1.)
A.) Convert 1.35 ✕ 102 grams to milligrams. Enter your answer using standard scientific or "e" notation and the correct number of significant figures (for example, 105 = 1.05e2).
B.) How many grams are in 1.120 kilograms? Enter your answer using standard scientific or "e" notation and the correct number of significant figures (for example, 105 = 1.05e2).
C.) What is the final volume of 180. mL of oxygen gas at 60.0°C if the gas is heated to 213°C? Assume the pressure and the amount of gas are held constant.
D.) What mass of propane gas, C3H8, will occupy 440. mL at 570. mm Hg and 52.5°C?
E.) What is the final pressure of 925 mm Hg of carbon dioxide gas at 224°C if the gas is cooled to 77.5°C? Assume that the volume is held constant.
F.) What is the final volume of 630. mL of neon gas at 183°C if the gas is cooled to 39.0°C? Assume the pressure and the amount of gas are held constant.
In: Chemistry
*Solve the question with arbitrary number* Thank you!
1.
a. Each milliliter of an otic solution (Auralgan) contains the following ingredients. Calculate the amount of benzocaine required to manufacture (a given #) 12 mL containers of this product. (Answer to the nearest tenth of a gram – one decimal point)
Antipyrine (a given amount) mg
Benzocaine (a given amount) mg
Dehydrated glycerin to make (a given volume) mL
b.
Given the following prescription for a child (a given #) pounds. If the dose of ranitidine for a child is (a certain # of mg/kg/day) how many of a (a given strength of a tablet) tablets are needed to prepare the following prescription? (Answer to the nearest whole tablet - no decimal point)
Rx
Ranitidine _____
Cherry syrup qsad 120mL
Sig: One teaspoonful twice daily for 8 days
In: Chemistry
1) What is the pH at the equivalence point in the titration of a 21.9 mL sample of a 0.456 M aqueous hypochlorous acid solution with a 0.494 M aqueous potassium hydroxide solution?
pH =
2) When a 29.8 mL sample of a 0.430 M aqueous hydrocyanic acid solution is titrated with a 0.373 M aqueous potassium hydroxide solution, what is the pH after 51.5 mL of potassium hydroxide have been added?
pH =
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Calculate the Kovats retention index for an unknown using the following retention times: 1.2 min for CH4, 11.4 min for octane, 16.0 min for the unknown, and 17.1 min for nonane
In: Chemistry
Solid NaI is slowly added to a solution that is 0.0083
M Cu+ and 0.0091 M
Ag+.
Which compound will begin to precipitate first?
Calculate [Ag+] when CuI just begins to precipitate. Enter your answer in scientific notation.
What percent of Ag+ remains in solution at this point?
In: Chemistry
1.Why are there two different values for R?(R = 8.314472 JK-1mol-1 = 0.0820574 L atm K-1 mol-1
2.Why are liquid barometers filled with mercury rather than water?
3. Using the concepts of the kinetic theory of gases, describe WHY one gas will diffuse through another.
4. Why does hot air rise? Prove your answer using the ideal gas equation
5. Why do gases show a positive deviation from ideal behaviour at high pressures? (i.e Why don’t they only show negative deviations?)
In: Chemistry
Material Science- Corrosion is one of the processes that affects the reliability of all engineering components. It is very complicated process and many factors are affecting it. However, when it comes to the fundamentals, it is not as complicated as one think. Basically, corrosion occurs in metals and their alloys because they are with electrons that are not saturated in bond states. Because of this, the work function plays a critical role in determining the corrosion susceptibility of metallic materials.
1) Alternate way of presenting corrosion susceptibility of metals is to compare standard chemical potential of electrons in metals or standard half cell voltage of metals. What is the standard chemical potential of electronics and the standard half-cell voltage? Can you prepare table showing the a few elemental metals and their standard chemical potential as well as half-cell potential?
2) The standard half-cell voltage does indicate whether material in your hand is corrosion prone or not. However, there are a few exceptions on this such as Cr and Al. In case of Cr, its potential is very much in the negative range but is very good at withstanding corrosion (that is a basis of stainless steel). Briefly explain why this is the case.
3) The worst form of corrosion failure is the Galvanic corrosion. Explain what it is and why it is so problematic for the component reliability.
4) Crevice corrosion can be analyzed in the frame work of Galvanic corrosion even if there is no obvious component that can create Galvanic couple with your piece. Briefly explain what type of condition can make Crevice corrosion to be similar to Galvanic corrosion.
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is it possible to convert NO to N2O in our atmosphere? Explain why or why not
In: Chemistry
Please answer all numerically with three demical places. :)
A) What is the pH of a buffer prepared by adding 0.405 mol of the weak acid HA to 0.609 mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA is 5.66×10−7.
B) What is the pH after 0.150 mol of HCl is added to the buffer
from Part A? Assume no volume change on the addition of the
acid.
D) What is the pH after 0.195 mol of
NaOH is added to the buffer from Part A? Assume no volume change on
the addition of the base.
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Why is it necessary for scientists to understand chemical reaction rates?
In: Chemistry
a. What is the molar solublity of lead(II) chloride in water?
b. Should we be concerned about the chloride ion acting as a base? Why or why not?
In: Chemistry
A student mixes 50.0 mL of 1.00 M Ba(OH)2
with 81.2 mL of 0.450 M H2SO4.
Calculate the mass of BaSO4 formed.
Calculate the pH of the mixed solution.
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340.0 gallons of 15.0 M nitric acid were added to a lake. The initial pH of the lake was 6.40 and the final pH was 4.50 . If none of the acid was consumed in chemical reactions, determine the volume of the lake. (IN LITERS)
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When trying to purify fluorene, why does a NaOH extraction work best with Benzoic Acid, succinimide, and fluorenone but a HCl extraction works best with ethyl-4-aminobenzoate? Also, draw the acid/base reaction for each of the reactions.
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1.Please describe how hybridization tells you about chemical structures? What is a good rule of thumb about where groups are arranged around any central atom? Provide a reaction mechanism (i.e. movement of electrons shown) for an organic reaction to illustrate the answer from 1 , and explain how the shape of the molecule changes during a chemical reaction
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