Ms. Leland conducted many three test that all had combustion. The first demonstration was where the took and poured a little bit of ethanol and coated the walls of the bottle with ethanol. Then once the bottle was prepared fully she lit a flame at the end of the bottle and there was a blue flame that entered into the bottle and shot it back. This happened, because all of the ethanol that turned into gas evaporated and shot it back off of the table.
The second test, was she took vinegar and baking soda and put them into a beaker and covered it with her hand, so there was not the reaction where it shoots out but it still reacted. Then she lit two candles and she took the beaker and put it over the candles and they went out. This happened, because the vinegar and baking soda takes a lot of carbon dioxide and candles need oxygen in order to maintain a flame and the candle were instantly put out.
The third test, she filled a beaker with hydrochloric acid and put about two grams of zinc into the beaker. The reaction was instant and the beaker began to bubble, because the zinc began to dissolve and she lit a flame on top of the hydrochloric acid and it caught on fire. This happened, because the hydrogen is VERY flammable and it basically ignited and kept a consistant spiral flame.
Thursday, November 17, 2011
Monday, November 7, 2011
Chemical Reactions and Heat Lab
My hypothesis is, how does the rate of chemical reaction change by the increase of temperature?
Results:
Hot water test-20 seconds- 50 degrees C
Room temp. water test- 27 seconds- 25.1 degrees C
Cold water test- 1 minute and 56 seconds- .8 degrees C
This is the chart that shows our results
of the different water temps.
My hypothesis was correct and the amount of chemical reaction does effect the temperature, because in our test the temperature was changed by the amount of chemicals added to the water test used.
Results:
Hot water test-20 seconds- 50 degrees C
Room temp. water test- 27 seconds- 25.1 degrees C
Cold water test- 1 minute and 56 seconds- .8 degrees C
of the different water temps.
My hypothesis was correct and the amount of chemical reaction does effect the temperature, because in our test the temperature was changed by the amount of chemicals added to the water test used.
Thursday, November 3, 2011
Freezing and Melting Temperature of Water Lab
In this lab we were testing the temperatures of when we were freezing the water into ice and when the ice was melting into water. My hypothesis is that, if I test the two waters, then the freezing water will be colder than the melting, because of the ice.
Results and Diagrams:
This is the results of the Freezing test
This is the results of the melting part of the lab
This shows how the two graphs compare to one another
This is when the test tube was frozen
This is the ice after the 5 minute waiting period
This is the ice as it began to melt
This is the ice as its almost completely melted
As we began to add the salt, the temperature rapidly began to decrease with the ice inside of the beaker. Then after a fifteen minute period, the ice in the test tube had froze, then we left the frozen ice tube out on the table and the temperature increased, but once we put it into the warm water, it melted. These are all shown in the photos above.
Results and Diagrams:
This is the results of the Freezing test
This is the results of the melting part of the lab
This shows how the two graphs compare to one another
This is when the test tube was frozen
This is the ice after the 5 minute waiting period
This is the ice as it began to melt
This is the ice as its almost completely melted
As we began to add the salt, the temperature rapidly began to decrease with the ice inside of the beaker. Then after a fifteen minute period, the ice in the test tube had froze, then we left the frozen ice tube out on the table and the temperature increased, but once we put it into the warm water, it melted. These are all shown in the photos above.
1. What happened to the water temperature during freezing? During melting?
The temperature rapidly decreased once we began to freeze the test tube, and the temperature rose slowly as it was set in the warm water.
2. According to your data and graph, what is the freezing temperature of water? The melting temperature? Express your answers to the nearest 0.1°C.
Well the temperature in Celsius when the water freezes is 0 degrees Celsius, and once the temperature is above the 0 degrees point I believe that the ice begins to slowly melt.
3. How does the freezing temperature of water compare to its melting temperature?
The temperature of the water when it was frozen, just stayed right below freezing and maintained about the same temperature throughout the test. The melting temperature was a lot warmer and changed the entire time of the test.
