which of the following changes: a. Wavelength. b. Frequency. (Each question carrys 2 marks) 11. An element E has following electronic configuration:K L M 2 8 6 a. To which group of the periodic table does element E belong? b. To which period of the periodic table does element E belong? c. State the number of valence electrons present in element E. d. State the valency of the element E. 12. What is Pollination? Describe Cross Pollination. 13. The organisms formed by asexual reproduction
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Minerals are elements that originate in the Earth and cannot be made by living organisms. They are natural compounds formed through geological processes and are what remains as ash when plant or animal tissue is burned or decompose completely after death. Minerals are inorganic substances which means they are not formed by living matter and contain no carbon‚ and can be simply defined as chemical molecules which cannot be reduced to simpler substances. To be classified as a "true" mineral‚ a substance
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oxidized in air at about 933 K (660 °C‚ 1220 °F) [1]. This paper will discuss the effects of Vanadium on the environment and Vanadium’s properties. Chemical Properties: Vanadium is a transitional metal. Its atomic number is 23 and its atomic mass is 50.9415 Vanadium’s family group is 5 and its period is 4. Vanadium is a moderately reactive element. It does not dissolve when put in water and it doesn’t react to oxygen at room temperature. Vanadium also doesn’t react with hydrochloric or cold sulfuric
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Data Tables: Part 1: Chemicals Well No. Observations of the Reaction A. NaHCO3 + HCl A1 Bubbles immediately formed and started popping (not rapidly). This could be seen more easily with the black paper underneath the well plate B. HCl + BTB C1 Once I added the Bromothymol Blue indicator‚ it turned an orange-like color C. NH3 + BTB E1 The reaction turned dark blue. When Bromothymol Blue reacts with an acid‚ it turned orange‚ and when it reacts with a base‚ the end result is blue. D. HCl
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THEORY Part A: HISTORY * 1869: Mendeleev formulated the Table of the Elements - listing them by their atomic weight and grouping them with similar characteristics. * 1897: JJ Thomson discovered electron and isotopes‚ and invented the mass spectrometer. * 1898: Marie Curie discovered and isolated radium‚ a new element which unprompted disintegrated into other elements. This proved that the atoms of one element at least were not indivisible. * 1911: Ernest Rutherford established that
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Smell”? - Bromine There are 118 known elements to man‚ and each of them differ in its own way. They vary from weight‚ structure‚ color‚ and much more‚ but many of them are similar to others and can be grouped accordingly. One element that varies drastically from others is one whose stench is so horrible‚ that the original name of the element was changed from muride to bromos‚ which means “stench” in Greek. Thus‚ bromine was named. Like many other known elements‚ bromine was discovered by two chemists
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time‚ he could not elaborate on his suggestion. That’s where John Dalton came in…..2000 years later. Dalton used experimental methods to changed Democritus’s idea into a scientific theory. Dalton then began analyzing the ratios in which elements merge in chemical reactions. After doing several experiment‚ Dalton’s atomic theory was created. The four parts of his theory – as seen on page 103 in your Pearson Chemistry textbook - can be found
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Data Tables: Part 1: |Chemicals|Well No.|Observations of the Reaction| A.|NaHCO3 + HCl||Bubbling in center of droplets. Homogeneous| B.|HCl + BTB||Turns yellow immediately after contact. Homogeneous| C.|NH3 + BTB||Turned dark blue. Homogeneous| D.|HCl + blue dye||Solution turns green immediately after contact. Homogeneous| E.|Blue dye + NaOCl||Stays blue. Homogeneous| | with the 1 drop of HCl||Mixes and turns a bluish green color. Homogeneous| F.|NaOCl + KI||Slightly yellowish tint to the
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Beryllium Beryllium is a stolid and atomic number 4. Beryllium atomic mass is 9.012182. Beryllium electrons pre shell are 1‚ 2. Beryllium is a chemical element with the symbol of Be. Beryllium was discovered by Louis Nicolas Vauquelin in 1797. Beryllium metal point is 2‚348 F. Beryllium is a steel gray and hard metal that is brittle. The discovery of beryllium was Louis Nicolas Vauquelin. Louis discovered beryllium in 1797. The place beryllium was discovered was in France. The metal was isolated
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What are the major components of an atom? Proton‚ Electron and Neutron 2) Which Subatomic particle is most important to biological systems? The most important subatomic particle to biological systems is 3) Be able to indentify various Chemicals bonds. 4) How does polarity of water make it an excellent solvent? The polarity of water is caused by the electro negativity of the oxygen atom‚ so electron density is drawn towards it from the hydrogen’s thus leaving a permanent dipole
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