Customizable Design of Experiments Project Ideas for High School: Moldy Bread
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Guia de Design Experimental Para Estudantes e Educadores
Por Oliver Smith
Ensinar design experimental e deixar os alunos desenvolverem suas próprias perguntas e hipóteses leva tempo. Esses materiais foram criados para dar suporte e estruturar o processo para permitir que os professores se concentrem em melhorar as ideias-chave no design experimental.
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Storyboard Descrição
Experimental Design - completed planning worksheet
Texto do Storyboard
- Deslizar: 1
- Question - What do you want to find out?
- How does temperature affect mold growth on bread?
- Explanation of Hypothesis
- Mold is a living organism. The chemical reactions that keep the mold alive are affected by temperature. When we increase the temperature, the speed of these chemical reactions increases. Therefore, if we increase the temperature, more mold should grow on the bread.
- Deslizar: 3
- Hypothesis
- If I increase the temperature, then mold will grow more quickly on the bread.
- Prediction
- The piece of bread kept in the warmest location will have the most mold growth.
- Deslizar: 4
- Independent Variable
- The temperature of storage space
- What is your range? How many times will you repeat the test?
- There will be 2 different temperatures: Refrigerator temperature 40°F (4°C)Room temperature 73°F (23°C).I will repeat the experiment 3 times at each temperature.
- Deslizar: 5
- Dependent Variable
- The amount of mold on the bread
- How will you measure your dependent variable?
- Using a transparent grid I will calculate the area of the bread which is covered in mold.
- Deslizar: 6
- Controlled Variables
- 1. Amount of light2. Exposure to air3. Type of bread4. Size of bread slice
- How will you keep them constant?
- 1. All the bread slices will be put in paper bags so they are all in the dark.2. All the bread slices will be put in plastic bags.3. All the bread slices will be taken from the same loaf.4. Bread slices will be chosen that are the same size.
- Deslizar: 7
- Risk asssessment
- You could have an allergic reaction to mold.You could inhale the mold.
- How can these risks be managed?
- If you are allergic to mold don't take part in the experiment.Do not open the bags at the end of the experiment and dispose of them carefully.
- Deslizar: 9
- Diagram
- Deslizar: 10
- Materials - What do you need to complete this experiment? Why?
- • 6 slices of bread that are the same size• A refrigerator - kept at a constant temperature• A warm place - kept at a constant temperature• 6 plastic bags - to keep the bread in and stop the mold getting out• 6 paper bags - to keep the sunlight out• A ruler - to measure the mold spots• A transparent grid - to help work out the area of bread that is covered in mold• A marker - to label the bags
- Deslizar: 11
- Plan - How are you going to carry it out safely?
- Deslizar: 12
- 1. Use the marker pen to label the 6 bags so they can be identified easily later. Place a slice of bread in each bag.2. Put the bags inside paper bags and put 3 into the fridge and 3 in a closet.3. Leave the bags for 2 days.4. Check the bags every day and record how much of the surface area is covered in mold. This can be done using a transparent grid.5. Record your results in a table.6. Do not open the bags and dispose of them carefully into the trash.
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