N11/4/CHEMI/SP2/ENG/TZ0/XX 88116105 CHEMISTRY STandaRd lEvEl PaPER 2 Monday 7 November 2011 (afternoon) 1 hour 15 minutes INSTRUCTIONS TO CANDIDATES • • • • • Candidate session number 0 0 Examination code 8 8 1 1 – 6 1 0 5 Write your session number in the boxes above. Do not open this examination paper until instructed to do so. Section A: answer all questions. Section B: answer one question. Write your answers in the boxes provided. 19 pages © International Baccalaureate Organization
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kirsty jones 32251 8151 Edexcel GCSE Chemistry/Science Unit C1: Chemistry in our World Foundation Tier Sample Assessment Material Time: 1 hour You do not need any other materials. Paper Reference 5CH1F/01 Total Marks Instructions Use black ink or ball-point pen. Fill in the boxes at the top of this page with your name‚ centre number and candidate number. Answer all questions. Answer the questions in the spaces provided – there may be more space than you need. Information The total mark for
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How do the total masses of the reactants and products compare?______________equal_________________ Section 11.1 continued In your textbook‚ read about mole ratios. Answer the questions about the following chemical reaction. sodium iron(III) oxide → sodium oxide iron 6Na(s) Fe2O3(s) → 3Na2O(s) 2Fe(s) 15. What is a mole ratio? A mole ratio is a ratio
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then fuse them in the melting pot of 130O-140OnC‚ and finally cool them into solid soluble glass. Considering the differences of alkali metal oxide‚ soluble glass can be divided into sodium silicate and potassium silicate‚ and sodium silicate is often used. Among the components of sodium silicate (Na2O*nSiO2)‚ the ratio of silicon oxide molecules to sodium oxide molecules is known as the module of soluble glass‚ generally between 1.5 to 3.5. And the number of module decides the properties and performance
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this vitamin with tables 8.2 and 8.3 the daily value listed on the vitamin label meets the daily value on the tables. There were a few that have a lower percentage such as Vitamin A 3‚500 IU‚ K 10mcg‚ Biotin 15mcg‚ Calcium 108 mg‚ Phosphorus 50 mg‚ Magnesium 40 mg‚ Manganese 1 mg‚ Chromium 20 mcg‚ and Molybdenum 20 mcg. Because my diet is not filled with vitamin and mineral rich foods‚ taking a multivitamin helps me get the right amounts of vitamins that I need daily. And because the water soluble
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explode. It reacts with non-metallic elements except for nitrogen‚ oxygen‚ noble gases‚ silicon and halogens. It oxides them to their highest oxidation states(3) as acids with the formation of nitrogen dioxide for concentrated acid and nitric oxide for dilute acid. Chromium (Cr)‚ iron (Fe) and aluminium (Al) dissolve in dilute nitric acid‚ which the concentrated acid forms a metal oxide layer that protects the metal from further oxidation‚ and it is called passivation. Nitric acid can be made
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experiment. Keeping that in mind‚ I checked the information of each reactants and products on online resources. Not only did that help me realize the Aluminum was oxidized‚ it helped me understood that the product was the gray Copper (II) Oxide instead of the red Copper (I) Oxide. This was one of the problems that I was able to solve by careful observation and checking additional
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help our bodies to maintain its daily functions. Iron‚ for an example is a very important mineral. This particular mineral is needed in the body because this would put us at risk of having anemia. Other minerals sources are calcium‚ phosphorus‚ and magnesium‚ which are needed for the bones. There are other minerals such as fluoride‚ which is important for the teeth as well as the bones. Then there is iodine‚ which is needed for the synthesis of the thyroid hormones. The other sources of minerals are
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exhaust gases is hazardous to people’s health and is one of the major problems in our cities. Pollutants‚ especially nitrogen oxide (NOx)‚ increase the risk of airway infections and can also impair the function of an airway. The largest quantity of NOx is emitted from road traffic and thus in the direct surrounding of the people. Especially in summer‚ these nitrogen oxides are the reason for formation of harmful to health ozone in near-ground layers. This nano-crystalline titanium dioxide is a photo
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population‚ is factors contributing toward the growing air pollutants. In today’s time it is critical that solutions must be found to better the air. The main and major air pollutants found in most city areas are carbon monoxide‚ nitrogen oxides‚ sulfur oxides‚ hydrocarbons‚ and particulate matter‚ liquid or solid form. These pollutants are isolated throughout the world’s atmosphere in areas high enough to increasingly cause serious health risks. Serious health problems can take place rapidly when
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