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Chemistry

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Questions (126)

Imagine that you have an ideal gas in a 7.00L container, and that 1050 molecules of this gas collide with a square-inch area of
1. 4 answers
2. 2,490 views
How do you know which elements are solids, liquids, and gases at STP?
1. 3 answers
2. 988 views
Al3+ and Pb2+ act as acids or bases in acidic or alkaline environment.True or False? I think this is true because they are
1. 1 answer
2. 411 views
Which of the following does form a Group II cation?lead iron cobalt nickel How do you figure this one out? You must know what is
1. 1 answer
2. 641 views
I need some help with calculating percent yield and percent purity of aspirin.Here's my data (questions follow): SYNTHESIS Mass
1. 3 answers
2. 1,761 views
I asked this question yesterday and it was answered, but I still have a question on it.Standard entropies for substances are
1. 1 answer
2. 1,214 views
A certain mine produces 2.5 108 kg of copper from chalcopyrite (CuFeS2) each year. The ore contains only 0.80% Cu by mass.(a) If
1. 3 answers
2. 2,230 views
If 142.38 g of l water at 21.7 degrees C is placed into a syrofoam cup with 174.36 g of ice at -27.5 degrees C what would be the
1. 2 answers
2. 1,221 views
A combustion bomb containing 5.417 g of aluminum metal and 15.974 g of iron III oxide is placed in an ice calorimeter that
1. 2 answers
2. 551 views
For each of the following, write the electron configuration and Lewis symbol:A. In B. In- C. K+ D. I-
1. 2 answers
2. 729 views
How do I figure out how to write the lewis symbol for the followingA. Br B. Br- C. Sr D. Sr2+
1. 1 answer
2. 347 views
Write the electron configuration of Sn and Sn2+Give the electron configuration of Cu+ and Cu2+
1. 5 answers
2. 4,246 views
Arrange the members of each of the following pairs in order of increasing radius and explain the order:A. Te, Te2- B. Al, Al3-
1. 4 answers
2. 1,727 views
Which has the larger radius N^3- or P^3-?Please Explain
1. 5 answers
2. 863 views
Arrange the following in order of increasing ionic radius: I^-, Cs+, and Te^2-. Explain this order
1. 1 answer
2. 512 views
Use Lewis symbols to represent the electron transfer between the following atoms to give ions with noble gas configuations:A. Mg
1. 2 answers
2. 1,222 views
The amount of heat required to raise temperature of 55.85 g of iron 1 degrees C is called itsA. Change of energy B. Enthalpy C.
1. 2 answers
2. 1,006 views
Which of the following has a standard enthalpy of formation value of zero at 25 degrees C and 1.0 atmA. Fe(s) B. Fe2O3(s) C.
1. 7 answers
2. 6,682 views
Can some one read my lab report for me...I have it almost finished.. I just need help on the discussion part Please
1. 17 answers
2. 633 views
The specific heat of water is at 4.184J/g * degree C. How much heat is evolved, or absorbed, when the temperature of 9.00 mol of
1. 6 answers
2. 751 views
N2 + 3H2 --> 2NH3At 25°C (delta)Ho = -92.22 kJ and (delta)So = -198.53 J/K. Using this information, calculate the equilibrium
1. 1 answer
2. 781 views
Directions: Use the principles of atomic structure and/or chemical bonding to explain each of the following. In each part, your
1. 4 answers
2. 2,058 views
My problem is calculate the molarity of HCl and NaOH(molarity of acid)x(volume of acid)=(molarity of base)+(volume of added
1. 1 answer
2. 544 views
If i used NaCl to try to precipitate Ag+ from a solution, will it be as effective as HCl?
