In this lab we had to make observation about a green thing which is Copper Chloride before we add things to it to see what will happen. That was the first procedure we had to do on the lab. The Green stuff looked like was green,looked like sand and had like little woods in it. When we added the water to it we used a beaker and added 25ml of water. The water turned blue, there was a green spot at the bottom and the green stuff was dissolving when we were stirring that's a physical change.When we dropped the green stuff on aluminum foil, it started bubbling, the foil turned black and the green stuff became solid. when we teared the aluminum paper in piece and we put it in the container that had the green stuff on it , the aluminum foil burned, it was bubbling,vapor was coming out and you could smell something.
In this lab i determined that the properties of the green stuff is physical because the color changed, when i stirred the green stuff into water it dissolved that's a physical change. I didn't go through chemical change.In this lab the solid were the tiny pieces of aluminum foil, the liquid was the water and the solution. The gas was the vapor that was coming out when the chemical started to steam and bubble.
The material relates to what we have done in class because at the beginning of the year. You did a demonstration of the balloon in each different phases and when you put it next to the heat the balloon pop.One question that i had while doing this lab was, if we add another thing instead of water in the chemical is the color of the thing will still change ? will the aluminum foil still bubble ?
Enrichment.
what will happen if you add Copper (ll) Chloride to Zinc ? will it react ?
Result :
Zn + CuCl2 --> ZnCl2 + Cu
displacement reaction
solution turns from blue to colorless. pink solid observed.
Thursday, September 22, 2011
Lab 1-3 Separation of a Mixture
In this Lab we had to do a mixture of sand,salt, and iron and the total mass of the mixture of the three things had to be about 50 grams. We used the Electronic balance to measure the mass of each things, we put it into the cup and mix it all together. After that we had to come up with a plan of how to take all of each things out, how to separate all of them. To separate the Iron from the other things we use the magnet to get the iron out because the iron is magnetic, then we put it in the cup and weighed it to get the mass. Then we place the other two sand and salt into a beaker, added water,stir and the salt dissolved. we used a filter paper to filter the sand from the salting water and then we put it into the microwave to dry it. Then the salting water was in a beaker we heated it up and the salt turned back to solid and then we weighed it and we also weighed the sand.
In this lab, the amounts of sand that we had at the beginning was 23.78% (10.52 g), the amount that we recovered was 11.45g. It wasn't equal we probably didn't recover everything when we were filtering the sand from the salting water.For the Iron we had at the beginning 49.71% (22.00g), the amount that we recovered was 22.78g i think its bigger because we might have took some sand out too when we were taking the iron with the magnet or maybe the magnet already had some iron on it, i think if we had did it twice we were not going to have this amount of Iron when we were recovering it.The salt was 26.47%(44.23g) at the beginning and at the end it was 22.78g isn't equal maybe because when we heated it,the mass went down or maybe because it went from a liquid phases to a solid phases.
In this lab,If there was tiny pieces of sand in our Iron what we could have done was take everything off the magnet and put it in the cup and retry again. After we could have try to use our hands to take the little tiny pieces of sand that we could see and try again with the magnet for the last time.Or if there was iron on are magnet we could had used a Ziploc back it was going to help to get the iron off the magnet.
The lab is related to what we're doing in class, because you had to measure the mass, find the %Error,also the % of total which is what we're currently doing in class, mixture and pure substances. The Question that i have is did we did this lab to get better with measurement and solving math problems or to understand how purification work.?
Enrichment : Steps used for purification of water since water is a chemical.
-Aeration
-Flash mixing
-Flocculation
-Settling
-Filtration
-Additives
In this lab, the amounts of sand that we had at the beginning was 23.78% (10.52 g), the amount that we recovered was 11.45g. It wasn't equal we probably didn't recover everything when we were filtering the sand from the salting water.For the Iron we had at the beginning 49.71% (22.00g), the amount that we recovered was 22.78g i think its bigger because we might have took some sand out too when we were taking the iron with the magnet or maybe the magnet already had some iron on it, i think if we had did it twice we were not going to have this amount of Iron when we were recovering it.The salt was 26.47%(44.23g) at the beginning and at the end it was 22.78g isn't equal maybe because when we heated it,the mass went down or maybe because it went from a liquid phases to a solid phases.
In this lab,If there was tiny pieces of sand in our Iron what we could have done was take everything off the magnet and put it in the cup and retry again. After we could have try to use our hands to take the little tiny pieces of sand that we could see and try again with the magnet for the last time.Or if there was iron on are magnet we could had used a Ziploc back it was going to help to get the iron off the magnet.
The lab is related to what we're doing in class, because you had to measure the mass, find the %Error,also the % of total which is what we're currently doing in class, mixture and pure substances. The Question that i have is did we did this lab to get better with measurement and solving math problems or to understand how purification work.?
Enrichment : Steps used for purification of water since water is a chemical.
-Aeration
-Flash mixing
-Flocculation
-Settling
-Filtration
-Additives
Monday, September 19, 2011
Lab 1-2 Indirect measurement
Summary of the experiment:
In this Lab, we had to find to determine the thickness of three different object : aluminum foil , heavy aluminum paper and a copper wire. We were asked to find our way to determine the thickness of the three objects. We used the formula D= m/v for each tests. We used the References table to find the density and the scale to determine the mass and we plug it the numbers. The thickness of the aluminum foil is less than the thickness of the heavy aluminum paper.
There are limitation when you use the ruler to calculate the thickness of something , with the ruler you can only measure the length and the width of something and you cant find the height that doesn't help much , and with the water displacement you can find the volume of things but sometimes its inaccurate.
