Introduction- The purpose of this lab was for us to get familiar with the labratory
and to make observations of chemical change
- we hypothisize that there will be a chemical change when you add the salt. We're not sure why but we think a chemical reaction will happen.
- copper(II) sulfate pentahydrate- caution, toxic substance scoopula
- 100 ml graduated cylinder
- stirring rod
-thermometer
-small aquare of alluminum foil
form a lab group of 2 or 3 people
-go to your lab station after taking all appropriate safety precautions we have discussed in the safety lecture.
- you must wear safety goggles and apron.
-fill beaker with 75 to 100 ml of water
-use the scoopula and scoop one scoop of copper sulfate
-stir with the stirring rod until the copper sulfate is dissolved
-loosely crumple tin foil and put it in the mixture
-stir for 15 seconds
-add one scoop of salt into the mixture
-stir the mixture until the salt is dissolved
-observe the reactions
Data
-We observed many chemical changes during the lab.
-When we added the salt the tin foil turned red and fell apart and sank, also the temperature of the water went up to 34.5 degrees, before it was staying at 23.5 degrees celcius.
Disscusion
- The tempeture of the sulfate water increased by more than 50%. And the tin foil turned to copper in a matter of minutes.
- I learned that the formation of a precipitate is an indicator of a chemical change. This applies to real life in different ways, any time a precipitate is formed, there is a chemical change.
Conclusion
- We accept our hypothosis that a chemical reaction would happen. It is proved to be a chemical reaction because there was an increase in tempeture, formation of a precipitate, and a change in color. These are all indicators of a chemical change.
- An additional discovery we made was that the salt seemed to stick to the tinfoil when we first poured it. whether that is because of the moisture on it or somthing else.
- One question we had was what the precipitate was. Is it rust or copper.
positive= good start pretty detailed procedures
ReplyDeletecritisism= needs some work, blogs not done yet
+The pictures were great!!!!
ReplyDelete- It is missing the hypothesis and background information, as well as a conclusion, the more information, the better someone off of the street could understand it.
+Awesome pictures I understood what was going to happen and go on :)
ReplyDelete-Could have done with a little more information doesn't look like time was spent
GREAT JOB though :))
WHOA!!! Love the pics!! they are nasty! could use a little bit more background information. :D
ReplyDeleteHoly Cow!!!! Those Pics are sick! Nice job! More info would do a lovely job...
ReplyDeletepositive- really like your pictures.
ReplyDeletenegative- you need more background info..
Your blog has a lot of great information and pictures. We noticed a spelling error. It could use a bit of color or something to jazz it up. Nice job, awesome blog dawg!
ReplyDeleteI love your outline! However i don't really like your background color it just seems too dark maybe add some color to the words to liven it up!
ReplyDelete