Friday, March 15, 2013

Our Science Project for the 2013 science night at our school!

Our science project was a big hit on Science Night!  Here's the text of our display: 

The Penny Experiment
  
Observations:
“I observed that pennies get dirty and sticky.”
       --RJH and VG

“Dirty pennies may confuse the cashier.”
       --OJ

“When they get stuck in my backpack they get smelly.”
       --SG

“I observed that if pennies get left in the dark they get dirty or rusty.”
       --MM

Questions:  What will happen if we place a penny in different liquid solutions:  water, salt water, carbonated water, lemon juice, vinegar, or vinegar with salt?  Which solution would best clean a penny?

Hypotheses:  
“I think some liquids would be different than other liquids.  I think vinegar would make it dirty.”
                                         --MQ

“I think that certain liquids will change the pennies differently.  I think the water will make it shiny.”
                                         --OJ

“I think that certain liquids will change the penny differently.” 
                                         --JW

“When I put the penny in the lemon juice, I think the lemon juice will make the penny dirty.”
                                         --MM

“I think when I put the vinegar and salt together, it will explode.”
                                         --HC & ZL

“I think when I put the penny in the water it will rust.”
                                         --AO

“I think that certain liquids will change the penny differently.  I think that the liquids have different minerals in them.”
                                         --RJH

“I think the acid will explode.”
                                         --OS

“I think that when H puts the salt into the vinegar, it will make the whole school explode.”
                                         --BA

“I think the lemon juice won’t clean the pennies.”
                                         --MP

 Experimental Procedure:
“We researched items that could clean pennies such as Pelligrino bubbly water, lemon juice, vinegar, salt water, plain water, or vinegar and salt (HCl).”
       --R and IEH

“We put pennies in test tubes with solutions and observed what happened.”
       --OS and TO

“We put pennies in test tubes.”
       --BW


Materials:
·     Test tubes or clear cups
·     Pennies
·     Tap water
·     Carbonated (“bubby”) water
·     Vinegar
·     Salt
·     Lemon juice
·     Eye droppers



 Conclusions:
“To me the plain water didn’t do anything.  HCl made the penny really shiny like a new penny.”
              --MM

“Salt water cleaned the penny a little.”
              --MC

“Vinegar – made the penny shiny.”
              --MP

“Lemon juice made penny shiny.”
              --KC

“Penny in HCl – it made pennies shiniest.  Penny in bubbly water – made penny darker.”
              --ZM

“I thought the water and salt wouldn’t stick to the penny – it did.” 
              --MQ

“For my penny, the vinegar got it shiny and clean.  The water got the penny rusty.”
              --LR

“A penny in water made the dirt come off.”
              --JT

“Penny in water – cleaned off dirt.”
--AB

“A penny in bubbly water dyed the penny black.”
              --BA

“Penny in Pellegrino made penny darker.
              --AO and AM

“Penny in bubbly water – made penny darker.”
              --SCi

“Penny in water – cleaned off dirt.”
              --OJ

“Salt water – made penny clearer.”
              --HC


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