4. Tell if the kinetic energy of the water in the test tube increases, decreases, or remains the same in each of these time segments during the experiment.
a. when the temperature is changing at the beginning and end of Part I Decreased
b. when the temperature remains constant in Part I Remains the same
c. when the temperature is changing at the beginning and end of Part II Increased
d. when the temperature remains constant in Part II Remains the same
5. In those parts of Question 4 in which there was no kinetic energy change, tell if potential energy increased or decreased.
The potential energy is always increasing no matter what the temperature is.
Tuesday, October 18, 2011
Greatest Discovers in Chemistry
The main overview of these videos is to explain what make up our world, that we cannot see with the naked eye. The first great discover was oxygen that Joseph Priestly was searching for new airs/gases. And he conducted a test by using the substance mercury, that is a liquid and metal. So he puts some mercury into a jar and super heats it by placing a hot jar over the exit of the glass orb and shines a magna fine glass on it as well. The mercury begins to change and it emits a gas from the jar. But he wasn't sure of his discovery until he visited France in 1774 and met with another scientist and they conducted the test once more. Then he explains that it had emitted oxygen, so Priestly had discovered and invented oxygen.
The next great science discovery was the Atomic Theory. John Dalton, a british school teacher, was fascinated with chemistry, and he came up with the idea that each element is made up of smaller, invisible pieces of matter. The named these microscopic pieces of matter, atoms that were supposedly the ultimate particles. From his studies, Dalton had developed his own Atomic Theory explaining the relationship between atoms and the elements. These atoms explain to other scientist how the elements work and it is a truly simple system.
The third greatest discovery in the video was how atoms combine into molecules. In the early 1800's it was found that if you turn two atoms together it increased the amount of the element that you had. It was first believe that gases were made up of single atoms and it was proved wrong. Gases were actually made up of multiple atoms that became molecules. By finding out that they became molecules, this meant that scientist were able to make new compounds.
Synthesis of Urea was founded when Frederick Volder put two organic substances into a glass container and the outcome was a gram of crystals. He had made Urea out of two organic substances that is found in Urine and he made them without a kidney.
Chemical Structure is the next discovery, and a discover was made to show how to create chemical substances. The diagrams were made with their atomic symbols and lines to show the relationship between the two elements. Last year, there were 15 million new compunds found.
In 1869, Dmitri Medeleev created the Periodic Table, while trying to create a simpler way of organizing the elements, by making them into a table where the elements are paired together by there similarities. This table would later help all scientist like notes help a musician.
The next great science discovery was the Atomic Theory. John Dalton, a british school teacher, was fascinated with chemistry, and he came up with the idea that each element is made up of smaller, invisible pieces of matter. The named these microscopic pieces of matter, atoms that were supposedly the ultimate particles. From his studies, Dalton had developed his own Atomic Theory explaining the relationship between atoms and the elements. These atoms explain to other scientist how the elements work and it is a truly simple system.
The third greatest discovery in the video was how atoms combine into molecules. In the early 1800's it was found that if you turn two atoms together it increased the amount of the element that you had. It was first believe that gases were made up of single atoms and it was proved wrong. Gases were actually made up of multiple atoms that became molecules. By finding out that they became molecules, this meant that scientist were able to make new compounds.
Synthesis of Urea was founded when Frederick Volder put two organic substances into a glass container and the outcome was a gram of crystals. He had made Urea out of two organic substances that is found in Urine and he made them without a kidney.
Chemical Structure is the next discovery, and a discover was made to show how to create chemical substances. The diagrams were made with their atomic symbols and lines to show the relationship between the two elements. Last year, there were 15 million new compunds found.
In 1869, Dmitri Medeleev created the Periodic Table, while trying to create a simpler way of organizing the elements, by making them into a table where the elements are paired together by there similarities. This table would later help all scientist like notes help a musician.
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