Science
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4,610 Essays on Science. Documents 3,061 - 3,090
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Phosphates and Dissolved Oxygen
Phosphates are present in many natural waters, such as lakes and streams. Phosphates are essential to aquatic plant growth, but too much phosphate can lead to the growth of algae and results in an algae bloom. Too much algae can cause a decrease in the amount in dissolved oxygen in the water. Oxygen in water is affected in many different ways by phosphates Phosphorus is usually present in natural waters as phosphate(Mcwelsh and Raintree,
Rating:Essay Length: 834 Words / 4 PagesSubmitted: December 15, 2009 -
Phosphates in Water Pollution
Phosphates may be created by substituting some or all of the hydrogen of a phosphoric acid by metals. Depending on the number of hydrogen atoms that are replaced, the resulting compound is described as a primary, secondary or tertiary phosphate. Primary and secondary phosphates contain hydrogen and are acid salts. Secondary and tertiary phosphates, with the exception of those of sodium, potassium and ammonium are insoluble in water. Tertiary sodium phosphate is valuable as
Rating:Essay Length: 880 Words / 4 PagesSubmitted: December 17, 2009 -
Phosphorous Nutrient Deficiency of Sunflowers, Helianthus Annuus
Phosphorous Nutrient Deficiency of Sunflowers, Helianthus annuus Ngoc Chau Tran Cal State Fullerton Abstract: The objective of this experiment was to determine whether or not a complete nutrient solution would have increased stem width, height, and leaf length compared to 25% phosphorous. My hypothesis was that sunflowers with a complete solution of nutrients would have the same growth compared to sunflowers with 25% phosphorous deficiency. The experiment was conducted by setting up two groups of
Rating:Essay Length: 1,973 Words / 8 PagesSubmitted: March 20, 2010 -
Phosphorus
Received a 96 on this paper. PHOSPHOROUS (A Greek word meaning Light Bearer) Many of the substances and gadgets discovered in the past were done so by accident. Phosphorus was no different. This substance came about in 1669 when a German physician named Hennig Brand boiled, filtered and processed many gallons of urine. As disgusting as this method was, he conducted the experiment in hopes to distill salt by evaporating urine! In the interim, he
Rating:Essay Length: 434 Words / 2 PagesSubmitted: April 9, 2010 -
Photochemical Smog
Historically, the term smog referred to a mixture of smoke and fog, hence the name smog. The industrial revolution has been the central cause for the increase in pollutants in the atmosphere over the last three centuries. Before 1950, the majority of this pollution was created from the burning of coal for energy generation, space heating, cooking, and transportation. Under the right conditions, the smoke and sulfur dioxide produced from the burning of coal
Rating:Essay Length: 1,607 Words / 7 PagesSubmitted: December 23, 2009 -
Photosynthesis
1A.) Translation is the synthesis of a polypeptide using genetic information which is encoded in an mRNA (messenger RNA) molecule. The information which is encoded changes from molecules to amino acids. It also lines codons and anticodons and eventually makes tRNA (transfer RNA). Messenger RNA turns into transfer RNA during translation. The basic concept of translation is that molecules of mRNA are moved through a ribosome and codons are translated into amino acids. Transfer RNA
Rating:Essay Length: 690 Words / 3 PagesSubmitted: November 20, 2009 -
Photosynthesis
Photosynthesis When you and me eat, we find our food. When plants eat, they make their own food and energy. They make their food and energy through a process called photosynthesis. Through photosynthesis oxygen is also produced. Photosynthesis is "a process in which green plants synthesize carbohydrates from carbon dioxide and water....The reverse of this reaction provides energy for plants, for animals that eat plants, for animals that eat animals that eat plants" for
Rating:Essay Length: 724 Words / 3 PagesSubmitted: November 22, 2009 -
Photosynthesis
Photosynthesis Investigation to find effects of distance of a light source from pond weed has on the amount of oxygen produced Photosynthesis All green plants need to be able to make their own food.They do this by a process called photosynthesis.For photosynthesis to occur they need sunlight energy.This energy is absorbed by a green pigment called chlorophyll,which is mainly found in the leaves.This energy then combinEs with water molecules (from the soil) and carbon dioxide
Rating:Essay Length: 885 Words / 4 PagesSubmitted: November 26, 2009 -
Photosynthesis
Abstract Photosynthesis is used to synthesize complex organic materials from carbon dioxide, water, and inorganic salts, using light as the source of energy. The purpose of this experiment was to measure the optimum wavelength and light intensity at which photosynthesis occurs. A buffer solution containing DCPIP was mixed and chloroplasts were added. Different wavelengths and light intensities were tested on the solutions, and a control was used to monitor for any change without light exposure.
