Section 1.5 Chem to Go 6-8

#6

A. No, it does not since the sand would not weigh enough as the gold, therefore setting off the trap since the amount of weight needed was not met. 

B. 1000×19.3g=19300g

Mass of statue =19,300g

C. 19300/454=42.51lb

Weight of statue = 42.51lb

D.

Mass of 1 gallon of mile = 3700g

Mass of Statue = 19300g

19300/3700=5.21

5.21 gallons of milk = mass of statue

#7

a-Lead

b-Gold

C-Silver

#8

a-Feathers

b-Water

c-Copper

Chem Talk 1.5 Q’s

Checking Up #4

253g/80.cm^3 = 3.1625

Answer = 3.16g/cm^3

 

Chem to Go 2-5

2. 

Volume of solid = 62.7-48.4 = 14.3mL

123.4g/14.3mL = 8.62g/mL = Density of Liquid

3.  

Mass of liquid = 40.14-33.79 = 6.35g

6.35/13.3 = .477g/mL = Density of Liquid

4. 

0.79*589=465g = Mass of Methanol at 589mL

5. 

746/8.96=83.2cm^3 = Volume of Copper at 746g

 

 

Chem Talk 1.5

Today in class, our labs groups dove into an investigation about the mass and volume of water. We figured that the amount of “stuff ” inside a certain amount of something is its density. This property of matter directly relates to objects floating in water. If something is more dense than the water, it will float, but if it weighs more than an equal volume of water, it will sink. It was also cool to read about Archimedes running through the street naked after hearing that he figured if the king’s crown was solid gold. There will always be uncertainty in our measurements that we take in science, but hopefully with technological advancements, this will one day be no more. I have always hate sig-digs, but they play a vital role in understanding the sciences. It also came to my attention that accuracy was not the same as precision. Accurate was how close you were to the target, and precise was how close all of your measurements were. Pretty cool to finally know the difference.                      

Chem Talk 1.3

Tonight, I read about pure substances and mixtures of sed substances. Last year in physics, I had learned about solutions and solvents. I remember mixing salt with water until it fully dissolved. The book went on to talk about physical and chemical change and how they are different. My understanding for mixing things has increases as well as my understanding for colloidal dispersions and suspensions. Hopefully in class, we will be able to shine lights through certain mixtures and see what happens. 

Sec 1.2 Checking Up

1. Temperature measures the speed of the molecules in any given substance. It is a measure of the average kinetic energy of molecules. Intuitively, temperature gives us humans a sense of how hot or cold something is. 

2. When heat energy is transferred to the particles of a material and its temperature increases, the kinetic energy, or energy of motion, of the particles of the material increase. In more simpler terms, the particles start to move more and more crazily. And as they get closer and closer to their melting and boiling points, particles actually start to either spread apart or gather together. 

3. The temperature of a material remains the same when it is undergoing a change of state. As seen in the heating curve of water, when turning into a gas, the water remains at 100 degrees celsius. 

4. The normal boiling point of water is at 100 degrees celsius, but only on sea level. As you start to increase or decrease on sea level, the temperature it takes for water to boiling may increase or decrease. At the top of a mountain, you would find that water boils at a lower temperature because the atmospheric pressure is less than it is a ground level. 

Chem Talk 1.2

Tonight’s reading of chem talk was pretty interesting. It talked about states of matter, including plasma, which is a high-energy state of atoms and molecules. It also went into detail about temperature and how the average kinetic energy of something are related. I never knew about the kinetic molecular theory before reading, which really got my mind wondering, what other cool things like physics are related to common day things such as temperature? Reading about the boiling point of stuff was pretty sub-par, but as I got into the sublimation portion of the reading, my thinking was once again sparked. I remember learning a long time ago that gas was able to turn straight into a solid and vise versa, but after forgetting, reading this was just as cool as learning it in the first place. Maybe, we could even do it in a lab in class. The book also talked a lot about how the atmospheric pressure has a lot to do with molecules and how certain substances behave under these conditions of sub or above 1 atm. I have never tried boiling water on top of a mountain, but now I look forward to that moment. 

-Peace out