carbon dioxide was produced? Express your answer to three significant figures ...
Tuesday, December 8, 2015 by Dominick

Chemistry
A sample of sodium reacts completely with 142 g of chlorine, forming 234 g of sodium chloride. What mass of sodium reacted?
Tuesday, December 8, 2015 by Dominick

Chemistry
Chemical formula: NaCl Name: Sodium chloride Bond Type (intermolecular FOA): London, dipole-dipole, ion-dipole VSEPR molecular shape: none Central Atom Hybridization: sp3 Molecular Polarity: polar Interparticle force of attraction (IPFOA): ? State of Matter (at room ...
Tuesday, December 8, 2015 by Anonymous

Chemistry
Explain trends in the solubility of water (amount of the compound (solute) that will dissolve in a given amount of solvent (water).
Tuesday, December 8, 2015 by Anonymous

Chemistry Help
Which of the following exhibits the highest boiling point? HF, HCl, HBr, or HI Which of the following exhibits the highest boiling point? CH3CH3, CH3COOH, or CH3OCH3 How can you determine the highest boiling point of these?
Tuesday, December 8, 2015 by Kyle

Chemistry
Chemical formula: Na Name: Sodium Bond Type (intermolecular FOA): London VSEPR molecular shape: none Central Atom Hybridization: sp Molecular Polarity: nonpolar Interparticle force of attraction (IPFOA): ? State of Matter (at room temperature): solid Can't figure out the ...
Tuesday, December 8, 2015 by Anonymous

Chemistry
Which of the following exhibits the highest boiling point? Ne, Ar, Kr, or Xe My answer: Xe Which of the following exhibits the highest boiling point? F2, Cl2, Br2, or I2 My answer: HI Which of the following exhibits the highest boiling point? NaCl, SO2, or N2 My answer: SO2 ...
Tuesday, December 8, 2015 by Kyle

Chemistry
Can you please check if these are right? I'm not sure about IPFOA. Chemical formula: H2O Name: Dihydrogen oxide Bond Type (intermolecular FOA): London, dipole-dipole, hydrogen bonding VSEPR molecular shape: bent Central Atom Hybridization: sp3 Molecular Polarity: polar ...
Tuesday, December 8, 2015 by Anonymous

Chemistry
Is it true that the higher the boing point, the higher the vapor pressure?
Tuesday, December 8, 2015 by Sarah

Chemistry
How do you solve for enthalpy of vaporization? I know it's liquid to gas, but I can't figure out how to solve an actual problem like C2H4O2. Could you please explain?
Tuesday, December 8, 2015 by Anonymous

Chemistry
How much total work does a golf caddy do if he lifts a 300 N golf bag he is carrying 100 times a during a round, to a height of 1.0 m each time he lifts it?
Tuesday, December 8, 2015 by Kaitlyn

Chemistry
Rank the following in order of decreasing vapor pressure, and briefly explain the observed trend in vapor pressure: Acetic Acid Isobutane Acetamide Propanal
Tuesday, December 8, 2015 by Sarah

Chemistry
Hey can you please check my answers? Also, Can you explain interparticle force of attraction? I'm not sure about the difference between IMFOA and IPFOA. Chemical formula: Cl2 Name: Chlorine Bond Type (intermolecular FOA): London VSEPR molecular shape: tetrahedral Central ...
Tuesday, December 8, 2015 by Anonymous

Chemistry
Fe2O3 + Fe + H2SO4 → FeSO4 + H2O How would I balance this using oxidation numbers? Is the Fe2 being reduced and the Fe being oxidized?
Tuesday, December 8, 2015 by Luke

applied chemistry
Draw electron dot diagram for the following compound HCL,CO2,NH3,NH4CL,CH4 And H2O2
Tuesday, December 8, 2015 by francis

chemistry physics
Which following assertions are true ? - unanswered 13C NMR is more sensitive than 1H NMR because of the 1.1% natural abundance of 13C nuclei. 13C nuclei have a ½ spin and can be detected in NMR, opposite to more abundant 12C nuclei. 13C NMR requires a different ...
Tuesday, December 8, 2015 by Abd

Chemistry
Give two physical properties of ionic compounds? Thanks.
Tuesday, December 8, 2015 by Isha

