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Grade 8 explain chemical reactions
Lab chemical processes
1:2 Law of conservation of mass
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HYPOTHESIS
In this lab, one will expect the mass of the reactants and the mass of the products to remain the same when chemically combined in a closed environment. One can clearly see this is the case since the law states that mass should remain the same, in theory.
OBSERVATIONS
As one can clearly see, the closed Erlenmeyer flask lost no mass. For example, the total mass before mixing was 180.9g and 180.9g after mixing. The law of Conservation of Mass was obeyed in this lab. The results prove the law of Conservation of Mass because one can clearly see that regardless of the errors, we see no between the mass prior to mixing and mass subsequent to mixing. The law of conservation of mass states that the mass of your initial substances (reactants) will be the same as the mass of the substances that you get after the reaction has occurred (products), which is precisely what happened in this experiment.
JUSTIFIED ERRORS
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The rubber stopper must have not been closed properly/all the way, or there was a space in it that caused the gaseous material (created from the reaction; CO2) to escape. Thus, this is not a flaw in the law, but rather a flaw in the the doing of the experiment.
Another error that could have occurred. While measuring the Erlenmeyer Flask before mixing it, some of the baking soda might have spilled and reacted to the vinegar, causing some of the mass to evaporate. This causes a difference in the mass prior to mixing, between the closed and opened bag. Yet again, this is rather a flaw in the circumstances and not in the law.
The experiment done in the lab supports the law of Conservation of Mass because we used the reactants and simply rearranged them to create the products without adding or removing anything. For the experiment we used candy and marshmallows. The green candy symbolized carbon atoms, the red ones hydrogen atoms, and the marshmallows represented oxygen atoms; we also used toothpicks which illustrated bonds keeping them all together. The chemical reaction for photosynthesis is the product of six carbon dioxide plus six water atoms is glucose (sugar) plus oxygen. We started by making the food into the reactants, the ingredients for the chemical reaction; six green candy drops and twelve marshmallows plus twelve red candy drops and six marshmallows.
One of the best methods for determining mass in chemistry is gravimetric analysis (Lab Handout). It is essentially using the the mass of the product to figure out the original mass that we are looking for. Thus the purpose of our experiment was to compare the final mass in our reaction to the initial mass and determine the change in mass.
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.
When two substances are added together, their mass is Conserved. This is according to the Law of Conservation of Mass. Does the same apply to volume? Mark W. Meszaros, PhD claims that when isopropyl alcohol and water are mixed, the mass of the two is added, yet the volume decreases (Meszaros, M W., PhD, n.d.).
A balanced chemical equation has reactants and product that has to represent a formulae. The amount of each element, number needs to be the same on either side of the equation. (E.g., HCl(aq)+NaHCO3(s) reacts to produce NaCl(aq)+H2O(I)+CO2(g)). This helps us view the study of the Law of Conservation of Mass, and how it works in this equation.
Greta Christina eloquently puts into words something I know in theory, but can be hard to understand in practice in heterosexual relationships. In Are we having sex now or what? Christina details her record keeping of how many people she had sex with, and what she counted as sex. She talks about the limiting misconception of sex only being coitus, and other acts not “counting.” Christina writes of how when she started having sex with women her outdated system of what was sex and what was not sex was completely destroyed. By limiting sex to “penis in vagina,” Christina was discounting some of her favorite sexual experiances, and including ones she did not particularly enjoy.
Herring v. United States (2009), defines the difference between negligence and acting outside the scope of law is different than an officer doing wrong simply because of a systematic issue. The defendant in this case had illegal evidence obtained during a search incident to an arrest. The issue arose when it was discovered the warrant was not live. This systematical error was not the officer fault. In conclusion the court held that if the officers should be able to trust the system and in this case the validity of warrants.
Kinetics of chemical reactions is how fast a reaction occurs and determining how the presence of reactants affects reaction rates. In this experiment the rate of reaction for Fe+3 and I- is determined. Because the rate of chemical reactions relates directly to concentration of reactants, the rate law is used to find the rate constant, and calculated with specified temperatures.
This reaction allowed magnesium chloride salt and hydrogen gas to be produced. Before having started with further calculations, one must have checked that the equation was balanced. It was also important to understand the law of conservation of mass which states that the mass of the products in a chemical reaction must equal the mass of the reactants. The notion of a mole, which simply states that 1 mol=6.021023particles (atoms/molecules/etc.)(Coull, 2016) was also necessary when it came to dealing with certain numbers in this experiment. Significant figures were extremely important as they were evaluated in almost every step that involved calculations in the experiment.
Balance the following chemical equations and separate the coefficients by commas and a space respectively (put a 1 if the coefficient is assumed 1): 5.3 Types of Chemical Reactions 5.3.1 Combination reactions Combination reactions are when two separate species react together to produce a new more complex compound. In other words, two species combine to form a new compound. These reactions take the form of: X+Y →XY Combination Reaction Synthesis reaction - sodium chloride formation of sodium metal and chlorine gas. Types of chemical reactions, part 1 of 7. Educational chemistry for kids.
The law of conservation of mass was discovered by Antoine Lavoisier many years ago. He claimed that “mass is neither created nor destroyed in chemical reactions.” This is the law of conservation. He came to this conclusion by burning phlogiston. Lavoieror took note that by burning phlogiston it lost its phlogiston and made new things.
We have no gases and solids involved, therefore it is easy to deal with solutions. Similarly, the use of a catalyst complicates things, and if used incorrectly could alter the outcome of the experiment. The theory behind this experiment is that increasing the concentration can increase the rate of the reaction by increasing the rate of molecular collisions. GRAPH I will place the reaction mixture on a paper with a black cross drawn on it. When the cross is completely obscured, the reaction will be finished.
In this lab, we were looking at the conservation of matter, chemical reactions and using mass to find the number of moles present after a reaction. We had previously studied moles (measurement system) and mass. We copiously took notes on the masses of the objects after reactions and observed how the quantity would “change” after a chemical reaction. The conservation of mass is a law that states a mass will stay consistent over time and will not change until it is not combined or removed. We performed a lot of chemical reactions in this lab. The first part of the lab was putting a coiled piece of copper in silver nitrate and washing it out with water. The second and third part was also about adding chemicals and seeing the reactions. The purpose of the experiment was to determine if the values of silver and silver nitrate would stay the same. The hypothesis was that if chemical elements and compounds react the ratio would stay the same, due to the conservation of mass and the law it has.
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On the contrary, if writers fail in error correction, it might have a harmful effect on the consumers of their works, therefore, it is important to know how to properly analyze the sources of errors, evaluate and aim to prevent