Looking back on this unit, I realize this was probably the toughest one, at least for me.
I'm not exactly the brightest when it comes to math, ultimately making the concepts harder to understand. The day before the test, I could barely get any sleep because I wanted had to do good on it. I didn't do too well on my last quiz, so I had to make up for it with the test.
Overall, I think I did fairly well on the test, at least better than I did on the quiz. While this unit came with many sleepless nights studying and panicking, I felt that I was able to overcome that and do the best to my ability.
(October 30, 2015) People use dimensional analysis to convert one quantity to another. In dimensional analysis, the two diagonals must equal the same units as each other.
Given Unit/(Starting Info) X Desired Unit/Given Unit = Desired Unit (Asking to solve for)
What happens when your unit is squared or cubed? When you square, or cube, the unit, remember to cube the number as well. For example: 56in^3 to cm^3 56in x in x in x 2.54cm/1in x 2.54cm/1in x 2.54cm/1in The inches cancel out, leaving you with cm^3.
Other important info: Density: mass over volume ex: mass=224.50g volume=10.0cm^3 224.50/10.0=22.5g/cm^3 Temperature: measure of the average kinetic energy of the particles in a sample. (Will Never Be Negative!)
On Friday, we talked about uncertainty in measurements, which brought along the wonderful method of scientific notation.
Scientific notation is a mathematical expression used to represent a decimal number between 1 and 10, multiplied by ten. It is also equal to the number of times the decimal places must be moved.
Talking more about uncertainty, different measuring devices have different uses and different degrees. This is what we call significant figures, or sigfigs for short.
There's five important rules for significant figures:
Addition/subtraction and multiplication/division with sigfigs have rules to them as well. When adding/subtracting: the number of sigfig in the results is the same as in the measurement with the smallest number of decimal places. Multiplication/Division: the number of sigfig in the results is the same as in the measurement with the smallest number of sigfigs.
Today we started our new unit, math and measurement. I knew right away that this was going to be one of my weaker units because of that dreadful 'M' word--Math. I was never the best at math.
Aside from that, our lecture today was on matter, mostly a review from freshman year.
There are different states of matter, but the three main ones are:
Solid
Liquid
Gas
There are also different types of properties:
Chemical - observed when changing into another substance
Physical - observed WITHOUT changing into another substance
Other key terms to know:
Homogeneous Mixture: A mixture which has uniform composition and properties throughout.
Ex; a teaspoonful of table salt stirred into a glass of water.
Heterogeneous Mixture: Any mixture that is not uniform in composition. Using various techniques, the parts in the mixture CAN be separated.
Example; a bowl of fruit loops cereal (cereal itself, milk)
Filtration: A technique used either to remove solid impurities from an organic solution or to isolate an organic solid.
Distillation: The separation of a liquid mixture into its components on the basis of differences in boiling points.
Chromatography: A process in which a chemical mixture carried by a liquid or gas is separated into components as a result of differential distribution of the solutes as they flow around or over a stationary liquid or solid phase.