Chemistry
Hey can you please check my answers? Also, Can you explain interparticle force of attraction? I'm not sure about the difference between IMFOA and IPFOA. Chemical formula: Cl2 Name: Chlorine Bond Type (intermolecular FOA): London VSEPR molecular shape: tetrahedral Central ...
Monday, December 7, 2015 by Anonymous

Chemistry
Would copper (II) phosphate be nonpolar?
Monday, December 7, 2015 by Sarah

Chemistry
Identify the predominant intermolecular force in each of these substances. 1. Hydrogen 2. Dipole-Dipole 3. London A)H20 B)NH3 C)CH3 C=O OCH3 D)CH4 E)CH OH-C-OH CH3 what I have so far is A) 1 B) 1 C) 2 D) 3 E) I'm not sure about E, I think it might be dispersion?
Monday, December 7, 2015 by Dan

Chemistry
Calculate the molecular weight of a gas if 16.8 g of the gas occupies 16.3 L at STP.
Monday, December 7, 2015 by Shawn

chemistry
How do you write the balanced chemical equation for the addition of aqueous potassium fluoride to aqueous copper(II) sulfate? please explain this as a step by step process.
Monday, December 7, 2015 by amellusrosa

Chemistry
An excited ozone molecule, O3*, in the atmosphere can undergo one of the following reactions, O3* → O3 (1) fluorescence O3* → O + O2 (2) decomposition O3* + M → O3 + M (3)deactivation, where M is an inert molecule, the rate constant for the fluorescence ...
Monday, December 7, 2015 by Anonymous

Chemistry
A mass of aluminium metal is heated in a such in a such a way that is was exposed to air.(1.751g Al) A compound containing aluminium and oxygen is formed. It has a mass of 3.311 g. What is the empirical formula of aluminum oxide according to this experimental data?
Monday, December 7, 2015 by Jessie

Chemistry
How many grams of O2 are released into the environment during the production of the 5.1 grams of glucose?
Monday, December 7, 2015 by Vinny

AP Chemistry
Calculate ΔHrxn for the following reaction: C(s)+H2O(g)→CO(g)+H2(g) Use the following reactions and given ΔH values: C(s)+O2(g)→CO2(g), ΔH= -393.5 kJ 2CO(g)+O2(g)→2CO2(g), ΔH= -566.0 kJ 2H2(g)+O2(g)→2H2O(g), ΔH= -483.6 kJ
Monday, December 7, 2015 by Q

chemistry
how many oxygen atoms are in 10 formula of Al2(SO4)3
Monday, December 7, 2015 by patricia

Chemistry
3. Choose the hybridization schemes for the following species. (a) AsBr6− sp sp2 sp3 sp3d sp3d2 (b) CSe2 sp sp2 sp3 sp3d sp3d2 (c) PbCl4 sp sp2 sp3 sp3d sp3d2 (d) SeO32− sp sp3 sp2 sp3d sp3d2 (e) BiF5 sp sp2 sp3 sp3d sp3d2
Monday, December 7, 2015 by S

Chemistry
2. Which of the following molecules is/are trigonal pyramidal? N2O NH3 C2H2 SiF4 HN3 HCN SO3 H2S CF4 PF3 H2O BF3 COS O3 SO2 CS2 AsH3
Monday, December 7, 2015 by S

Chemistry
1. [ PF4 ]+ (a) What is the electron-group geometry, according to VSEPR theory? (b) What is the molecular geometry? (c) Is this species polar or nonpolar?
Monday, December 7, 2015 by S

chemistry
Determine the final temperature of a 10 gram aluminum block originally at 25.0 degrees Celsius if you apply 435 J of energy to it.
Monday, December 7, 2015 by Jenifer

Chemistry
Compute the surface area of revolution about the x-axis over the interval. y = x^2, [0, 4] Is it (pi/12)(65^2 - 65)^(3/2)?
Monday, December 7, 2015 by Sanaya

Chemistry
Zn + 2HCl = ZnCl2 + H2 Which amount would produce more H2: 17gramsZn OR 150 mL of 0.5HCl?
Monday, December 7, 2015 by Ashley

