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    Chemical Changes

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    When matter goes through a physical change its appearance changes not its molecules. Stepping on an aluminum can and crushing it is a physical change, its shape changes but the energy inside the can did not change meaning it couldn’t be a chemical change. Chemical changes happen on a very small scale and can happen over a period of time. Chemical changes are a change that forms a new chemical substance. A chemical changes is the breaking or joining of bonds and atoms. Iron rusting, gasoline

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    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

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    Temperature's Effect on the Rate of a Chemical Change Introduction This investigation is about how temperature can affect the rate of chemical change of calcium carbonate in the form of solid marble chips reacting with dilute hydrochloric acid. During the investigation I will try to find out how by changing the temperature of the solvent this will affect the rate of chemical change of calcium carbonate and hydrochloric acid. For every experiment I do, I will measure the amount of carbon

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    INTRODUCTION: Chemical Change

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    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

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    Chemical Changes Lab

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    1. For the chemistry and chemical changes unit I placed standards 2.1.2, 4.1.1, 4.1.2, and 6.1.7. I found standard 2.1.2 in the fourth to sixth grade lab Mixtures and Solutions. In 1| Mixtures my lab group and I mixed three different solids (gravel, powder, and salt) with 50 mL of liquid water in three different cups. We examined and discussed the color, texture, particle shape, and particle size of the solids and then made observations when the water was added and discussed the properties of the

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    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

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    and chemical changes. The physical properties of a substance can be observed and measured without changing the composition of the substance. It can be used to identify and describe substances.  Physical properties of matter include odor, color, density, solubility, boiling point and melting point, and its physical state at room temperature. A colorless, odorless liquid that freezes at 0°C and boils at 100°C is probably water, for example. Every substance also has chemical properties. Chemical properties

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    … A chemical changes lead to the formation of substances that help grow our food , make our lives more productive , a chemical change or chemical reaction is a process in which one or more pure substances are converted into one or more different pure substances , The Chemical changes take place as one substance is converted into another , it Can the conditions be altered to speed the changes up, slow them down, or perhaps reverse them , Once chemists understand the nature of one chemical change

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    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

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    Chemical Warfare Changes

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    "The military use of chemicals, bacteria, viruses, toxins, or poisons to injure or kill soldiers or civilians is called chemical and biological warfare. The means by which the harmful substances are delivered to the enemy are called chemical and biological weapons. Formerly, the use of smoke, flares, flamethrowers, napalm, and the like was considered to be chemical warfare, but now the term is generally limited to the use of toxic agents on the battlefield." ("Chemical weapon." Britannica School

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    Chemical Change Lab

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    Experiment 1: Heat Associated with Chemical Change In this experiment, the heat of combustion reaction of a wax candle was measured. First, a clean 7.7180 g metal can was obtained, and into it a 100 ml of cold water was placed. The mass of the can and water was measured to be 112.9789 g. For all temperature measurements, a calibrated thermistor connected to the LabWarksTM interface was used. The temperature of the cold water before heating was 17.8 °C. Further measurement, including the mass of

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    Electrolysis

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    In chemistry, the production of chemical changes by passing an electric current through a solution or molten salt (the electrolyte), resulting in the migration of ions to the electrodes: positive ions (cations) to the negative electrode (cathode) and negative ions (anions) to the positive electrode (anode). During electrolysis, the ions react with the electrode, either receiving or giving up electrons. The resultant atoms may be liberated as a gas, or deposited as a solid on the electrode

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    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

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    St. John Wort

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    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

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    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

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    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

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    Electrolysis

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    of copper gained or lost on the electrodes using a different amounts of current each time during electrolysis. How does the changing of the current and surrounding temperature effect the electrodes? Variables: Throughout the experiment I will change the amount of current used. I will measure the weight of the electrodes after each test. To make the test fair I will be keeping the same electrodes throughout the experiment. Prediction: I predict that as the current increases the mass gained

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    Alcohol Consumption

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    conflict between the two selves. Although there are arguably two selves, they are actually both rooted in the physical. As a result, a chemical change in the body can result in a significant change in the mental/emotional self. Specifically, I will explore how the effects of alcohol consumption can significantly impact one's choices, how causing a physical change by choice can influence a person mentally. The experiment that I designed following the "Time to Think?" lab heightened my interest

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    co-ordinate ΔH is the heat content, which is the enthalpy, which is negative in exothermic reactions as the diagram shows that energy is 'lost' as heat. Enthalpy is defined as the energy of reaction, or the heat energy associated with a chemical change. For any reaction carried out directly at a constant pressure, the heat flow is exactly equal to the difference between enthalpy of products and that of the reactants. To measure the heat energy given off, we must use this energy to heat

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    In Mr. Carlson’s class, my peers and I executed a lab. The purpose of this lab was to decipher whether or not a substance would change into a completely new substance by adding heat to it. I hypothesized that if I were to apply thermal energy to a substance, then it will change into a new substance. After the lab was complete, I found out that my hypothesis was supported by the data collected. To start off, the lab the fire heated up the substance forming a condensate in the inside of the test tube

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