Cool Chemical Reactions

In this blog, I will be discussing the reactions from this list of the “Top 10 Amazing Chemical Reactions” http://listverse.com/2008/03/04/top-10-amazing-chemical-reactions/. First, I will determine whether each reaction is an actual chemical reaction, and if so, what type of reaction and the balanced equation formula for each. Then, I will describe my favorite reaction and why I like it more than the others.

10. Sodium and Water in Chlorine Gas: This is an actual chemical reaction because a gas and a salt are produced. It is a synthesis reaction. The balanced chemical equation for this reaction is 2Na+Cl2= 2NaCl.                       .

9. Magnesium and Dry Ice Reaction: This is a chemical reaction because the magnesium burns in nitrogen and carbon dioxide, and obviously a gas is produced. It is a single replacement metathesis reaction with a balanced equation of 2Mg+CO2= 2MgO+C.

8. Potassium Chlorate and Candy Reaction: This is a chemical reaction because oxygen gas is produced as a result of something burning. This is a combustion reaction for the reason that it is a burning reaction with oxygen. The balanced chemical equation for this reaction is 6KClO3 + C6H12O6 –> 6KCl + 6H2O + 6CO2 + 3O2.

7. Meissner Effect: This is not a chemical reaction because the temperature changes, but no new substances are created or destroyed.

6. Sodium Acetate Super Saturation: This is not a chemical reaction because although the heat is produced, it is simply a phase change, not a chemical change.

5. Superabsorbent Polymer: This is not a chemical reaction because the polymer just absorbs liquid, but it doesn’t change chemically in doing so.

4. Floating on Sulfur Hexafluoride: This is not a chemical reaction because the sulfur hexafluoride has the ability to “lift” things because it is denser than air, but no chemical change occurs.

3. Superfluid Helium: This is not a chemical reaction because as the helium cools, it undergoes a physical change, not a chemical change.

2. Thermite and Liquid Nitrogen: This is a chemical reaction because smoke and fire is produced. It is an example of a single replacement reaction, under the category of redox reactions, and the balanced equation is as follows: Fe2O3 + 2Al –> Al2O3 + 2Fe.

1. Briggs-Rauscher Reaction: This is a chemical reaction because there is a repeat change in color, indicating chemical change. From the information given, it is impossible to determine the type of chemical reaction or the corresponding balanced equation.

 

 

 

 

My favorite chemical reaction was Number 8, the Potassium Chlorate and Candy Reaction. I thought it was very interesting and a bright, obvious chemical reaction, making it stand out from the others. It was quite fun to watch.

 

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Solutes and Solvents

During our latest mini lab, we experimented with sugar and salt solutions. A solution is defined as a “homogeneous mixture of two or more pure substances”, and is composed of solvents and solutes. A solute is present in greatest abundance, and is usually in the form of water. A solute is any other substance in the solution. In our experiment, we worked with multiple solutions, with the goal of differentiating them. We differentiated the salt solution, sugar solution, and DI water by the level of cloudiness present in the water, but this was just out of luck. Generally, solutions are not easily distinguishable. We tested with a light bulb for conductivity to ensure our observations, which is what would usually be done in this situation. The conductivity present is a result of charged ions in the solution.

The difference between an electrolyte and a nonelectrolyte is that an electrolyte dissociates into ions when dissolved in water, while a nonelectrolyte may dissolve, but it does not dissociate into ions when it does so. Particle diagrams can be created to represent these changes. Particle diagrams include individual ions/particles surrounded by the solute, which, in this case, is water. They appear this way because when something dissolves, it is engulfed by the abundant material. Depending on the charge of the particle, the hydrogen of the water molecules may face away from or towards the surrounded material. For example, a diagram of our sodium chloride solution would show both sodium and chloride ions isolated with water encircling them. The chloride molecule would be displayed as larger because of its greater negative charge and corresponding electron cloud. As a result of the negative charge, the chloride molecule would have the slightly positive hydrogen heads of water facing it, because opposites attract. The opposite would occur with the sodium molecule. It would be shown as smaller, and as a result of its positive charge, would attract the slightly negative oxygen atom.

AnCl in crystal structure and in water

A particle diagram can also be created for a sugar solution. In this instance, the sugar molecule would be engulfed by water molecules, as displayed below. 

Sources:

Flipped Notes 4.2 B and C

http://www.thunderboltkids.co.za/Grade6/02-matter-and-materials/chapter4.html

http://www.biology.arizona.edu/biochemistry/tutorials/chemistry/page3.html

Explore Lab: Chemical Reactions

Our goal in lab today was to observe multiple different types of chemical reactions. Each group was assigned two reactions to complete. My partner and I performed Reaction 1 (copper wool combines with oxygen) and Reaction 4 (Decomposition of sodium hydrogen carbonate). We observed the reactions and balanced the chemical reaction equation.

For the copper wool reaction, the balanced chemical reaction was 4Fe + 3O2 = 2Fe2 + 2O3, and for the NaHCO3 experiment, 2NaHCO3= 2H2O + O2. . A chemical reaction can be indicated in one or more of three ways: change in color, production of gas/condensation, or change in temperature. The evidence of a chemical reaction was apparent in the lab today by the change in color, popping, and burning of the wool in reaction one, and in reaction four, the production of condensation at the mouth of the test tube suggested such. These observations prove that our reactions were actual chemical reactions.

Subsequent to a lengthy discussion, we realized that the reactions were organized into sections. The reactions in each section had something similar. For example, section one yielded one product, section two had a single reactant, section 3 had an element and a compound in both the reactants and the products, section four resulted in a switch in compounds (see below balanced reactions), and section five had a reaction producing carbon dioxide and water. A unique model can be created for each reaction section because each section had a unique chemical  reaction in terms of what it produced. Products of reactions can be predicted because if the reactants are known, and the type of reaction (what “section”), then that information can be used to determine the products of the reactions. 

 

Three Questions

1. What tasks have you completed recently? 

Recently, I have completed multiple Spanish assignments, anatomy glogs and blogs, English assigned reading, and a few government web tours. In terms of my life outside of school, I have reached new fitness goals, something I am very proud of.
2. What have you learned recently?

Recently, I have learned about the difference between verb tenses, how to solve complicated stoichiometry problems, the functions of a couple of dozen hormones, and the impact that standout Supreme Court cases have had on our country.

3. What are you planning on doing next?

Next, I am planning on using the long weekend to read and relax, and to make a decision about certain extra-curriculars for the upcoming school year.

Stoich-a-whaaaa?

Recently in class, we performed a mini lab experiment with powders and vinegar. The goal was to have a balanced chemical reaction, meaning a certain amount of solid was supposed to produce a certain amount of gas. The mass relationship between the solid and the gas is mole to mole. It is a molar relationship because for every mole of solid used, a mole of gas was produced. This molar relationship means that the mass relationship applies to any and all chemical reactions. In every situation, a mole of any given type of solid will produce a mole of some sort of gas. While this is true, the mass of each mole will differ, so the mass ratio will be the same (1:1 mole:mole), but the amount of gas produced as a result of solid used will change from experiment to experiment.

In situations where an equations must be balanced, a molar relationship of 2:2 arises, but this situation still has the same principle as above.