Question

a. instructor demonstration - density

• corn syrup
• water
• mineral oil
• glass marble
• rubber stopper
• ice
• cork

identify the liquids (l1, l2) and solids (s1,s2,s3,s4) in the tall glass cylinder.

Explanation:

Step1: Recall density - based layering

Denser substances sink, less - dense ones float. Corn syrup is denser than water, and water is denser than mineral oil.

Step2: Identify liquid L1

Since mineral oil is the least dense liquid among the three, L1 is mineral oil.

Step3: Identify liquid L2

Corn syrup is the densest liquid, so L2 is corn syrup.

Step4: Identify solid S1

Cork is the least dense solid among the given solids and will float on the least - dense liquid (mineral oil), so S1 is cork.

Step5: Identify solid S2

Ice has a density less than water but more than cork, so it will float on water but sink in mineral oil. Thus, S2 is ice.

Step6: Identify solid S3

The rubber stopper has a density greater than water and will sink in water, so S3 is the rubber stopper.

Step7: Identify solid S4

The glass marble is the densest solid among them and will sink to the bottom, so S4 is the glass marble.

Answer:

L1: mineral oil, L2: corn syrup, S1: cork, S2: ice, S3: rubber stopper, S4: glass marble