Other Chemistry Answers

Write the shorthand cell diagram of the following:

        1.  One beaker contains 0.15 M Cd(NO3)2 and a Cd metal electrode. The other beaker contains 0.20 M AgNO3 and a Ag metal electrode. The net ionic equation for the reaction is written:

        1)  2Ag+ (aq) + Cd (s) à Cd2+(aq) + 2Ag (s)

         2) Cu(s)+2Fe 3+ (aq)→Cu 2+ (aq) +2Fe 2+ (aq)

You need to conduct an antioxidant activity test using a plant crude extract. Using a 10 mg of extract, calculate the stock solution of 1 mg/ml which later needs to be diluted into various concentration; 100, 50, 10, 5, 1 and 0.5 µg/ml in ethanol. Assume final volumes that need to be prepared for each concentrations is 20 ml.

Answers need to include:

1.      Preparation of 1 mg/ml stock solution

2.      Preparation of 6 concentrations of extracts

You need to conduct an antioxidant activity test using a plant crude extract. Using a 10 mg of extract, calculate the stock solution of 1 mg/ml which later needs to be diluted into various concentration; 100, 50, 10, 5, 1 and 0.5 µg/ml in ethanol. Assume final volumes that need to be prepared for each concentrations is 20 ml.

Answers need to include:

1.      Preparation of 1 mg/ml stock solution

2.      Preparation of 6 concentrations of extracts

Solve the following problems using the correct format. Given first, what is asked for, and the formula together with the solution. State the final answer in a sentence form. Use the back page as your answer sheet.

c. What is the new pressure of a gas at constant volume which was heated from 25⁰C at 1.5 atm to 35⁰C?

d. At a particular temperature and pressure, 0.4 mol of O₂ occupies a volume of 950 mL. What volume would 0.52 mol of oxygen gas have under the same conditions?

e. A 2.0 mol of N₂ occupies a volume of 770 mL at a particular temperature and pressure. How many moles of nitrogen gas under the same conditions would occupy a 1025 mL?

f. If 25 grams of Cl₂ occupies a volume of 5.5 L at a particular temperature and pressure, what volume will 3.00 g of chlorine gas occupy under the same conditions?

g. Travelling during hot days, drivers are advised to decrease the pressure of their vehicle’s tires . Explain why? 

Thank you for your answers

140 g of S2Cl2 was collected from the reaction of 640 g of Sulfur and 142 g of Chlorine. Compute for the percent error.