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Science Essay Examples

Effect of Concentration on the Rate of Reaction

Introduction: In this experiment, we utilized the ability for the iodide ion to become oxidized by the persulphate ion. Our general reaction can be described as: (NH4)2S2O8 + 2KI A I2 + (NH4)2SO4 + K2SO4 (1a) However, we know that in an aqueous solution, all of these compounds except iodine will dissociate into their ionic…

Ecosystems: Ecological Succession and Climatic Climax

Ecosystems: Change and Challenge The Structure of Ecosystems Ecosystem: a dynamic, stable system characterised by the interaction of plants and animals with each other and with the non-living components of the environment The components of an ecosystem are categorised as either biotic and abiotic Biotic means the living environment, components include: i). Vegetation (living and…

Calcium Carbonate and Ca2+ Ions

Experiment. EDTA Titration of Ca2+ in an unknown solution Experiment. EDTA Titration of Ca2+ in an unknown water sample Modified 9/2012 Objective: The most common multivalent metal ions in natural waters are Ca2+ and Mg2+. In this experiment, you will find the total concentration of calcium ions that can react with EDTA with the assumptions…

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Biology Virtual Lab- Parts of a Flower

Tip of the stamen that produces pollen containing sperm| Filament| Slender stalklike part of the stamer that supports the anther| Ovary| Swollen base of the pistil that contains the ovules| Ovule| eggs that develop into seeds after they are fertilized| Petals| Colorful leaflike parts that attract insects and other animals for pollination| Pistil| Structure that…

A Guaiacol Dye-Coupled Reaction Reports That Catalytic Activity of Peroxidase Isolated from Fresh Turnip (Brassica Rapa) Increases as Temperature Rises

Enzymes are proteins which serve to reduce the activation energy required for biological reactions (Russell and others 2010). This allows biologically important chemical reactions to occur rapidly enough to allow cells to carry out their life processes (Russell and others 2010). Enzymes are made of one or more polypeptide strands, which individually or as an…

To Determination the Partition Coefficient of Ethanoic Acid Between Water and Butan-2-Ol

To determination the partition coefficient of ethanoic acid between water and butan-2-ol. Procedure 1. The room temperature was recorded. 2. 15cm3 of the given aqueous ethanoic acid and 15cm3 of butan-2-ol were poured into a 100cm3 separating funnel, using suitable apparatus. The funnel was stoppered and was shook vigorously for 1 to 2 minutes. (The…

Solvent and Double Bond

Theory and mechanism Epoxidation is a reaction of an alkene with a peroxycarboxylic acid (also called peracid) to produce an epoxide product, generally performed in inert solvents, such as dichloromethane. The epoxide product is a cyclic ether in which the ring contains three atoms. The alkene gains an oxygen from the peracid in a syn…

X-ray interactions with matter

This document presents the interactions of x-ray with matter. It talks about the five types of x-ray interactions with matter, photoelectric absorption, compton scattering, pair production, coherent interaction, and photodisintegration. Each of this x-ray interactions are discussed in a manner that it can be understood by the general public. This document also dwells on the…

Phytochemical Analysis of Amaranthus Viridis L.

A Biological Research Submitted to the Research Center Alabel National Science High School Regional Science High School for Region XII Alabel, Sarangani Province Submitted by: Shaira Mae M. Yamon Fourth Year- Diamond Submitted to: SHIELA P. BUTIL, Ph. D. Research Adviser August 5, 2013 ? Chapter I Introduction A. Background of the Study Amaranth (Amaranthus)…

Introduction to Flood Routing

The Muskingum flow routing method has been very well researched and established in the hydrological literature. Its modest data requirements make it attractive for practical use. The paper gives a general overview of the Flood routing concept and types, and then goes on to explain the Muskingum method in detail. Introduction to Flood Routing Flood…

bio lab pill bug

What are the Effect of Different Environments and the Movement of Pill Bugs? Purpose: The purpose of this lab was to analyze pill bugs activity in different environments and determine the effect of wet/dry or dark/light environments have on them and how taxis takes place in their choices in living in areas. Background information: Terrestrial…

Experiement to test for anions and cations

The aim of the experiment is to test an unknown substance with a variety of experimental methods, by doing this the identity of the substance will be known. The two types of different testing methods will be anions and cations. Cations are positively charged ions; this is because the atom looses an electron during a…

Hibiscus rosa-sinensis Essay

The species of hibiscus which seems to hold the greatest figure of discrepancies is Hibiscus rosa sinensis. These workss appear to hold countless fluctuations in coloring material and form in both individual and dual signifiers. due to the involvement in these workss by early hibiscus enthusiasts who hybridised Hibiscus rosa-sinensis with other compatible species. Ross…

Retort stand and clamp

In reference to the safety aspect, the radiation source is kept inside a lead block, inside a wooden box, inside another wooden block, tongues are present for the movement of the source so it never directly handled. The sources themselves are in holders, which channel the radioactive output in one direction alone. However as I…

