momentum of the object over a long time D. Increase the momentum of the object over a long time 8. Most street barriers are made of hard rubber or plastic materials that easily give in or dent when hit. Why is this so? A. To reduce the vehicle’s kinetic energy when it collides with the barriers B. To store potential energy in the bumpers of vehicles C. To reduce the impact force when hit by a vehicle D. To reduce the impact time when the barriers hit the vehicle 9. What is the momentum of a 20
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Gabriella Posess AP Chemistry- Period C 11/24/11 Iron Complex Lab Purpose: Be able to tell the difference between iron (II) and iron (III) solutions by performing redox reactions between irons oxidation states. Materials: test tube rack 6 test tubes- 25 x150 mm 25 mL graduated cylinder 6 stoppers 6 mL distilled water 6 mL Iron (III) chloride solution (0.02M FeCl3 x 6H2O) 6 mL Iron (II) sulfate solution (0.02M FeSO4 x 7H2O) 1 drop Potassium ferricyanide solution(0.1M K3Fe(CN)6)
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negative ions B. positive ions surrounded by freely moving electrons C. molecules held together by covalent bonds D. atoms held together by covalent bonds Question 2. Which of the following is not a property of most metals? A. Malleable B. Good electrical conductors C. Poor thermal conductors D. Shiny appearance Question 3. An alloy of iron and carbon which contains 4% carbon is likely to be A. weaker and more malleable than pure iron B. weaker and more brittle than pure iron C. stronger
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Experiment 16: Kinetics: The Iodine Clock Jane Smith Purpose: The objective of this experiment was for students to apply their knowledge of kinetics and rate laws in order to determine the rate of a chemical reactions‚ activation energy‚ and frequency factors of those reactions. Specifically‚ this experiment was performed using a series of solutions with varying concentrations of KI‚ Na2S2O3‚ and (NH4)2S2O3 . Students recorded time elapsed to observe physical evidence of a reaction taking place
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Analysis of an Iron-Copper Single Replacement Reaction Martin Sun Purpose The purposes of this experiment were to: determine the number of moles of iron reacted; determine the number of moles of copper produced; and calculate the ratio of moles of copper to moles of iron. Materials and Methods Materials and methods for this laboratory followed those laid out in Experiment 6A on pages 56-59 of Essential Experiments for Chemistry by Morrison and Scodellaro with the following exceptions: one iron nail was
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Determination of Iron by Reaction with Permanganate-A Redox Titration Purpose: The purpose of this experiment was to find the percentage of iron in an unknown iron oxide sample which could be determined through titration with a standard solution of potassium permanganate. Success in this analysis requires careful preparation and attention to detail. Performing this experiment also provides practice at titrations. The overall reaction is: 8H+(aq) + MnO4-(aq) + 5e- Mn2+(aq) + 4H2O Theory:
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Introduction When iron is mixed to Copper (Ⅱ) Chloride; the product will be copper and iron chloride. However‚ in this experiment‚ we do not have the information of the oxidation number for iron nails. There are 2 different oxidation numbers for iron; that are 2 or 3. We will need to check each of the equations to find out the moles of each element in the equation. Then we can compare the ratio between the mole and the mass of iron and copper; that will be measured during the experiment. Finally
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Investigation - Solution Colour and Ion Concentration Aim: To investigate whether solution colour can be used to reliably determine the concentration of coloured ions in a solution. Hypothesis: the concentration of permanganate ions in the solution is inversely proportional to the percentage transmission of light through the solution. Dependent variable: concentration of permanganate ions. Independent variable: percentage transmission of light through the solution. Equipment: 20 ml
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Unmasking the Iron Veil The Salem Witch Trials and McCarthyism are two very different time periods in which the persecution of others‚ based on religion or party affiliation‚ happened. These two eras occurred two centuries apart‚ yet both are very similar. The constant fear and chattering of rumors induced hysteria and paranoia within both societies. It makes you wonder if we‚ as a society‚ can accept others who are not described as normal? Or can we even accept those who are different and not judge
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Iron (Fe) Deficiency i*n *Cyanobacteria Fe in cyanobacteria serves as an essential redox component important to diverse metabolic pathways. Fe-rich systems in cyanobacteria such as the photosynthetic apparatus and the respiratory electron transport system are dependent on Fe supply (Raven et al.‚ 1999). Other important cellular processes such as nitrogen assimilation (Raven‚ 1988)‚ ribonucleotide synthesis‚ chlorophyll synthesis and oxygen radical detoxification are also Fe dependent. Prokaryotes
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