CSEC CHEMISTRY NOTES ON PERIODIC TRENDS From Chemistry for CSEC by Tania Chung-Harris and Mike Taylor Chemistry for CAPE by Susan Maraj and Arnold Samai Periodic Trends in Group II Elements in Group II The elements in Group II are called alkaline earth metals. Be‚ Mg‚ Ca‚ Sr‚ Ba‚ Ra Beryllium‚ Magnesium‚ Calcium‚ Strontium‚ Barium‚ Radium These elements bond by metallic bonds (intramolecular forces) to form giant metallic structures. The size of the
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Chemistry revision Atoms elements and compounds Atom-the smallest part of an element that can still be recognized as an element Element-a substance made up of only one type of atom. An element cannot be broken down chemically into any simpler substance Nucleus-middle of the atom‚ which contains protons and neutrons Electron-tiny particle‚ which surrounds the nucleus with a negative charge Compound-when two elements react and combine together which contain more than one element. There
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The ozone layer is a layer in Earth’s atmosphere which absorbs most of the Sun’s UV radiation. It contains relatively high concentrations of ozone (O3)‚ although it is still very small with regard to ordinary oxygen‚ and is less than ten parts per million‚ the average ozone concentration in Earth’s atmosphere being only about 0.6 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres (12 to 19 mi) above Earth‚ though the
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deadly weapon during the world war I David Seo Mr. McKenzie Oct. 28‚ 2010 Thesis: Poison gases should be banned from the battlefield because they have fatal and catastrophic effects on humans‚ the nature‚ and they were not as effective as other weapons for winning the war. Poison gases had many deadly effects on human bodies. Chlorine‚ phosgene‚ and mustard gases were mainly used (First World War). “Deficiencies of chlorine were overcome by phosgene and they were used mixed with equal
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| 1. | | Passing an electric current through a certain substance produces oxygen and sulfur. This substance cannot be a(n) Your Answer: | element. | | | An element cannot be broken down into other elements. | | 2. | | Pick the chemical change that occurs when a lit match is held under a piece of metal. Your Answer: | match burns | | | Chemical changes‚ which release heat and light‚ occur during the combustion process. | | 3. | | Which identification is incorrect for the elements
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molecule. A. Potassium B. Iodine C. Magnesium D. Lithium 13. The standard atomic weight is based on the weight of the element A. magnesium. B. hydrogen. C. carbon. D. oxygen. 14. Which of the following is not a halogen element? A. Chlorine B. Bromine C. Fluorine D. Oxygen 15. All chemical compounds can be divided into two classes. These classes are A. hydrocarbons and alcohols. B. alkanes and alkenes. C. aliphatic and aromatic. D. inorganic and organic. 16. Acetic acid is a compound known as
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Gunite and vinyl liner pools are the two most common types of inground pool construction in the northeastern states and both are good options. There are some major differences between them‚ in terms of construction‚ durability and maintenance. Getting all the information can help you make the wisest choice‚ so let’s look at some particulars about each type. Gunite Pools Gunite pools are created using steel rebar coated with an application of concrete to make the shell for the pool. It must meet
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Capital punishment has been a controversial topic in association to ethics all of its existence. Issues pertaining to the execution methods‚ reasonability in the relationship of punishment to the crime‚ who receives the death penalty‚ and innocence have been discussed and researched in great lengths. Capital punishment is still an active form of “deterrence” in the United States for crimes considered the worst of the worst. In this paper I will discuss the history of the death penalty. I will also
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IGCSE PRE-AICE CHEMISTRY 0620 OFFICIAL STUDY GUIDE Notes: To avoid any confusion concerning the symbol for litre‚ dm3 will be used in place of l or litre.Valence electrons are known as valency electrons for this test. Nature of Matter The states of matter are solid‚ liquid‚ and gas‚ in respective order of kinetic energy. State of Matter | Definite Volume | Definite Shape | Solid | Yes | Yes | Liquid | Yes | No | Gas | No | No | Diffusion:
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specialty chemicals division‚ it would be most effective to complete an econometric model. Determining how drastically a change in the oil market would affect the sales in this division would be very helpful for the overall sales forecast. Finally‚ the bromine division should be forecasted using the
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