Chemistry

Can we accept the new definition of the Kilogram based on Planck’s constant?

Abstract For the past 130 years, the Kilogram as a unit of measurement was defined by the International Prototype Kilogram. This was replaced in 2019 by a fundamental physical constant, namely Planck’s constant. The re-definition of the Kilogram in terms of this new constant has been highly controversial, splitting scientists into two main camps. The …

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Turning the Periodic Table upside down: Easier?

(Inspired by the official article of Martyn Poliakoff and Ellen Poliakoff) Abstract The periodic table is an output of huge dedications of many scientists like Lavoisier, Dobereiner, Newland, Moseley, and so on. Around 150 years before Dimtri Ivanovich Mendeleev first built up his form of the periodic table. It was successful enough, especially in predicting …

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Noble Gases: “Monoatomic Substances” or “Monoatomic Molecular Substances”?

  Abstract Recently, views are rising among some teachers that noble gases should be understood as “existing in the form of monoatomic molecules\’\’ instead of just “separate atoms”. Undoubtedly, this has made students confused when trying to understand the properties of noble gases. To evaluate the two notions, this article first reviews historical discussions around …

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The Effects of Habitual Caffeine Consumption on Stress in Lab Mice

Abstract Caffeine in the form of soda, coffee, and supplements is widely consumed by many people on a daily basis and in some cases has been linked to feelings of psychological stress. This experiment investigated the effect of habitual caffeine consumption on cortisol levels as they relate to psychological stress in lab mice. It was …

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Why is ‘octasulphur’ the most stable form of sulphur?

Figure 1: sulphur Molecule   Abstract: The periodic table is composed of 118 discovered elements. Each of them has unique properties differentiating it from the other. However, elements can be classified into different categories based on some specific criteria. One of the most common ways of classifying elements is as metals, nonmetals and metalloids. Sulphur …

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Investigating the temperature dependence of the fluorescence emission of quinine in tonic water using a homemade combined UV photometer and fluorescence spectrometer

Maximilian C Harvey Summer 2020 Contents 1 Abstract 3 2 Introduction 3 3 Preliminary theory 3 3.1 Introduction to fluorescence . . . . . . . . . . . . . . . . . . . . . 3 3.2 Examples of fluorescence . . . . . . . . . …

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Optimal Paper Hydrolysis Methodology for Bioethanol Production

Abstract The world has a large demand for fuel, and in particular, environmentally friendly fuels such as bioethanol. There has been a growing interest in using paper as a feedstock for bioethanol production, as this generates a two-fold effect of both removing waste from landfills and meeting global energy needs. Paper undergoes acid-based or enzymatic …

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Century eggs: What are they?

Abstract Century eggs are one of the traditional delicacies originating from China. This research investigated the difference between traditional and industrial methods of making century eggs, through various factors such as the number of steps required and time required for century eggs to complete their formation. Secondary to this comparison, the chemical process and scientific …

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Aerobic Respiration and Anticancer Treatment

Abstract This article is an overview of aerobic cellular respiration and how the process can be influenced by glycolytic inhibitors as a potential cancer treatment.In the presence of oxygen, glucose undergoes a series of reactions characterised by the overall term “aerobic respiration” in order to synthesise ATP, which is crucial to muscle contraction and movement. …

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