BRIGGS RAUSCHER OSCILLATING CLOCK COURSEWORK Aim: To investigate the effect of temperature on the rate of reaction. To investigate the order of reaction with respect to hydrogen peroxide and ethanoic acid (acetic acid) by the use of an oscillating clock reaction. To determine the activation enthalpy with and without catalytic ions and use this to compare the effectiveness. To investigate the rate equation‚ rate constant and possible mechanism for this reaction. Background research: The Briggs-Rauscher
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increasing the concentration of KIO3‚ 0.15M concentrations resulted in times of 45.77 and 150.47 when tested twice which was unexpectedly higher than 13.68s at a concentration of 0.1 (Table 1). Similarly‚ raising the concentration of NaHSO3 decreased the clock period with the exception of the 0.2M concentration as it had the lowest time of 15.39s when 0.4M was expected to be lower (Table 2) These inconsistencies for the concentration data may have been due to measurement errors during the experimental process
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Discuss the disruption of biological rhythms 24m One example of disruption of biological rhythms is due to shift work and shift lag. This disrupts your sleeping pattern because it means you are required to be alert at night‚ so need to sleep during the day. This reverses and disrupts your circadian rhythm‚ becoming desynchronised where it is no longer entrained by EZ’s. There are many consequences of desynchronisation such as sleep deprivation. Shift workers find it hard to sleep during the day
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1. Biological psychologists are gaining a better understanding of our experiences of sights and sounds‚ meanings and memories‚ pain and passion. Franz Gall invented phrenology‚ a popular theory that claimed that bumps on the skull reveal our mental abilities and our character traits. Although wrong‚ this information revealed that various brain regions have specific functions. 2. A neuron consists of a cell body and branching fibers:The dendrite fibers receive information from sensory
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worked on different areas of businesses including: customer service‚ sales‚ supply chain management‚ accounting‚ finance and recruiting. Currently‚ I lead a family business as General Manager. But the experience I want to focus on is the “off-the-clock” one: volunteering. I have volunteered for many social causes for most of my life including: academic reinforcement in public schools; building emergency houses with TECHO Nicaragua; and most recently‚ I am leading a project to collect books and create
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Lab #3: Method of Initial Rates: Iodine Clock Introduction The detailed system of steps in a reaction is called the reaction mechanism‚ and it is one of the principal aims of chemical kinetics to obtain information to aid in the elucidation of these mechanisms in order to better understand chemical processes. Reactions usually occur in a stepwise manner with each step proceeding at a different speed. If the rate of reaction is slow enough to measure‚ this is indicative of a step much slower
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ROLE OF NEUROTRANSMITTERS IN LEARNING AND MEMORY – Martinez and Kesner (1991) Aim: determining the role of the neurotransmitter acetylcholine on memory Method: * Rats were trained to go through a maze and get to the end‚ where they received food * Researcher injected one group of rats with scopolamine (blocks acetylcholine receptor sites thus decreasing available acetylcholine) * Injected second group of rats with physostigmine (blocks the production of cholinesterase – cholinesterase
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Outline and evaluate the biological therapies for phobic disorders (8+16) One biological therapy for phobic disorders is chemotherapy. Drug therapies include Anti-Anxiety drugs‚ Beta blockers and Antidepressants. They aim to alter abnormal behaviour by intervening directly in bodily processes (helps with the symptoms).Those that experience psychological problems or show disturbed behaviour patterns go to their family doctors. The first line of treatment is medical. Drug therapies are most common
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The Biological Approach One of the most perplexing issues in psychology is understanding the relationship between the mind and the brain. We all recognize that we have conscious awareness of our surroundings‚ and also of ourselves (self-awareness). It is this experience which has normally been described as the mind. But what is the basis of the mind? Is it the expression of a non-physical soul‚ or is it a product of physical processes within our body? Philosophers and scientists have been pondering
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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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