Essay on Biology Lab for virtual school.. Lesson 1.04

9. Each of the other solutions is already approximately 0.1 M. With these solutions you can pour a small

7) Add pennies dated 1982 to present into the Ziploc bag until the hair strand breaks.

water during the equilibration period of 10 minutes. Vials 1,2, and 3 should be in the bath containing water at

This project explores the effectiveness of various cleaning solutions in cleaning tarnished and oxidized coins and the question that is trying to be solved is to find the best cleaning solution. If pennies are placed in lemon juice, apple juice, water, and baking soda paste the penny with the cup of baking soda paste will be the cleanest. My data is what was recorded during the experiment.

In conclusion, my hypothesis that the water would have the most drops on the penny was proven to be correct. Two factors that led my hypothesis to be true was surface tension and learning how cohesion works against gravity and sticks to vessel walls. This experiment was very beneficial in understanding

Have you ever wondered why your cereal clusters together after milk is poured or why it sticks to the side of your bowl? Even if you try to pull them apart, they come together again. This is a spectacle that happens every day but we just don’t really notice it. Most people don’t really realize that it’s happening everyday. Using fluid mechanics, we can determine why floating objects come together due to surface tension, viscosity and buoyancy (Grayson, 2014).

6. After using it, rinse and dry your toothbrush very well taking care that no food residue or paste remain.

1. 10 drops of 1 M K2CrO4 was added to the solution and stirred for about 10 minutes.

At first, our first recording was unsuccessful due to our lab losing count of how many drops were supposed to be applied to the surface, but we discovered that the penny could hold up to 20 drops of distilled water on its surface during the second try. Right after we recorded our results, the water spilled over and we cleaned the spill from our table for our next experiment.

4. If this does not take care of the stain, the entire board will need to be refinished or replaced.

Wear the proper safety laboratory equipment before starting the experiment. Use a wire sponge to clean the brass key and copper strip. Mix 3 grams of NaCl solution with 15 mL of of vinegar in a 250 mL beaker. Wash the brass key and copper strip in this NaCl and vinegar solution. Use distilled water to rinse the brass key and copper strip. Use paper tissues to dry the brass key and copper strip. Use a top loading balance to determine the mass of both the key and the copper strip. WARNING: The electrolyte solution used in this experiment contains H2SO4, an acid, so the solution should be handled with care. Fill ¾ of a 250 mL beaker with the electrolyte solution. Attach a 7 cm of a wire of copper onto the brass key. This acts as a handle for

5. Finally, close of the containers with rubber plugs so nothing goes in or out of the three chambers

Add 2 drops of soap to the removed test tube, and place it in the test tube holder.

Sample/solution ratio is 1/50. The apple slices were placed inside the bucket containing the solution but were seen floating so loads such as

7.When water bath is ready, put each test tube into the water bath. Wait 5 minutes.