Gerona‚ Evelyn Chemical Reactions Experiment No. 7 Date Performed: Feb. 17‚ 2014 Date Submitted: Feb. 24‚ 2014 Mrs. Vitancol I. Theoretical Framework A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Classically‚ chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms‚ with no change to the nuclei (no change to the elements present)‚ and can often
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a decomposition reaction could be a redox reaction. The electrolysis of water is a redox reaction. With a direct electric current through it‚ water can be separated into oxygen and hydrogen. H2O H2 + O2 The oxygen and hydrogen in the water are attached by a covalent bond that breaks to make the element oxygen and the element hydrogen. Learning more about the conditions for redox reactions will show that the electrolysis of water is a redox reaction. A single replacement reaction is always a redox reaction
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1 (a) In this apparatus hydrochloric acid is decomposed by passing a direct electric current through it. Chlorine and hydrogen are formed. (i) Give the name of this process in which substances‚ such as hydrochloric acid‚ are decomposed by a direct electric current. (1) electrolysis (ii) Describe what happens when a burning splint is applied to a mixture of hydrogen and air in a test tube. (2) (b) (i) Complete the sentence by putting a cross ( ) in the box next to your answer. An acid
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of the same element that differ in their mass number because they have different numbers of neutrons in their nuclei (atomic # will still be the same) Ex. U-235 235 - 92 = 143NO Mass: 235 Protons – Mass = Neutrons 92P+ Isotopes of Hydrogen Hydrogen –1 proton‚ no neutrons Deuterium (heavy water) – 1 proton‚ 1 neutron Tritium
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this lab was the convert liquid methyl oleate to solid methyl stearate by catalytic hydrogenation. Firstly‚ we produced hydrogen gas using solid mossy zinc and sulfuric acid. Using the hydrogen produced in the previous reaction‚ we were able to convert the liquid methyl oleate to solid crystals of methyl stearate. A mineral oil was also used to bubbler was used to maintain the hydrogen pressure slightly above the atmospheric pressure and to prevent back-diffusion of air into the system. An initial zinc
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SBI4U-C 1 Lesson Introducing Biochemistry 1 Lesson 1 Biology SBI4U-C Introduction If you think about it‚ living things are made up of chemicals. The cells‚ tissues‚ organs‚ and organ systems that together make up a functioning organism are all the product of interacting chemicals. In order to understand how the organism functions‚ you must also recognize how these chemicals function. The study of the chemicals that are involved in living things is known as biochemistry
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Neutralization with a base weaker than the acid results in a weakly acidic salt. An example is the weakly acidic ammonium chloride‚ which is produced from the strong acid hydrogen chloride and the weak base ammonia. Conversely neutralizing a weak acid with a strong base gives a weakly basic salt sodium fluoride from hydrogen fluoride and sodium hydroxide. Acids are often used to remove rust and other corrosion from metals in a process known as pickling. They may be used as an electrolyte in a wet
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ARTICLE IN PRESS Energy 32 (2007) 431–436 www.elsevier.com/locate/energy Hydrogen production by advanced proton exchange membrane (PEM) water electrolysers—Reduced energy consumption by improved electrocatalysis A. MarshallÂ1‚ B. Børresen‚ G. Hagen{‚ M. Tsypkin‚ R. Tunold Department of Materials Technology‚ Group of Electrochemistry‚ NTNU‚ 7491 Trondheim‚ Norway Received 14 October 2005 Abstract Proton exchange membrane (PEM) water electrolysis systems offers several advantages over traditional
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experiment I will investigate the relationship between the concentration of the hydrochloric acid and the rate of a reaction. To find this out I will react different concentration of hydrochloric acid and magnesium‚ from there I will monitor the gas (hydrogen) produced and analyse the results. Prediction: I predict the higher the molarity of the hydrochloric acid the faster the rate of reaction therefore the quicker the gas will be produced in the specific time interval. Overview of the experiment:
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newspapers or news broadcasts. One of the most concerning pollutant in the Hudson River is polychlorinated biphenyls (PCBs). According to the US Environmental Protection Agency : PCBs are a group of man-made organic chemicals consisting of carbon‚ hydrogen and chlorine atoms. The number of chlorine atoms and their location in a PCB molecule determine many of its physical and chemical properties. PCBs have no known taste or smell‚ and range in consistency from an oil to a waxy solid. PCBs belong to
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