Self Heating Food and Drink Cans Heater meals – originally developed for military use – are ready-made self-heating meal packs. They can be heated in many ways – by pressing a button on the packaging‚ unwrapping and shaking the pack‚ or pouring the contents of one bag into another and waiting for a few minutes – all of which use exothermic chemical reactions. These meals can be used to motivate students to study such reactions relatively safely and without the use of a burner. Plus there is the
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Water has many unique properties that make life possible on Earth. One property is cohesion. The cohesion property is properly defined as the binding of water molecules by hydrogen bonds. Water has this property as a result of the chemical bonding between water. Cohesion of the strong hydrogen bonds allows the water molecules to stick together‚ almost as a unit of one. A force exerted on one of the molecules will be exerted on all of the adjacent molecules as a result of cohesion. Cohesion‚ often
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06_0610_03/3RP UCLES 2005 [Turn over 2 1 Three plants were grown to study the effects of nitrate and magnesium ion deficiency on their development. They were kept in the same conditions‚ except for the types of minerals supplied. Plant A was provided with all essential minerals. Plant B was given all minerals except nitrate ions. Plant C was given all minerals except magnesium ions. Fig. 1.1 shows the plants a few weeks later. For Examiner’s Use normal‚ healthy leaf pale green leaf
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Vinegar as Alternative Battery An Investigatory Project Presented to The Faculty of the High School Department Surigao Education Center Km. 2‚ Surigao City _______________________________________________ In Partial Fulfillment of the Requirements in Physics IV _______________________________________________ By: Edradan‚ Dhaniel Jefferson Yaun‚ Mary Allyssa Concon‚ Leonel Galos‚ Jancirfil Jimena‚ Rimar Villarojo‚ Kerr March 2013 APPROVAL SHEET Vinegar as Alternative Battery Prepared &
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Catalytic reduction of hexacynoferrate (III) The silver nanoparticles were used in the catalytic electron transfer reaction between hexacyanoferrate (III) and sodium borohydride‚ resulting in the formation of hexacyanoferrate (II) ions and dihydrogen borate ions. The redox reaction is depicted as: [BH4] - + 8[Fe (CN) 6] -3 + 3H2O H2BO3 - + 8[Fe (CN) 6] -4+ 8H+ The reaction can even proceed without a catalyst‚ but it has been reported that it is a slow reaction‚ which follows zero-order
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10.34 Use the electron-pair repulsion model to predict the geometry of the following molecules: a. GeCl2 b. NF3 c. SCl2 d. XeO4 10.35 Predict the geometry of the following ions‚ using the electron-pair repulsion model. a. ClO3? b. PO43? c. SCN? d. H3O? 10.36 Use the VSEPR model to predict the geometry of the fol- lowing ions: a. N3? b. BH4? c. SO32? d. NO2? 10.37 For each of the following molecules‚ state the bond an- gle (or bond angles‚ as appropriate) that you would expect to see on the central
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allowing the silver ion and chloride ion to form silver chloride. The overall and net ionic equations for the reaction are as follows: Overall Equation AgNO(aq) + XCl(aq) AgCl(s) + XNO3(aq) Net Ionic Equation Ag+(aq) + Cl-(aq) AgCl(s) Precipitation gravimetry for this experiment was performed by using silver nitrate as the precipitating reagent then digesting the newly formed silver chloride sample in a solution containing ions. Through heating and the high concentration of the ions‚ the silver
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Introduction Butter is a dairy product made by churning of cream‚ mostly from fresh cow’s milk‚ with the additional of salt (Bylund‚ 1995). Salt (Sodium Chloride) is used as flavoring and preservative as it inhibit the microbial growth. Salt content in butter is limited by legislation in some countries. For example‚ in Thailand‚ the maximum sodium chloride content in butter shall not exceed 4 percent of total butter weight (Thai Ministry of Public Health‚ 2001). Therefore‚ analytical methods are
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generally lose electrons to become cations.| 2.|Nonmetals generally gain electrons to become anions.| 3.|Group 2A metals form ions with a 2+ charge.| a.|1 only| b.|2 only| c.|3 only| d.|1‚2‚ and 3| ANS: D OBJ: Goal #3.1: Interpret‚ predict‚ and write formulas for ionic and molecular compounds 5. What charge is most commonly observed for an oxide ion? a.|3-| b.|2-| c.|1-| d.|1+| ANS: B OBJ: Goal #3.1: Interpret‚ predict‚ and write formulas for ionic and molecular compounds
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precipitated and nothing lost. 3) Why don’t you have to weigh the sodium chloride on a sensitive balance? You don’t have to weigh the sodium 4 numbers past decimal because as long as you have an excess of NaCl to get enough Cl ions to precipitate all of the silver ions. So no accurate balance needed 4) Why
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