5. Write the anode and cathode reactions for a galvanic cell that utilizes the reaction: Ni+2Fe¹ → Ni²+ + Fe²+

Part C-Polarity Demonstration The results for the demonstration for polarity of various substances presented in the image below. Note that each vial has two liquid layers, water and oil. (Oil is a hydrocarbon chain.) Use this image to complete the following question.

7. Determine the empirical formula for a compound having 31.1% potassium 28.9% chlorine, and 40.0% oxygen. b) If the molar mass of this compound is 245.2 g/mol, what is the molecular formula?

8. Calculate the concentration of 85.9 moles of copper II sulfate, CuSO4, when it dissolves in 600.0 mL of water.

9. Pure ethanol, C₂H5OH, has a molar concentration of 17.2 mol/L. What volume will result when 10.0 mL of pure ethanol is diluted to create a new ethanol cleaning solution having a concentration of 10.3 mol/L? (3 marks)

10. How many grams of Mg(OH)2 are required to make a 550.0 mL solution with a concentration of 0.725 mol/L?

The elements on the Periodic Table have many uses ranging from use in food products, fertilizers, batteries, water disinfection lasers, and medical equipment. Your research must include information about the following: Start by choosing one element from the Periodic table and research the global issue that the element can be used to address (The element you choose should be the scientific solution). You must explain your solution using the element, and how it works to solve the global issue. Be sure to include statistics to show the effectiveness of your solution. Discuss and evaluate the implications of using your solution on ONE of the following factors: social, economic, political, environmental, cultural, moral and ethical factors (to evaluate the factor you need to discuss two positive effects of using the mixture on the factor and two negative effects of using your solution on the factor supported by statistics and evidence from research)

3. Put the following elements in order from highest to lowest: Si, S, and Cl. (a) electronegativity (b) atomic radius (c) ionization energy

1. Write the electron configuration and the orbital diagram for the following elements. Then, state how many valence electrons it has. A. Ca B. Fe C. Cl-1 D. Li E. Mg+2

2. Why does electronegativity increase as you move across the periodic table, and decrease as you move down. Please explain in detail.