a moles of particles of a identify the type of iron filings (1 g, not rusted), lead nitrate has substance in a given mass particles in each propanone. reacted with all the of that substance and vice substance. Students need access to an potassium iodide so versa electronic balance. there will be no b particles of a substance Optional: access to a warm further increase in 2) Have small, sealed in a given number of oven the amount of jars containing 1 mole moles of that substance precipitate formed. of particles of and vice versa Find the tube where different substances c particles of a substance the maximum e.g. 18g of water, 12g in a given mass of that amount of precipitate of carbon, 32g of substance and vice versa first forms. This tube sulfur, 56g of iron. had 4.0 cm3 Ask the students what potassium iodide they have in common. solution and 2.0 cm3 Explain that taking the lead nitrate solution relative atomic mass so the number of or relative formula moles of potassium mass in grams gives iodide is twice the us the mass of 1 mole number of moles of of that substance and lead nitrate and the they each contain the balanced equation is same number of Pb(NO3)2(aq) + particles called the 2KI(aq) PbI2(s) + → Avogadro constant. 2KNO3(aq) Write on the board 602 000 000 000 000 Equipment: 2 000 000 000, then burettes or convert it to standard graduated pipettes, 8 form: 6.02 x 1023. test tubes in a rack, bungs to fit the test tubes, ruler, lead nitrate solution (25
a moles of particles of a substance in a given mass of that substance and vice versa b particles of a substance in a given number of moles of that substance and vice versa c particles of a substance in a given mass of that substance and vice versa identify the type of particles in each substance. 2) Have small, sealed jars containing 1 mole of particles of different substances e.g. 18g of water, 12g of carbon, 32g of sulfur, 56g of iron. Ask the students what they have in common. Explain that taking the relative atomic mass or relative formula mass in grams gives us the mass of 1 mole of that substance and they each contain the same number of particles called the Avogadro constant. Write on the board 602 000 000 000 000 000 000 000, then convert it to standard form: 6.02 x 1023. iron filings (1 g, not rusted), propanone. Students need access to an electronic balance. Optional: access to a warm oven lead nitrate has reacted with all the potassium iodide so there will be no further increase in the amount of precipitate formed. Find the tube where the maximum amount of precipitate first forms. This tube had 4.0 cm3 potassium iodide solution and 2.0 cm3 lead nitrate solution so the number of moles of potassium iodide is twice the number of moles of lead nitrate and the balanced equation is Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Equipment: 2 burettes or graduated pipettes, 8 test tubes in a rack, bungs to fit the test tubes, ruler, lead nitrate solution (25
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