In order to calculate for the number of moles of these substances, we have to know what are chemical formulas of these and their molar masses. They are as follows:
sand = SiO2 (60.08 g/mol)
chalk = CaCO3 (100.0869 g/mol)
sugar = C12H22O11 (342.2965 g/mol)
The commonly used conversion would be that 1 teaspoon is equal to approximately 5 grams. We calculate as follows:
sand = 5 / (60.08 g/mol) = 0.08 mol
chalk =5 / (100.0869 g/mol) = 0.05 mol
sugar = 5 / (342.2965 g/mol) = 0.01 mol