Chemical
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In chemistry, a chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e. without breaking chemical bonds. They can be solids, liquids or gases. Chemical substances are often called 'pure' to set them apart from mixtures. A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory. Other chemical substances commonly encountered in pure form are diamond (carbon), gold, table salt (sodium chloride) and refined sugar (sucrose). However, simple or seemingly pure substances found in nature can in fact be mixtures of chemical substances. For example, tap water may contain small amounts of dissolved sodium chloride and compounds containing iron, calcium and many other chemical substances. Chemical substances exist as solids, liquids, gasses, or plasma and may change between these phases of matter with changes in temperature or pressure. Chemical reactions convert one chemical substance into another. Forms of energy, such as light and heat, are not considered to be matter, and thus they are not "substances" in this regard. From Wikipedia under the
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Q. Describe equipment used on the job as a chemical assistant, identify what type of degrees, skills, course work, or training is required to be a chemical assistant. Asked by struggling student - Sun Sep 3 21:26:03 2006 - Chemistry - 1 Answers - Comments A. Chemical Lab Technician Back to search Contact Information: Manpower Professional 3075 Governors Place Blvd. Suite Dayton, OH 45409 Job Reference: PR45409_NT_040KSA174 View other jobs with this company Contact: Phone: Fax: Professional Recruiter 937-643-7467 Apply Online | Email this job | Save this job Job Description: Chemical Lab Tech with experience in the rubber industry. Prefer experience in Research and Development of compounds and processes involved with vulcanizing, testing, molding, and recycling of rubber products. Chemical laboratory assistant Tasks You work in the chemical lab in our research and development division, where you perform jobs in quality control and failure analysis. You carry out analyses of: * metallic and non-m [cont.] Answered by - Mon Sep 4 14:03:23 2006 From Yahoo Answer Search: "chemical" |
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