Rating:Essay Length: 1,644 Words / 7 PagesSubmitted: January 30, 2010 -
Photosynthesis
Background Photosynthesis is the chemical process plants use to change energy in the form of sunlight into chemical energy in the form of sugar or other carbohydrates. The equation of this process is 6 CO2+ 6 H2O → C6H12O6+ 6 O2. Which is Carbon dioxide plus Water plus Light energy into Glucose plus Oxygen? For a plant to be able do the process of photosynthesis they need sunlight. In plants, photosynthesis usually happens in the
Rating:Essay Length: 1,099 Words / 5 PagesSubmitted: December 17, 2015 -
Photosynthesis and Respiration
All organisms on earth depend on photosynthesis, in which light energy is used to make sugar and other food molecules from carbon dioxide and water. For example, plants and other photo-synthesizers need only energy from sunlight, carbon dioxide from air, and water from the soil to make the sugar glucose. Photosynthesis is the most important chemical process on earth because it provides food for virtually all organisms, not only for photo-synthesizers but for the organisms
Rating:Essay Length: 1,875 Words / 8 PagesSubmitted: February 22, 2010 -
Photosynthesis Lab
Photosynthesis Lab Data Collection: The absorption of different wavelengths of light by Chlorophyll Wavelength (nm) Absorbance of light by chlorophyll (Arbitrary units) Diluted Calculation New Reading (Arbitrary units) Violet 430 2.35 50% 2.35 x 2 3.20 Blue 470 1.09 - - 1.09 Blue-Green 492 0.38 - - 0.38 Green 520 0.77 - - 0.77 Yellow-Green 550 0.85 - - 0.85 Yellow 580 1.43 - - 1.43 Orange 600 0.65 - - 0.65 Red 700 0.16
Rating:Essay Length: 680 Words / 3 PagesSubmitted: December 9, 2009 -
Photosynthesis Lab
Introduction To survive, all organisms need energy. Plants get most of their energy from photosynthesis. Plants are autotrophs, that generate their own chemical energy from the product of the sun through photosynthesis. The chemical energy that plants get from the sun is used to produce glucose that can be burned in mitochondria to make ATP, which is then used to drive all the energy-requiring processes in the plant. Photosynthesis occurs in plants in the chloroplast,
Rating:Essay Length: 1,332 Words / 6 PagesSubmitted: March 29, 2010 -
Photosynthetic Pigments
Jessica Tietgens Botany Lab 2 May 2008 Photosynthetic Pigments Introduction: In this lab we were to investigate photosynthetic pigments using paper chromatography and then using the spectrophotometer determine the absorption for each pigment. Since the lab before had a difficult time getting all 5 pigments to show, it was expected we might, as well, not get all 5 pigments using the same procedure. As for the absorption, I figured that brighter, lighter; colors would have
Rating:Essay Length: 1,017 Words / 5 PagesSubmitted: May 28, 2010 -
Photovoltaic Cells
Photovoltaic cells are solid state devices that convert light directly into electricity. Photovoltaic literally means “light electricity.” These devices can be commonly found providing power for small scale devices such as calculators, watches, and small radios. However, they are not limited to small scale systems. They are also used to power satellites, communications equipment, houses and many other things, especially in remote locations where a power grid is not readily available. In isolated locations
