Chemical Reactions

Chemical Reactions happen when there is a color change, heat change, gas produced, and precipitate is formed. Precipitate is a solid that settles out. The parts of a chemical reaction are the reactants, substances that interact and are on the left side. The formula for that is Zn + 2HCI--------- ZnCl + H2.
The five general types are:

-synthesis
-decomposition
-single displacement
-double displacement
-combustion

Periodic Table

In Science class we are learning about the periodic table of elements.The Periodic Table is an organized way to put the elements together. The difference between a group and a period is that groups are vertical and the periods are horizontal. The periodic table is organized by the atomic number.

Flame Test Lab

Potassium:Kno3-purple

Cobalt:Cocl3-orange

Strontium:Sr(Wo3)-red

Barium:Ba-yellow

Copper:Culc2-green

Lithium:Li-red

1.) The liquids might fall into the burner. This causes the color to not be accurate.
2.) It was difficult to figure out, because the flame was the same color as another one.
3.) It is valid, because the flame could be the same color for more than one substance.
4.) By the different substances.
5.) Sr, Ba, Co, Cu, K
6.) I think that the chemicals have to be heated in the flame before the colored light comes out, because the flame would just stay the same and nothing would change.

Law of Conservatioon of Matter

In this lab, we did three trials, measuring the mass of before and after we tested the liquids. The difference between the masses before and after was about one gram for each trial. We observed the mixture and for all of them, it was either sizzling or clear. After we mixed them together, we took the cover off of the water bottle and measured the mass once again. The mass went down a gram for each trial. It was interesting how the mixtures changed in each trial.

1,)The color and the look of it changed. It was bubbly, and sizzling and then it calmed down.
2.)From the mass of the reactants to the mass of the products, the numbers go down.
3.)No, because it kept changing. The products of each experiment changed; it decreased.

Refllection for Article and Video

All of the elements of the Universe came from the stars and planets. The stars are made of different things in which caused the different elements to be formed. The big bang theory led to the Universe being formed. The Universe was just a small thing 16,000,000,000 years ago. Without the big bang theory, the Universe would not have been formed.

Our Universe was thought of as a singularity. People think that singularities are the core of black holes. And black holes are in our Universe. The Universe is cooling while we are in it. This is what they know about how the Universe was formed.

Scientific

Scientific Observations

 

 

In this lab, we had to test different liquids. We put different things in, such as tin foil. To me, this lab was interesting.

 

1.) The temperature of the water was 21 degrees Celsius

 

2.) When we put the copper chloride into the beaker full of water, turned green right away and it was sitting on the bottom. The temperature was still 21 degrees Celsius

 

3.) Next we put tin foil into the beaker. The aluminum started coming off in the water. The next day, the foil dissolved.

 

4.) We then filtered the liquid with a funnel into the flask. it came out clear and we poured it into the test tube.

 

5.) Next we put 10 mL of nitric acid into the test tube

 

6.) It was bubbling in the test tube 



Oreo Cookie Lab

Oreo Cookie Lab

Sarah,  Pentucket H.S.

September 12,2013

 

We measured the filling in three types of Oreo cookies to determine if filling amounts matched the advertisement.

 

Hypothesis: I think that the mass of all three will be different. All of the densities will be different too.

 

Method:

1.) Measure just the cookie part without insides

2.) Measure regular Oreo and subtract the mass of the cookie, then repeat with the double and triple.

3.) Calculate if the advertising is right

 

Results:

Regular- 8.33 for cookie

               3.27 for cream

 

Double: 14.5 for cookie

              6.17 for cream

 

Triple: 17.29 for cookie

            8.96 for cream

 

 

Conclusion: I thought this lab was interesting and from the results it matched the advertising. Overall this lab taught me a lot. 

Do Bowling Balls Float or Sink?

In this lab, we had three bowling balls of which one sunk, one floated and the last one stayed in the middle. We measured the circumference of each and then we calculated the volume and radius. The results were about the same and were all pretty c lose. This lab was very interesting to me.