20090728140736 Lect 5_data Logging 3e Model

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UTILIZED SOFTWARE (‘DISCOVERY’) – USED TO READ INFORMATION FROM SENSORS

AN ELECTRONIC INSTRUMENT THAT RECORDS MEASUREMENTS OVER TIME. THE READINGS ARE THEN TRANSFERRED TO THE COMPUTER

TO CONVERT A PHYSICAL QUANTITY INTO AN ELECTRICAL SIGNAL. TYPES: LIGHT, TEMPERATURE, SOUND, pH HUMIDITY, PULSE, DISSOLVED2 OXYGEN ETC.

ENGAGE

I Can Freeze And Boil ! Do you think it’s FREEZING here? Can you see this phenomenon in Malaysia? Why?

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ENGAGE

I Can Freeze And Boil !

Is it FREEZING here or BOILING ? At what temperature does this process happen?

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EMPOWER

Planning and Doing Your Experiment Part 1: The freezing point of water

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EMPOWER Results

Part 1: The freezing point of water

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EMPOWER Results

Part 1: The freezing point of water

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EMPOWER Discussion

Part 1: The freezing point of water

Questions 1. What do you observe when the water freezes? 2. Look at your graph, what is the freezing point of water? 3. What happened to the water temperature during freezing? 4. How are the ‘concepts’ of melting point and freezing point related? 5. How are these two concepts different? 8

EMPOWER

Planning and Doing Your Experiment Part 2: The boiling point of water

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EMPOWER Result

Part 2: The boiling point of water

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EMPOWER Result

Part 2: The boiling point of water

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EMPOWER Discussion

Part 2: The boiling point of water

Questions 1. What do you observe when the water boils? 2.How long should you boil the water? 3.Why is the temperature keep on rising? 4.Look at your graph, what is the boiling point of water? 5.What is the physical form of water when it is boiling?

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ENHANCE

Pressure cooker reduce the cooking time and save nutrients. Explain. 13

ENGAGE

Its bigger but lighter !

What ingredients do you need to make a bun? What makes the dough expand and becomes bigger? Is there any gas released during the process? Does the dough becomes hotter? 14

EMPOWER

Planning And Doing Your Experiment End Product Of Fermentation

Sensors: pH & temperature

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EMPOWER

Planning And Doing Your Experiment End Product Of Fermentation

Data Logger Temperature

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EMPOWER Result

End Product Of Fermentation

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EMPOWER Result

End Product Of Fermentation

Temperature

pH

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EMPOWER Discussion

End Product Of Fermentation

Questions

1. Which graph is which? 2. What does the graph tell you about the change in 3. 4. 5. 6. 7.

pH during fermentation? Why does the pH change? What does the graph tell you about the change in carbon dioxide level during fermentation? Why does the carbon dioxide level change? How do the graphs change with respect to each other? Is there a pattern here? What is the end product of this experiment? 19 State the equation of yeast fermentation.

ENHANCE

End Product Of Fermentation

Discuss the importance of fermentation

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EXTENSION

End Product Of Fermentation

Find out the new technique in fermentation by using biotechnology in food industrial.

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ENGAGE

The Bouncing Sound You are moving into a new house. What will happen if you scream in the room of the house? Does the same phenomena happen if you scream in this room? Why? 22

EMPOWER

Planning And Doing Your Experiment The Reflection and Absorption of Sound

Insert the sound sensor here Ticking alarm clock 23

EMPOWER

Planning And Doing Your Experiment The Reflection and Absorption of Sound

Wood

Glass

Sponge

Metal

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EMPOWER Discussion

The Reflection and Absorption of Sound

Questions 1. Study the results that you obtained. a. What type of surfaces is good reflector of sound? b. What type of surfaces is good absorber of sound? 2. You can hear the ticking sound of the clock at the other end of the tube. Why does this happen?

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ENHANCE

The echoes in the studio can be reduced because the sound is absorbed by soft and rough surfaces. Name the objects in this studio that can absorb the sound.

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EXTENSION The Bouncing Sound

Bats produce high-pitched beeps or clicks and listen for the echoes of these sounds as they are reflected off by objects. How can bat measure the distance of and object? Plan and carry out and experiment to find out. Students may use different distances of tube containing the sound source (use varies distance of tube A) and record

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