1. 1 answer
2. 348 views
Ammonia has the formula NH3. Household ammonia is a dilute aqueous solution of NH3 . Aqueous ammonia is a base that can
1. 7 answers
2. 2,072 views
so i got a test and like usual my teacher didn't teach me half of the stuff that's going to be on it so he gave us a pretest of
1. 2 answers
2. 626 views
me again8. You are given two beakers, A and B, with colorless liquids in htem. What two tests would you perform to determine
1. 2 answers
2. 544 views
How many mL of .200M acetic acid are mixed with 13.2mL of.200M sodium acetqte to give a buffer with pH=4.2
1. 9 answers
2. 1,923 views
Vitamin B12, cyanocobalamin, is essential for human nutrition. It is concentrated in animal tissue but not in higher plants.
1. 4 answers
2. 3,134 views
Fe2O3(s) + 2 Al(s) 2 Fe(l) + Al2O3(s)Suppose we want to make 18.0 grams of iron. We must figure out how much starting material
1. 5 answers
2. 654 views
Write the balanced equation for the combustion of octane (C8H18). Assuming that gasoline is 100% octane, with a density of 0.692
1. 4 answers
2. 1,342 views
Hi, please help!Question: Farmers added Calcium hydroxide to soil one morning. They then planned to add Ammonium chloride
1. 2 answers
2. 612 views
You helped me earlier today whith one of these problems... and i have two more......What is the ionic and net ionic equation? 1.
1. 13 answers
2. 549 views
explain why the name of the insect millipede doesnt follow SI conventions?please help me i cant find this any where in my text.
1. 3 answers
2. 744 views
using only words and no numbers how would i explain the steps necesarry to show how many kilograms are in a milligram? thanks :D
1. 1 answer
2. 315 views
Calculate the change in energy when 665.0 g of CH3OH(g) completely reacts at a constant temperature of 300 K and constant
1. 2 answers
2. 634 views
How many milliliters of 0.355 M NaF solution are needed to react completely with 24.6 mL of 0.216 M CaCl2 solution? How many
1. 2 answers
2. 552 views
Buffers work by converting _____ to ____.
1. 1 answer
2. 321 views
Calculate the number of moles K2CO3 of and MgCl2 in the 15 ml aliquots of reagent solution
1. 1 answer
2. 379 views
what is the chemical balance equation for the following:Magnesium metal and hydrochloric acid copper matal and hydroshloric acid
1. 3 answers
2. 425 views
Calculate DeltaHrxn for the following reaction:C + H2O --> CO + H2 Use the following: C + O2 --> CO2 DeltaH = -393.5 kJ 2CO + O2
1. 2 answers
2. 1,122 views
A 53 mL sample of a solution of sulfuric acidis neutralized by 37 mL of a 0.18 M sodium hydroxide solution. Calculate the
1. 1 answer
2. 465 views
Explain the Hyberdaization scheme for the central atom&the molecular geometry of CO2.
1. 3 answers
2. 414 views
What volume of 0.250M KOH is required to titrate 2.30 x 10^3 mol of the weak acid H2C2O4 ?I know the answer is 18.4, but can you
1. 4 answers
2. 1,429 views
A solution of AuCl- is mixed with a solution of Sn2+ under standard conditions. What is the equation? the answer is2AuCl4- +
1. 5 answers
2. 1,277 views
How to balance the following equation:I2 + Cl- = ?
1. 1 answer
2. 316 views
Write equatios for the ionization of the following acids.(a)HF , (b)H2SO3 , (c)CH3COOH , (d)HNO3.
1. 1 answer
2. 389 views
The half-life of a first order reaction is determined to be 92.0 years. How long will it take for the concentration of the
1. 3 answers
2. 1,112 views
Can someone please tell me the heat of fusion for Lauric Acid, Oxalic Acid, and Cetyl Alcohol? I've looked and can't find them
1. 1 answer
2. 353 views
I have all of the answers but this one so if anyone knows this answer, i can trade you :)I tried using the formulas that were
1. 1 answer
2. 378 views
How many grams of sucrose are needed to make 875 mL of a 39.0% (w/v) sucrose solution?
