Calculate the number of atoms needed to balance the following equation: caco3+hcl-> co2+h2o+cacl. (number 3 on my paper)

Write a hypothesis that answers the lesson question, “while observing a chemical reaction, how can you tell which reactant is limiting? ” hypothesis: if a substance is the limiting reactant, then . . because . .

Amedication is given at a dosage of 3.000 mg of medication per kg of body weight. if 0.1500 g of medication is given, then what was the patient's weight in pounds (lbs)? there are 453.59g in 1 lb.

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold