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Chemical reactions 8th grade
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A chemical reaction is a process in which the rearrangement of the molecular or ionic structure of a substance is transformed physically or chemically. If the reaction occurs, the starting products will always be different from the products. They also involve the motion of electrons which leads to buildup and breakdown of chemical bonds. There are six types of chemical reactions including Synthesis, Decomposition, Single Replacement, Double Replacement, Combustion, and Acid Base. Each reaction has their own unique characteristics that make them special. First is Synthesis. Synthesis is a reaction in which two different substances are combined to create one substance. In a lab, slime was made as an example of a synthesis reaction. Combining …show more content…
Single Replacement is the process of an element reacting with a compound and taking the place of another element. Substance C can take the place of Substance A in the compound of AB. A metal can only replace a metal and a nonmetal can only replace a nonmetal. To predict whether or not the reaction will occur, using an activity series table will help to compare the reactivities of the elements. The reactivity of a metals is based more on the electronegativity making it more difficult to predict the reactivity of the halogens. A real life example is in the Statue of Liberty, the inside structure was made out of steel. The iron in steel reacts with the oxidized copper which protects the color and integrity. The formula for this reaction is Fe + Cu2+ → Fe2+ + Cu. In a lab 17 single replacements reactions were tested however not all had a reaction. Some were quicker and some slower to react compared to others due to different reaction rates in each …show more content…
Combustion is an exothermic reaction that reacts when in contact with oxygen producing heat and a new product. These reactions are as exothermic as it gets. The general form of a combustion reaction is the reaction between a hydrocarbon and oxygen to create carbon dioxide and water. Hydrocarbon + O₂→CO₂+H₂O. Occasionally, these reactions can release light and produce a flame. To start a reaction, most require a flame to provide heat and initiate the reaction. Combustion is a very common reaction. It's what makes our cars go, and it's what burning is. It is containing carbon which reacts with oxygen to form CO2 and H2O. A simple example of the combustion of Methane, a natural gas, CH4 + 2O2 →CO2 + 2H2O. Another example includes the burning of naphthalene with the equation C10H8 + 12 O2 → 10 CO2 + 4 H2O. The combustion of ethane is 2C2H6 + 7O2 → 4CO2 + 6H2O which is another example. A real life example is the combustion of gunpowder. Gunpowder is a mix of potassium nitrate, charcoal, and sulfur. The potassium nitrate decomposes at a high temperature to provide the oxygen needed. The charcoal and sulfur are the fuels in this reaction. The equation for this reaction is as follows 2 KNO₃ + S +3 C →K₂S + N₂ + 3 CO₂. An incomplete reaction occurs when the oxygen is
4. Exhaust: After the Air/Fuel mix has been burnt, the remaining chemicals in the cylinder (water and CO2 for the most part) must be removed so that fresh air can be brought in. As the piston goes back up after combustion, the exhaust valve opens allowing the exhaust gasses to be released. Ideally an engine takes in air (oxygen and nitrogen) and fuel (hydrocarbons) and produces CO2, H2O, and the N2 just passes through.
Combustion is a rapid, continuous reaction that usually takes place in the gas phase. Wood is an organic compound primarily comprised of cellulose. For wood, the phase change from a solid to gas is almost instantaneous as combustion occurs (Coleman, et al. 95). Ignition occurs when an outside source is no longer needed to sustain combustion (Coleman, et al. 87).
Any reaction that begins with reactants both composed of cations and anions, and these anions switch cations in the products, it is a double replacement reaction. In order to decide whether or not a double replacement reaction occurred in the chemical reaction, a precipitate and/or a color change would be indicative. These changes show that the initial compounds have been manipulated in the reaction. One should look for these changes as evidence in order to determine the type of reaction taking place.
The burning of the materials is a complex process. Combustion of any material requires three components: heat, oxygen and combusting material or fuel. When heat is applied to the composites materials, temperature of the materials increases. At particular temperature, pyrolysis temperature, materials start to decompose, and produce
Classes of Chemical Reactions Whenever a reaction takes place, energy is changed as well when the substances react chemically. Scientists have taken these changes in energy and generalized them. Scientists can take these generalizations and discover more about the nature and tendencies of matter. In this lab, the purpose was to perform seven reactions, write down their equations, and identify the type of reaction.
“A chemical reaction is a change that makes at least one new substance,” according to Richard Spilsbury (2014, p. 8) A physical reaction is when you mix two or more substances and those substances stay the same. This experiment demonstrates a physical reaction called ‘nucleation.’ The rough surface of the Mentos and the carbon dioxide inside the soda combine together to make the soda explode! This is not a chemical reaction because we do not make a new substance. “In physical changes, the original substances do not change chemically. For example, you can dissolve salt in water to make salty solution,” according to Richard Spilsbury (2014, p. 13). In this case, you still have salt and water, not a new product. With Diet Coke and Mentos, you still have these two substances in a much messier form, but you do not have a new
Chemical Reaction: a process in which one substance is converted into a new substance with new properties
Next, I research some example of the three. In biochemical reactions are reduction and oxidation, water additional and removal, bond breaking reactions and the movement of groups between molecules.
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or
Redox reaction is a type of chemical reaction. A chemical reaction involves process change that happens when to or more molecules react with one another and result in the formation of a new product. In this article more about redox reactions with respect to electron transfer reactions.
Chemical kinetics is the study and examination of chemical reactions regarding re-arrangement of atoms, reaction rates, effect of various variables, and more. Chemical reaction rates, are the rates of change in amounts or concentrations of either products or reactants. Concentration of solutions, surface area, catalysts, temperature and the nature of reactants are all factors that can influence a rate of reaction. Increasing the concentration of a solution allows the rate of reaction to increase because highly concentrated solutions have more molecules and as a result the molecules collide faster. Surface area also affects a
The three vital things for a fire to be created are fuel, oxygen, and heat. Fuel can be anything that is combustible, and heat can come from rubbing from a match or any other kind of friction. Oxygen is all around us, and is needed for fire to start. In the process of fire, fire is heated up by fuel to a high temperature. Material of the wood starts burning around 300 degrees farenheight. Then, gas is made from the material; this gas is the same as smoke, and rises from the wood. The rest of the material forms “char”. Char is made from carbon and ash, and a lot of people use it to start their own fires, and commonly known as “charcoal”.
There is also an incomplete combustion, meaning it is burned in an air lacking oxygen. If the oxygen is not enough, the carbons turn to carbon monoxide. Carbon monoxide is very harmful to living organisms.
There are 6 major types of chemical reactions; combustion, synthesis, decomposition, single displacement, double displacement, and acid-base. A combustion reaction is when oxygen combines with another compound to form water and carbon dioxide. A synthesis reaction is when two or more complicated ones. Decomposition reaction is the opposite of a synthesis reaction. Single displacement is when the anions and cations of two different molecules switch places, forming two entirely different compounds.
Those compounds that are not natural and are produce by the reaction of other compounds are synthetic compounds, for example polymers.