Phase Change Lab Ha Min Noh Ms. D Chemistry February 6‚ 2016 Question How does time relate to the change in temperature of H2O as it changes phases from ice to water to gas? Hypothesis If the time which H2O stays on the hot plate increases‚ then the temperature of H2O will increase and the phases from ice to water to gas will change because the heat is a source of energy to change the physical states. Background Ice is a solid form of H2O and water is a liquid form of H2O. The gas form of H2O
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Physical Beauty vs. Inner Beauty Physical Beauty vs. Inner Beauty There are many definitions for “beauty” but each individual changes throughout life based on what they perceive. The two major types of beauty are physical (or outer) and Inner beauty. Based on the facts and research on these two topics; I would like to show the similarities and differences in the way individuals may perceive one other. What is the first thing that catches your eye‚ from the opposite sex? The first thing I see
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can quickly change between the different forms of H2O by either increasing or decreasing temperature. We have worked with hot plates and thermometers in other labs before‚ so we know how to be safe. I wonder what a graph of the changing temperatures over time between the phases would look like. Hypothesis Based on prior learning‚ I predict that the graph of the water phase changes will not be one straight slope‚ but instead will plateau‚ or be flat‚ and then slope between the change of ice to
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Alloy - An alloy is a substance made by melting two or more elements together‚ at least one of them a metal. An Example: Examples of alloys include brass‚ bronze‚ 14k gold‚ and sterling silver. covalent bond - A covalent bond is a chemical link between two atoms in which electrons are shared between them. An Example: There is covalent between the oxygen and each hydrogen in (H 2 O). Each of the bonds contains two electrons - one from a hydrogen atom and one from the oxygen atom. Both atoms
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Chemical Control Chemical pesticides are substances that are manufactured in laboratories that‚ when applied to crops‚ reduce the vitality of pest populations while leaving crops unharmed. There are many chemicals available to help eradicate common pests in a number of ways. Chemical controls can kill pests that come in contact with the chemical (toxicants)‚ eliminate the reproductive potential of pests (sterilants)‚ disrupt their developmental potential (growth regulators) or influence their behaviour
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1. Ozone (O3) in the atmosphere can react with nitric oxide (NO): O3(g) + NO(g) ( NO2(g) + O2(g)‚ with (H( = -199 kJ/mol‚ (S( = -4.1 J/K·mol. Calculate the (G( for this reaction at 25(C. A. 1020 kJ/mol B. -1.22 ( 103 kJ/mol C. 2.00 ( 103 kJ/mol D. -1.42 ( 103 kJ/mol E. -198 kJ/mol 2. For the reaction H2(g) + S(s) ( H2S(g)‚ (H( = -20.2 kJ/mol and (S( = +43.1 J/K·mol. Which of these statements is true? A. The reaction is only spontaneous
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Physical Anthropology Vs. Cultural Anthropology Abstract Anthropology as a whole plays a major role in the study of human and non-human evolution. Today we will be reviewing physical anthropology and cultural anthropology‚ and how both of these fields factor into the study of evolution. Phys. Anth. Vs. Cul. Anth.‚ 2 The questions pondered most about evolution by anthropologists are
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“Climate Change Over Time” I. Introduction a. In this lab‚ the question being investigated is‚ “Has climate changed over time?” b. The hypothesis is‚ “If CO2 levels affect climate‚ then the climate has changed overtime because of the increased greenhouse effect caused by higher levels of CO2 emissions.” c. Variables: 1. Independent Variable: Amount of CO2 2. Dependent Variable: Climate change II. Background Information Climate is the weather pattern in an area over long period of
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Department of Chemistry Physical and Chemical Properties Submitted by Date Submitted: February 2‚ 2014 Date Performed: January 31‚ 2014 Lab Section: Chem-180 Course Instructor: Professor Spenser Purpose The purpose of this lab experiment is to observe physical and chemical properties of substances
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Unit 1 Lab 1 Data on Fixed Line vs. Cellular Debate June 16‚ 2014 Debate the Pros and Cons to having a purely cellular network vs. having a purely fixed line network Pro ’s: Cost: Most wireline phone companies charge more than what you ’d pay for most alternatives‚ and some are taxed more as well. There are some locations where getting new wired phoneservice is prohibitively expensive or even impossible. Long Distance and extra features like Call Waiting are normally included with alternative
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