Written Assignment 2: Atomic Structure and Chemical Compounds Answer all assigned questions and problems, and show all work. 1. What is the mass number of an iron atom that has 28 neutrons? (3 points) (Reference: Chang 2.13) 2. Calculate the number of neutrons of 239Pu. (3 points) (Reference: Chang 2.14) 3. Write the appropriate […]
Written Assignment 7: Energy and ThermochemistryAnswer all assigned questions and problems, and show all work. 1. Consider this reaction: 2CH3OH(l) + 3O2(g) → 4H2O(l) + 2CO2(g) ∆H = –1452.8 kJ/mol a. Is this reaction endothermic or exothermic? (2 points)b. What is the value of ∆H if the equation is multiplied throughout by 2? (2 […]
IT IS IMPORTANT TO CLARIFY THAT THIS IS A GRADE EQUIVALENT TO AN EXAM AND THEREFORE THEY HAVE TO DO A WORK OF THE QUALITY OF A GRADUATE STUDENT. FOR THIS I WILL GIVE YOU SOME GUIDELINES THAT WILL HELP YOU DO THIS WORK AS COMPLETE AS POSSIBLE: 1.State briefly the purpose of the biochemical […]
Instructions Part 1: In this assignment you will first identify your selection. Give the history of the person, his/her research that won them the Nobel Peace Prize. Also, share the process as to how the winner is chosen. Finally, state why you selected this person in your assignment. You may use the “Online Librarian” to […]
Written Assignment 4: Chemical Reactions Answer all assigned questions and problems, and show all work. 1. Write the (a) balanced equation for the formation of liquid water from hydrogen and oxygen gas, and use it to explain the following terms: (b) chemical reaction, (c) reactant, (d) product. (12 points) 2. Balance the following equations: (18 […]
Written Assignment 3: Mass Relationships for Compounds Answer all assigned questions and problems, and show all work. 1. How many atoms are there in 5.10 moles of sulfur (S)? (6 points)(Reference: Chang 3.13) 2. How many moles of calcium (Ca) atoms are there in 77.4 g of Ca? (6 points) (Reference: Chang 3.15) 3. What […]
Written Assignment 2: Atomic Structure and Chemical Compounds Answer all assigned questions and problems, and show all work. 1. What is the mass number of an iron atom that has 28 neutrons? (3 points) (Reference: Chang 2.13) 2. Calculate the number of neutrons of 239Pu. (3 points) (Reference: Chang 2.14) 3. Write the appropriate […]
Written Assignment 1: Introduction and Measurement Answer all assigned questions and problems, and show all work. 1. Do the following statements describe chemical or physical properties? (10 points) a) Oxygen gas supports combustion. b) Fertilizers help to increase agricultural production c) Water boils below 100°C on top of a mountain d) Lead is denser […]
Written Assignment 6: Gases Answer all assigned questions and problems, and show all work. 1. A gas occupying a volume of 725 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?(5 points) (Reference: Chang 5.19) 2. The volume […]
Written Assignment 4: Chemical Reactions Answer all assigned questions and problems, and show all work. 1. Write the (a) balanced equation for the formation of liquid water from hydrogen and oxygen gas, and use it to explain the following terms: (b) chemical reaction, (c) reactant, (d) product. (12 points) 2. Balance the following equations: (18 […]
