Biochemistry Exam I Terminology Boiling point is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid. At this temperature the liquid phase changes into the gaseous phase (also a colligative property) Melting point is the temperature at which the solid and liquid phases are in equilibrium. At this temperature the solid state changes into a liquid phase (also a colligative property) Specific heat is the amount of energy (in joules or calories) needed
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Universe and Inverse are closely related‚ for the effects of known forces of universe are inverse in nature. Ever since Newton made a bold proposition that there is a force of attraction amongst the planets of planetary system‚ amongst different planetary systems and amongst the different galaxies and varies as Inverse Square of their distances‚ people began to correlate every activities of nature and predict its effect accurately. 1. Kepler’s laws Tycho Brahe’s largest and most accurate collections
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an idea to cut down on plastic bag usage in Singapore by imposing charges for them on people patronising supermarkets‚ provision shops and even food outlets and hawker stalls. The proposal deals with one of Singapore’s significant source of waste and it can be seen as a small move towards eco-friendliness. As with any other new initiatives‚ it is worth discussing its potential effectiveness‚ and any other impacts that the charges on plastic bags may have on the society. On the same note‚ examining
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circuits. Definition of Electricity and Electrical Charge According to the Concise Oxford English Dictionary‚ revised 10th edition‚ the first definition of electricity is a form of energy resulting from the existence of charged particles (such as electrons or protons)‚ either statically as an accumulation of charge or dynamically as a current. Thus‚ to describe electricity we must introduce the idea of positive and negative electrical charge‚ which is stored energy associated with particles –
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| Two small spheres‚ each with mass m = 3.0 g and charge q‚ are suspended from a point by threads of length L = 0.22 m. What is the charge on each sphere if the threads make an angle = 15º with the vertical? | | A) 0.79 C B) 2.9 C C) 75 mC D) 6.3 C E) 0.11 C | | | | Three charges‚ each of Q = 3.2 10–19 C‚ are arranged at three of the corners of a 20-nm square as shown. The magnitude of the electric field at D‚ the fourth corner of the square‚ is approximately
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Electricity The electric flux out of any closed surface is proportional to the total charge enclosed within the surface. The integral form of Gauss’ Law finds application in calculating electric fields around charged objects. In applying Gauss’ law to the electric field of a point charge‚ one can show that it is consistent with Coulomb’s law. While the area integral of the electric field gives a measure of the net charge enclosed‚ the divergence of the electric field gives a measure of the density
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or Electrostatics David Case: March 6‚ 2015 Experiment #8 Static Electricity or Electrostatics Objective: To explore the concepts of static electricity and to discover how many types of electrical charges exist and how they interact with each other Materials: 1 Scrap of white paper 1 Transparent tape 1 Aluminum Foil - 6"x 6" 2 Cup‚ Styrofoam‚ 8 oz 1 Dark paper - 1/2 Sheet 1 Ruler‚ Metric 1 Fabric Swatch-5
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Heat: a form of energy Heat In physics and chemistry‚ heat is energy transferred from one body to another by thermal interactions.[1][2] The transfer of energy can occur in a variety of ways‚ among them conduction‚[3] radiation‚[4] and convection. Heat is not a property of a system or body‚ but instead is always associated with a process of some kind‚ and is synonymous with heat flow and heat transfer. Heat flow from hotter to colder systems occurs spontaneously‚ and is always accompanied by an
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fluoride LiF Lithium oxide Li2O When naming binary compounds follow these rules: 1. the element with the positive ionic charge is written first. 2. The second word is formed by changing the ending of the name of the element to “ide.” For example‚ bromine changes to bromide. Metals usually have positive charges while nonmetals (when combined with nonmetals) have negative charges. Practice Problems Using the rules given above‚ name the compounds listed in the next column. 1. MgO ____________________
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wondering how they are related. It’s not obvious at first but as you go deeper‚ you will realize that these two things are somehow related with each other. In Physics‚ the electric field from a positive charge points away from the charge; the electric field from a negative charge points toward the charge. The opposite happens in Psychology. In the study of Proxemics (personal space)‚ there is a decrease in the personal space requirement if other people find you as a positive person. On the other hand
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