Grade 7 science is a class where we learn about science while we are in grade 7. Out of all the things we had to do in this class, the project which was the most fun was the Asteroid mining essay I wrote, which was about the pros and cons of asteroid mining. This was very fun as we had to do lots of research about this new idea. I found our project where we checked what nutrients were in a particular food the most interesting, as I did not expect the results I got. I found the tests the most challenging this year. My biggest area of improvement was the fact that I have gained some confidence in science class, and I have found that science class was more fun this year than last year. I suspect this is something to do with either the jokes or sarcasm of Mr. Fedley. I am hoping to improve my hypothesis and experiment write-ups as they lacked detail
Recently, in class, we have been learning about light. Thus, I have chosen to do a little research into glasses, mainly because I have to wear glasses to actually see with one eye… my left eye can barely see. Since we are researching light, I have chosen to explain reflection and refraction. Reflection is where light bounces of an object, like a mirror. Refraction is where light goes through an object, such as water, and bends. Glasses use refraction to bend light so an dysfunctional eye can focus on an object, similarly to binoculars. Here is an image on how the lenses on glasses work:
The first glasses were made in the late 13th century by an italian friar. These worked in a similar fashion to modern glasses. But as early as the 5th century BCE, Egyptians were using lenses to magnify vision. The roman emperor Nero used an emerald as a lens to view the gladiatorial fights in the coliseum in greater detail. There are some limitations with glasses, as your peripheral vision is constantly out of focus, giving you a downside in many things. Also, glasses are rather breakable. Glasses work by refracting light into your retina in a way so that the retina can see in a different way . In other words, it works as a second lens for the eye. It allows your retina to see in a more adjusted fashion if an lens in an eye cannot fatten/thin out. Thus, they are really useful. There are some really interesting things about glasses as well, such as the fact that some glasses somehow manage to stop the light from computer screens by a bit and apparently reduce damage to your eyeballs. Glasses also can be made out of polycarbonate, an material which can withstand a direct hit from a hammer. It is really strong clear plastic. It is really really strong. Glasses are the precursor to contact lenses, which are essentially additional lenses which you can add to your eye.
Sources for this document:
Wikipedia contributors. “Glasses.” Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 4 Jun. 2013. Web. 6 Jun. 2013.
The project which I am most proud of this year is my essay on Alzheimer’s disease. I chose my essay because I am rather proud of it, sinceI did a large amount of research on Alzheimer’s disease, and I think I got a fair bit of interesting data about this disease, which we know very little about. For this project I got a 7 out of 8, which is actually very good. A 7 or an 8 is similar to an A in other schools. This is the link to the essay. I am very proud of it, and this essay is the one I have chosen to show my family for the student-led conferences.
In class we had to answer the questions below. My answers are added too. Please don’t copy.
Question 1. What is an atom? Describe the different parts and state where they can be found in an atom. Answer here: an at0m is the smallest thing possible which you can see under a microscope.
Question 2. What is an element? Give three examples of an element and give a use in the real world for each of these elements. Answer Here: an element is a substance which contains only one kind of atom. Elements cannot be broken down into simpler substances in a laboratory.
Example 1:Oxygen. this is also called air. we need this to breath
Example 2:Gold. we use this for making electronics and jewelry
Example 3:Carbon. we use these for pencils, diamonds and other stuff.
Question 3. What is a molecule? Give three examples of a molecule and give a use in the real world for each of these elements. Answer Here: a molecule is a group of two or more atoms bonded together, yet there can be two or more of the same type, such as H2O.
Example 1:water. we need this to keep hydrated, so we drink it.
Example 2: Aspirin. these are painkillers commonly used when you get a headache.
Example 3: Salt. we put these on potato crisps which we eat.
Question 4: What is a compound? Give three examples of a compound and give an use for each one. Answer Here: A compound is a mixture of two or more atoms which are not the same.
Example 1:water. we drink it
Example 2:aspirin. we use these to halt the symptoms of headaches slightly
Example 3:salt. making potato crisps and ketchup taste better
Question 4: What is a physical change? Give an example. Answer Here: a physical change is a change in state for a substance.
Example: Water to Ice.
Question 5: What is a chemical change? Give a few different examples. Answer Here: a chemical change occurs when a new chemical or substance is formed.
Example: Magnesium+Hydrochloric Acid= Hydrogen+ Magnesium Chloride
Example : Hydrogen+Oxygen+Hydrogen= Water
Unfortunately, I cannot find out how to embed the google presentation to this doc, so we linked it, and put it up as a link to a gdoc. DO NOT REPUBLISH! OR I SHALL SUE YOU! I MEAN IT!
Recently, we have managed to dissect a pig heat so we can find out how it works. this is a presentation on how the heart works!
Recently, in science class, we have been doing experiments on foods. I chose a tesco ginger nut biscuit. We had to test our food in different tests which utilize benedicts solution, biuret solutions A and B, Iodine, and filter paper. on average, I spent about 5-7 hours total on this project. our tests were to find out wether a food contained Starch, Glucose, Protein, and Fat, the most important nutrients we need. Well, Ice Cream is valued nutrient 5, but that is not included in the test. In these experiments, we learned many things about digestion:
1. we learned that the human digestive system digests glucose the most quickly.
2. we learned that fats contain more energy than any other type of nutrient.
3. we learned that without any of the vital nutrients, we die
I am proud of my “food-write-up sheet” because I filled in all of the data which was needed. If i could do this assessment again, I would choose an food which is not orange, since that may have changed a couple of tests.
The science behind the boat was the force of gravity pulling it down. For things which float, there needs to be an upthrust which is equal to the force puling it down. Then, there is also the matter of displacement of the water. if a boat is heavy, it displaces more water. and if a boat is less heavy it displaces less. if you put “atoms” in the boat it gets heavier and it displaces more water and if it displaces too much water, it comes over the sides and the boat sinks. if you want a more detailed explanation go to brainpop and look for a video on floatation. They explain it better than me.
My boat was good because it was shaped like an canoe, however, I think I could have improved it by making the sides higher.
Photos were taken by Sena during science class with alex’s iphone. Sena’s boat held the most “atoms”. the “atoms” were plastic balls to make model molecules as atoms. so the red would be oxygen, and so on. My boat held 16 atoms. sena’s held 36 and I forgot how many alex’s held. overall, i think that sena is best at building foil boats.
AIM: To make the highest tower possible out of 20 straws and 60 cm of tape. The tower should be able to be able to support a mass of 20g.
One of the things which was bad about our tower was that it kept falling over. However, a good part was that the triangles in the structure prevented it from crushing itself. It held 70 grams before collapsing. It collapsed at 80 grams.
Next time, I would use less tape and not waist the tape on “structural supports” which were my idea which did not work. that is about it. We should also not put a large and heavy structure on the top. even though it is stable.
today my science class dissected some flowers. this is what my group ended up with… I wonder if we should have not dissected 50% of all stamen to look at pollen.
Stamen: the male sex organ of plants, made out of 1 anther and 1 filament. There are at least 5 stamens per flower. bees collect pollen from this
carpel: the female sex organ of plants
pollen: male sex cell
of plants. It is shown here and it is magnified by a hundred times.
ovule: un-firtilized seed. They are located in the carpel.
seed: firtilized seed.
sources: brainpop and Ms. Leatham and the science book