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 […]
You are to take a picture of your companies OSHA 300A form (Summary of Occupational Injuries and Illnesses). Companies are required to post this information from February 1st – April 30th each year. Then you are to calculate the total incident rate and the DART rate for your company to view the safety performance of […]
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 […]
DISCUSSION (Answer the following questions correctly and thoroughly using complete sentences.) 1. Did your solutions in Part I obey Beer’s Law? How do you know? 2. Compare and contrast the features of a primary color spectrum with those of a secondary color spectrum. 3. Without using a spectrometer or any other instrument, how could […]
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 […]
The DOT regulation at 49 CFR 174.450 previously stipulated that when fire occurs in a domestic rail shipment of charcoal in transit, water should not be used if it is practicable to locate and remove the burning charcoal. Any charcoal that becomes wet while a fire is being extinguished must be removed from the car […]
exercise 1: nomenclature practice Part 1: Ionic Compounds 1. Pb(SO4)2 – 2. Be(HCO3)2 – 3. Mn2(SO3)3 – 4. Al(CN)3 – 5. Mn(ClO3)2 – 6. Mg(ClO2)2 – 7. BaSO4 – 8. KI – 9. NaCl – 10. MgCl2- 11. Na3N – 12. CoCl2 – 13. Lithium bromide – 14. Lead (II) oxide – 15. Chromium […]
pre-lab questions 1. What is an electron configuration? 2. How is the light emitted by an atom related to its electron configuration? experiment 1 data sheet Table 2: Results of Firework Material Ignition Substance Observations Lithium chloride (LiCl) Sodium chloride (NaCl) Potassium chloride (KCl) Calcium chloride (CaCl2) Table 3: Electron Configuration […]
Allicin is the compound responsible for the characteristic smell of garlic. An analysis of the compound gives the following percent composition by mass: C: 44.4 percent; H: 6.21 percent; S: 39.5 percent; O: 9.86 percent. Calculate its empirical formula. What is its molecular formula given that its molar mass is about 486g?
