Ex. Acid corrosion

Activity:

• 1. Write the title "Acid Corrosion" in your exercise book.

  2. Make a copy of the table in your exercise book and fill in the gaps by calculating the missing results.

1. Plot a graph of overall mass lost against time. (Need help, click here)

2. When was the mass being lost fastest? __________________________________________________

3. Use your graph to estimate how much mass had been lost after 30 seconds. ____________________

4. Either use dictionary or search for "define: corrosion" on the internet. Write the definition in your exercise book.

5. How can you tell that no more corrosion took place after 12 minutes? __________________________

6. _________________________________________________________________________________

   1. Carl said that this experiment proved that the acid in the fizzy drink had corroded the limestone.

   2. Emma said that she didn’t think that this was a fair test, as fizzy drinks go flat if you leave them to stand and you might have got these results anyway without adding the limestone.

7. Apart from the change in mass, what could you see that would support Carl’s conclusion?

• 1. _________________________________________________________________________________

  2. Do you agree with Emma’s evaluation? How could you improve the experiment and get extra evidence to check on Emma’s idea?

  3. _________________________________________________________________________________

  4. _________________________________________________________________________________