chem 2 lab 0404 Essay

The main objective of this experiment is to differentiate between a physical change and a chemical change.

In conclusion, this lab was a failure. Not only was the yield very small upon inspection, but the product’s composition was unknown due to the unknown solution. Given the nature of the lab, little yield was expected and observed, making the lab itself very particular in nature. Add to this the addition of the unknown solution and any produce was astounding. Not only unfortunate, the unknown solution was very dangerous. If it had been some solution that reacted violently with the reagents, there could have been unforeseen damage done to the lab and the individuals

20) If the solid is still not dissolved, add a tiny amount of hexane and swirl again.

B. Predict (in a general sense) the net direction in which dissolved molecules will move given information about their concentration

During the experiment, two different techniques to disturb systems at chemical equilibrium are utilized. The first one is changing the concentration of one of more species that are involved

Scarring, effects of poisoning such as vomiting, drowsiness or seizures. Respiratory problems from drowning, suffocation or poisoning.

8. Repeat step 7 with H2SO4, except that you should use a 10 mL graduated cylinder of H2SO4 and adding 15 mL water.

A reaction has an equilibrium constant, Keq, of 50. When performed in the presence of an appropriate enzyme, the forward rate of reaction is increased 20-fold. What will happen to the reverse rate of reaction?

Hydrochloric acid (HCl) has risks as it is a corrosive compound. Corrosive compounds, including HCl, can cause injuries such as burning and eating away skin and eyes. To prevent such injuries, do not come into physical contact with HCl. Wear safety glasses, safety gloves and lab clothing.

Purpose: The purpose of this experiment is to observe a variety of chemical reactions and to identify patterns in the conversion of reactants into products.

3. A student wanted 20.000 g of a salt. Which balance should the student use in order to

2. Explain why increasing extracellular K_ causes the membrane potential to change to a less negative value. How well did the results compare with your prediction? _______________________________________________________________________

1. Using the information provided in the Introduction and your observations from Part 1, hypothesize as to the type of electrolyte the following solutions would be. Justify the hypothesis from a chemical standpoint.

In this experiment, a saturated calcium sulfate was already made and ready to use. 25.00 mL of this solution was then mixed with 10 mL of an ammonia buffer and 1 drop of

HCl is known as Hydrogen chloride in its gas state, but when in the presence of water, it is known as hydrochloric acid(PubChem). Hydrochloric acid is extremely corrosive and has uses in both laboratories and industrial settings(PubChem). This acid can cause short term complications such as irritation to the eyes and nose or it can leave long term effects like dermatitis and chronic bronchitis (PubChem). Sodium hydroxide is a base that neutralizes acids and when in liquid form it has a higher density than water (PubChem). The compound is used in various textile industries (PubChem). NaOH can be corrosive to metals and is toxic if ingested (PubChem).