In the book "Silent Spring" by Rachel Carson‚ Rachel describes the damage of pesticides on the environment which had not yet been well known because of the hidden truth. Officials have either denied or prevented speaking about the harm of dangerous chemicals even though humans were negatively affected by it. This quote references the ideal expectation of a civilization because it generates the idea that a civilization can only be classified as one‚ as long as they avoid destruction. The occurrence
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Calorimetry 1. How many calories would it take to raise the temperature of 200 g of water 100oC? 2. It takes 23.5 J to raise the temperature of 10.0 g of silver by 10oC. What is the specific heat of silver? 3. A 255 g quantity of gold is heated from 28oC to 100oC. How many joules of energy were used? (specific heat of gold = 0.13 J/goC) 4. What will be the final temperature of 5.00 g of silver at 37oC if it gives off 25.0 J of heat to the surroundings
Free Thermodynamics Energy Enthalpy
calculate the number of moles of each reactant. 3. To predict which reactant is in excess. 4. To use drawings to relate microscopic events‚ to write a chemical equation that represent those microscopic events. 5. To learn how to measure the volume of a liquid using a buret. Prelab Questions: 1. Calculate the number of moles in 2.65g of zinc. 2. Calculate the number of moles of hydrochloric acid in 37.5mL of a 3.00M HCl solution. 3. Calculate how many moles of HCl are required
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SPECIFIC type of atom. When atoms combine they form MOLECULES. -Macro is big. Micro is small. -Chemistry is a central science which means that it can be incorporated in many different types of fields. Classification of Matter -There are 3 main states of matter: solid‚ liquid‚ gas. Solid- definite shape and volume Liquid- definite volume no shape Gas- No nothing -A substance with fixed proportions are called PURE SUBSTANCE. The two types of pure substances are element and compound
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equation for the reaction: Ca(OH)2 (aq) + HNO3 (aq) → Ca(NO3)2 (s) + H2O (ℓ) is balanced? 1‚ 4‚ 2‚ 4 1‚ 2‚ 1‚ 2 1‚ 1‚ 1‚ 2 None of the above 2 - The mass in grams of two moles of iron atoms is: 26.00 g 55.847 g 111.69 g 27.923 g 3 - The formula mass of nitric acid is given by: 31.50 g/mol 17.03 g/mol 63.01 g/mol 126.02 g/mol 4 - Sodium oxide has the formula: Na2O Na2O2 NaO2 Na4O2 5 - The correct name for (NH4)2SO4 is: Ammonium bisulfate Ammonium hydrogen sulfate
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Arab Spring The Arab spring is taken place parts of North Africa and in the Middle East. It is the result of many people who are tired of being ruled by under a dictatorship. The uprising has affects on other countries. Such as‚ Libya‚ Egypt‚ and Syria‚ who have faced dilemmas. Many of their people have been arrested‚ severely injured‚ and even killed. Arab spring is a good cause because people are standing up for what they believe in and it has effects on the United States‚ due to oil companies
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Surname: Professor: Year: Subject: “THE ARAB SPRING” The term “Arab spring” is a connotation used by both Khalidi and Rozenman in their articles in reference to the Arabs’ protests for democracy overtime. The articles are a response to the mass action taken by various Arabs worldwide after the throw of despondent rulers such as Egypt’s Hosni Mubarak‚ Yemen’s Ali Abdullah Saleh and Libya’s Muammar Ghadafi. The two articles attempt to delve deep into the consequences of such historical actions‚ drawing
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phone lines to connect to the network. Slow and can tie up your phone line while you are online. DSL: uses telephone lines to carry digital signals. Faster than ordinary telephone lines. Slower than cable and cheaper than cable. Problem: must be within 3 miles of the DSL service provider’s facilities. The further the slower. Broadband: faster! 200kbps but more expensive Cable: offered by cable TV provider and uses the same wires to carry both signals. Faster than DSL and broadband. Problem: share cable
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________. A) chemical B) solid C) wave D) electric charge E) element Answer: A 2) In this list‚ which substance can be classified as a chemical? A) salt B) sleep C) cold D) heat E) temperature Answer: A 3) One example of a chemical used in toothpaste is ________. A) chlorine B) sulfur C) carbon dioxide D) calcium carbonate E) sugar Answer: D 4) Which of the following is not a chemical? A) salt B) water C) light D) carbon
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Midterm Exam – October 17‚ 2012 SOLUTIONS Instructions: 1. Read the questions carefully. 2. Answer all questions on the following pages. 3. A financial calculator and a regular calculator are permitted. 4. A one-sided 8.5” x 11” formula sheet is permitted with formulas only. 5. The midterm has 11 pages‚ including 2 blank pages. 6. For Part 2‚ show all your work. 7. Midterm duration: 75 minutes. 8. Mark allocation: Shown on exam. Print your name: _________________________________________ Sign your
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