How to clean coins with vinegar

The video tutorial demonstrates an experiment to determine which solution, lime juice or vinegar, cleans pennies more effectively. A control penny is left in the air. After two days, the results are observed and discussed, with vinegar and lemon juice being compared for effectiveness. The experiment highlights the importance of controls and comparative analysis in scientific experiments.

What is the purpose of leaving one penny in the air during the experiment?

• To dry the penny before cleaning

• To test the effect of sunlight on pennies

• To have a control for comparison

• To see if air cleans pennies better than liquids

How long were the pennies left in the liquids during the experiment?

• One day

• Four days

• Two days

• Three days

Which liquid was found to clean the pennies the best?

• Vinegar

• Lemon juice

• Lime juice

• Water

What was the main observation about the penny left in the air?

• It was dirtier than the others

• It was the cleanest

• It dissolved

• It changed color

Which of the following was not used in the experiment?

• Lime juice

• Salt water

• Vinegar

• Lemon juice