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 atoms increases down the group Physical properties of Group II metals Ionization The process of removing an
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strontium and barium Calcium sulphate is sparingly soluble‚ and you can think of strontium and barium sulphates as being insoluble. That means that you will get a layer of insoluble sulphate on all of these which will slow down the reaction or stop it entirely. In the calcium case‚ you will get some hydrogen produced together with a white precipitate of calcium sulphate. -------------------------------------------------------------------------------- Note: With strontium and barium‚ I have
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prior to x-ray In regular x-rays‚ soft tissue cannot be seen clearly. Contrast media is therefore used to examine organs or the circulatory system more closely. To bring organs in the digestive and endocrine systems into focus‚ a patient will swallow a barium compound. This allows organ function to be seen‚ e.g. in GIT studies. To examine blood vessels‚ contrast media can be injected straight into the patient’s bloodstream‚ e.g. in angiography 7) Outline the difference between projection radiography
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solubility rules my results proved accurate. Just by 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
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from heat‚ sparks‚ open flames‚ and hot surfaces. Magnesium Nitrate may cause skin and serious eye damage‚ corrosion or irritation also it is very flammable. Calcium Nitrate Is very reactive and a oxidizer‚ It will also irritate any contact point. Barium Nitrate and Strontium Nitrate also have similar affects to exposed skin and they are also oxidizers. III. Pre-Lab Questions- What are the group 1 elements called‚ they are called alkali metals. List the group one elements‚ Hydrogen‚ Lithium‚ Sodium
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tests: Barium chloride Calcium chloride Copper (II) chloride Magnesium chloride Potassium chloride Sodium chloride Unknown solids containing a single cation and labelled X‚ Y and Z Apparatus: Bunsen burner Insulation mat Platinum wire (or Nichrome wire)‚ Watch glass Safety precaution: As concentrated hydrochloric acid is corrosive‚ skin contact should be avoided. It is preferable to use polythene gloves and wear goggles while handling it. Copper (II) chloride and barium chloride
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Hydrogen Peroxide & Inorganic Peroxy Compounds Hydrogen Peroxide Hydrogen peroxide (H2O2) is the simplest peroxide (a compound with an oxygen-oxygen single bond). It is also a strong oxidizer. Hydrogen peroxide is a clear liquid‚ slightly more viscous than water. In dilute solution‚ it appears colorless. Reactions Decomposition Hydrogen peroxide decomposes exothermically into water and oxygen gas spontaneously: 2 H2O2 → 2 H2O + O2 This process is thermodynamically favorable. It has
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During fracturing‚ these two ores can be dissolved‚ allowing for the ions to flow downstream into the rivers and lakes‚ resulting in exceedingly high barium levels in the water. This can cause high amounts of contamination in not only the lakes but drinking water reservoirs. Three separate trials were conducted using the colorimeter and a BariVer Barium Reagent Powder Pillow mixed with the water sample. The tests produced results of 2 mg/L‚ 1 mg/L‚ and 1 mg/L. It was decided that another test must be
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the concentration of reactants increases which causes the equilibrium system to move to the right (products) side. Therefore‚ the solution turns purple. 6) Cr2O72- + 2OH- ↔ 2CrO42- + H2O 9) In step 7‚ there was HCL added prior to the addition of barium nitrate and this caused the reaction to shift right causing the production of additional dichromate. This meant there was a
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Survey of the Sciences Unit 4: The Science of Fireworks 7-7-14/7-14-14 What is a firework? An explosive or combustible used for display. In the 19th century the introduction of new ingredients such as magnesium and aluminum greatly heightened the brilliance of such displays. There are two main classes of fireworks‚ force-and-spark and flame. In force and spark compositions‚ potassium nitrate‚ sulfur‚ and finely ground charcoal are used‚ with additional ingredients that produce various types
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