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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
For the first phenomena, he noted how all combustions involved the formation of fire or light. With that in mind, Lavoisier also observed that this combustion occurs only through dephlogisticated air / pure air. Other airs (e.g. carbon dioxide) act as a fire extinguisher similar to that of water. Another combustion phenomenon he outlined was how the weight of the burnt material directly relates to the amount of air used in the reaction. Moreover, he also described how certain substances turn into acids after it has been burn...
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
== == I completed a table to show my results, here is the table: Table 1. Results of different changes of substances Part A Copper (II) Sulfate and Water Reactant description Water (reactant): Color: Colorless Transparency:
2. A piece of copper was obtained. It was a small, rounded wire that could be bent, although with a greater difficulty than the Mg strip from the previous account. It was copper in color (never saw that one coming, didja) and had a metallic luster. The copper was put in the flame of a Bunsen burner and after several seconds, it began to blacken. The flame was applied to it for about a minute and a half, and the copper appeared silvery under intense heat, but when it was removed from the flame, the silver color quickly faded. The copper strip was now black all over, and the change in color suggested that a chemical change had occurred. The Cu had reacted with the oxygen in the air and formed copper oxide. The black color could be scraped off, but only in small slivers. It would crumble when it was irritated with a great deal of pressure, respectively. It was a synthesis reaction as displayed by the equation here.
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.
Chemical Reaction: a process in which one substance is converted into a new substance with new properties
“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
Full combustion should generate two products only: carbon dioxide and water vapour. Hypothesis Within a molecule there are bond energies that hold the atoms together. When the fuel combusts, a chemical reaction takes place, this breaks the bonds, this requires energy, and makes new bonds, this gives out energy. The energy differences between the two tell us how much energy was given out or taken in. We can show this in a graph.
Chemical reaction can be a building blocks of chemistry such as atom, ions, molecules, and electrons. Thing we studied last week in week 3. It is important to healthcare professionals, because our bodies are made from chemicals, where all matters do matter, because chemistry are made of just about everything in our lives. Especially in our healthcare field environment we have labs, pharmacy, plants, and Industry plants in chemistry. These are some example we use of the three chemical
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.
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”.
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
Those compounds that are not natural and are produce by the reaction of other compounds are synthetic compounds, for example polymers.
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Chemical reactions make changes to the positions of electrons. Chemical reactions are summed up by a single chemical change. They tend to yield one or more products. A single reaction may contain more internal reactions. Chemists have now seen that certain reactions can change in time or space. Before 1920 chemists believed that changes in closed homogeneous systems were impossible. The most famous chemical reaction is called the Belouslov - Zhabotinsky reaction. This is also the first chemical reaction found that had a major change in a reaction. The Belouslov – Zhabotinsky reactiomwas started a Boris Pavlovich Belouslov discovered the first chemical reaction in the class was with the couple of Ce3+/Ce4+ as a catalyst and citric acid reductant. He saw that it changed from being colorless to yellow, and also found that there was a frequent change increase as the temperature rised. This was found in 1959. Anatol M. Zhabotinsky replaced the city is acid with malonic acid (MA) and it became the most widely used version of the BZ reaction in 1964.