Conservation of Mass, Exothermic, and Endothermic Reactions: Weekly Blog #20

https://www.youtube.com/watch?v=2S6e11NBwiw

Summary

This week in science, I learned about the conservation of mass, catalysts, endothermic, and exothermic reactions through legends of learning. The law of conservation of mass states that no atoms are created nor destroyed during a chemical reaction. Instead, the atoms are re-arranged, and create new substances in the process. A catalyst is a substance that will either speed up or slow down a chemical reaction. An exothermic reaction is a reaction that releases energy during the reaction, making the temperature hotter. An endothermic reaction has a similar situation, but the exact opposite. In an endothermic reaction, energy is absorbed. This results in the temperature being cooler.

S&EP - Using mathematics

When trying to balance an equation and follow the law of conservation of mass, there is a lot of math involved. If the equation isn't balanced, than you must add a co-efficient next to that number in order to balance it out. This will cause the amount of atoms to be multiplied and be equal to the other side. This follows the law because you aren't changing the types of atoms but instead the number of the type of atom in order for it to be feasible reaction. When you multiply the number of atoms, you must calculate how many atoms there are constantly so you wont lose track or do a wrong step in the operation. This is how mathematics is used when balancing a chemical reaction.

XCC - Energy and Matter

This week we related the concept of energy into our studies. This is because when we were learning about endothermic and exothermic reactions, we learned about how energy in transfered through chemical reactions. In an exothermic reaction, the energy is released more than what is obsorbed, causing the reactants to have more energy that the products. In an endothermic reaction, energy is absorbed more than energy that is released. This causes the products to have more energy than the reactants. This is what concepts I learned about energy.

Mixtures,Solution, and Chemical Reactions! - Weekly Blog #19

http://www.chemwithclick.com/unit7chemical-reactions/

Summary

This week in science, we learned about chemical reactions, pure substances, and how solutions, mixtures, and compounds differ from each other. A chemical reaction is the process in which the atoms in a substance are converted into a new substance. There are two sides to a chemical reactions, the reactants and the products. The reactants in a chemical reaction yield the product. Some traits that can be found in a chemical reaction are a change in color smell, smell, temperature. Things that can happen due to a chemical reaction are a creation of gas or absorption of heat. A pure substance is a sample of matter that has definite chemical and physical properties. An element is a pure substance that cant be separated chemically or physically.

S&EP: Asking Questions Defining Problems

I defined the specifications for what makes solutions, compounds, and mixtures different from each other. This established what was already know about the subject, and also made it so I can understand how they differ from each other. A mixture is when there are 2 or more things that are physically bonded. A compound is when 2 or more elements/atoms are chemically bonded together. And finally, a solution is when one thing is dissolved in another. This doesn't mean that they are chemically bonded, but instead physically bonded more thoroughly. There are two types of mixtures, a heterogeneous mixture and homogeneous mixture. A heterogeneous mixture is a non-thoroughly mixed mixture, and is the least uniform throughout, A homogeneous mixture is when a mixture can be physically separate, but is the most mixed and uniform throughout. This is how I defined the differences between mixtures, solutions, and compounds.

XCC: Stability and Change

There is a factor of stability and change when it comes to a chemical equation. This is shown through the laws of conservation, that states that no new atoms are created or existing atoms are destroyed in the process of a chemical reaction. This shows that there needs to be the exact same amount of atoms on each side of the equation for it to be feasible. This is due to the provided balance or stability when going through a change such as a chemical reaction. This is how I applied cross cutting concepts this week, and how stability and change is a great factor in chemical equations.