Question

q4. which object would most likely float in water? a. a steel nail b. a plastic bottle cap c. a marble d. a coin q5. if two liquids do not mix and one floats on top of the top liquid? a. it is less dense than the bottom liquid b. it is denser than the bottom liquid c. both have the same density d. density cannot be compared

Explanation:

Q4

To determine which object floats in water, we use the concept of density. An object floats if its density is less than water's density (1 g/cm³). A steel nail (A), marble (C), and coin (D) are made of materials (metal, glass) with higher density than water, so they sink. A plastic bottle cap (B) is made of plastic, which has a lower density than water, so it floats.

When two immiscible liquids are together, the liquid that floats on top has a lower density than the liquid below. This is because density determines buoyancy in immiscible liquids—less dense liquids stay above denser ones. So the top liquid is less dense than the bottom liquid.

Answer:

B. A plastic bottle cap

Q5