The result will usually be that the vinegar cleans the pennies better, demonstrating that a lower-pH solution is better at cleaning discoloration due to oxidation. The volume of liquid and the material of the penny are both controlled variables in this experiment. This experiment is especially good for teaching the concept of a controlled variable if you include a third variable -- how dirty the pennies are.
1 doctor agreed: Yes: Pinworm symptoms can include gastrointestinal upset, anal or vaginal itchiness, loss of appetite, difficulty sleeping, irritability, restlessness. Untreated pinworm infection can lead to weight loss, diarrhea, genital rash, urinary incontinence and vaginal discharge.
indigestion the stomach flu and food poisoning are common causes of acute diarrhea and abdominal pain in these cases symptoms last for less than four days and often resolve without medical treatment bacterial infections viral infections and certain parasites also cause these symptomsorgans in the abdomen include the intestines the kidneys the appendix the spleen the stomach the gallbladder and the liver infections or diseases that affect these organs can cause pain with diarrhearequent constant or severe abdominal pain and diarrhea may indicate a disease or a more serious medical issue common causes of abdominal pain and diarrhea include viral gastroenteritis stomach flu bacterial gastroenteritis food poisoning food allergies pms lactose intolerance