7) Determine the empirical formula of the rodenticide warfarin (a carbon-hydrogen-oxygen compound)‚ which consists of 74.01% C and 20.76% O by mass. 8) Selenium forms two oxides. One has 28.8% O by mass and the other has 37.8% O. What are the formulas of these two oxides? 9) Adenine is a carbon-hydrogen-nitrogen compound with 44.45% C and 3.73% H by mass. It’s molecular mass is 135.14 u. What is its molecular formula? 10) Combustion of a 0.312 g sample of a carbon-hydrogen-nitrogen
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Different kinds of liquids stain your teeth differently. For example tea stains your teeth more than milk does. I’m doing this experiment because I think it is very interesting that there are so many different kinds of liquid that can stain your teeth. What things stain your teeth? To start with you should never start smoking or use tobacco. The nicotine and tar in the cigarettes stain your teeth very drastically. You can’t even imagine how fast smoking stains your teeth. Other things that stain
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Biochemical Oxygen Demand (BOD) Biochemical Oxygen Demand‚ BOD‚ as it is commonly abbreviated‚ is one of the most important and useful parameters (measured characteristics) indicating the organic strength of a wastewater. BOD measurement permits an estimate of the waste strength in terms of the amount of dissolved oxygen required to break down the wastewater. The specifics of the analysis are discussed in detail in Standard Methods for the Examination of Water and Wastewater. The BOD test is
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What is the empirical formula of a compound that contains 75% Ag and 25% Cl by mass? AGCL Calculate the approximate number of molecules in a drop of water with a mass of 0.10 g. 3 x 1021 molecules What is the percentage composition of CaSO4? 29.44% Ca‚ 23.55% S‚ 47.01% O What mass of calcium bromide is needed to prepare 150.0 mL of a 3.50 M solution? (Assume that the molecular weight of CaBr2 is 200.618 g/mol) 105 g Nitrous oxide (N2O)‚ or laughing gas‚ is commonly used as an anesthetic
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I. Purpose Through this project‚ our goal was to demonstrate an understanding for the concepts of pressure‚ Newton’s Laws‚ Bernoulli’s Principle‚ volume flow rate‚ efficiency‚ power‚ potential and kinetic energy‚ and work. It provided a summation for most of the topics covered in this course. II. Materials Craftsman Leaf Blower (220 mph‚ 120 V‚ 12A‚ 8 lbs.) ¾’’ Plywood (75 lbs.) Milk Crate (3 lbs) Spray Paint (12 oz.) Blue Tarp Staple Gun HVAC Duct Vent Piping ( 2
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Extractive Metallurgy Minerals are naturally occurring chemical substances in the earth’s crust obtainable by mining. Out of many minerals in which a metal may be found‚ only a few are viable to be used as sources of that metal. Such minerals are known as ores. Examples: Galena‚ PbS‚ etc. It is usually contaminated with earthly or undesired materials known as gangue. The extraction and isolation of metals from ores involve the following major steps: • Concentration of the ore‚ • Isolation of the
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10.19.2011 TITLE: The Importance of Oxygen for Life PURPOSE: To determine whether test tubes filled with bacteria‚ a few salts‚ distilled water‚ and glucose would grow in the presence or absence of oxygen. By adding oxygen to certain tubes and withholding it from other tubes‚ one can determine which bacteria grow the most efficiently. HYPOTHESIS: The test tubes of bacteria with oxygen will grow and thrive over the test tubes without oxygen. METHODS: Using the data shown in Table 7-A-1
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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‚ 1998). Phosphates are present in fertilizers and laundry detergents and can enter the water from
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Generations Have you ever thought about what it would be like to live in the past? The future? If one were to choose‚ are the future children going to be luckier than those that lived in the past conditions? 65 million people were born into the time period called “Generation Y.” Generation Y‚ who consists of those who were born between 1980 to 1999‚ are commonly compared to the Silent Generation because of the number of births. The Silent Generation is the generation of Americans born from roughly
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It is really amazing to see what happened so far in this generation. Today‚ we have everything we ever wanted with the help of science and technology. Science and technology completely changed the way we function everyday. We have different kinds of drugs and medicine that saves a lot of people everyday. We have amazing electronics and devices that can do anything with your control. We also have media technology where we are connected to everyone around the world. When talking about the technology
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