5.1 Physical Characteristics of Water 1. Pure water = colourless, tasteless, odourless 2. Exists in3 states – Solid, Liquid, Gas 3. Pure water – boils at 100C, freeze at 0C 4. Density = 1g/cm3 at 4C 5. Water turns (i) white anhydrous copper (II) sulphate blue (ii) blue cobalt chloride pale pink Effects of Impurities in Water 1. Impurities – increase water boiling point (>100C), decrease water freezing point (<0C) 5.2 The composition of water 1. Pure water
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review 7.1 a-acid b- acid c- acid d-base 7.3 a-hydrochloric acid b-calcium hydroxide c-carbonic acid d-nitric acid e-sulfurous acid 7.5 a- Mg(OH)2 b-HF c- H3PO4 d- LiOH e- Cu(OH)2 7.7 a- HI is the acid and F- is the base b- H20 is the acid and f- is the base 7.9 a- F- fluoride ion b-OH- hydroxide ion c- HCO3- bicarbonate ion d- So42- sulfate ion 7.11 a- HCCO3- bicarbonate ion b- H3O+ hydronium ion c- H3PO4 phosphoric acid d- HBr hydrobromic
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WHAT IS ACID ? An acid (from the Latin acidus/acēre meaning sour[1]) is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals (like calcium) to form salts. Aqueous solutions of acids have a pH of less than 7. A lower pH means a higher acidity, and thus a higher concentration of hydrogen ions in the solution. Chemicals or substances having the property of an acid are said to be acidic
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Replication Strategies in Mobile Databases Yahia Mahgoub Yahia, Mohamed Elamin Mohamed, Abd Allah Ibrahim, and Ayman Suliman Abstract - With the revolution of mobile computing today mobile devices have become part of each person life lead to a wireless computing environment. Mobile computing has enabled the introduction of new applications, ranging from simple ones such as mobile games to those quite complex applications such as mobile banking and mobile multimedia. With these applications people
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States of Matter Gases, liquids and solids are all made up of microscopic particles, but the behaviors of these particles differ in the three phases. The following figure illustrates the microscopic differences. | | | Microscopic view of a gas. | Microscopic view of a liquid. | Microscopic view of a solid. | Note that: * Particles in a: * gas are well separated with no regular arrangement. * liquid are close together with no regular arrangement. * solid are tightly
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“ Spanner : Google’s Globally – Distributed Database “ Spanner is a NewSQL created by google. It is a distributed relational database that can distribute and store data in google’s big table storage system in multiple data centers. Spanner is Google’s scalable, multi-version, globally distributed, and synchronously-replicated database. It is the first system to distribute data at global scale and support externally-consistent distributed transactions. Spanner provides the scalability that
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on them. This study was preformed to find out which substance on the suspects matched the one surrounding Professor Chemback. The suspects include Butch, Susie, Joe, Jack, and Sylvia. Butch had flour on him, Susie had sugar, Joe had salt, Jack had acid, and Sylvia had baking soda. Materials and Methods Materials needed: 1. 5 beakers containing the known substances 2. 1 beaker containing the unknown substance 3. 2 beakers for testing 4. 2 stirring rods 5. 2 well plates
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Laboratory Exercise Two Reaction Enthalpies for Acid – Base Neutralization Reactions Goals 1. To measure the amount of heat released in acid-base neutralization reactions. 2. To determine the molar enthalpy change for each acid-base neutralization reaction. 3. To validate Hess’s Law using the experimental results. Background Information Acids and bases react together to produce a salt and water as shown in the following reaction. HCl(aq) + NaOH(aq) NaCl(aq) + H2O(l) This type of reaction is
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is acidic and anything greater than seven is basic. Seven is neutral with an even concentration of H+ and HO- ions. The farther from the center of the scale a substance is the stronger of an acid or base it is. For example an acid with a pH of one or two is a very strong acid, while a six is a weak acid. As well, a base of thirteen or fourteen is a very much stronger base than that of a pH of eight. The measurements on the pH scale are logarithmic, with each unit representing tenfold change in
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wind up gradually storing large growing amount of waste products (acidic properties or toxins) throughout our body, slowly causing acidification and problems. Another important thing to understand is that acid coagulates blood, thus causing poor blood circulation around the places where acids are accumulated. This in turn causes the conditions of extra cellular fluids, especially the blood, becomes acidic, our physical condition will first manifest tiredness, proneness to catching colds, etc.
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