Investigationg of Chemical and Physical Changes Why I am conducting this experiment? In order to learn how to recognize chemical and physical changes, I have to carry out this experiment to see different chemical and physical changes of different substance. How can we recognize physical changes and chemical changes? ----------------------------------------------------------- A chemical change involves a creation of a new substance, but a physical change doesn’t involve any creation
Chemical changes are when substances combine to form a new substance which is called synthesis and are usually irreversible. A chemical reaction causes atoms in the substances to rearrange and change their properties or composition therefore resulting in at least one new substance. Chemical reactions can also cause the decomposition of a substance resulting in two or more different substances. There are many manmade and natural chemical changes that happen everyday. Two main natural chemical changes
Detecting Signs of Chemical Change Abstract: The objective of this experiment will be to combine various substances, liquids and metals, and to observe their behavior when they are combined. The types of reactions observed shall determine the nature of these reactions: physical or chemical. Introduction: An elements¡¦ reaction to certain substances may be predicted by its placement on the Periodic Table of Elements. Across a period, an element on the left will react with more vigor
Investigation to find out if changes in concentration of acid affect the rate of a chemical reaction PLANNING – Title – Investigation to find out if changes in concentration of acid affect the rate of a chemical reaction. Introduction – The rate of reaction can be defined as the speed at which a reaction takes place. The rate of reaction tells us how quickly a chemical reaction has happened. There are many things that can affect the rate of reaction, (some of these are shown in figure 1 below
Herbal remedies have been used throughout the world for thousands of years and recently their use has become popularized in America. People tend to view herbal remedies as being safer then prescription drugs because they are believed not to contain chemicals or cause side effects. St. John’s Wort is an herbal remedy, which prevents the destruction of seratonin, a natural anti-depressant, is often used to treat depression. Due to the increasing interest it St John’s wort, as well as in other herbal remedies
Investigation into Electrolysis - Copper Sulphate Introduction Decomposition caused by electricity is called electrolysis. The electrical energy causes a chemical change. When a salt is dissolved in water, its ions become free to move so the solution can be "electrolyzed." The products of the electrolysis depend on the chemical solution, its strength and the type of electrode. The cathode is negatively charged and therefore attracts to it positive ions. E.g. hydrogen. The more reactive
Electrolysis of Copper in Copper Sulphate Solution Introduction Aim This is an investigation into how temperature affects the amount of copper lost from the Anode and gained on the Cathode during electrolysis. Electrolysis is… The chemical change by passing electric charge through certain conducting liquids (electrolytes). The current is conducted by migration of ions - negative ones from the Anode (positive electrode), and positive ones to the Cathode (negative electrode). Reactions
understanding: A rate is a measure of change that occurs in a given time whilst a reaction is the interaction of substances undergoing chemical change. The velocity at which any mix of substances are transformed into a product/s in a given unit of time is the rate of reaction. The speed at which this modification occurs relies on two main factors; the amount of collisions between reacting particles and what portion of these collisions are successful in producing a change within the substances present
During pregnancy, a woman’s body goes through a vast amount of changes in a small amount of time. There are physical, mental, and even chemical changes that occur during the nine months that it takes to develop a healthy baby. With the ongoing changes that are taking place within the mother, the care of the mother and the developing fetus is changing as well. Certain testing that could be done on a woman who is 30 weeks pregnant, in the third trimester, would not be performed on a woman who is 10
Identifying Five Unknown Chemicals I was given 5 unknown samples, which are sodium chloride, sodium thiosulfate, calcium carbonate, sodium bicarbonate and sodium nitrate and these samples are all white and solid. However, I don’t know which substance is which sample and I was only given some information about the physical and chemical properties of these substances. In order to identify the 5 unknown samples, knowing which sample is which substance, I have to carry out this experiment,
