3. pour the 5 g of glucose into the 50 ml of water\n4. stir the contents of the beaker using a glass rod\n5…

3. pour the 5 g of glucose into the 50 ml of water\n4. stir the contents of the beaker using a glass rod\n5. using tweezers, count out 15 pieces of iron (fe) filings\n6. add the iron filings to the beaker\n7. stir the contents of the beaker using a glass rod\nduring which step(s) was the student handling a pure substance?\na step 4 only\nb steps 1, 2, and 5\nc steps 1 and 3\nd steps 6 and 7

3. pour the 5 g of glucose into the 50 ml of water\n4. stir the contents of the beaker using a glass rod\n5. using tweezers, count out 15 pieces of iron (fe) filings\n6. add the iron filings to the beaker\n7. stir the contents of the beaker using a glass rod\nduring which step(s) was the student handling a pure substance?\na step 4 only\nb steps 1, 2, and 5\nc steps 1 and 3\nd steps 6 and 7

Answer

Brief Explanations:

A pure substance has a definite and constant composition. Glucose is a pure compound and iron filings are a pure element. In step 3, 5 g of glucose (a pure substance) is being poured into water. In step 5, 15 pieces of iron (Fe) filings (a pure substance) are being counted out.

Answer:

B. Steps 1, 2, and 5