Chemistry: How to Make Matches

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How to Make Matches Aug 27th 2011, 11:31 Really this should be entitled "why you don't want to make your own matches". There are a couple of recipes for matches, pretty much using chemicals the average person doesn't want to store, use, or dispose. You can mix antimony sulfide (poisonous) and potassium chlorate, with a little cornstarch as a fuel and gum to hold it together. Alternatively, you can use sesquisulfide of phosphorus instead of an antimony compound. White and red elemental phosphorus also work, but they are extremely toxic. Friction matches on a stick are familiar to most people, though if you coat paper with the mixture, you can fold the paper and draw a fine splint of wood across the coating. Tell me more...

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Chemistry: Most Popular Articles: Chemical & Physical Changes

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Chemical & Physical Changes Aug 27th 2011, 10:17 Chemical and physical changes are related to chemical and physical properties. Chemical Changes Chemical changes take place on the molecular level. A chemical change produces a new substance. Examples of chemical changes include combustion (burning), cooking an egg, rusting of an iron pan, and mixing hydrochloric acid and sodium hydroxide to make salt and water. Physical Changes Physical changes are concerned with energy and states of matter. A physical change does not produce a new substance. Changes in state or phase (melting, freezing, vaporization, condensation, sublimation) are physical changes. Examples of physical changes include crushing a can, melting an ice cube, and breaking a bottle. How to Tell Chemical & Physical Changes Apart A chemical change makes a substance that wasn't there before. There may be clues that a chemical reaction took place, such as light, heat, color change, gas production, odor, or sound. The starting and ending materials of a physical change are the same, even though they may look different. More Examples of Chemical and Physical Changes Stay up to date on the latest chemistry news, learn chemistry, and get instructions for chemistry projects. Sign up for our free newsletter today!

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Chemistry: What's Hot Now: Element Symbol Quiz - Element Symbols for the First 20 Elements

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Element Symbol Quiz - Element Symbols for the First 20 Elements Aug 27th 2011, 10:01 Element Symbol Quiz The First 20 Chemical Elements This multiple-choice quiz will test whether you know the names for the first 20 elements when you are given the element symbol. You may wish to review the element symbols before you begin. Are you ready? Start this quiz again or test your knowledge of element symbols given the element name. More Chemistry Quizzes Element Picture Quiz Atom Basics Quiz Hazard Symbol Quiz Rock & Mineral Chemistry Quiz Which Mad Scientist Are You? Which Element Are You?

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Chemistry: What's Hot Now: How to Use a Periodic Table

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How to Use a Periodic Table Aug 27th 2011, 10:01 The periodic table of the elements contains a wide variety of information such as element symbols, atomic number and atomic mass is most common, but the periodic table can contain even more data than previously expected. This will show you how to use a periodic table to gather information about the elements. The periodic table contains informative cells for each element arranged by increasing atomic number and chemical properties. Each element's cell typically contains: The element's symbol. Symbols are the abbreviations of the element's name. In some cases, the abbreviation comes from the element's Latin name. The element's atomic number. This number is the number of protons an atom of this element contains. The number of protons is the deciding factor when distinguishing one element from another. The element's atomic mass in atomic mass units. This number is a weighted average mass of the element's isotopes. The element's name. Many periodic tables will include the name to help those who may not remember all the symbols for elements. The horizontal rows are called periods. Each period indicates the highest energy level the electrons of that element occupies at its ground state. The vertical columns are called groups. Each element in a group has the same number of valence electrons and typically behave in a similar manner when bonding with other elements. The bottom two rows, the lanthanides and actinides all belong to the 3B group and are listed separately. Many periodic tables identify element types using different colors for different element types. These include the alkali metals, alkaline earths, basic metals, semimetals, transition metals, nonmetals, lanthanides, actinides, halogens and noble gases. A good periodic table is a great tool for solving chemistry problems. You can use an online periodic table or print your own.

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Chemistry: This Day in Science History - August 27 - Osamu Shimomura

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This Day in Science History - August 27 - Osamu Shimomura Aug 26th 2011, 22:05 August 27th is Osamu Shimomura's birthday. Shimomura is a Japanese organic chemist who shares the 2008 Nobel Prize in Chemistry with with Roger Tsien and Martin Chalfie for their discovery of the green fluorescent protein (GFP). This protein glows green under fluorescent light and is used widely as a bioindicator in the studies of gene transfers and gene transcriptions. The GFP gene can be attached to the gene or protein that is being investigated so any future proteins made will have a GFP attached to it. When a fluorescent light shines on the sample, the distinctive green glow will show where all the modified proteins are located. Shimomura was the first to isolate GFP and identified which part produced the fluorescence. Happy Birthday Shimomura! Find out what else occurred on this day in science history. Follow Chemistry on Facebook or Twitter.

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