Science Papers Help Online

“The solubility of benzoic acid in water is 6.8 g/100 mL at 95°C and 0.3 g/100 mL at 25°C. You are given 10 g of benzoic acid. Calculate the amount of water that you would use to recrystallize the sample. If the crystals are collected at 25°C what is the maximum possible recovery?”

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Could anyone help me with this. I’m very confused.

4. A sample of 1.00 L of gas at NTP conditions contains 20% oxygen and 80% nitrogen. Calculate the number of moles of each gas. Below are my calculations, but they don’t match other answers. I don’t know what I did wrong.

1.00 L / 22.4 L/mol = 0.04464 moles

  .04464 /5 = .008928 per 20%

  20% = .008928 mole

  80% = .008928 x 4 = .03571 mole

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Which of the following statements is incorrect about benzene? a. It has delocalized electrons. b. The carbon-carbon bond lengths are all the same. c. The carbon-hydrogen bond lengths are all the same. d. All twelve atoms lie in the same plane. e. All of the carbon atoms are sp hybridized.

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How do you convert the number of atoms into mass or mols?

How would you explain how the mol ratio is derived from the chemical equation and its fundamental importance in solving for amounts in chemical reactions?

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) Hybridization of the carbon atom indicated by (*) in CH3-*CH2-CH3, *CH2CH2, and CH3-*C≡CH is ________, ________, and ________, respectively.

A) sp3, sp2, sp

B) sp3, sp, sp2

C) sp, sp2, sp3

D) sp, sp3, sp2

E) sp2, sp3, sp

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Phenytoin

 a. Is 20-30% bound to albumin

 b. Is the drug treatment of choice in absence seizures

 c. Undergoes flow limited elimination

 d. Steady state mean plasma concentrations varies disproportionately

with the dose

 e. Preferentially binds to activated state sodium channels

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In one experiment, the mass of the metal block is 89.5 grams, the volume of water used is 97.6 mL, the temperature of the cold water extrapolated to the time of mixing is 19.8oC, and the temperature of the metal block and water extrapolated back to the time of mixing is 26.8oC. What is the amount of heat gained by th cold water? What is the molar mass of the metal? What is the specific heat of the metal?

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Define SPECIFIC HEAT CAPACITY.

a. The quantity of heat required to raise the temperature of 1 mole of a substance by 1*C

b. The quantity of heat required to change a system’s temperature by 1*C

c. The quantity of heat required to raise the temperature of 1 gram of a substance by 1*C

d. The quantity of heat required to raise the temperature of 1 kilogram of a substance by 1*F

e. The quantity of heat required to raise the temperature of 1 liter of a substance by 1*F

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You’re flying your 10,000-kg Scooty Puff Pro spaceship at a constant speed of 20 km/s in the positive x-direction. All of the sudden it malfunctions and the many of the thrusters are stuck on. The main thruster is stuck on producing a 800 kN force in the positive x-direction. Two of the small maneuvering thrusters are also stuck on, one producing a 100 kN force in a direction 30° from the positive y-direction towards the negative x-direction, and the other is producing a 150 kN force in a direction 10° from the negative y-direction towards the negative x-direction. After 2 minutes of this the two maneuvering thrusters shut off and the main thruster decreases in magnitude to 200 kN, while still applying the force in the positive x-direction. It takes an additional 6 minutes to fix the problem and turn all of them off. How far and in what direction would you have to travel to get to where you would have been if the malfunction had not occurred.

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1. Go to the American Lung Association at http://www.lung.org/our-initiatives/research/monitoring-trends-in-lung-disease/estimated-prevalence-and-incidence-of-lung-disease/ (Links to an external site.)
2. Links to an external site.
3.  and look at the report on the prevalence and incidence of lung disease.
4. Examine the statistics for your state or county/parish, and compare those to four others, choosing states or counties/parishes that differ in climate, location, income, or education level as your comparison. Please note: If you choose to compare counties/parishes, you should do so within your own state.
5. What do you notice about the differences in rates of lung disease between your location and others?
6. Are there significant differences?

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