Compared to the original Daniell Cell

By completing and testing this hypothesis our group believes that it will factor in the aim of increasing the voltage and current of our Daniell Cell. Hypothesis 2 According to the Standard Reduction Potentials for Half-Reactions table, our group hypothesises that by changing the half cells so that their E0 values are a greater distance…

Furagin: Forced Degradation Studies

Furagin: Forced Degradation Surveies Index Index of Figures Index of Tables Abstraction Keywords Abbreviations 1.Introduction 1.1.Forced debasement surveies 1.1.1. Overview of regulative counsel 1.1.2. Review of bing literature and different attacks 1.2.Furagin 1.2.1. Chemical and Physical Information 1.2.2. Pharmaceutical Information 1.2.3. Impurities 2.Aim of the Study 3.Method 3.1.Equipment and stuffs 3.1.1 Method AHPLC/AUPLC 3.1.2 Method…

Galileo's Rolling Ball experiment

Galileo in his rolling ball experiment investigated the acceleration of a ball rolling down an inclined plane, using a similar setup I will investigate how the time taken to roll down the inclined plane varies with the vertical height change. Theory: When two similar objects are thrown vertically downwards, they are in a state of…

Making a standard solution

To find the molarity of the unknown acid, first we had to create a standard solution, the solution we created was Sodium Hydroxide (NaOH). We wanted a 0. 1 molar solution of sodium hydroxide so to get this we had to dissolve 4g of NaOH into 1000cm? of water, but we didn’t want 1000cm? we…

The Coriolis effect

Galileus corrected this view by explaining the path of such a projectile as a parabola, where a continual downward motion acts on the object, that being the pull of gravity. Newton furthered Galileus’ argument in showing mathematically, that the impetus was not used up, rather gravity restricted the cannon’s range by altering the shape to…

How temperature will effect the speed in which the enzyme Catalase will react with Hydrogen Peroxide

Individual enzymes are named by adding ase to the name of the substrate with which they react. The enzyme that controls urea decomposition is called urease; those that control protein hydrolyses are known as proteinases. Some enzymes, such as the proteinases trypsin and pepsin, retain the names used before this nomenclature was adopted. * They…

Does the river Alyn follow Bradshaw's model?

Channel Shape – This is described by hydraulic radius. This is the ratio between the cross sectional area of a river and its wetted perimeter. For example if two rivers have an equal cross sectional area the river with the greater wetted perimeter will have more friction and so the velocity will be less. River A…

The neutralisation of Acids by Antacids

An Investigation to See What Effects the Neutralisation of Acids by Antacids In this experiment I will be looking at what affects the rate of reaction in a chemical reaction between Hydrochloric acid and commercial antacids. I will be looking at one of the Rates of reaction, surface area, to see if a smaller surface…

Propanol and Butanol

To investigate and compare the relationships between the amounts of energy released from different alcohols in the alcohol series. BACKGROUND INFORMATION Alcohols are a series of organic homologous compounds with the general formula of C(n) H(2n+1) OH. They gain their properties, which are different to those of other compounds in the homologous series due to…

Constantan and Nichrome

If the length of the wire is doubled, the electrons bump into twice as many ions so there will be twice as much resistance. I’m going to summary my prediction to make it very clear. Longer the wire the more resistance the material has to electrical current compared to the short wire. This is so…

Chromatography and Solvents

Chromatography is a method of separating compounds and mixtures so that they can be identified and analyzed. The word chromatography means color writing. There are many kinds of chromatography such as the thin layer chromatography, Partition chromatography, Column chromatography, and Paper chromatography. Chromatography is important in the analysis of processes and materials such as environmental…

Ohm's law

In this investigation I want to find out how the length of and the width of the wire affects the resistance. Resistance: An explanation of what resistance would be that resistance is the opposition of a conductor to a flow of current. It is when traveling electrons in a wire collide with the atoms of…

Thermal insulators

To investigate different materials for the most effective thermal insulator for a house. Introduction Heat transfer is the gain and loss of energy. There are three ways in which thermal energy can be transferred:  Conduction  Convection  Radiation Conduction – this is when energy travels from molecule to another. When one molecule receives energy it begins…

Septic Shock

In this essay septic shock and Its complications will be analyzed wealth the Immunological, gastrointestinal, cardiovascular, respiratory and renal (Including the acid-base) systems. This essay will contain the general discussion of homeostasis and will study the homeostasis responses to septic shock In each system. Sepsis and Septic Shock sepsis may be defined as the state…

Nature, Nurture, and Human Diversity

What makes you, you? Is who we are the result of our genes (nature) or is it the result of our upbringing (nurture)? Nature: the result of our genes Nurture: everything else other than genes, the culture you were brought up in, the country and family you were brought up In, the school you went…

The Pygmy Chain Sword Plants

Understanding the process of photosynthesis is also vital in other areas, such as medicine, agriculture, energy production, and even electronics. In medicine, since light has extremely high energy content, sometimes it can cause damage to living organisms such as skin cancer and skin aging. To combat the high-energy content, plants developed photoprotective mechanisms to limit…

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