Environmental science

Laboratory

Before beginning this Lab, read “Lab 1: Introduction to Science” in your Environmental Science Student Manual. This lab includes a video containing several questions and critical thinking activities that focus on the scientific method, lab reporting, and data collection and management. As you view the video, you will be prompted to stop and answer the Exercise 1 questions on the Week One Lab Reporting Form Preview the document View in a new window. Make sure to complete all of the following items before submission:

· Read through the introductory material.

View the Lab 1 videos and answer Exercise 1 Questions 1 through 10 in complete sentences on the Week One Lab Reporting Form Preview the document View in a new window. Video 1: The Scientific Method
Shared by: Annie Woodle|Length: 01:35

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· Video 1 (Links to an external site.)Links to an external site.

· Video 2 (Links to an external site.)Links to an external site.

· Video 3 (Links to an external site.)Links to an external site.

· Video 4 (Links to an external site.)Links to an external site.

Submit the Lab One Reporting Form via Waypoint. The document does not need to include a title page or other APA formatting; however, any outside sources utilized in your answers must be referenced in proper APA format as outlined in the Ashford Writing Center.

Lab 1 – Introduction to Science

Exercise 1: The Scientific Method

In this exercise, you will answer the questions based on what you have seen in the videos throughout the lab. Be sure to pay careful attention to the videos – you will not only need them to complete this exercise successfully, but also to have a firm understanding of the scientific method for future labs.

QUESTIONS

Make an observation – Write down any observations you have made regarding the effect of pollution on the environment.

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Do background research – Utilizing the scholarly source (provided here), describe how pollution might affect yeast.

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Construct a hypothesis – Based on your research from question 2, develop an if-then hypothesis relating to the effect of pollution on yeast respiration.

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Test with an experiment – Identify the dependent variable, independent variable, and the controlled variables for the experiment.

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Analyze results – Record your observations of the three test tubes before incubation and compare them to the observations provided in the video.

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Test Tube

Initial Appearance

Yeast with No Pollutant

Yeast with Salt Water

Yeast with Detergent

Analyze results – Record your observations of the three test tubes after incubation.

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Test Tube

Final Appearance

Yeast with No Pollutant

Yeast with Salt Water

Yeast with Detergent

Analyze results – The table below shows sample data regarding the amount of carbon dioxide produced by each tube. Determine what type of graph would be the most appropriate for displaying the data and explain why you chose that graph. Then, make a graph. Use Microsoft Excel or a free graphing program (for example, https://nces.ed.gov/nceskids/createagraph/) to create the graph. Submit this with your post-lab questions.

Sample

Amount CO2 Produced (mL) After 1 Hour

Yeast with No Pollutant

7 mL

Yeast with Salt Water

0.5 mL

Yeast with Detergent

0 mL

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Draw conclusions – Interpret the data from the graph in Question 7. What conclusions can you make based on this graph?

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Draw conclusions – Based on your observations and your graph, would you reject or accept the hypothesis you made in Question 3? Why?

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Draw conclusions – Imagine you are an environmental scientist employed by a city. Some residents have expressed concerns regarding how salt is applied to roadways in the winter because of the harm it may cause aquatic life in area streams. Propose an experiment using yeast to determine if salt pollution runoff is a potential concern in your community.

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References

Any sources utilized should be listed here.

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