SUMMARY FOR GRADE 7 FIRST SEMESTER Importance of Chemistry Chemistry is an important branch of science. Chemistry deals with the matter that form our environment and the transformation that the matter undergoes. Chemistry is therefore‚ useful in understanding the changes taking place in the constituents of the environment and the resulting advantages. Chemistry is connected with composition‚ structure and properties of the matter. In fact it is a science of atoms and molecules. Organic chemistry
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Nervous System- Nerve Impulse When a stimulus is strong enough‚ a nerve impulse is generated in an "all or none" response which means that a stimulus strong enough to generate a nerve impulse has been given. The stimulus triggers chemical and electrical changes in the neuron. Before an impulse is received‚ a resting neuron is polarized with different charges on either side of the cell membrane. The exterior of the cell is positively charged with a larger number of sodium ions present compared
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From the experimental data and through its analysis‚ the enthalpy of combustion for the five alcohols were determined; methanol‚ ethanol‚ propanol‚ butanol‚ and pentanol. As the line of best fit in the graph suggests‚ the enthalpy of combustion increased as the sizes of the molecules increased. This was predicted in the hypothesis and proves it to be correct. As seen on the graph‚ the enthalpy of combustion increases from 140kJ/mol for methanol‚ which has the smallest molecular mass‚ to 530kJ/mol
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contains sensory nerve endings‚ blood and lymph vessels‚ sebaceous and sweat glands. Under this layer is the Subcutaneous fat layer‚ this layer separates the skin from the underlying bone and muscle with a rich blood supply it also serves as an insulator and energy store. Pressure ulcers develop when a large amount of pressure is applied to an area of skin over a short period of time. Or‚ they can occur when less force is applied but over a longer period of time. The extra pressure disrupts the
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GUIDELINES FOR PREPARING THE CIVIL COST ESTIMATE OF TRANSMISSION SYSTEM PROJECT The following shall be considered while preparing the cost estimate of Transmission System Project: 1. General Layout of Transmission System Project: The following drawings shall be provided with the civil cost estimate of the Transmission System Project: (a) The single line diagram of the Transmission Lines plotted on the map of India showing the different wind zones through which the Line is passing.
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I am writing to inform you of a recent economic opportunity that could leave you rich if you choose to invest. The prospect of wealth relies on superconductors- the system of the future and present. You could earn millions by contributing to the research of superconductors. Superconductors consist of an element‚ inter-metallic alloy‚ or compound that will conduct electricity without resistance (loss of energy flowing through the material) below a certain temperature. Once in motion‚ electrical
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Introduction to Microelectronic Fabrication Lecture 1 January 11th‚ 2006 Brief overview of microelectronic fabrication •Dominant material: Silicon •Technology size •MOSFET fabrication •Safety Dominant material: Silicon Obtaining ultrapure Si (other technology) Robert F. Pierret‚ Semiconductor Device Fundamentals‚ p.17 Single-crystal formation • Bridgmann method • Czochralski method USNA (lecture notes)‚ http://www.usna.edu/EE/ee452/LectureNotes/05-Processing_Technology/15
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just wore whatever their regular cloths were. Many men were seen wearing wool shirts and pants‚ which seem like‚ would be a very uncomfortable outfit to be running around in. The wool and long pants did not allow air to flow. The wool acted as an insulator and kept players hot and uncomfortable. A few years into the making of basketball college
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Aim: To investigate the difference between the melting point of dark and milk chocolate. Hypothesis: If both chocolate is heated then dark chocolate will melt faster because milk chocolate has more fats Variables (i) Independent: Two substances will be tested dark chocolate and milk chocolate. (ii) Dependent: The temperature at which each substance melts
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Polyester Manufacturing Polyester fibers‚ the synthetic fibers‚ are long chain polymers derived from coal‚ air‚ water‚ and petroleum. They are formed through chemical reaction between an acid and alcohol. In this reaction‚ two or more molecules combine to make a large molecule whose structure repeats throughout its length. These molecules are very stable and strong. There are variations in the compositions and therefore in the properties of polyester fibers. Types of Polyester The polyester
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