Scientific method and experimentation quiz Lutzkanin September 2015

Place the following stages of a scientific method in order Run experiments Identify the problem Make conclusions Gather information Make a hypothesis Analyze the data Answer 1. Identify the problem 2. Gather information 3. Make a hypothesis 4. Run experiments 5. Analyze the data 6. Gather conclusions

A statement about what is happens in nature that is true all the time. Answer: Scientific Law

An aspect of an experiment that can be changed Answer: Variable

An inference about a future event based on current evidence or past experience. Answer: Prediction

Answer: Scientific Theory An explanation of things or events based on knowledge gained from many observations and investigations. Answer: Scientific Theory

This occurs in an experiments when what the scientist expects changes of how the results are viewed Answer: Bias

Write the 5 parts of a system then show using the 5 parts how an alarm clock is a system. Goal – wake you up on time Input – set the alarm time Process – keeps the time Output – alarm goes off Feedback – n/a

Write the 5 parts of a system then show using the 5 parts how a Refrigerator is a system. Goal – keep food cold Input – put food in Process – food, kept cold Output – food is cold Feedback – thermostat

In 1928, Sir Alexander Fleming was studying bacteria grown in culture dishes. He noticed a mold called penicillin was also growing in some of the dishes. A clear zone existed around the penicillin mold. All the bacteria that had grown in this clear zone had died. In the culture dishes without mold, no clear areas were present. Fleming decided that the mold must be producing a chemical that killed the bacteria. He decided to isolate this substance and then test it to see if it would kill bacteria. Fleming prepared two beakers of nutrient broth, with had everything that the mold needs to grow and reproduce. He put mold into one of the beakers of nutrient broth. He allowed the mold to grow, and then removed the mold from the nutrient broth, and then he added the broth to a dish of bacteria. Fleming added the nutrient broth that had not had mold growing in it to another dish of bacteria. The bacteria in the dish with nutrient broth that had mold in it were all killed. The bacteria in the dish with nutrient broth that did not have mold in it were not killed. Fleming concluded that the mold produced a bacteria killing substance in the broth. He called the substance penicillin 1. Identify the problem Fleming wanted to solve. 2. What was Fleming’s hypothesis? 3. What was the variable of the experiment? 4. What was the control? 5. What was Fleming’s conclusion? 6. What was the great discovery from Fleming’s experiment?

1. Identify the problem Fleming wanted to solve. Was the mold killing the bacteria 2. What was Fleming’s hypothesis? The penicillin mold killed the bacteria 3. What was the variable of the experiment? mold 4. What was the control? Dish of bacteria with nutrient broth 5. What was Fleming’s conclusion? The mold produced a bacteria-killing substance 6. What was the great discovery from Fleming’s experiment? penicillin