CHEMISTRY
A quantity of N2 occupies a volume of 1.5 L at 300 K and 1.2 atm . The gas expands to a volume of 3.2 L as the result of a change in both temperature and pressure.
Monday, December 7, 2015 by Anonymous

Chemistry-Dr.Bob
What is the increasing dipole moment for CO,CS, and SiS? My answer: SiS<CO<CS Is this correct?
Monday, December 7, 2015 by Sanaya

chemistry
how many electrons are transfered in one atom of Mn in the reaction?MnO2+4HCl=MnCl2+2H2O+Cl2
Monday, December 7, 2015 by Natty

chemistry
A sample consist only NaCl and NaBr has amass of 0.7648gm. This sample is place in solution in which excess of silver is added which forma precipitate the AgCl and AgBr has amass of 1.5758 gm . what's the percentage of Cl and Br in original sample ?
Monday, December 7, 2015 by Nechirwan

Chemistry
How can you tell if a compound is polar or nonpolar? Is it just by lewis structures? what would copper (II) phosphate be?
Monday, December 7, 2015 by Sarah

chemistry
ΔH°rxn is -114.14 kJ/mol. Calculate ΔH°f of gaseous nitrogen monoxide, given that ΔH°f of NO2(g) is 33.90 kJ/mol.
Monday, December 7, 2015 by lee

Chemistry
When given different elements and asked for the highest boiling point, do you figure out the molar mass and pick the highest one as the highest boiling point?
Monday, December 7, 2015 by Sarah

Chemistry
A pot containing 500 g of water at 100 degrees Celsius would require how much energy to boil off completely
Monday, December 7, 2015 by Erika

chemistry
Calculate the molarity of a 6% solution of ammoniun nitrate of density 1.025 g/mL
Monday, December 7, 2015 by derek

Chemistry
Sodium chloride dissolves in water (solubility in water is 361g/1L), but copper (II) phosphate does not dissolve in water (insoluble). A. Describe in a stepwise fashion how the solid sodium chloride dissolves in the water to form a solution. (name the resulting interparticle ...
Sunday, December 6, 2015 by Anonymous

chemistry
a gas has a volume of 95 mL at a pressure of 930 torr. What volume will the gas occupy if the pressure is increased to 970 torr and the temperature remains constant
Sunday, December 6, 2015 by viridiana

Chemistry
34.09 ml of 0.251 M KOH is required to tritate a 10.2951 g sample of acetic acid solution. The density of the solution had been previously found to be 1.007g/ml. what is the molarity of the aetic acid solution?.
Sunday, December 6, 2015 by sandra

Chemistry
Can pi bonds be made from d-orbitals?
Sunday, December 6, 2015 by Sanaya

chemistry
How to solve this problem in counting atoms 2 pb(CN)2
Sunday, December 6, 2015 by bob

Chemistry
How many grams of cesium chloride (CsCl) will be needed to make 750. mL of a 0.100 M CsCl aqueous solution? The formula mass of CsCl is 168.36 g/mol. Remember Molarity: M = (mol solute) / (L of solution) I need help solving this problem
Sunday, December 6, 2015 by Mark

Chemistry
A compound that you are studying is soluble in CCl4 but not in water. Would you predict that the compound is polar or nonpolar? Why? [Please explain; don’t just give a trivial answer such as “Because like dissolves like”.]
Sunday, December 6, 2015 by Mark

Chemistry
150 g of water at 80 degree Celsius is cooled to 50 degree Celsius how much heat is lost bye the water
Sunday, December 6, 2015 by Kelly

Chemistry
Chart: Group, Bond length, Bond strength, H-X-H Bond Angle NH3: 1.000, 391, 107 PH3: 1.412, 322, 93.5 AsH3: 1.510, 247, 92 SbH3: 1.688, 247, 92 What physical states do these molecules exist at room temperature? Gas Briefly explain the observed trend in bond length. Briefly ...
Sunday, December 6, 2015 by Anonymous

