In the pasted years population has been growing rapidly in MEDC’s and LEDC’s‚ by looking at the crude birth rate and crude death rate we are able to see how the population grows in certain countries. Looking at how high the rates are in a LEDC country and a MEDC country‚ you are able to conclude that you can relate specific factors to different areas of the world. When looking at the population growth of a LEDC there are common factors that appear when looking at the death and birth rates. For
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agent or sulficant is concentrated sulfuric acid but‚ sulfurtrioxide‚ chlorosulfonic acid‚ metallic sulfates‚ and sulfamic acid are also occasionally used. The name sulficants comes from these molecules moving to the surface of a liquid or to an interface between two liquids and changing the properties of the surface. However‚ the nature and properties of sulfuric acid‚ makes it desirable to use it for nucleophilic substitutions whenever possible. For each substance being suflinated‚ there is a critical
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INTRODUCTION A mixture can simply be defined as a substance that is made up or consists of two or more elements and/or compounds that are physically combined but that have not reacted chemically to form new substances. A mixture may be a solid‚ liquid‚ gas‚ or some combination of those states. Mixtures can be found almost every wher in our everyday lifes and some common examples are * sand and water * salt and water * sugar and salt * Due to the fact that mixture are not chemically
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lowers the market value to ensure proper popping‚ the density also plays a part in the popping that should occur. Purpose: To perform the quality control tests and competitive analysis in the popcorn industry‚ and see if the kernels meet industry standards. Part A: Measurement of Density Procedures: Weigh 10 kernels of unpopped popcorn. Find the volume of those kernels using water displacement in a 10-ml graduated cylinder. Calculate density of sample(D=M/V). Repeat 3 times using new a new
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liquefaction (condensation) of a gas‚ which is the result of a number of molecules being pressed together to produce forces of attraction high enough to give a liquid structure. Cohesion in liquids is reflected in the surface tension caused by the unbalanced inward pull on the surface molecules‚ and also in the transformation of a liquid into a solid state when the molecules are brought sufficiently close together. Cohesion in solids depends on the pattern of distribution of atoms‚ molecules‚ and
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viscosity of a mixture of liquid Research Question The effect of hydrogen bonding on resisting flow of five different liquids Background Theory Viscosity is the resistance of a fluid to flow‚ either within itself‚ or to moving past an objects moving through it. A liquid with high viscosity is thick and flows slowly. A liquid with a low viscosity is thin and flows quickly. Different liquids have different viscosities. Factors‚ which affect viscosity of a liquid‚ are: Size of a molecule:
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Heidi Duncan 11/24/13 Exothermic and Endothermic Reactions Lab The purpose of this lab is to observe how heat is released or absorbed with different chemicals. Data Table 1 – HCI and NaOH Trial 1 Trial 2 Avg Volume 1.0 M HCI(ml) 25 25 - Volume1.0 M NaOH (ml) 25 25 - Ti of HCI before mixing 20 20 - Ti of NaOH before mixing( 20 20 - Average Ti before mixing( 20 20 - Tf of mixture ) 26 26 - T ) 6 6 - Specific Heat (J/g) 4.184 4.184 - Heat‚ q (J) 1255.2
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cooling at aircraft cabin and also to rremove heat from electrical and electronic equipment. Its work on principle of cooling based on ability of refrigent to absorb heat when changing from liquid to gas. Once it turns to gas all the latent heat of vaporization it is compressed and condensed back into its liquid state. In other way vapour cycle system his also help to reduced the humidity of the air entering the cabin while aircraft on the ground and as the temperature of the air is reduced the moisture
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force in surface tension is cohesion and gravity. Surface Tension is the condition existing at the free surface of a liquid‚ resembling the properties of an elastic skin under tension. The tension is the result of intermolecular forces exerting an unbalanced inward pull on the individual surface molecules; this is reflected in the considerable curvature at those edges where the liquid is in contact with the wall of a vessel. Because of this property‚ certain insects can stand on the surface of water
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covalent compounds? What is the reason for this difference in melting points? (3 points) 2. Do ionic compounds conduct electricity as: (3 points) a. Solids? b. Liquids? c. Aqueous solutions (when the ionic compounds are dissolved in water)? 3. Do covalent compounds conduct electricity as: (3 points) a. Solids? b. Liquids? c. Aqueous solutions (when the covalent compounds are dissolved in water)? Part II: Lab Insert completed data tables for each part of the lab. Be sure that the data
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