Determination of Phosphorus Content of Fertilizer: Skill Building Lab © 2011‚ Sharmaine S. Cady East Stroudsburg University Gravimetric Analysis Skills to build: Using vacuum filtration Using a digital balance Using mass stoichiometry Doing a gravimetric analysis Fertilizer Scientists estimate that the earth ’s soil contains less than twenty percent of the necessary organic nutrients needed to meet our current food production. Carbon‚ hydrogen‚ and oxygen used to synthesize
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1. “The energy for life comes from the sun.” Outline the role of the photosynthesis process to explain what is meant by this statement. (3 marks) chlorophyll 6CO2(g) + 6H2O(l) + energy C6 H12 O6 (aq) + 6O2(g) 2830 kJ glucose Photosynthesis is the process in which plants use the sun’s light energy to convert carbon dioxide and water into carbohydrates such as glucose‚ sucrose‚ starch and cellulose. Carbohydrates are high energy
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Chemical Formula Principles Chemical Formula is a system of chemical notation that was invented in 181 by John Jakob Berzelius. The system is based on the law of definite proportions”‚ states that all samples of a given chemical compound have the same elemental composition. It is also a way of expressing information about the proportions of atoms that constitute a particular chemical compound‚ using a single line of chemical element symbols‚ numbers‚ and sometimes also other symbols‚ such as
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Naming Chemical Compounds General Information: Scientists all around the globe use a standard method for naming chemical compounds. The standards were set up by an international committee sponsored by the International Union of Pure and Applied Chemistry (IUPAC). Having this standard makes life easier for people who use these compounds everyday. It would be tough to set up any experiment if scientists everywhere used different names for the same compound. It would also make the lab a
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ENVS 1000 – ENVIRONMENTAL SCIENCE MIDTERM TEST QUESTION BOOKLET Instructor: Mary Olaveson VERSION Complete the following information: Name: INDICATE VERSION ON YOUR SCANTRON PRACTICE MIDTERM TEST Student #: ANSWER KEY Important Information – CRN: # __________ Please Read Before You Begin Your Test DO NOT REMOVE STAPLES FROM TEST QUESTION BOOKLET RETURN TEST QUESTION BOOKLET with SCANTRON at end of TEST Before you begin the Test: 1. Record your NAME and STUDENT # on the Scantron Sheet
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Biology 1. If an interphase cell is treated with cyanide (a metabolic poison)‚ the cell does not divide by mitosis. However‚ if cyanide is added right after mitosis has started‚ the same cell completes mitosis. Which of the following explains this observation? A. Metabolic activity ceases during mitosis B. Cell division does not require metabolic activity C. Energy required for mitosis is produced and stored in the cell during interphase D. Mitotic cells make factors that make them resistant to
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denitrification. In the next 2 hours of aeration‚ ammonium was oxidized faster than COD and reached 89%. This was a result of the increase in DO concentration that exceeded 6 mg/L. The increase in DO made the oxidation of NH4-N unlimited. The first-order kinetic constants were 0.34 h-1 and 0.24 h-1 (Table 6)‚ with correlation coefficients of 0.94 and
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positively-charged or negatively-charged particle. Sodium Chloride‚ NaCl: Na+‚ ClOccur when particles of a substance‚ move in between the particles of another substance. Occur most rapidly in gases‚ slower in liquids and slowest in solids. 8. The Kinetic Theory of Matter i. Solid a solid has a fixed volume and shape a solid cannot be compressed the particles are packed closely together in an orderly manner there are strong forces between the particles the particles can only vibrate and rotate about
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5) e- = 10 B) Ne C) Mg2+ D) Si E) Mg 6) Which of the following statements about energy is TRUE? A) Energy is the capacity to do work. B) Kinetic energy is the energy associated with its position or composition. C) Energy can not be converted from one type to another. D) Systems tend to change in order to lower their kinetic energy. E) The total energy of a system does not remain constant. 6) 7) A covalent bond is best described as A) the sharing of electrons between atoms
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of chlorine gas‚ Cl2‚ is 70.9 g/mol‚ what mass of chlorine gas contains 0.652 moles of chlorine gas? Question 5 options: 109 g 92.4 g 46.2 g 23.1 g 9.20 g Save Question 6 (2.7 points) What is the molar mass of dinitrogen pentoxide? Question 6 options: 108 g/mol 30 g/mol 150 g/mol 94 g/mol 44 g/mol Save Question 7 (2.7 points) How many nitrogen atoms are present in 3.00 × 10–3 moles of nitrogen gas‚ N2? Question 7 options: 1.81 × 1019 3
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