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Chemistry

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is it a physical or chemical change when dry ice sublimates?
1. 1 answer
2. 23 views
Short and sweet definition of deposition in chemistry
1. 1 answer
2. 32 views
Short and sweet definition of deposition
1. 1 answer
2. 21 views
What is one word for the following sentence:The temperature at which a liquid completely changes into a solid when heat is
1. 1 answer
2. 27 views
Give one word for the following sentence:The temperature at which a liquid completely changes into a solid when heat is removed
1. 1 answer
2. 23 views
the following values are the only energy levels of a hypothetical one electron atom:E6= -2x10^-19J, E5= -7x10^-19L E4=
1. 1 answer
2. 658 views
What is the balance equation of decane
1. 1 answer
2. 348 views
Ammonia is produced from the reaction of nitrogen to the following balanced equationN2+3H2-2NH3
1. 1 answer
2. 554 views
What is the molecular geometry shape for H2GeO and is Sel2 polar or non polar. Thanks
1. 1 answer
2. 5,923 views
The half-life of rubidium-87 (natural absorbance 27.83%) is 5.1x10^11 years. What mass of rubidium is present if an average
1. 1 answer
2. 552 views
2.40g of copper (ii)tetraoxosulphate(iv) crystals are prepared from 0.45g of copper (ii) oxide.the copper (ii)
1. 2 answers
2. 2,230 views
The molecules present in 5.2gms of glucose will be c6h12o6
1. 1 answer
2. 396 views
For preparing a set of standard solutions of FeNCS2+, the equilibrium molar concentration of FeNCS2+ is assumed to equal the
1. 1 answer
2. 1,987 views
Given the equation C3H8+5O2->3CO2+4H2O.1.)Suppose 1.5 moles of C3H8 will be used, How many moles of H2O and CO2 will be formed?
1. 1 answer
2. 2,274 views
How to prepare 10% sucrose solution enriched with 0.1% phenylalanine? And also how to make the stock solution of phenylalanine
1. 1 answer
2. 782 views
Neutralization of water containing H2SO4 and HNO3 with CaSO3.What is the pH in water if the volume is 1000 liter and the
1. 2 answers
2. 471 views
How many mole are there in calcium chloride, CaCl2 (CaCl2=111).
1. 11 answers
2. 3,995 views
NaCl [Symbol] Na + Cl2Type of reaction: synthesis KOH + HNO3 [Symbol] HOH + KNO3 Type of reaction: double replacement Ca + S
1. 1 answer
2. 1,357 views
Calculate the gram molecular mass of nitrogen if 360cc at STP weigh 0.45g.
1. 1 answer
2. 657 views
Why was etching needed to bring out the grain boundaries?My answer: Is it for the light to bounce back?
1. 2 answers
2. 598 views
How can you prepared to benzo phenol from phenyl magnetium bromide
1. 1 answer
2. 345 views
A gas mixture containing 0.400 mol He, 0.184 mol CH4 and 0.0374 mol Ne was placed in a 3.00-L flask at 301 K. What is the
1. 3 answers
2. 517 views
can someone help me on these 2 questions so i can get an idea to do the rest of mine.im given hydrochloric acid and a marble
1. 0 answers
2. 508 views
Based on the data in this table, what would be the value of k at 795 K?T k 625 1.1 x 10^-4 635 1.5 x 10^-4 645 2.0 x 10^-4 I
1. 1 answer
2. 479 views
Consider the reaction:SO2Cl2(g)⇌SO2(g)+Cl2(g) A solution is made containing initial [SO2Cl2]= 0.022M . At equilibrium, [Cl2]=
1. 1 answer
2. 2,002 views
An equilibrium mixture of the following reaction was found to have [I2]= 0.0325M at 1200 ∘C.What is the concentration of I ?
