Chapter 1 Chemical Reactions and Equations Q.1. Why should magnesium ribbon be cleaned before burning in air ? Ans: Magnesium ribbon is a very reactive metal. When stored it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide being a stable compound prevents further reaction of magnesium with oxygen. The magnesium is cleaned before burning in air to remove this layer so that the metal can be exposed to air properly. Q.2. Write the balanced
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levels on the reef are too great to be repaired naturally. This example of chemical bleaching should be noted in history as a reason for retiring the practice of using man made chemicals on reefs to promote their
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Chemical kinetics‚ also known as reaction kinetics‚ is the study of rates of chemical processes. Chemical kinetics includes investigations of how different experimental conditions can influence the speed of a chemical reaction and yield information about the reaction’s mechanism and transition states‚ as well as the construction of mathematical models that can describe the characteristics of a chemical reaction. In 1864‚ Peter Waage and Cato Guldberg pioneered the development of chemical kinetics
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The flour produced from the cassava plant‚ which on account of its low content of noncarbohydrate constituents might well be called a starch‚ is known in world trade as tapioca flour. It is used directly‚ made into a group of baked or gelatinized products or manufactured into glucose‚ dextrins and other products. Starchy foods have always been one of the staples of the human diet. They are mostly consumed in starch-bearing plants or in foods to which commercial starch or its derivatives have been
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Case 10: Plant Nutrients Inc. Plant Nutrients Inc. (PNI) is a medium-size retailer of crop supplies in Lancaster‚ Pennsylvania. Brian Dunwoodie‚ the general manager‚ is preparing a proposed operating statement for 1999‚ to send to management at PNI’s parent company. This statement must reflect an increase in volume of two percent while maintaining the required 13 percent return on investment in the business. He is considering a number of ways of improving performance including: achieving better
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this problem. Firstly the causes of this problem is the attitude of human. The human attitude nowadays really disappointing. They do not have the love feeling to the nature and throw garbage or any chemical substances anywhere including the river‚ the sea and any water sources. So this chemical substance will harm the water and we as the user will use the water without notice that we use the contaminated water. Slowly or in the long term our body will be affected. Besides that. the excessive used
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Chemicals in medicines Rakesh Mohan Hallen The words medicine’ and ’drug’ are often used in our country to mean the same substances: any substance‚ manufactured artificially‚ which can help recovery from sickness‚ relieve symptoms or modify a natural process in the body. A medicine is often a mixture of several chemical compounds. Even if it has only one active component compound often other substances are used as fillers or binders to give it bulk. Chemistry‚ the science related to chemical substances
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are more to aquatic plants than just floating on the surface of water. Aquatic plants are plants that can adapt and live in a freshwater environment. They are sometimes called hydrophytes. These include plants that live in fresh wetlands‚ swamps‚ ponds‚ lakes‚ and marshes. This type of plant actually serves two important functions. First‚ they help oxygenate water (2006) and they provide nutrients and food for some fishes (Tappin‚ 2003). There are many types of aquatic plants including rooted‚ emergent
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Assignment 5 Sheet Harbour Chemicals Sheet Harbour Chemicals (SHC) manufactures chemicals used in the paint industry. The process involves three departments. Chemical A‚ which is purchased for $3 per liter‚ is processed through Department 1 in batches of 100 liters. Each batch of chemicals processed through Department A produces 70 liters of chemical B and 30 liters of chemical C. Chemical B is sold for $10 per liter. Chemical C is used in Department 2 to produce chemicals D‚ E‚ and F. Department 2
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a schoo Chapter 35 The Plant Body 1. Describe and compare the three basic organs of vascular plants. Explain how these basic organs are interdependent. The three basic organs of a vascular plant are the stems‚ leaves‚ and roots. The stems consist of nodes‚ where leaves attach‚ and internodes between the nodes. The stem is responsible for elongation of the plant and acts as a central axis for other organs to attach to. The roots help to anchor the plant as well as absorb water and nutrients
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