Week 1 Midweek Assignment: Scientific Method Developing Hypotheses and Performing Experiments
Week 1 Midweek Assignment: Scientific Method
Developing Hypotheses and Performing Experiments
Materials
• Ice cube tray or 5 containers or cups for freezing liquids
• Timer
• 5 of any of the following liquids: tap water, salt water, sparkling water (without sugar), cola, rubbing alcohol, soap (hand or dish), juice, milk, syrup, cooking oil
• Freezer
• 5 plates, cups, or bowls
• Camera (can use webcam, smartphone, etc)
Procedure
1. To make salt water, dissolve 1 teaspoon of salt into 1/8 cup of water. (You may have to heat the water to get the salt to fully dissolve).
2. Add each of the liquids listed above in the materials list to an ice cube tray or five containers. You only need one cube for each liquid. There should be the same amount of liquid in each cube or container.
3. Once you have filled the ice tray or containers, place them into the freezer.
4. Complete your hypothesis on the next page.
5. Each liquid needs to be completely frozen before you perform the next steps.
6. Empty your frozen cubes into your designated plates, cups, or bowls. Each cube should be in a different container.
7. Get a piece of paper and write your name and UAG student ID on it. Place the paper next to the cubes. Then take a picture of the frozen cubes with the paper clearly showing.
8. Start your timer and determine how long it takes for each of your cubes to melt.
9. Complete the Data Table below, insert or paste the picture you took of the frozen cubes, and answer the questions.
10. Then save the document and submit it.
Hypothesis
Which substance do you think will melt the fastest? Why?
Which substance do you think will take the longest to melt? Why?
Data Table
Liquid Tested Time to Melt (Provide unit of time here or in table) Order of Melting (with fastest ranked 1)
Evidence
Insert the picture you took of your frozen cubes. Make sure the picture includes a piece of paper with your name and UAG student number.
Conclusions (Write in complete sentences.)
1. Were your hypotheses correct? Explain.
2. Were there any results that surprised you? Why or why not?
3. What would you need to do to determine if your results are reliable? Explain.
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