1. 1 answer
2. 2,993 views
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. 2 answers
2. 2,559 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. 1 answer
2. 580 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. 1 answer
2. 575 views
Aerosol cans carry clear warnings against incineration because of the high pressures that can develop upon heating. Suppose a
1. 1 answer
2. 861 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. 1 answer
2. 1,171 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. 1 answer
2. 1,294 views
An ethylene glycol solution contains 26.2g of ethylene glycol (C2H6O2) in 81.4mL of water. Calculate the freezing point of the
1. 3 answers
2. 3,340 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. 1 answer
2. 2,500 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. 1 answer
2. 766 views
Transition metals (also called heavy metals) form insoluble compounds with hydroxide ions. Therefore, it is possible to extract
1. 0 answers
2. 555 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. 3 answers
2. 1,931 views
Consider the following equation: CO + 2 H2 → CH3OH ΔH rxn = -128 kJCalculate the amount of heat (in kJ) associated with
1. 2 answers
2. 1,348 views
Consider the following reaction: 2 Mg + O2 → 2 MgO ΔH rxn = -1203 kJCalculate the amount of heat (in kJ) associated with
1. 2 answers
2. 6,547 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. 2 answers
2. 586 views
1. Spectroscopic studies of the reaction of azide ion with the cluster [Ru3(CO)12] in acetone solvent confirmed the occurrence
1. 0 answers
2. 551 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. 1 answer
2. 794 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. 1 answer
2. 566 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. 429 views
Method for getting correct answer? Thank you!The reaction below is an endothermic reaction. What would one have to do to shift
1. 2 answers
2. 702 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. 2 answers
2. 548 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. 447 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. 1 answer
2. 630 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. 1 answer
2. 572 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. 1 answer
2. 555 views
Method for getting correct answer for this? Thank you! A mixture containing an initial concentration of 0.1877 M for H2 and
1. 1 answer
2. 609 views
If an explanation for correct answer could be provided, that would be great! Which equilibrium constant indicates that the
1. 1 answer
2. 439 views
The initial concentration of PCl5 was 0.1983 M. It was allowed to decompose at some temperature until equilibrium had been
1. 1 answer
2. 571 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. 1 answer
2. 606 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. 1 answer
2. 1,478 views
Calculate the number of grams of xenon in 3.566 g of the compound xenon tetrafluoride.
1. 1 answer
2. 2,967 views
Calculate the formula mass for each of the following halogen compounds to five or more significant figures:?bake asked 5 months
1. 1 answer
2. 1,632 views
Calculate the number of grams of xenon in 3.566 g of the compound xenon tetrafluoride.
1. 2 answers
2. 648 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. 2 answers
2. 600 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. 0 answers
2. 707 views
Convert the following energy units.905 kJ to J 2970 kcal to kJ 5.21 × 106 J to kcal
1. 1 answer
2. 486 views
Electron exhibiting a particle wavelength of 5.2 x 10-9 are emitted from hydrogen atoms after interaction with high energy
1. 5 answers
2. 599 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. 2 answers
2. 580 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. 2 answers
2. 447 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. 423 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. 1 answer
2. 1,028 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. 1 answer
2. 799 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. 1 answer
2. 999 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. 1 answer
2. 583 views
For a solution of 3.3 M H2CO3 (Ka = 4.4 × 10-7), calculate:(a) [H+] ____?______M (b) pH _____??______ (c) percent ionization
1. 0 answers
2. 957 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. 1,557 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. 1 answer
2. 958 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. 2 answers
2. 613 views
What is the equilibrium concentration of chloroacetic acid in a solution prepared by dissolving 0.0314 mil of chloroacetic acid
1. 1 answer
2. 1,376 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. 1 answer
2. 3,506 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. 1 answer
2. 647 views
How many grams of sucrose are needed to make 875 mL of a 39.0% (w/v) sucrose solution?
1. 2 answers
2. 2,664 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. 417 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. 393 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. 2 answers
2. 1,150 views
Write equatios for the ionization of the following acids.(a)HF , (b)H2SO3 , (c)CH3COOH , (d)HNO3.
1. 1 answer
2. 429 views
How to balance the following equation:I2 + Cl- = ?
1. 1 answer
2. 340 views
A solution of AuCl- is mixed with a solution of Sn2+ under standard conditions. What is the equation? the answer is2AuCl4- +
1. 4 answers
2. 1,347 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. 2 answers
2. 1,496 views
Explain the Hyberdaization scheme for the central atom&the molecular geometry of CO2.
1. 2 answers
2. 448 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. 517 views
Calculate DeltaHrxn for the following reaction:C + H2O --> CO + H2 Use the following: C + O2 --> CO2 DeltaH = -393.5 kJ 2CO + O2
1. 1 answer
2. 1,187 views
what is the chemical balance equation for the following:Magnesium metal and hydrochloric acid copper matal and hydroshloric acid
1. 2 answers
2. 472 views
Calculate the number of moles K2CO3 of and MgCl2 in the 15 ml aliquots of reagent solution
1. 1 answer
2. 420 views
Buffers work by converting _____ to ____.
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2. 351 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. 1 answer
2. 613 views
How do you know which elements are solids, liquids, and gases at STP?
1. 1 answer
2. 1,108 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. 1 answer
2. 677 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. 360 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. 2 answers
2. 795 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. 635 views
Hi, please help!Question: Farmers added Calcium hydroxide to soil one morning. They then planned to add Ammonium chloride
1. 1 answer
2. 662 views
Write the balanced equation for the combustion of octane (C8H18). Assuming that gasoline is 100% octane, with a density of 0.692
1. 3 answers
2. 1,422 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. 4 answers
2. 767 views
Vitamin B12, cyanocobalamin, is essential for human nutrition. It is concentrated in animal tissue but not in higher plants.
1. 3 answers
2. 3,195 views

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