16-3 Red Cabbage Juice pH Indicator Sources: Prof. George Ewing’s C100 Demonstration Notes; Prof. Carolyn Huffman’s Fall ’93 C100 lecture; B. Z. Shakhashiri‚ 1989‚ Chemical Demonstrations: A Handbook for Teachers of Chemistry‚ vol. 3‚ pp 162-166. Description and Concept: Red cabbage juice will change to a variety of colors when added to solutions of various pH. Red cabbage juice is a pH indicator. Materials: red cabbage* blender hot or boiling water filter paper (coffee filters
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or irritation also may cause severe skin burns and eye damage‚ very flammable keep away from heat‚ sparks‚ open flames‚ and hot surfaces. Magnesium Nitrate may cause skin and serious eye damage‚ corrosion or irritation also it is very flammable. Calcium Nitrate Is very reactive and a oxidizer‚ It will also irritate any contact point. Barium Nitrate and Strontium Nitrate also have similar affects to exposed skin and they are also oxidizers. III. Pre-Lab Questions- What are the group 1 elements called
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cells as easily accessed energy. It is possible to detect respiration with the substance calcium hydroxide which absorbs carbon dioxide in the air and converts it to solid calcium carbonate. The experimental setup will be to put several seeds in a test tube that contains calcium hydroxide and then to place the test tubes upside down in a beaker of water so that no new air can enter the test tube. The calcium hydroxide will react with any carbon dioxide that is produced and remove the gas from the
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into the Little Colorado River. Accordingly‚ I transformed into a carbonate ion rather than staying as carbon dioxide. My freedom in the atmosphere done with‚ I now resided in the hydrosphere‚ the seventh stop. While in the hydrosphere‚ I moved from the Little Colorado River to Lake Powell. Twenty four years I spent as a carbonate ion in Lake Powell. Nevertheless‚ that ended with me going into a snail’s shell as calcium carbonate. The snail then died and layers of sedimentary rock buried it. The
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18. In a sample of solid calcium phosphate Ca3(PO4)2‚ the ratio of calcium ions to phosphate ions is - 3:2 19. What is the total number of atoms in (NH4)2SO4? - 15 20. What is the total number of oxygen atoms present in one unit of Mg(ClO3)2? - 6 21. What is the total number of atoms of oxygen in the formula Al(ClO3)3.6H2O? - 15 22. Write the correct formulas for the following binary ionic compounds. Compounds | Formulas | Lithium fluoride | LiF | Calcium oxide | CaO | Aluminum nitride
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ions in compound Sodium chloride Na+ : Cl1:1 Magnesium oxide Formula of compound Covalent MgO Ca2+: Cl1:2 CaCl2 Metallic Fill in this table of more complicated ions: Name of ion Formula of ion Calcium hydroxide‚ Ca(OH)2 hydroxide NO3CO32Suphate Example of compound Mg(NO3)2 Sodium carbonate CaSO4 KEY WORDS: Electronic structure Covalent bonding Ionic bonding Proton Electron Ion Giant structure (lattice) Metallic bonding ASSESSMENT: C2 REVISION – CHAPTER 2 – STRUCTURE & PROPERTIES IONIC
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OCEAN ACIDIFICATION The world’s oceans have largely been left out of the mainstream discussion of global climate change. Yet‚ as one of the largest natural reservoirs of carbon‚ the surface ocean plays a critical role in the global carbon cycle. Over recent years‚ human activities such as the burning of fossil fuels have increased the amount of carbon dioxide gas emitted to the atmosphere and the amount that dissolves into the ocean. Over the last decade‚ scientists have discovered that this excess
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three ionic solid species Compound Formular Characterization Molecular Weight (g/mol) Calcium chloride CaCl2 Calcium chloride is an ionic salt‚ and metal halide. It is white crystalline solid at room temperature‚ with high solubility to water (Pubchem). CaCl2 used for this experiment were in beads form of approximately 10 mesh. 110.978 Sodium carbonate Na2CO3 Sodium carbonate is a sodium salt‚ and metal carbonate‚ that is water-soluble. It most commonly occurs as white hygroscopic powder (Pubchem)
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concentrations of CO2 • Therefore a pH of less than 5.6 has sometimes been used as a definition of acid rain The Effects: • increases the acidity of the soil‚ and affects the chemical balance of lakes and streams • accelerates weathering in carbonate rocks and accelerates building weathering • contributes to acidification of rivers‚ streams‚ and forest damage at high elevations • When the acid builds up in rivers and streams it can kill fish Problems: • large fraction of which are formed
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SEMESTER- I PRACTICAL- I VOLUMETRIC ANALYSIS The method to determine the exact amount of the substance in a given sample is termed as quantitative analysis volumetric analysis is a branch of quantitative analysis involving accurate measurement of volumes of reacting solutions. The volumetric analysis is very much in use due to simplicity rapidity accuracy and wide applicability. The reacting substances are taken in the form of solutions and made to react. The concentration of one solution is
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