Lab Report 1 2015 Essay

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Lab Report 1

To develop an understanding of the metric system and use it to measure common objects. To also learn about how to report uncertainty in your measurements.

Lab Observations
Most flat objects do not consist of uncertainty. When we measured round objects, because of its shape, it contained uncertainty.

Lab Answers
1. Using a metric ruler, determine the length of the items in Table 1.1 below: In the final column, you are to estimate your measurement precision. To do this, measure each item a second or even third time. How close are the measurements? If there is a range of values for the length you measure, record the average difference between measurement values as your uncertainty. If your measured value for
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Fill in the blanks in Table 1.7.

Table 1.7. Population growth.
Number of Bacteria
First exceeds
30 min
1 hour
2 hour
2 hr 15 min.


Lab Report 2

The ph of a solution is a measurement of its acidity. A low value of ph corresponds to the solution acidic. Each enzyme has a pH at which the rate of the reaction it catalyzed is optimal. Catalase is common enzyme present in most cells. It speeds the breakdown of hydrogen peroxide into water and oxygen gas. For an enzyme or a molecule to be considered a catalyst for a reaction, it must increase the likelihood of the reaction taking place and much not itself be used up in the reaction.

Lab Observations

Lab Answers

Fill in the following table by comparing all cups using relative terms to describe the bubble activity in each cup.

For example, observations could be described using the terms: No bubbling, moderate bubbling, good bubbling, and very good bubbling.

To describe average bubble size use the terms: very small, small, large, or very large.

To describe pH without access to pH detectors, simply use the pH chart earlier in this chapter to describe each as acidic, neutral, or basic.

To describe the catalase activity, use your data on the size and amount of bubbles produced to estimate the amount of gas produced in the catalase-mediated process using the following terms: very low, low, moderate, high, very high.

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