Cambridge Secondary (7-9). Stage 7. MCE Science. Workbook - Unit 9: Chemical Reactions - Question 14

Wear eye protection and disposable gloves when handling solutions. Work under teacher supervision. Investigation 2: put a sheet of paper towel on the balance, and on top of that, put a small beaker and an empty dropper pipette. Zero (tare) the balance, then pour about 10 cm³ of sodium chloride solution into the beaker. Place the beaker back on the balance. Half-fill the dropper pipette with silver nitrate solution and lay it carefully back on the balance. Add the silver nitrate solution to the sodium chloride solution, then put the empty dropper back on the balance.

Compare the final mass to the total mass of the reactants. What do you notice about the two masses?



Labels: paper towel; silver nitrate solution; sodium chloride solution.