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Chemistry

1) A 0.00100 cubic cm of oil is dropped on the surface of a lake. It

spreads out creating a circular oil slick that is 94.2 cm in radius. Why does this suggest that the oil is made of discrete units (molecules)? What is the thickness of the oil slick? (Area of a circle is πr2).  If we assume that the oil slick is one molecule thick, estimate how "tall" an oil molecule is using the given data.  
For this question please say why does this suggest that the oil is made of discrete units (molecules)? and calculate the thickness and height of the oil slick.

2) Pepto-Bismol, an over-the-counter medication used for upset stomach

and diarrhea, contains 1,050. mg of bismuth subsalicylate in every 30.-mL. What is the weight/volume percent concentration of bismuth subsalicylate?

3) A 0.00100 cubic cm of oil is dropped on the surface of a lake. It

spreads out creating a circular oil slick that is 94.2 cm in radius. Why does this suggest that the oil is made of discrete units (molecules)? What is the thickness of the oil slick? (Area of a circle is πr2).  If we assume that the oil slick is one molecule thick, estimate how "tall" an oil molecule is using the given data.  
For this question please say why does this suggest that the oil is made of discrete units (molecules)? and calculate the thickness and height of the oil slick.

4) The Ka for hydrofluoric acid is 7.2 x 10^-4. Calculate the pH of a 0.35 M aqueous solution of HF.

5) A patient receiver 4.0 g NaCl in 8 hourshow many milliliters of a .90% (m/v) NaCl (saline) solution were delivered

6) The heat produced by the dissolution of ammonium nitrate is qm = +25.7 kl.mol-1 (per mole of solid). What mass of ammonium nitrate needs to be introduced in V = 1.0 L to cool it from 20 C to 5 C?

7)  What mass of GaO2 can be formed when 10.0 g of Ga2O3 and 16.0 g Ga react according to the equation below? Ga2O3 + 4 Ga → 3 Ga2O
A. 12.0 g
B. 26.0 g
C. 24.9 g
D. 26.8 g
E. 30.0 g

8) Honey is a much more viscous viscosity 

liquid than water. Define in the context of liquids.  Research    

     the chemical properties of honey and explain why this substance is more viscous than water. Compare  

     the chemical formula of honey to water in your response. 

9) When a 13.0 g block of aluminum is dropped into excess bromine the

aluminum reacts and 122.8 g of AlBr3 is recovered. What is the percent yield for this reaction? 2 Al (s) + 3 Br2 (l) → 2 AlBr3 (s)
A. 10.1 %
B. 90.4%
C. 128.5 %
D. 95.6 %
E. 10.6 %

10) interpret: Select the GRAPH tab to see a graph of temperature vs. time. Click the "-" button until the whole graph is visible. What does the graph look like during a phase change?

11) A contains 150 ml of 0.200M HNO2 3 a) Find the [H+

solution. Beaker B contains 150 ml of a 0.200M HNOsolution.

} of the solution in Beaker B. Show your work by writing a dissociation equation.

b) Draw the particle picture of each solution, showing how 6 HNO2 and 6 HNO3 particles dissolve in the aqueous solution.

11) supercritical fluid.two

In the unit 3 notes, supercritical carbon dioxide and its applications in extracting caffeine and CBD oil 

    were discussed. Define a  Research  other supercritical fluids and discuss their

    applications.                                                       

12) Teflon and I was wondering

if anyone knows, How is Teflon classified? Types of Teflon and what they use for in engineering

pur-new-sol

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