10/13/21

stoichiometry help
Iron(III) oxide reacts with carbon to give iron and carbon monoxide:Fe2O3(s)+3C(s)→2Fe(s)+3CO(g)part a; how many grams of C are required to react with 25.1 g of Fe2O3part b: how many grams of CO... more
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10/12/21

Help me answer this!!!
You have found that 13.85mL of 0.112M sulfuric acid reacts with exactly 20.00mL of barium hydroxide solution of unknown concentration. What is the molarity of the barium hydroxide solution? Round... more
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10/12/21

K equilibria in reversible reactions
6. Consider the reversible chemical reaction A + B --> ABYou mix 1 mole of A with 1 mole of B in a 1 L container. At equilibrium, the amount of AB will be:(a)exactly zero moles (b)exactly... more
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10/11/21

Chemistry & forensics
The refractive index, nD, of common liquids changes much more significantly with temperature variations than is the case for solids, such as glass. The shape of the dispersion curve for liquids... more
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10/11/21

Topic: Co-Enzyme Q10 Question: Any evidence for the medicinal chemistry behind the use of the CAM agent. Do the chemical structure(s) relate to its effects?
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10/10/21

CHEm help please
A solution contains one or more of the following ions: Ag+, Ca2+, and Co2+. Lithium bromide is added to the solution and no precipitate forms. An excess of lithium sulfate is then added to the... more
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10/08/21

Color Temperature

Consider the following list of light sources. If the concept of color temperature cannot be applied to a particular source, indicate this by placing N/A in the indicated space to the left of the... more
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10/08/21

What is the implied +/- error of this measurement? (A, B, & C)
A liquid sample has a reported volume of 810 mL.A. What is the implied +/- error of this measurement? And, identify the certain digits and the uncertain digits in the measurement.B. If the volume... more
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10/07/21

Chemistry Emission Spectrum Question, ASAP!
Why does the hydrogen emission spectrum have fewer emission lines than argon and neon, for example, have in their emission spectrums? How does this relate to the fact that each emission line... more
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10/07/21

Please write the chemical equation of this equilibrium.

An unknown chemical (HB) was analysed. It is known that this chemical is a weak base. 1.94g of pure HB was completely dissolved in 32.00mL water. As it is titrated against 0.753M hydrobromic acid... more
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10/07/21

assume that the triethylamine added is completely dissolved in water.

Triethylamine (C6H15N) is an organic base which is useful in pesticide production and organic synthesis. It has a pKa of 10.75 and density of 726 kgm-3 . It will partially dissociate in water... more
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10/07/21

Please evaluate the final pH of the gastric acid.
Aspirin is a common drug for curing inflammation and fever. The active ingredient of aspirin is known as acetylsalicylic acid (C9H8O4). It is a monoprotic acid and protonates according to the... more
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10/07/21

percent by mass of acetic acid

Calculate the percent by mass of acetic acid in a vinegar solution which is 0.794 M acetic acid. Show all calculations.
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10/07/21

Acetic Acid in Vinegar
DATAVinegar                    Trial 1      Trial 2    Trial 3        Final Volume, mL             5.16        11.98    17.98Initial Volume in mL            ... more
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10/07/21

compressed 02 carried

Bottles of compressed O2 carried by climbers ascending Mt. Everest have an internal volume of 5.90 L. Assume that one such bottle has been filled with O2 to a pressure of 2025 psi at... more
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10/07/21

air pressure of an automobile
 The air pressure in the tires of an automobile is adjusted to 2.3 atm at a gas station in San Diego, where the air temperature is 20°C (68°F) and atmospheric pressure is 0.987 atm. After... more
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10/07/21

gas pressure expanding

Hot expanding gases can be used to perform useful work in a cylinder fitted with a movable piston (see Figure 6 below). If the temperature of a gas confined to such a cylinder is increased from... more
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10/07/21

atmospheric pressure
A balloon is partially inflated with 5.00 L of helium at sea level where the atmospheric pressure is 1.00 atm. The balloon ascends to an altitude of 1600 m where the pressure is 0.83 atm.... more
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09/29/21

Chemistry question on Ionic equations

A mixture is first made of 150 cm3 of a 0.200 mol.dm–3 solution of silver nitrate and ycm3 of a 2.50 mol.dm–3 solution of potassium cyanide. Thereafter, 100 cm3 of a 0.120 mol.dm─3 solution of... more
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09/29/21

What would the starting and final mass be in mol? What would the percent yield be?

Repost with more infoExperiment: A pinacol rearrangement In this experiment, the objective is to synthesize benzopinacolone from benzopinacolProcedure: Measure out 0.50 g of benzopinacol and... more
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09/29/21

Which is more polarizable K or Cs? Why?
Which is more polarizable K or Cs? Why?
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09/28/21

Atoms, Molecules and Ions
illustrate or show the solution:1. Compound A contains 1.333 g of oxygen per gram of carbon, whereas compound B contains 2.666 g of oxygen per gram of carbon. What chemical law do these data... more
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09/27/21

stoichiometry solution
estimate the amount of CO2 (in kg ) that you emit each year by driving. estimates the amount of CO2 (in kg ) that you emit each year by breathing. Come up with another question that you can use... more
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09/25/21

sigfigs Conversion
A backpacker wants to carry enough fuel to heat 2.8  of water from 27  to 100.0 .If the fuel he carries produces 36 of heat per gram when it burns, how much fuel should he carry? (For the sake of... more
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09/24/21

A-Level Chemistry Equilibrium Question
If solid PCl5 is heated to 200 degrees celsius, it vaporises and dissociates according to the equation: PCl5(g) <==> PCl3(g) + Cl2(g) Kp = 160kPa at 200 degrees celsius 90.0%... more
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