Category Archives: Science 10

Reactions

Posted on by
Reply

In our science class, we did a few experiments involving chemical reactions, equations and balancing them. The first experiment was with calcium metal and water. We were testing hydrogen gas. We used two test tubes and we had a flame. When the flame came in contact with the gas, it caused the flame to go out and made a loud popping noise. When the hydrogen gas and oxygen were mixed together it created a reaction, which concludes that it worked and we successfully tested hydrogen gas. Next, we were testing oxygen gas with hydrogen peroxide. The glowing splint caught on fire and also created a small popping noise. There was that noise due to how fast the heat and oxygen molecules reacted with each other. This experiment was successful in creating oxygen gas. The last experiment was testing carbon dioxide gas using carbonate and hydrochloric acid. When the flame went out when it came in contact with the gas. This was also successful because carbon dioxide takes away oxygen. The flame went out because it needs oxygen to keep burning but it came in contact with the carbon dioxide, which resulted in no flame.

IMG_4117-1tjnnm5

IMG_4116-21p2i7i

IMG_4099-1-2-1ezgy6s

Neurofibromatosis type 2

Posted on by
Reply

neurofibromatosis type 2

neurofibromatosis type 2 is a disorder which is growths of noncancerous tumors in the nervous system. The most common tumors associated with this are called vestibular schwannomas or acoustic neuromas. These growths develop on the nerve that carries information from the inner ear to the brain (auditory nerve). Tumors found along other nerves can also be found. Signs and symptoms usually appear in a person’s twenties but can begin at any age. Most common symptoms are hearing loss, ringing in the ears, and problems with balance. If tumors develop along other nerves, you can experience tumor growths which can change vision, numbness or weakness in the arms or legs, and fluid buildup in the brain. Symptoms vary on the location of the tumor.

Estimated 1 in 33,000 with this worldwide.

Mutations in the NF2 gene cause this disorder. The NF2 gene provides instructions for a making a protein called merlin (schwannmin). It is a protein produced in the nervous system. Merlin asks as a tumor suppressor, it keeps cells from growing and dividing too rapidly. Mutations in the NF2 gene lead to the production of a nonfunctional version of the merlin protein with allows cells to multiply too frequently and form tumors.

This disorder has an autosomal dominant pattern of inheritance. People with this condition are born with one mutated copy of the gene in each cell. In about half of cases, the altered gene is inherited from an affected parent. The remaining cases result from new mutations in the NF2 gene and occur in people with no history of the disorder in their family.

To have this, two copies of the NF2 gene must be altered to trigger tumor formation, But most other autosomal dominant conditions only need one altered copy f the gene in each cell to cause the disorder.

 

 

https://www.ncbi.nlm.nih.gov/books/NBK132145/

https://ghr.nlm.nih.gov/condition/neurofibromatosis-type-2#diagnosis

http://www.mayoclinic.org/diseases-conditions/neurofibromatosis/home/ovc-20167893

 

 

 

 

Scientific Method Bubble Gum Lab

Posted on by
Reply

Conclusion:

Our two hypothesis ended up having opposite results, Gum A resulted in a bigger bubble size but Gum B had more of an ability to stretch. Our first hypothesis was for what brand of gum will be the best at blowing bubbles. “If we chew both pieces for 3 minutes each, then Gum A will blow bigger bubbles because it is thicker” We then tested both brands and recorded our data. We recorded 3 trials for each piece of gum. The average size bubble for Gum A came to 10cm and Gum B came to 3.25cm. We concluded that Gum A was the best at blowing bubbles because it was thick and did not easily break. Our next hypothesis was for gum stretch ability. “If the gum is stretchy then the bubble will be bigger because it will not easily break” Our data showed that Gum B had more ability to stretch. When we tested its ability it stretched to 130cm and Gum A stretched to 49cm. Gum B was able to stretch more in part 2 of our experiment because it was more of a stretchy texture oppose to Gum A which was thicker. Since Gum A’s texture was thick, it made its ability to stretch harder and it didn’t stretch as far as Gum B. When blowing bubbles, Gum A was the best since its texture was thick and didn’t break easily. I think our hypothesis should be refuted because of the opposite results. The 5 variables listed below could have affected our results greatly.

Some variables that may have affected our outcome of this experiment:

  1. The number of times the gum was chewed by each person in 3 minutes. If it’s not the same, it can affect the results.
  2. Having different chewing techniques (speed, etc.)
  3. The speed of pulling in part 2. The person could have been walking back faster while testing Gum A than Gum B
  4. Ability in blowing bubbles
  5. More tests with part 2. We could have averaged it and found a better answer.

Qualitative: Our observations to help write our hypothesis and conclusions.

Quantitative: Recorded our data of the size of bubbles and the length the gum stretched using table graphs.

SI units: There were SI units used in this experiment, centimeters, and grams. We used centimeters to measure the size of the bubble and the length the gum stretched. Also used grams to weigh the gum before we began.

partner: Jayden

(pictures on Jayden’s post)