General Chemistry Homework Help

One cube is made of silver and has side length 82.0 cm and one cube is made of an unknown substance with side length 35.0 cm. The mass of the silver cube is 1.89 times larger than the mass of the unknown cube. The density of silver is 10.49 g/cm3; what is the density of unknown cube?

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)

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.

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

1. Using your knowledge of writing chemical formulas, write the formula for each of the reactants listed below. - Reaction A: propane reacting with oxygen gas - Reaction B: copper(II) sulfate reacting with iron - Reaction C: silver nitrate reacting with aqueous sodium chloride - Reaction D: magnesium reacting with oxygen gas - Reaction E: ammonium dichromate crystals heated - Reaction F: hydrochloric acid reacting with zinc - Reaction G: hydrogen gas and oxygen gas

5. Use the data table below to record info about the results of your investigation. Data should include info about the reactants, products, & signs of chemical changes. Be sure to note the form of the reactants and products. Use (s) for solid, (l) for liquid, (aq) for solution, and (g) for gas.

5. Given the following reaction: C6H12O6 + 0₂--> CO₂ + H₂O a. Balance the equation b. Determine the number of grams of water produced when 1.68 g of C6H12O6 (glucose) is oxidized.

2. . Write a one-paragraph summary of the research you did about reactivity series in the space below. The paragraph should answer the questions about activity series that you researched.

4. Propane, C3H8, when used as a fuel, reacts with oxygen to produce carbon dioxide and water according to the following equation: C3H8 +0₂--> CO₂ + H₂O a. Balance the equation b. How many grams of oxygen (O₂) will be needed to produce 5.67 moles of CO₂ ?