1. 4 answers
2. 2,615 views
the hydronium ion concentration of a 0.050 M solution of a weak acid is 5.9 X 10^-3 M. the acid-dissociation constant is 1.37 X
1. 2 answers
2. 608 views
Hypobromous acid,HOBr, has acid -ionization constant of 2.5 X 10^-9 at 25 Celsius . What is the pOH of a 0.63 M HOBr solution?A4
1. 3 answers
2. 3,442 views
What is the equilibrium concentration of chloroacetic acid in a solution prepared by dissolving 0.0314 mil of chloroacetic acid
1. 2 answers
2. 1,338 views
What is the percent ionization of a solution prepared by dissolving 0.0286 mol of chloroacetic acid in 1.60 L of water? For
1. 3 answers
2. 568 views
in a 0.01 M solution of 1.4 butanedicarboxylic acid, (Ka1=2.9x10^-5, Ka2=5.3x10^-6), which species is present in the lowest
1. 2 answers
2. 909 views
Mark below all of the statments that correctly describe the physical properties of glass.Glasses do not have slip systems.
1. 39 answers
2. 1,458 views
For a solution of 3.3 M H2CO3 (Ka = 4.4 × 10-7), calculate:(a) [H+] ____?______M (b) pH _____??______ (c) percent ionization
1. 1 answer
2. 911 views
The value of the equilibrium constant (Kp) as represented by the first chemical equation is 2.00 x 10-2 at 730 K. Calculate the
1. 2 answers
2. 529 views
The value of the equilibrium constant, Kc, at a certain temperature is 2.56 x 10-1. If the reaction quotient for a mixture of
1. 2 answers
2. 950 views
The value of the equilibrium constant, Kc, at a certain temperature is 2.50 x 102. If the reaction quotient for a mixture of
1. 2 answers
2. 760 views
The value of the equilibrium constant, Kc, at a certain temperature is 2.56 x 10-1. If the reaction quotient for a mixture of
1. 2 answers
2. 995 views
At 565 K the value of Kp for the equilibrium represented by the balanced equation is 2.00 x 10-1. Calculate the value of Kc at
1. 1 answer
2. 387 views
At 1650 °C the value of Kc for the equilibrium represented by the balanced equation is 2.38 x 10-1. Calculate the value of Kp
1. 3 answers
2. 397 views
The value of the equilibrium constant, Kc, at a certain temperature is 8.33 x 10-4. Would the reaction as represented by the
1. 3 answers
2. 504 views
Electron exhibiting a particle wavelength of 5.2 x 10-9 are emitted from hydrogen atoms after interaction with high energy
1. 6 answers
2. 549 views
Convert the following energy units.905 kJ to J 2970 kcal to kJ 5.21 × 106 J to kcal
1. 1 answer
2. 453 views
A 56.59 g sample of a substance is initially at 20.5 °C. After absorbing 1267 J of heat, the temperature of the substance is
1. 1 answer
2. 676 views
If you have 320.0 mL of water at 25.00 °C and add 140.0 mL of water at 95.00 °C, what is the final temperature of the mixture?
1. 3 answers
2. 562 views
Calculate the number of grams of xenon in 3.566 g of the compound xenon tetrafluoride.
1. 3 answers
2. 602 views
Calculate the formula mass for each of the following halogen compounds to five or more significant figures:?bake asked 5 months
1. 3 answers
2. 1,577 views
Calculate the number of grams of xenon in 3.566 g of the compound xenon tetrafluoride.
1. 3 answers
2. 2,915 views
Br2(l)+Cl2(g) (double arrow) 2BrCl(g)dH=+29.4 kJ/mol I am having trouble understanding this. Will the system shift left, right,
1. 3 answers
2. 1,420 views
To what temperature would the reaction below need to be heated to have a rate constant of 8.474e-4 M-1s-1 if the rate constant
1. 2 answers
2. 567 views
The initial concentration of PCl5 was 0.1983 M. It was allowed to decompose at some temperature until equilibrium had been
1. 2 answers
2. 524 views
If an explanation for correct answer could be provided, that would be great! Which equilibrium constant indicates that the
1. 1 answer
2. 393 views
Method for getting correct answer for this? Thank you! A mixture containing an initial concentration of 0.1877 M for H2 and
1. 3 answers
2. 562 views
Method for getting correct answer for this? Thank you!For the reaction A ↔ 2B K = 3.80x10-7 , if one started with 0.154 M A
1. 2 answers
2. 512 views
Method for getting correct answer? Thank you!What is the value of Kc at 226.85 °C for the reaction below if Kp is 6.24e-3 at
1. 3 answers
2. 522 views
Method for how to get answer? Thank you!For the equilibrium reaction below. To what is Kc equal? N2(g) + 3H2(g) ↔ 2NH3(g) a.
