variation amongst colours/patterns of individuals is extensive. The New Zealand variety of slaters range from several millimetres to upwards of 2 cm in length (most common length being between 1-1.5 cm). The exoskeletons of slaters are comprised of calcium carbonate making them quite rigid. The body is separated into 3 distinct regions; head‚ thorax and abdomen‚ however far less distinguishable than insects. The head is composed of a complete shield-like segment of shell with two sets of antennae‚ though
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Selective precipitation of the Barium Magnesium Group Chem 112-004 Abstract The purpose of this experiment is to separate and identify the cations of Ba+‚Sr2+‚Ca2+‚ Mg2+ and NH4+ using differences in solubility and confirming test to identify the unknown solution used in this experiment. In this experiment the methodology used by the group is to perform the tests for both the unknown and the cations (Ba+‚Sr2+‚Ca2+‚ Mg2+ and NH4+) using the known as a control for comparison and identification
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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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of a Mixture of sand and copper salt • In a test tube stir 2 g of sand copper and 5ml of water. • In a hot plate heat up the beaker with the supernatant until water is evaporated. Separation of a Mixture of sand‚ calcium‚ and copper • In a beaker add 3g of sand‚ calcium‚ copper and deionized water and stir until copper dissolves. • Put a filter paper into a funnel‚ then pour the mixture into the filtering apparatus letting it drop into a beaker. • Transfer the solid from the filter paper
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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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The Earthquake-Resilient Building The Brilliant Idea: A replaceable‚ building-wide system to help hospitals‚ apartment buildings and office towers survive severe seismic shaking. By Logan Ward and the Editors of Popular Mechanics September 30‚ 2010 6:30 AM Elastic high-strength steel cables run down the center of the system’s frame. The cables control the rocking of the building and‚ when the earthquake is over‚ pull it back into proper alignment. A steel frame situated around a building’s
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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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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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