Below are several choices for your Discussion Question. You need to select ONE a

Question

Below are several choices for your Discussion Question. You need to select ONE and be sure to provide a UNIQUE example. Follow the guidelines. Use proper grammar, complete sentences, cite your sources, include all references.

1. Modern science is responsible for many of the developments, technologies, and breakthroughs that we enjoy in our lives. Select a unique technology/breakthrough and describe the process used to develop the specific technology and the role that the scientific method played in the process.
2. Why is it important to distinguish between accuracy and precision? Provide examples (not used in class) of things that can be accurate but not precise, as well as things that are precise but not accurate. Explain why accuracy or precision are preferred for your example.
3. Provide an example of each type of phase change (not used in class). Provide a unique example and explanation of how humans utilized phase changes in modern technologies.
4. Explain the importance of categorizing matter into elements, compounds, and mixtures. Provide a unique, everyday example for each (element, compound, and mixture) and explain why it belongs in that category.
5. Explain the importance of scientists to use the SI system and maintain standards for SI measurements. Provide an example (not used in class) of an application of SI units and the outcome.

Explanation / Answer

2.

The accuracy of a measurement of a quantity is the degree of closeness of measurement to a standard or known value (true value)

Example :

Suppose in a titration, the titre value obtained by the teacher is 20mL. This value is the standard or known value (true value)

If the titre value of a student is say, 18.8 mL the measurement is not accurate because this value is not close to the standard value.

The precision of a measurement is related to its reproducibility and repeatability, ie precision refers to the closeness of two or more measurements to each other.

If the student gets the same titre value of 18.8 mL three times, his measurements are very precise but not accurate

Suppose another student gets the following titre values 19.9 mL . 20.1 mL and 19.8 mL. These measurements are accurate because they are all close to the standard value but not precise because there is no reproducibility.

As can be seen from these examples a measurement can be precise but not accurate, and accurate but not precise

In the given example accuracy is preferred over precision because the measurements are close to the standard value and hence the percentage of error is less.

A measurement can also be NEITHER accurate nor precise

Example: 18.2mL. 18.4 mL and 18.6 mL

A measurement can also be BOTH accurate and precise

Example: 19.9 mL, 19.9 mL, 19.9 mL

A VALID MEASUREMENT SHOULD BE BOTH ACCURATE AND PRECISE

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