Some sources of error can be if you didn't measure the width or length of the object right and another one is if you didn't plug it the number right into the formula. some people tend to do the math wrong that can explain the error in the diameter value.
One problem that i encounter while doing this experiment was i couldn't figure the height of the aluminum foil because the ruler couldn't measure it. To overcome that i used the formula D= m/v to figure out the volume of the aluminum foil when i found the volume i plugged it in the formula v=l.w.h, i already found the length and the width of the aluminum foil i plugged it that too and put an x for h and i solved the problem and found the height.
Another Experiment you could use is gas mileage. It's a good example because its like in the experiment, it's something that we can directly measure. However like in the lab we can use the values that we have to figure out the one that we don't have. The values we were able to figure out is how much gas you need and how many miles you can do with that gas.If you're keeping track of how many miles you go ,checked the odometer of your car and how many gas you used. You can divide the number of miles you drove by the number of gallons and you will figure out how many miles you get per gallon.
Mathematical way to figure out which foil gives more value i will first convert the amount of foil in a roll into cm .
Regular foil = 70 cm x 600 cm
Heavy duty foil = 40 cm x 1500 cm
I will then multiply the amount of foil in roll times the thickness using the formula : v= l.w.h
- Regular foil : 70x600x0.0017 = 71.4 cm3
- Heavy duty foil: 40x1500x0.0023 = 138 cm3
Then use the Volume and divide it by the price
- Regular foil : 71.4 / 5.79 = 12.331
- Heavy duty : 138/ 3.79 = 36.411
The heavy duty gives us more value than the Regular foil.
In this Lab, we had to find to determine the thickness of three different object : aluminum foil , heavy aluminum paper and a copper wire. We were asked to find our way to determine the thickness of the three objects. We used the formula D= m/v for each tests. We used the References table to find the density and the scale to determine the mass and we plug it the numbers. The thickness of the aluminum foil is less than the thickness of the heavy aluminum paper.
There are limitation when you use the ruler to calculate the thickness of something , with the ruler you can only measure the length and the width of something and you cant find the height that doesn't help much , and with the water displacement you can find the volume of things but sometimes its inaccurate.
Some sources of error can be if you didn't measure the width or length of the object right and another one is if you didn't plug it the number right into the formula. some people tend to do the math wrong that can explain the error in the diameter value.
One problem that i encounter while doing this experiment was i couldn't figure the height of the aluminum foil because the ruler couldn't measure it. To overcome that i used the formula D= m/v to figure out the volume of the aluminum foil when i found the volume i plugged it in the formula v=l.w.h, i already found the length and the width of the aluminum foil i plugged it that too and put an x for h and i solved the problem and found the height.
Another Experiment you could use is gas mileage. It's a good example because its like in the experiment, it's something that we can directly measure. However like in the lab we can use the values that we have to figure out the one that we don't have. The values we were able to figure out is how much gas you need and how many miles you can do with that gas.If you're keeping track of how many miles you go ,checked the odometer of your car and how many gas you used. You can divide the number of miles you drove by the number of gallons and you will figure out how many miles you get per gallon.
Mathematical way to figure out which foil gives more value i will first convert the amount of foil in a roll into cm .
Regular foil = 70 cm x 600 cm
Heavy duty foil = 40 cm x 1500 cm
I will then multiply the amount of foil in roll times the thickness using the formula : v= l.w.h
- Regular foil : 70x600x0.0017 = 71.4 cm3
- Heavy duty foil: 40x1500x0.0023 = 138 cm3
Then use the Volume and divide it by the price
- Regular foil : 71.4 / 5.79 = 12.331
- Heavy duty : 138/ 3.79 = 36.411
The heavy duty gives us more value than the Regular foil.
Thursday, September 8, 2011
About Me.
My name is Manuela I was born in Cameroon ( Africa ), English is my 2nd language and i also speak french. I'm a Junior and I'm 15 years old ,maths and science are two of my favorite subject in school, even that sometimes i struggle in those classes i still push myself and do my best. When I graduate from High school i want to go to Sunny Albany School of pharmacy because i want to be a Pharmacist. Albany School of Pharmacy have a 6 years program so when you get out of the school you are directly a pharmacist.I took Earth Science and Geometry last year and this year i'm taking chemistry because it's one of the class that someone who wants to be a pharmacist should take and my goal is to pass the class with an A+ and also pass the regents with an A+ or A, i learn best when i go home and take a look at what we did in class and read it over. I have 9 siblings 5 brothers and 3 sisters they're all older than me, i just go a little brother who is 13, my mom and my dad live back in Africa and i live here with my uncle. I love soccer, Basketball and Tennis, i wear glasses so the front sit is the best place where i like to be in a classroom so that i wouldn't turn to look at people and i will not be distracted but when you're in the back you see everything in class and you get distracted when you look at what others people are doing.I heard a lot of kids complaining that Chemistry is hard is that true ? But i don't think it's hard students that think a class is hard are the one that doesn't do they work or try their best, hard wok always pay off at the end so i don't listen to them when they say that. I'm in the unity club and RIT step program , the biggest accomplishment in my life was when i had an award for outstanding work throughout the year when i was still an ESL students and i was still learning english. I look forward this year in Chemistry Class and if i like it and work myself through the class without problems but i know i will struggle because if i don't struggle because i get something than I'm not getting it that's how i'm but if i do good in the class i'm definitely taking AP Chemistry next year and i will sometimes need your assistance i hope you will be able to assist me and help me thank you.
Sincerely,
Manuela Namba
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