Chemistry (Check)
Which of the following exhibits the highest boiling point? a. Ne, Ar, Kr, or Xe? Xe b. HF, HCl, HBr, or HI? HI c. CH3CH3, CH3COOH, or CH3OCH3? CH3COOH d. F2, Cl2, Br2, or I2? I2 e. NaCl, SO2, or N2? SO2 Are these right? I just went by molar mass. If these are wrong, please ...
Sunday, December 6, 2015 by Anonymous

chemistry
Consider the following equation: CO + 2 H2 → CH3OH △H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2
Sunday, December 6, 2015 by katia

chemistry
Consider the following reaction: 2 Mg + O2 → 2 MgO △H rxn = -1203 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 4 moles of Mg.
Sunday, December 6, 2015 by katia

Chemistry (Check and Help)
Hey can you please check my answers? Also, Can you explain interparticle force of attraction? I'm not sure about the difference between IMFOA and IPFOA. Chemical formula: Cl2 Name: Chlorine Bond Type (intermolecular FOA): London VSEPR molecular shape: tetrahedral Central ...
Sunday, December 6, 2015 by Anonymous

chemistry
Help me solve it. Step by step please The value of kp at 20°c for the reaction 2NO(g) +Cl2(g) 2NOCl(g) is 1.9x10^3 atm-1 calculate the value of KC at the same temperature.
Sunday, December 6, 2015 by john

chemistry
how many joules are needed to completely melt 25 grams of ice at 0 degree celcius?
Sunday, December 6, 2015 by b

chemistry
0.5g of an organic compound x (containing carbon hydrogen oxygen) produces 0.733g of carbondioxide and 0.3g of water on complete combustion.the max spectrum shows mr=60.determine molecular formula of x
Sunday, December 6, 2015 by ali

chemistry
What is the enthaphly change when 2 moles of fe(111)oxide is reduced by 3 moles of aluminium ♢Hf Al2O3= -1676kJ mol-1 ♢Hf (Fe2O3)= -825kJmol-1
Sunday, December 6, 2015 by yap97

chemistry
A pound of coffee beans yields 56 cups of coffee (4 cups= 1 qt.) how many milliliters of coffee can be derived from 2.2g of coffee beans?
Sunday, December 6, 2015 by tagiz

Chemistry
In a moist room (44m3) 4 kg dry CaCl2 is placed. The room contains 10 g/m3 of H20. How much of the CaCl2 is converted to CaCl2*2H2O? Temperature 10 deg C. Equilibrium constant is 10^5 atm-2 at 10 deg C. I've caclulated Kp to 0,0032 atm and then tried to convert to Kc to 1,...
Sunday, December 6, 2015 by Henrik

Chemistry
How many grams of 10% wt BaCl2 solution will be necessary to produce 5.6g BaCl2?
Sunday, December 6, 2015 by ange

Chemistry
Name the compound or give molecular formula. 1. Pt(NO2)2 : ? Is it Platinum (II) Nitrite 2. Manganese (II) bromide pentahydrate:? Is it MnBr2 • 5H2O
Sunday, December 6, 2015 by Sanaya

Chemistry
Calculate the frequency of light associated with the emission from n=5 to n=4 in the hydrogen atom. I got -7.41 x10^13 Hz, but the answer would make sense if it is positive... So does this mean that when the electrons jump from n=5 to n=4, energy is emitted, but the energy has...
Sunday, December 6, 2015 by Sanaya

Chemistry
Can pi bonds be made from d-orbitals?
Sunday, December 6, 2015 by Sanaya

Chemistry
Let us assume that Cu(OH)2(s) is completely insoluble, which signifies that the precipitation reaction with NaOH(aq) (presented in the transition) would go to completion. If you had a 0.300 L solution containing 0.0230 M of Cu2+(aq), and you wished to add enough 1.31 M NaOH(aq...
Sunday, December 6, 2015 by Anonymous

Chemistry
the effective incoming solar radiation per unit area on earth is 342 W/M^2. of this radiation, 6.7 W/m^2 is absorbed by CO2 at 14993 nm in the atmosphere. how many photons at this wavelength are absorbed per second in 1 m^2 by CO2?
Saturday, December 5, 2015 by Anonymous

Chemistry
1) Balance the following equation in basic conditions: 2CoCl2 + Na2O2 --> 2Co(OH)3 + 4Cl^- + 2Na^+ 2) Balance the following equation in acidic conditions: H3AsO3 + I2 --> H3AsO4 +2I^-
Saturday, December 5, 2015 by Green

