Scientific Method Review

Think about the soda experiment…

1. Question: __________________________2. Collecting Information: _______________3. Hypothesis: __________________________4. Experiment: __________________________5. Observe and Record: _________________6. Conclusion: __________________________

Think about the soda experiment…

1. Question: What happens when you put regular and diet in water?

2. Collecting Information: looking at the cans and comparing nutrition facts

3. Hypothesis: I think both the cans will sink.4. Experiment: 1. fill bucket with water. 2. put

cans in water. 3. observe 5. Observe and Record: Diet floats. Regular

sinks.6. Conclusion: My hypothesis was partially

correct. The regular did sink like I thought, but the diet floated.

List the procedure…

• In the colors in sunlight lab.1. Pour milk into the pie tin.2. Place three drops of each food

coloring in the milk.3. Pour the dish soap down the

side of the pie tin.

What were the materials….

• In the “Clay Boat Activity”–Water– Tub– Clay– Pennies

What was the variable…

• In the “Drops on Penny Lab?”– The type of liquid (alcohol vs. water)

What makes up a conclusion?

• Was your hypothesis correct?• What were your results?

What is the first step of the scientific method?

• Ask a questionor

• State a problemor

• State a purpose

Read and Answer

A pet store owner wants to know if feeding his hamster vitamins will make them bigger. He feeds a cage of twenty hamsters vitamins. Another cage of twenty hamsters does not get vitamins. They are given the same about of exercise, food and water.

1. In this example the vitamins is the _________.

2. The exercise, food and water are the _____.

Read and AnswerA pet store owner wants to know if feeding his hamster vitamins will make them bigger. He feeds a cage of twenty hamsters vitamins. Another cage of twenty hamsters does not get vitamins. They are given the same about of exercise, food and water.

1. In this example the vitamins is the variable.

because it is the only difference between the two cages. It is what is being tested.

2. The exercise, food and water are the controls.

these remain the same for all hamsters. They are used for comparison.

How can you collect background information?

• BEFORE a hypothesis!

How can you collect background information?

• BEFORE a hypothesis!– Read books–Make observations (using senses)– Ask questions

Period 1 Only:Identify the problem, hypothesis, how the hypothesis was tested, and so on.

Let me know at the beginning of class if you have any questions.

• The Discovery of Penicillin• In 1928, Sir Alexander Fleming was studying Staphylococcus

bacteria growing in culture dishes. He noticed that a mold called Penicillium was also growing in some of the dishes. A clear area existed around the mold because all the bacteria that had grown in this area had died. In the culture dishes without the mold, no clear areas were present.

• Fleming hypothesized that the mold must be producing a chemical that killed the bacteria. He decided to isolate this substance and test it to see if it would kill bacteria. Fleming transferred the mold to a nutrient broth solution. This solution contained all the materials the mold needed to grow. After the mold grew, he removed it from the nutrient broth. Fleming then added the nutrient broth in which the mold had grown to a culture of bacteria. He observed that the bacteria died.