Question 3. A specific water-based paint (y=62 mN/m, p=1050 kg/m3) has a contact angle of 60 degrees on a certain steel. How large an area can you coat on a horizontal plate with 100 mL? In general, adding surfactant decreases the contact angle. A specific surfactant is supposed to reduce the contact angle to 20 degrees and the surface tension to y=38 mN/m. How much does the coated area increase? For simplicity assume that the rim is an edge rather than being curved.

3. Consider the reaction: 2 H2(g) + 2NO(g) 2 H,0 (g) + N, (9) The initial reaction rates of four mixtures of H, and NO were measured at 900c with the following results: (10 pts) Experiment [H.]. (M) [NO], (M) Initial Rate (M/s) 1 0.212 0.136 0.0248 2 0.212 0.272 0.0991 3 0.424 0.544 0.793 4 0.848 0.544 1.59 a) b) c) Determine the rate law for this reaction. Calculate the rate constant. What is the unit of rate constant? What is the rate of reaction if the initial concentrations of H, and NO were 1.0 M and 2.0 M, respectively.

A uniform magnetic field passes through a horizontal circular wire loop at an angle 18.1° from the normal to the plane of the loop. The magnitude of the magnetic field is 3.35 T, and the radius of the wire loop is 0.280 m. Find the magnetic flux Ø through the loop. Φ = Wb

Select [a]: True or [b]: False for the following statements. It has been found that cities with more coffee shops have more car accidents; therefore, coffee shops cause poor driving When ice cream sales go up, so do crime rates. A reasonable conclusion is that the increase in ice cream sales causes an increase in the crime rate. Studies have shown that people who eat more fast food are generally more obese than those who do not; therefore, a conclusion is that eating fast food is related to obesity Association does not imply causation. Studies have show that obese people tend to eat more fast food; therefore, a conclusion is that obesity causes a person to eat more fast food a. True b. False

Find the periodic payment R required to amortize a loan of P dollars over t years with interest charged at the rate of r%/year compounded m times a year. (Round your answer to the nearest cent.) P = 80,000, r = 2.5, t = 12, m = 4

4 Insert the rubber stoppers. Mix cach solution thoroughly 5. Transfer a solution into a Spec 20 cell (fill up to 2/3 of the length) and measure the absorbance of the solution at 450 nm. Record and plot the data 6. Calculate the k value by linear regression - use provided space in the results section. 5. Using the zero knob, set the transmittance to "0" Now, Spec 20 will consider this situation as the complete darkness. 6. Insert a Spec 20 cell (looks like a small test tube) filled with distilled water (reference) in the sample chamber 7. Using 100 % knob, set the transmittance to 100. The concentration of the substance in the solution at this point is O and the light is 100 % transmitted. 8. Remove the reference. 9. Set Mode to Absorbance, insert your sample and read the number displayed. This is your absorbance for the sample. 10. You have to perform steps 2-8 whenever the wavelength setting is changed. Otherwise, keep the Mode at Absorbance and just replace your sample to read off the absorbance value. Determining the equilibrium constant NOTE: This part of experiment requires, 1. 0.0025 M Fe(NO3)3 solution, NOT the diluted solution you prepared. 2. 0.0025 M KSCN solution, NOT 1 M. 1. Wash and dry pipets, test tubes and rubber stoppers. Renumber the test tubes (6 to 10). 2. Prepare the five solutions shown in Table 6.2. Use a properly rinsed Mohr pipet for each solution. Table 6.2 Composition of solutions for determining the equilibrium constant Test Tube 0.0025 M 0.0025 M 0.1 M number Fe(NO3)3 KSCN HNO3 6 1.0 1.0 5.0 7 1.0 2.0 4.0 8 1.0 3.0 3.0 9 2.0 2.0 3.0 Determining k in Beer's Law CAUTION: DO NOT put the pipet directly into the stock bottle. Such practice will change the concentration of the stock solution and make it unusable. Instead, obtain a small beaker to take some stock solution to your bench. 1. Rinse a pipet with a 0.0025 M solution of Fe(NO3)3 (in 0.1 M HNO3). Use this Mohr pipet to transfer exactly 4 mL of the Fe(NO3)3 solution to a 100-ml volumetric flask. Add distilled water till the bottom of the meniscus coincides with the marking on the flask. Use a disposable dropper if needed. Mix the solution thoroughly 2. Label 3 pipets with diluted Fe(NO3)3, 1 M KSCN and 0.1 M HNO3 and rinse with corresponding solutions. 3. Using the pipets, prepare following 5 solutions (Table 6.1) in the 5 cleaned and dried large test tubes. All amounts are given in mL. Table 6.1 Composition of solutions for Beer's Law. Test Tube Diluted 0.1 M number 1 M KSCN Fe(NO3)3 HNO3 10 2.0 3.0 2.0 3. Stopper the tube and mix each solution thoroughly. 4. Measure the absorbance of each solution at 450 nm. Record your data. 5. Calculate the concentration of Fe(SCN)+2 in each solution using the absorbance and the Beer's Law. 6. Calculate the initial concentration of Fe(NO3)3 and KSCN using the table given above. 7. Calculate the final concentration of Fe(NO3)3 and KSCN using the data from step 6 and stoichiometry of the reaction. 8 Calculate the equilibrium constant for each solution. Calculate the mean value of Keq with its standard deviation. 1 1.0 5.0 4.0 2 2.0 5.0 3.0 3 3.0 5.0 2.0 4 4.0 5.0 1.0 9. 5 5.0 5.0 0 Discard all solutions into the proper waste container -40 1. Determining k in Beer's Law 2. Determining the equilibrium constant Test Tube No. Absorbance Test Tube No. Absorbance 1 6 146 291 2. 7 230 3 8 426 945 4 9 -492 1.560 5 10 Post Laboratory Questions 1. Complete the following table and calculate k-value for the Beer's Law. All concentrations should be in M. [Fe(SCN)*2) CA Test Tube No. Absorbance A c? Diluted Fe(NO3)3 (mL) С 0 0 Reference 0 0 0 1 1.0 0.0000140 LxD 2 2.0 6 0000400 3 3.0 0.0001378 4 4.0 .402 (2000 1968 leylo 2000293 2,5 x 10 7 5 5.0 . 5860 Co consume a CoomL) 40.ooorm Fescarta --43 2. Determining the equilibrium constant by filling the following table. Starting [Fe) Starting [SCN) Test Tube No. [Fe(SCN)*2) from A Eq. [Fe+3] Eq. [SCN1 Kea 6 7 6.005 8 0.0035 0.00 B 9 10 6.olas Sample calculation for obtaining initial [Fe+") and (SCN): Fe + SCN Fe (SCN) Sample calculation for obtaining [Fe(SCN)*2; from absorbance: Sample calculation for the equilibrium [Fe3+]: Sample calculation for the equilibrium (SCN): Sample calculation for Ke [Fe (sco) Keq [Fe +3 ] [sc]

Accrued Product Warranty Harbour Company disclosed estimated product warranty payable for comparative years as follows: (in millions) Current Year Prior Year Current estimated product warranty payable $13,350 $12,800 Noncurrent estimated product warranty payable 8,120 7,157 Total $21,470 $19,957 Assume that Harbour's sales were $157,449 million in current Year and that the total paid on warranty claims during the current year was $13,763 million a. The distinction between short- and long-term liabilities is important to creditors in order to accurately evaluate the near-term cash the business relative to the quick current assets and other longer-term b. Provide the journal entry for the current Year product warranty expense. Enter your answers in millions. If an amount box does not require an entry, leave it blank. c. What two conditions must be met in order for a product warranty liability to be reported in the financial statements?