Experiment

In Glogpedia

by kmsal64
Last updated 6 years ago

Discipline:
Science
Subject:
Experiments
Grade:
7

Toggle fullscreen Print glog
Experiment

EXPERIMENT

Our Question

?

?

Our Equipment

Method

What did we do?

My Prediction

What I think will happen?

If we follow this procedure, the old container of chicken broth will have much more bacteria in it.................................................................................................................................................................................................................................................................................................

What will happed if I fill two containers with chicken broth, one opened and one closed, and we observe how the broth changes over time? Will we see bacteria growth, if we record data daily for an increment of 1 week?

Louis Pasteur, a french Chemist of the 19th century, proved, disproved, amd developed many theories such as vaccination, fermentation, and pasteurization. One of Pasteur's most famous experiments was when he helped disprove spontaneous generation. Pasteur filled two flasks with broth. He allowed one to be in direct contact with air by making the top directly vertical (bacteria particles were able to float in), and one to be in contact with air, but the neck of the flask was curved so tiny bacteria would not float in the broth but would get stuck in the groove of the neck. After a few days, Pasteur noticed that the broth in the flask with the curved neck was bacteria-free, while the flask with the straight neck had accumulated bacteria. This disproved spontaneous generation because Pasteur concluded that the bacteria was not made by the broth itself, but originated from outside the straight-lipped flask, and had floated in.Our class conducted a similar experiment with identical results. WE had hypothesized based on the findings of Louis Pasteur that the container that the container that could allow bacteria to float in would eventually be filled up with it. We examined the broth of the clean and dirty containers under a microscope and noticed that the broth from the open solution was actually darker, and we could see the build-up of bacteria in it. This was a great contrast when compared to the clearner-looking solution which was not vulnerable to bacteria. David and I noticed that there were many tiny air bubbles in both solutions, but the cleaner solution had a lighter beige shade. In all, this experiment first tested by Louis Pasteur helped our class disprove spontaneous geneartion because we concluded that bacteria had not been produced by one of the solution, but had come from an external environment to attack it.

1. Mrs. G opened and left an unsealed container of chicken broth on the counter of the lab prep room starting on January 3rd.2. On Friday, January 9th, students will open a fresh new container of chicken broth.3. Students will then examine both samples and comare them.4. Students will take notes and observations, and will take photos if it is helpful for the comparison.5. Students will compare both samples under the microscope.6. Students will attemp to get a photo of the samples underneath the microscope; they mustbe sure to note the magnification in order to recieve full credit.

Results

What happened ' Why?


Comments

    There are no comments for this Glog.