Presently‚ commercial NR latex concentrate is preserved with either a high ammonia system (HA latex) at 0.7% ammonia or LA-TZ a low ammonia system (LA latex) at 0.2% ammonia) and 0.025% of 1:1 mixture of tetramethylthiuram disulphide (TMTD) and zinc oxide. The HA system poses serious environmental problem such as strong smell due to the presence of large amount of ammonia. On the other hand‚ TMTD has been implicated to produce carcinogenic nitrosamines in rubber products and is an allergen causing
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Chemical Report The chemical I will be writing this report on is oxygen. The name oxygen comes from the Greek word “oxygens‚” which means “acid producer”. Dictionary.com defines oxygen as “a colorless‚ odorless‚ gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature.” Oxygen has many uses today. First‚ oxygen is used by people‚ plants‚ and animals in the respiration process. Tanks of oxygen are used in the healthcare field to treat
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for example when copper II Hydroxide is heated. There are many substances used in this experiment‚ the elements are Hydrogen Gas‚ Aluminum‚ and solid Copper‚ the compounds are Copper II Nitrate‚ Sodium Hydroxide‚ Copper II Hydroxide‚ Copper II Oxide‚ Hydrochloric Acid‚ Sodium Nitrate‚
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archives to store valuable newspaper‚ letter or maps. The choice of boxes is important because if it not suitable it can damage the materials. The next factor is from air pollutants. Air pollutants criteria contain of three which is sulfur oxides‚ nitrogen oxides and ozone that can arise in form of indoor pollution. Some of those criteria can be control by installed system to remove it and some only can be
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Production and Properties of Metals Mr J E Chuter‚ Cert Ed 2012 En No 20100292 Introduction I have decided to produce a project based on the production and properties of metals‚ as although I have worked as a welder for over 30 years‚ and a welding teacher for the last 2 years on apart-time basis‚ I felt I didn’t know enough information on the material that I work on‚ on a daily
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encountered Combustion reaction (burning) element + oxygen → oxide e.g. 4Na (S) + O2 (g) → Na2O (s) Reaction with hydrogen element + hydrogen → hydride e.g. Ca (s) + H2 (g) → CaH2 (s) Reaction between an oxide and water metallic oxide + water → hydroxide * metallic oxide is also known as “basic oxide” e.g. Na2O (s) + H2O (l) → 2NaOH (aq) non-metallic oxide + water → acid * non-metallic oxide is known as “acidic oxide” e.g. SO2 (g) + H2O (l) → H2SO3 (aq) Reaction between active
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and appearance was identified. We determined the solubility of the elements by using distilled water. We used red and blue litmus paper for the Group IIA Metal Oxides. But for the Group IA and Group IIA elements and Group IVA elements‚ we didn’t use litmus paper. Then‚ we wrote a balanced equation to show the reaction between Metal Oxides and water. __________________________________________________________________________ INTRODUCTION Chemical periodicity is defined as the similarities of chemical
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Magnesium Oxide: Origin‚ Production and Utilization Magnesium oxide is a basic or alkaline kind of earth metal that naturally originates from seawater. The compound is odorless and colorless that makes it difficult to see by the naked eye. To produce such compound‚ extraction from the seawater by electrolysis and several chemical processes id done. The compound is formed from the thermal processes which make uses of air and oxygen. Magnesium hydroxide is also produced. The versatility of uses of
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samples was placed in a test tubes and the physical state‚ color‚ and appearance was identified. The solubility of the element was tested through the use of water. The Group IIA Metal Oxides was tested through the use of the pink and blue litmus paper. Also a balanced equation was written to show the reaction between oxides and water. INTRODUCTION Chemical periodicity is defined as the similarities of chemical elements that are close to each other in the periodic table. When elements are arranged
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powder coatings on galvanized steel. Apparently the adhesion is compromised due to the zinc coating outgassing. Is there any truth to this? Is there anything I can do to prevent outgassing of the zinc coating? lightly-acidic solution will remove oxides from the surface as well as slightly etch the steel surface‚ providing a better surface profile for top coating to adhere to. Proprietary solutions are available that are designed to work effectively on galvanized or other zinc surfaces. ASK DR
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