rusty nails

Rusty nails

By: Alie Saenz

Conclusion

My hypothesis was supported because the nails that were in the water rusted faster than the nails that were in the Coke and Pepsi.

Data/Results

Nails

• Day 1) - Water: nail under water is a more lighter gray than nail above water

Pepsi- White rim around edge of nail

Coke- Light gray color

• Day 2) - Water: Orange substance covering most of nail

Pepsi- White rim now around edge of nail now orange

Coke- Orange rim around edge of nail

• Day 3) - Water: Orange substance around entire nail

Pepsi- Black bits surrounding most of nail

Coke- Black bits surrounding lower section of nail

Procedure

So, I took out 6 glasses, filled 2 with water up to 5 cm and out the nails in so a little bit was sticking out at the top. Next, I filled 2 more glasses up with Pepsi and did the same thing with the nails as the water. Then I filled 2 more up with Coca-Cola

and did the same thing with the nails as the Pepsi and the water.

Groups and variables

Manipulated variable: type of soda

Responding variable: How fast the nail rusts

Control group: water

Experimental group: Coke and Pepsi

Hypothesis

If I put a nail in a glass of water, then it will rust faster than if I put it in a glass of Coca-Cola or Pepsi because of the oxygen level in water.

Problem or question

Does a nail rust faster in water, Pepsi, or Coke-Cola?