Description 1. The half-life of cobalt-60 is 5.27 years. How many milligrams of cobalt-60 remain after 52.7 years if you start with 15 mg 2. A sample contains 12.0 mg of an unknown element. After 4.46 × 109 years, the sample will contain 3.00 mg of the unknown element. What is the half-life of the unknown element? Please make sure to show the work for each question.
Description Make sure that you are answering in complete sentences, and that your responses are detailed and thorough. Consider the equation for acetic acid plus water. CH3COOH + H2O ? CH3COO– + H3O+ Refer to Figure 3.1 on page 459 to compare the strengths of the two acids in the equation. Do the same for the two bases. Determine which direction—forward or reverse—is favored in the reaction.
Description The issue of whether to use and promote nuclear power is a contentious one. What if your state was considering building a nuclear power plant near your community? How would you feel? What reasons would you use to support or oppose the plant construction? Use what you have learned in this section as a starting point to create a reasoned letter to the editor of your local newspaper. In your letter, be sure to clearly state your position on nuclear power and the pending construction of the nuclear power plant. In your letter, address these issues: Safety Energy efficiency Cost *The time limit is one day but I'd really like this sooner than that*
Description A compound is found to contain 63.65 % nitrogen and 36.35 % oxygen by mass. To answer the question, enter the elements in the order presented above. QUESTION 1: The empirical formula for this compound is . QUESTION 2: The molar mass for this compound is 44.02 g/mol. The molecular formula for this compound is .
Description Explain why glucose and palmitic acid differ in their water solubility. Predict which molecule would more readily cross a biological membrane composed entirely of phospholipids, and justify your reasoning.
