Regents Chemistry Quarter 1 Midterm Review 1. The percent by mass of oxygen in Na2SO4 (formula mass = 142) is closest to 1) 11% 3) 45% 2) 22% 4) 64% 2. Given the unbalanced equation: __Al(s) + __O2(g) → __Al2O3(s) 3. 4. 5. 6. 7. balance the equation using smallest whole number coefficients. The percent by mass of aluminum in Al2O3 is approximately 1) 18.9 3) 47.1 2) 35.4 4) 52.9 What is the approximate percent composition by mass of CaBr2 (formula mass = 200)
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Food Chemistry: Option F Food Groups: F.1 Food & Nutrients Food: any substance‚ whether processed‚ semi-processed or raw‚ which is intended for human consumption‚ and includes drinks‚ chewing gum and any substance which has been used in the manufacture‚ preparation or treatment of “food” but does not include cosmetics or tobacco or substances used only as drugs. Nutrients: any substance obtained from food and used by the body to provide energy‚ to regulate growth‚ and to maintain and repair
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The chemistry of hairspray What is hairspray: introduction Hair spray (or hair lacquer) is a common household aqueous solution that is used to keep hair stiff or in a certain style. Weaker than hair gel‚ hair wax‚ or glue‚ it is sprayed to hold styles for a short period of time. Using a pump or aerosol spray nozzle it sprays evenly over the hair. Hairspray was first developed and manufactured in 1948 by Chase Products Company‚ based in Broadview‚ Illinois.Its active ingredient is a suitable
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Republic of the Philippines Department of Education Region IV–B MIMAROPA Division of Oriental Mindoro Naujan West District P. GARIS MEMORIAL ELEMENTARY SCHOOL Sta. Maria CHILD PROTECTION POLICY All children and young people have the right to go about their daily lives without the fear of being threatened‚ assaulted or harassed. No one should underestimate the impact that bullying can have on a person’s life. It can cause high levels of distress‚ affecting young people’s well-being‚ behavior
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Environmental Scan Paper Steve Pachorek MGT/498 October 8th‚ 2012 George Staight Environmental Scan Paper A business environment is made up of both internal and external factors. The environment of a business must be scanned to be able to determine what factors the company can use to determine the development and forecasts that will help in the success of the business. The definition of Environmental Scanning‚ as per managementstudyguide.com‚ is the “possession and utilization of information
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Chemistry Notes Cracking: * 2 types of Cracking; Catalytic cracking and Steam/thermal cracking. * Catalytic cracking‚ using a catalyst called Zeolite (Aluminosilicate)‚ 500 degrees C‚ in the absence of air and at pressures just above atmospheric * Thermal cracking is done without a catalyst; steam is passed through very hot metal tubes at 700-1000 degrees C at just above atmospheric pressure. * This is used to break down longer chains of unsalable hydrocarbons into smaller salable
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Environmental security is one of modern worlds raging topics‚ and one that should conern us all; as indiviuals‚ as a nation and as a part of this precious Earth. Environmental security scrutinizes the possible disastrous and negative implications of environmental events on the world of today. It revolves around a very sensitive theme‚ of the powerful impact of years of human conflict and international relations on the environment and how this possible threat will not only effect one country‚ but
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Chemistry in Photography Background A photograph is an image made by a photo-chemical reaction which records the impression of light on a surface coated with silver atoms. The reaction is possible due to the light-sensitive properties of silver halide crystals. Equation form for silver halides: Ag + + e - Ag Species produced include: Ag2+‚ Ag2o‚ Ag3+‚ Ag3o‚ Ag4+‚ Ag4o In 1556‚ the alchemist Fabricius was the first to discover that light can photochemically react with these crystals to
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Chemistry Coursework – Titration Background Science A titration is the neutralisation of an acid or an alkali. To achieve this‚ one must be added to the other in a specific amount‚ strength and concentration. A substance is neutral when its pH is 7. It is most acidic closer to 0 and is most alkaline closer to 14. 28492453194050 0 7 14 595423979670
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EC 307: Resource & Environmental economics Unit 6: Air Pollution Lecturer: Dr. Ricardo Gonzalez gonzalez_r@usp.ac.fj Room S239‚ School of Economics‚ Laucala Campus‚ USP‚ Suva‚ Fiji Islands. Introduction • Both consumption and production of energy produce a considerable amounts of air pollution. – – – – – – CO2 CO SO2 NOx PM VOC (Carbon dioxide) (Carbon monoxide) (Sulphur Dioxide) (Nitrogen oxides) (Particulate matter) (Volatile organic compounds‚ e.g.‚ CH4) EC307
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