1. 2 answers
2. 580 views
Method for getting correct answer? Thank You!What is Kp for the reaction below, if Kc = 1.13e-3 at 111.2°C? 4A(s) + 5B(g) ↔
1. 1 answer
2. 410 views
Method for getting correct answer? Thank you!Initially there were equilibrium concentrations of 0.1887 M A, 0.1042 M B. Which of
1. 3 answers
2. 503 views
Method for getting correct answer? Thank you!The reaction below is an endothermic reaction. What would one have to do to shift
1. 3 answers
2. 642 views
Method for getting correct answer? Thank you!Initially there were equilibrium concentrations of 0.1887 M A, 0.1042 M B. Which of
1. 1 answer
2. 395 views
Find the Qsp when 5 mL of 0.17 M K2 CO3 (aq) and 1 L of 0.013 M AgNO3(aq) are mixed together. The solubility product of Ag2CO3
1. 2 answers
2. 530 views
Calculate the volume of 2.00 M solution of KOH that is required to neutralize 30.0 mL of 1.00 M solution of HNO3.
1. 2 answers
2. 746 views
1. Spectroscopic studies of the reaction of azide ion with the cluster [Ru3(CO)12] in acetone solvent confirmed the occurrence
1. 1 answer
2. 508 views
How can i get the step by step procedure for a chemical reaction?For example: the step by step procedure for the synthesis
1. 3 answers
2. 546 views
Consider the following reaction: 2 Mg + O2 → 2 MgO ΔH rxn = -1203 kJCalculate the amount of heat (in kJ) associated with
1. 5 answers
2. 6,470 views
Consider the following equation: CO + 2 H2 → CH3OH ΔH rxn = -128 kJCalculate the amount of heat (in kJ) associated with
1. 4 answers
2. 1,290 views
A 4.0−L sample of a 6.3M NaCl solution is diluted to 50L .What is the molarity of the diluted solution? How would I set this
1. 4 answers
2. 1,869 views
Transition metals (also called heavy metals) form insoluble compounds with hydroxide ions. Therefore, it is possible to extract
1. 1 answer
2. 518 views
A 44.8−mL sample of a 7.0M KNO3 solution is diluted to 1.10L What volume of the diluted solution contains 16.0g of KNO3?Would
1. 2 answers
2. 714 views
A hard water sample contains 0.0081 %Ca by mass (in the form of Ca2+ ions)What mass of water in grams contains 1.3g of Ca?(1.3g
1. 3 answers
2. 2,432 views
An ethylene glycol solution contains 26.2g of ethylene glycol (C2H6O2) in 81.4mL of water. Calculate the freezing point of the
1. 5 answers
2. 3,272 views
How many moles of each of the following are needed to give the same freezing point lowering as 5.0mol of the nonelectrolyte
1. 4 answers
2. 1,236 views
How many moles of each of the following are needed to give the same freezing point lowering as 5.0mol of the nonelectrolyte
1. 3 answers
2. 1,108 views
Aerosol cans carry clear warnings against incineration because of the high pressures that can develop upon heating. Suppose a
1. 2 answers
2. 822 views
What is the pressure in millimeters of mercury of 0.0140mol of helium gas with a volume of 222mL at a temperature of 30∘C?
1. 2 answers
2. 534 views
A sample of gas has a mass of 0.580g . Its volume is 119mL at a temperature of 80∘C and a pressure of 743mmHg .Find the molar
1. 2 answers
2. 535 views

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