Rating:Essay Length: 1,676 Words / 7 PagesSubmitted: December 1, 2009 -
Phylum: Arthropoda
The phylum Arthropoda is the largest and most varied in the animal kingdom. It includes well over one million described species. This represents approximately three-quarters of all known biological organisms, living or extinct. Countless arthropods remain undescribed (not yet named and studied), and the actual number of living species could be as high as ten million or more. Some of the more well known arthropods include insects, crustaceans, and spiders, as well as the fossil
Rating:Essay Length: 596 Words / 3 PagesSubmitted: November 12, 2009 -
Physiacl Assessment
1. Wash your hands and assemble equipment. Greet the patient and explain what you need to do. Provide for privacy. 2. Begin with the 5 vital signs: Temperature, Pulse, Respirations, BP and Pain. Ask the patient how he feels and observe the environment. As you assess the body by systems observe for mobility and ROM. 3. HEENT • head: shape and symmetry; condition of the hair and scalp • eyes: conjunctiva and sclera, pupils; reactivity
Rating:Essay Length: 318 Words / 2 PagesSubmitted: December 13, 2009 -
Physic Lab Report
LAB 02: FREE FALL THEORY The purpose of the experiment was to measure and confirm the acceleration a is constant and a= 9.8 m/s2 due to gravity by timing a free-falling ball. Assumptions: There is no air resistance. Acceleration x_f-x_0= v_oy+1/2.a.t^2 x-0=1/2 a.t^2 x= 1/2.a.t^2=>a=2x/t^2 PROCEDURE Using a receptor pad to collect the table position vs time, with the height range 5cm to 120cm. The height is the distance from the pad to the ball.
Rating:Essay Length: 344 Words / 2 PagesSubmitted: May 16, 2019 -
Physical Constants, Properties, Mathematical Calculations and Equations
• Emission • There are two significant effects of contamination by metal ions: 1. Salinity: When metal ion concentrations are too high and exceed safe limits. High salinity water is unsuitable for drinking or irrigation purposes. 2. Toxicity: Can occur even with extremely low concentrations of metal ions. These ions are often called heavy metal ions because their density are five times greater than that of water. • Atomic emission occurs when electrons are energetically
Rating:Essay Length: 661 Words / 3 PagesSubmitted: November 9, 2009 -
Physical Fitness
Physical fitness is a necessity for most people’s everyday life, no matter what sex or race. The recommended average in which an adult should undertake daily physical fitness is 150 minutes of moderate aerobic activity a week, and at least strength training twice a week. In order to achieve a healthy lifestyle you must be able to perform daily workouts and eat a well a balanced diet. Physical fitness affects a person not only physically
Rating:Essay Length: 473 Words / 2 PagesSubmitted: February 23, 2017 -
Physical Science - Density
Science Lesson Plan Grade Level: 5th Area: Physical Science- Density Objectives: Students will prepare litmus strips from red cabbage juice. With their strips they will test 5 household liquids for the color change the liquid produces on the indicator strip. Students will combine these results into a class chart. Materials: Small red cabbage, coffee filters water, baggies, lemon juice, baking soda Set: Today we are going to make indicator strips out of red cabbage juice.
