Chemical Reactions 2

This past week in class, we started learning about our next unit, Chemical Reactions. You can tell when a chemical change is occurring thanks to sensory clues. These are things such as:
-color change
-a solid forms
-bubbles form
-heat/flame is produced or abso


In a chemical reaction equation, there will be a small letter(s) after each compound, telling you what state it's in. These are:
-g (gas)
-l (liquid)
-s (solid)
-aq (aqueous)

Here is an example of what one of these equations might look like:
rbed

Chemical Reactions 1

Today in class, we learned about RedOx reactions. Unlike the other reactions we have been learning about, RedOx reactions use the transfer of electrons as their driving force. If an element loses electrons, then it is considered oxidized, and if it gains electrons, it is considered reduced. These reactions are single-replacement reactions in which a metal will replace a metal and a nonmetal will replace a nonmetal. They will be of use in the future when we have to predict the products of a chemical reaction that uses the transfer of electrons as their driving force.

Chemical Composition 4

Tomorrow in class, we will be participating in the Formula of a Hydrate Lab if we answer the pre-lab questions correctly. One of the questions will be about the procedure, and the other one will be a unit conversion question. I am confident that I will answer both questions correctly because I am aware of how to answer conversion questions and I have read over the procedure multiple times.

Chemical Composition 3

The other day in class, we learned how to convert between moles in a balanced chemical equation, mass in grams, representative particles (atoms, molecules, formula units, ions), and the volume gasses at STP. We were given the "Mole Road Map" to help with this, which can be seen below:

Chemical Compositions 2

I think I am speaking for the majority of the class when I say that the Chemical Composition exam was one of the hardest we have taken this year. It was stressful and not very many people finished before the bell rang. Some of us still may have trouble, so I have found a video and a website that can help people if they so wish.

Chemical Compositions 1

We have been learning all kinds of uses for dimensional analysis, such as converting elements as well as compounds.

Matter and Measurements 4

Another topic we learned about recently in class are "sig figs"; this is short for significant figures. This is one of the more challenging topics of this unit, so I decided it would be a good idea to make a post about it, so if I need help reviewing/remembering how to use them, I can refer back to this.

Sig figs are the digits that were actually measured, and we pay close attention to them when rounding. When we estimate something using sig figs, we can estimate 1 digit past the calibration on the instrument.