CHAPTER 4 REVISION 1. How many moles of silver atoms are in 0.780 grams of silver? a) 0.78 moles b) 0.00723 moles c) 84.2 moles d) 0.522 moles 2. What is the molar mass of Mg(BrO4)2? a) 312 g mol-1 b) 232 g mol-1 c) 168.2 g mol-1 d) 477 g mol-1 3. What mass of the compound FeWO4 contains 50.0 grams of tungsten (atomic symbol W‚ atomic number = 74)? a) 30.0 g FeWO4 b) 304 g FeWO4 c) 82.6 g FeWO4 d) 188 g FeWO4 d) FeSO4 4. A compound contains 20.2%
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behavior. It used to be known as Huntington’s chorea because it is the most common genetic disease that is the cause of abnormal twitching. Huntington ’s has an intense effect on patients‚ as individuals gradually lose the ability to reason‚ speak and swallow. Also‚ motor symptoms‚ which affects in problems with walking‚ (Mayo Clinic Staff‚ 2011). Children born to parents who suffer from the disease have a 50% chance of inheriting and developing it. Hence‚ during pregnancy it is possible to find out
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Purpose: The purpose of this lab is to identify the presence of cations and anions in four unknown solutions by identifying whether they are copper‚ silver‚ iron‚ or chloride ions which is done by adding sodium hydroxide‚ solid copper‚ silver nitrate‚ and potassium thiocyanate to the solutions and analyzing the chemical reactions. Introduction: Chemical change‚ unlike physical change is the change in the composition of a substance rather than simply its shape‚ size‚ or state (Marie‚ 2015). Signs
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This lab report is not perfect‚ but can serve as a guide in understanding how to write one! Introduction Insulin‚ an amino-acid based protein‚ helps make up a larger polypeptide chain‚ proinsulin‚ which is located within the beta cells of the pancreas. Enzymes release the insulin from the larger proinsulin chain just before it is secreted from the beta cells. Insulin’s main function is to lower blood glucose levels by speeding up the membrane transport of glucose from the blood and into
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stays at an constant temperature‚ the mass is determent to greater decimal plyces‚ and a more accurate measuring flask. Part two: Conclusion References * Hopton‚ J. 2011 GROUP II ELEMENTS Beryllium to Barium
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Dysphagia is the difficulty or complete inability to swallow (citation). Although it is a very common disorder that can affect all ages‚ is it highly invisible because one cannot depict who is affected by dysphagia and who is not by just looking them. The lives of the individuals who undergo dysphagia are exceedingly affected and impacted in many ways. This short documentary introduces five different individuals who suffer from dysphagia. As there are many different causes of dysphagia‚ the individuals
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Test tube Corrosive on skin and toxic if swollen Wear goggles and a lab coat to prevent physical contact Immediately flush eyes with large amounts of water for at least 30 minutes and lift lower and upper eyelid as you are showering the eye. Barium chloride Test tube Toxic to the gut Avoid skin and eye contact. Avoid inhalation or ingestion of the powder. ¬ immediately wash Skin‚ eyes or the affected area with large amounts of water until all evidence of the chemical has been removed (approximately
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his beautiful statue was decorated with gold and jewels and fixed so high that he could see all the ugliness and misery of his city. Thus‚ he requested his messenger‚ the little Swallow‚ who was planning to go to Egypt‚ to take his gold and jewels to the poor. Soon afterwards‚ his statue became shabby and unwanted; the Swallow died because of coldness. Nevertheless‚ the prince’s heart and the dead bird were chosen to the Heaven. The author has personified the Happy Prince’s statue as a real man by
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emergency room complaining of severe pain in her left iliac region. She claims previous episodes and says that the condition is worse when she is constipated‚ and is relieved by defecation. A large‚ tender mass is palpated in the left iliac fossa and a barium study reveals a large number of diverticula in her descending and sigmoid colon. What are diverticula‚ and what is believed to promote their formation? Does this woman have diverticulitis or diverticulosis? Explain. The Woman has
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Class 4 – Flammable Solids Division 4.1 – Flammable Solids are: • Wetted explosives that are Class 1 explosives when dry‚ that are sufficiently wetted to suppress explosive properties. • Self-reactive materials that are thermally unstable and can undergo strong exothermic decomposition even in the absence of oxygen. Readily combustible solids that can cause fire through friction‚ such as matches. Powdered‚ granular or pasty materials must be classified as Division 4.1 when the time of burning of
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