Rating:Essay Length: 990 Words / 4 PagesSubmitted: November 24, 2009 -
Physical Science Lab #5
Physical Science lab #5 Objective The goal of this experiment is to develop a theory, which allows us to understand the motion of a marble. Materials Wooden roller coaster, marble, ruler, timer, clamp, physics stand. Theory In this experiment, we are finding the Conservation of Energy. Energy is neither created nor destroyed. Energy is summed up into two different properties: Potential energy and Kinetic energy. The law of Energy states that: Total Energy = Potential
Rating:Essay Length: 902 Words / 4 PagesSubmitted: January 14, 2010 -
Physical Therapy/college
There are myriads of individuals in the world who attend college and each individual has their own ground(s) why they decide to attend college. The rationale in why I have decided to attend college is to have the opportunity to get an education and have the prospect to provide to my community and to the world. My major is Physical Therapy and I covet to have the opportunity to help other people and formulate a
Rating:Essay Length: 300 Words / 2 PagesSubmitted: November 26, 2009 -
Physician Assistant
Thesis: Physician assistants are well-recognized and highly sought-after members of the health care team who, with doctors, provide quality care to patients. In order to do that, training, hard work, and a good education are required. I. As history says, physician assistants have always been a much needed commodity in health care. A. Who came up with the idea for a physician assistant? 1. Dr. Eugene A. Stead, Jr. came up with the idea in
Rating:Essay Length: 1,089 Words / 5 PagesSubmitted: January 15, 2010 -
Physician Assistant Field Experience
Physician Assistant Field Experience INTRODUCTION Today, physician assistants function as the doctor's right-hand man(or woman), backup, or in some cases, their substitute. Sometimes I wonder what the difference between a physician assistant and a doctor really is. According to T.J. Sacks, “Within the limits of their expertise, physician assistants provide care that is the equivalent in quality to the care provided by the family physician”(Sacks, 2002, pg. 165). The physician who supervises the PA is
Rating:Essay Length: 1,497 Words / 6 PagesSubmitted: April 18, 2010 -
Physics
Physics coursework Aim to see how the resistance of a wire changes with the length of the wire. Also does the colour etc affect the resistance as well. Factors  Thickness  Length of the wire  What is it made of  Where is it  Is it a good or bad conductor of electricity  volatge Prediction I predict that the resistance will become higher as the length becomes longer because the
Rating:Essay Length: 874 Words / 4 PagesSubmitted: November 25, 2009 -
Physics
Science is one of the fastest growing and largest fields in the American economy. It is also the most widely spread field. There are many branches of science, they are all fascinating in their own way. Physics is the most interesting in my opinion, just because it is the only field that strives to explain how the universe works using the universal language of math. There are many facts that you will need or
Rating:Essay Length: 934 Words / 4 PagesSubmitted: November 28, 2009 -
Physics
Conservation of Momentum 1. Trial 1 T1 (s) T2 (s) Vi (m/s) V2 (m/s) 0 0.071 0.351 1 0.111 0.225 2 0.118 0.215 Trial 2 0 0.061 .409 1 0.092 0.272 2 0.101 0.248 Trial 3 0 0.057 0.440 1 0.083 0.300 2 0.088 0.283 Mass of car 1 = 993.0 g Mass of car 2 = 496.7 g 2. trial 1 Car 1 momentum before collision P=mv P=(.993kg)(.351m/s) P= .349 kgm/s Car 2 momentum
Rating:Essay Length: 432 Words / 2 PagesSubmitted: December 29, 2009 -
Physics
From Aristotle to Newton to Einstein to contemporary Grand Unified theoreticians, physics derives its prescience from increasing generality of natural representation. The concept of such a representation can be illustrated more fruitfully than it can be defined (the definition requiring a formulation in set theory). Newtonian mechanics generalizes Aristotle through the intuition of mass that obviates physical distinctions between heaven and earth, celestial and terrestrial substances. Einsteinian concepts of relativity (laws of physics apply in
Rating:Essay Length: 259 Words / 2 PagesSubmitted: April 3, 2010 -
Physics 11 Light Lab
Biology 12 AP - Ulcer Buffer Lab Purpose: To observe and compare albumin or alka-seltzer’s ability to control pH levels, in order to see which would be a better buffer and therefore a better treatment for a stomach ulcer. Hypothesis: The Alka-Seltzer drug may work better, because it would mostly likely be more basic than the albumin seeing as it contains baking soda as one of its key components which is often used to neutralize
Rating:Essay Length: 501 Words / 3 PagesSubmitted: December 16, 2017