UNICEF PROMOTION OF HOUSEHOLD WATER TREATMENT AND SAFE STORAGE IN UNICEF WASH PROGRAMMES January 2008 PROMOTION OF HOUSEHOLD WATER TREATMENT AND SAFE STORAGE IN UNICEF WASH PROGRAMMES Why is household water treatment and safe storage an important intervention for preventing disease? Unsafe drinking water‚ along with poor sanitation and hygiene‚ are the main contributors to an estimated 4 billion cases of diarrhoeal disease annually‚ causing more than 1.5 million deaths‚ mostly among children
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SHEET (Please see attached) TREATMENT OF RESULTS Elements that show metallic properties in the third row of the periodic table of elements are sodium (Na) and aluminum (Al). Those of magnesium (Mg)‚ silicon (Si)‚ phosphorus (P)‚ sulfur (S)‚ chlorine (Cl)‚ and argon (Ar) exhibit nonmetallic properties. The color of the litmus indicator changes as it combines with acidic and basic solutions. To indicate as to what property the element has‚ the
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help you to answer this question. Oxygen is in Group 6 of the periodic table. a i How many protons are in an atom of oxygen? (1) ii How many electrons are in an atom of oxygen? (1) b Chlorine is in Group 7 of the periodic table. Complete the electronic structure of chlorine: 2‚ ........... (1) c Fluorine is also in Group 7. Explain why in terms of electronic structure. (1) d Neon and argon are in Group 0 of the periodic table. They are very unreactive elements
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The Effects Sodium Chloride has on pond water Introduction Ponds are depressions in the ground that fill with water from either run offs or melting snow or rain fall from many different weather changes. There are two types of ponds permanent and temporary. Ponds tend to be much smaller in size and are usually only six to ten feet in depth. This differs from a lake because the size of a lake is much larger and is much deeper. The temperature of a pond is usually the same from top to bottom and
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agents‚ are bleaches‚ hair coloring agents‚ scouring powders‚ and toilet bowl cleaners. The most common oxidizing agent in bleaches is sodium hypochlorite‚ NaClO (or NaOCl). Commercial bleaches are made by bubbling chlorine gas into a sodium hydroxide solution. Some of the chlorine is oxidized from the molecular form (Cl2) to the hypochlorite ion‚ ClO-. Some of the molecular form is also reduced to the chloride ion‚ Cl-. This type of reaction‚ where the same type of element is both oxidized and
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The Inhumane Weapons of Warfare Chemical warfare is a barbaric weapon of war that should be banned from any war situation. Chemical Warfare is using any chemical or chemical mix that can physically or mentally harm a human being. It has been killing people for over 2600 years and was created by Spartans. “They grabbed burning sulfur pitch and threw it over the walls of Athens attempting to fill the city with toxic gas.”[6] They tried this because they had a small army that was trying to take over
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Chapters 11 12 Periodic Table Name __________________ ( ) Class __________ Date _________ History of the Periodic Table Russian chemist Dmitri Ivanovich Mendeleev 1834-1907 Arranged elements in order of increasing atomic masses Elements with similar chemical properties fall into the same vertical column Such an arrangement is the Periodic Table The Periodic Table The Periodic Table is a list of elements arranged in order of ______________ _____________ (__________) ____________. Groups
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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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Shipboard Sanitation is covered in FM 55-501‚ Chapter 2‚ paragraph 64-69. Cleanliness and sanitary conditions are essential since personnel aboard ship live and work in restricted quarters. The health of each crew member is the concern of all aboard‚ as any infection or unhealthy habit can affect the overall health or efficiency of the crew. High sanitary standards must be met to protect the crew from infection and illness. Conditions aboard the ship should include adequate cleaning and laundry
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particle (atom). Particles can join up with other particles of the same type to form molecules. Examples: Hydrogen = H2 . This means there are two atoms of hydrogen joined together to form a molecule of hydrogen gas. Oxygen = O2‚ Nitrogen is H2‚ Chlorine is Cl2. A compound is a pure substance of two or more elements chemically combined together in a set ratio. Example: Water = H20 this means there are always 2 atoms of Hydrogen and 1 atom of Oxygen in every molecule of water. [pic] A Mixture
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