activation energy, which is explained as the collision theory. Collision theory explains how chemical reactions occur and why rates of reaction differ. For a reaction to occur, particles must collide. If the collision causes a chemical change it is referred to as a fruitful collision. For a reaction to occur, the reactant particles must collide. Only a certain fraction of the total collisions cause chemical change; these are called successful collisions. The successful collisions have activation energy
A Critical Analysis of the Effects of Chemical Castration and Physical Castration on the Recidivism Rates of Sex Offenders Introduction This paper examines the effects of chemical castration and physical castration on the recidivism rates of sex offenders. Using theory integration or the multifactor approach, the findings reveal there are several factors influencing sex offender recidivism. Both chemical castration and physical castration have the potential to reduce the recidivism rates of
the workings of the brain and to learn the effects of natural and unnatural substances on it. In order to look at chemical effects on the brain, one must first get an understanding for the chemicals as well as how the brain works to interpret and react to signals set out by these chemicals, rhythmically and physiologically. Several chemicals observed include: cocaine (and other chemicals), seratonin, and melatonin. Nature and life are full of rhythms. Rhythms in nature include: day and night
of the plant vary in chemical constituents. In 1993 researchers discovered 400 to 500 chemicals. Some of the major types of chemical constituents in marijuana preparations include acids, alcohols, aldehydes, and amino acids. Cannabinoids, esters, enzymes, glycoproteins, hydrocarbons, ketones, lactones, nitrogenous compounds, phenols, pigments, proteins, sugars, steroids, terpenes, and vitamins are others (Carroll 1993). These are among some of the naturally occurring chemicals in marijuana and were
the problem of reduced drinking water quality due to chemical pollution. Some bodies of water in the United States are becoming polluted from chemicals and restrictions are needed to protect drinking water quality. THE BACKGROUND OF CHEMICAL USE AND WATER QUALITY Drinking water quality was not a concern until the last century when the use of chemicals was greatly expanded. Chemicals are used to kill weeds, insects, and other pests. Chemicals are typically sprayed on an area and are designed not
Chemical Control Agents Used Against the Gypsy Moth The gypsy moth (Lymantria dispar) is a highly disruptive species that can, and has played a distinctive role in the lives of many organisms. Included in these organisms are various deciduous trees and shrubs, wildlife species that share the same environment, and even humans. The gypsy moth destroys the beauty of woodlands via defoliation, alters ecosystems and wildlife habitats, and disrupts our own lives. It should therefore come as no surprise
resources here for many years to come we are going to have to make some drastic changes in the way we treat the earth, and these changes will have to start with our pollutants. (Jones,1993,pp.4-15) Agricultural pollution is a very big contributor to water pollution. Problems we see with agriculture are applications of fertilizers, insecticides, and pesticides. We have made vast improvements in the types of chemicals we are using, as to how environmentally friendly they are. In 1985 the amount of
that make our planet warm enough for habitation are largely invisible. Even water vapor, the main constituent driving the greenhouse effect, is invisible, but whose existence can be inferred when it condenses as one exhales on a wintry day. The chemicals-such as dioxin, PCBs, pesticides, arsenic, DDT, and lead-that we litter our soils, atmosphere, and waterways with are also nearly invisible, especially at the concentrations that we, the users and consumers, are told are "acceptable." Microscopic
Evaluation of the Financial Performance of a Chemical Company The Lee Chew Cheng Wong Chemical Company produces high quality speciality chemicals, and it exports around 85% of its output to many countries and regions. Since the establishment in the mid 1980 this company has emphasized the shareholder value. To keep this focus, a new Chief Executive Lee Shan Loke Teo has proposed a lot of new policies. This assignment evaluates the financial rations with Sun See Chemical Company and average industry, and presents
calculator. Safety: Throughout this experiment normal lab rules will apply with safety gear to be worn at all times e.g. goggles and lab coat, also due to fact we are using hazardous chemicals their hazards must be taken into account. It is also best to make sure you are working in a well-lit area. The chemicals that we will use are limewater, hydrochloric acid and Phenolphthalein. The hazards are as follows: * Hydrochloric acid - Very corrosive, irritant. * Limewater (alkali) - Irritant