Chemistry
An excited ozone molecule, O3*, in the atmosphere can undergo one of the following reactions, O3* → O3 (1) fluorescence O3* → O + O2 (2) decomposition O3* + M → O3 + M (3)deactivation, where M is an inert molecule, the rate constant for the fluorescence ...
Saturday, December 5, 2015 by Anonymous

Chemistry (Gas)
A cylinder is filled with 120L of air at 101 kPa and 20*C. How long could the cylinder be used "just underwater" on earth assuming 2L is used every 5 seconds. I don't understand what the pressure and temperature would be "just underwater." Is it assumed...
Saturday, December 5, 2015 by A

chemistry
Stoichiometrics: a 36 grams sample of calcium hydroxide is allowed to react with 40.5 grams of phosphoric acid according to the following reaction. 3Ca(OH)2 + 2H3PO4 = Ca3(PO4)2 + 6H2O how many grams of calcium phosphate are produced? how many moles of Calcium phosphate are ...
Saturday, December 5, 2015 by kevin

chemistry
Devils food cake has a [H+] of 2.7 x 10-8 mol/L. calculate pH pOH [OH-]
Saturday, December 5, 2015 by emilio

chemistry
a 36 grams sample of calcium hydroxide is allowed to react with 40.5 grams of phosphoric acid according to the following reaction. how many grams of calcium phosphate are produced? how many moles of calcium phosphate are produced? how many moles of excess reagent remain? if 43...
Saturday, December 5, 2015 by kevin

Chemistry
At the start of a road trip, the pressure of the air in a car tire is 276kPa and the temperature is 12.0 degrees Celsius. After driving for some time the pressure in the tire is now 303kPa. Assuming that the volume of the air inside the tire remains constant, determine the new...
Saturday, December 5, 2015 by Joseph

chemistry
a 36 grams sample of calcium hydroxide is allowed to react with 40.5 grams of phosphoric acid according to the following reaction.
Saturday, December 5, 2015 by kevin

Chemistry
. A typical polyethylene bag from a grocery store weighs 12.4 g. How many molecules of ethylene, C2H4, must be polymerized to make such a bag?
Saturday, December 5, 2015 by Anonymous

chemistry
Which law of chemical combination is illustrated by the fact that 168g fe reacts with 72g H2O to from 232g Fe3 O4 and 8gH2?
Saturday, December 5, 2015 by farheen fathima

chemistry
How would your calculated %P2O5 value be affected if you had not used this blank solution
Friday, December 4, 2015 by sami

Chemistry
An unknown mass of caco3 was added to an excess of 2mol/dm3 hcl. Calculate the total volume of co2 evolved.
Friday, December 4, 2015 by Tan

Chemistry
Calculate the final temperature in degrees Fahrenheit of 1.25 liters of gas X at 85 degrees Celsius and 2700 mm/Hg, if the pressure is changed to 2.35 atmospheres and the volume is increased to 2500ml
Friday, December 4, 2015 by Kevin

Chemistry
if 16.5 liters of gas X is at 398 torr and -90.5 degrees celsius, what would be the volume of this same gas if the pressure is changed to 3.1 atmospheres and the temperature is changed to 399K
Friday, December 4, 2015 by Kevin

chemistry
Which law of chemical combination is illustrated by the fact that 168g fe reacts with 72g H2O to from 232g Fe3 O4 and 8gH2?
Friday, December 4, 2015 by farheen fathima

Chemistry
How many grams of cesium chloride (CsCl) will be needed to make 750. mL of a 0.100 M CsCl aqueous solution? The formula mass of CsCl is 168.36 g/mol Molarity: M = (mol solute) / (L of solution)
Friday, December 4, 2015 by Mark

Chemistry
The highest temperature ever recorded in Palm Desert, California, was 122„aF. Express this temperature in degrees Kelvin.
Friday, December 4, 2015 by John

chemistry 101
The value of kp at 20°c for the reaction 2NO(g) + Cl2(g) 2NOCl(g) is 1.9x10^3 atm-1 calculate the value of KC at the same temperature.
Friday, December 4, 2015 by Sidney

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Homework Help: Science