could also be influenced by price‚ attractiveness of packaging and whether or not the medication can be conveniently carried. Q4. Many antacids fizz when dissolved in a glass of water. One such brand lists among its ingredients‚ sodium hydrogen carbonate and citric acid. Write an ionic equation for the reaction between HCO3–(aq) and H3O+(aq) responsible for the ‘fizz’. A4. HCO3–(aq) + H3O+(aq) → CO2(g) + 2H2O(l) Q5. In each of the following equations: i identify the acids and bases ii name the conjugate
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Subject Content Most of the objectives specified in this section relate to Knowledge with Understanding‚ although some indication has been given as to where the skills of Handling Information and Solving Problems may be developed. Teachers are reminded that‚ in the written papers‚ 40% of the marks are allocated to these higher ’thinking’ skills. In almost every section‚ students should therefore be given practice at dealing with unfamiliar situations so that these higher thinking skills can be developed
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Sodium chloride‚ also known as salt‚ common salt‚ table salt‚ or halite‚ is an ionic compound with the formula NaCl. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms. As the major ingredient in edible salt‚ it is commonly used as a condiment and food preservative. [edit] Properties Thermal conductivity of pure NaCl as a function of temperature has a maximum of 2.03 W/(cm K) at 8 K and decreases to 0.069 at 314
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formulation P6 exhibited the highest lag time (219 s) (Table 5.4) (Figure 5.1 and 5.2). The decrease in the buoyancy lag time of a formulation P1 can be attributed to the availability of an increase amount of carbon dioxide with concentration of calcium carbonate which was entrapped in the formed gel to give rapid buoyancy. Irrespective of formulation variables‚ buoyancy duration was >12
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hard when there are high concentrations of the divalent cations Magnesium and Calcium; water hardness is considered as the sum of both the calcium and magnesium concentrations and expressed as calcium carbonate in milligrams per liter (mg/L).1 Hard water requires more soap and synthetic detergents for home laundry and washing‚ and contributes to scaling in boilers and industrial equipment. Calcium and magnesium carbonates tend to be deposited
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soluble in water than the corresponding alkali metal salts. Some are even so insoluble that they resist weathering and leahcing action in rainwater. Its common oxidation states is 2. Magnesium forms many compounds. The oxide‚ hydroxide‚ chloride‚ carbonate‚ and sulfate are commercially important. They are used in ceramics‚ cosmetics‚ fertilizers‚ insulation‚ leather tanning‚ and textile processing. Common Uses . The coating protects the metal‚ particularly magnesium‚ from further oxidation
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The speed of chemical reactions – class experiment By Julia Shuker Year 10 science – Miss Phillips – Term 2 – 2013 – Julia Shuker Aim The aim of the experiment was to investigate the factors that increased or decreased the speed of chemical reactions between two different chemical reactions. Hypothesis If certain factors‚ such as concentration‚ temperature‚ catalyst and surface area are increased then the reaction rate will also increase due to the particles
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Materials required Materials list Test tubes‚ Water‚ small beacon‚ Pipette‚ Stand‚ Mortar‚ green leaves‚ Filter paper‚ capillary tube‚ funnel‚ silicon dioxide‚ calcium carbonate‚ acetone‚ solvent. Method 1) To extract pigments from green Leaves - Weigh 5g green Leaves‚ cut into pieces‚ and put in mortar. - Add silicon dioxide + calcium carbonate + 5ml acetone and grind (Try not to inhale fumes) - Pour the
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looking at the solubility rules‚ my results were what I expected them to be. I found that sodium chloride did not react with any of the five substances and that the sodium sulfate only reacted with the barium nitrate. The sodium bicarbonate‚ sodium carbonate as well as the sodium hydroxide reacted with all five substances. This was expected because the solubility rules stated that these were all insoluble substances. I was careful to add exactly two drops of each into
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BINARY COMPOUNDS -Compose of two kinds of atom Polyatomic Ion | Name | OH-1 | hydroxide | SO4-2 | sulfate | PO4-3 | phosphate | NO3-1 | nitrate | CO3-2 | carbonate | HCO3-1 | hydrogen carbonate or bicarbonate | ClO3-1 | chlorate | NH4+1 | ammonium | TWO NON-METALS - Give the name of the positive ion followed by the negative ion ending with -ide -Greek prefixes are used CO-carbon monoxide CO2-carbon dioxide NO-nitrogen
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