Glow Stick Experiment Goals Determine and understand the

Goals �Determine and understand the types of energy in this system. �Follow the scientific

Energy �Energy can never be ______ or ______ �Energy changes from one form to

Before the Experiment �What type of energy in an unbroken glow stick? 1. 2.

Hypothesis What do you think will happen? �In what condition will the light will

Methods 1. Break the glow sticks 2. Shake the glow sticks 3. Stick one

Data Glow Stick Ice Water Room Temperature Hot Water Observations: What Do You See?

Results: After the Experiment �What type of energy in a glowing glow stick? 1.

Results: After the Experiment �What type of energy is shown in the different water

Class Demonstration �Is the glow stick liquid in the ice water still glowing? �Is

Theory �The chemicals reacted formed new chemicals. �These chemicals do not need as much

Theory �When you put the glow stick in cold water, the cold water absorbed

Theory �When placed in hot water, the chemicals in the glow stick absorbed thermal

Conclusions 1. Describe how the energy changes types? �Hint: Chemical, Thermal and Radiant Energy

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Glow Stick Experiment!

Goals �Determine and understand the types of energy in this system. �Follow the scientific method. �Determine under which conditions that glow stick is brighter, lasts the longest and why.

Energy �Energy can never be ______ or ______ �Energy changes from one form to another! 1. Gravitational potential 2. Elastic 3. Chemical potential 4. Radiant 5. Thermal 6. Kinetic (motion) 7. Sound

What’s In a glow stick?

Before the Experiment �What type of energy in an unbroken glow stick? 1. 2. 3. 4. 5. 6. 7. Gravitational potential Elastic Chemical potential Radiant Thermal Kinetic (motion) Sound

Hypothesis What do you think will happen? �In what condition will the light will be the brightest or dimmest? �In what condition will the light last the longest?

Methods 1. Break the glow sticks 2. Shake the glow sticks 3. Stick one each of the different water temperature � Ice water � Room-temperature water � Hot water 4. Wait 1 -2 minutes and record what you see in the table!

Data Glow Stick Ice Water Room Temperature Hot Water Observations: What Do You See? Brightness Rank (1 -3)***

Results: After the Experiment �What type of energy in a glowing glow stick? 1. 2. 3. 4. 5. 6. 7. Gravitational potential Elastic Chemical potential Radiant Thermal Kinetic (motion) Sound

Results: After the Experiment �What type of energy is shown in the different water temperatures? 1. 2. 3. 4. 5. 6. 7. Gravitational potential Elastic Chemical potential Radiant Thermal Kinetic (motion) Sound

Class Demonstration �Is the glow stick liquid in the ice water still glowing? �Is the glow stick liquid in the hot water still glowing?

Theory �The chemicals reacted formed new chemicals. �These chemicals do not need as much energy to hold their molecules together, so they release that extra energy as light.

Forming new chemicals and new bonds!

Theory �When you put the glow stick in cold water, the cold water absorbed some of thermal energy from the glow stick, so the reaction slowed down and the glow stick wasn’t as bright. Heat

Theory �When placed in hot water, the chemicals in the glow stick absorbed thermal energy from the hot water. The added energy made the chemicals react faster and produce more light. Heat

Conclusions 1. Describe how the energy changes types? �Hint: Chemical, Thermal and Radiant Energy 2. In the experiment that you performed, how does temperature affect the brightness at the beginning? �Sentence starter: As the temperature increases, the brightness… 3. In our class model system, how does temperature affect brightness after a long time? �Sentence starter: As the temperature increases, the brightness… 4. Why does a reaction happen faster? �Hint: Remember C-D-D and W-E-E?