Question

part iii- true or false
____7. in the density column to the right, oil has the highest density.
_____8. a precipitate is formed when two liquids form a solid after reacting.
_____9. rusting on iron nails is an example of a physical change.
_____10. fizzing during an experiment is an example of a chemical change.
confidence scale: not at all confident, slightly confident, somewhat confident, quite confident, extremely confident with corresponding emojis
density column diagram: cylinder with layers labeled vegetable oil, water, liquid soap, honey

Explanation:

Question 7

In a density column, substances with lower density float on top. Oil (vegetable oil here) is at the top, meaning it has the lowest density, not the highest. So the statement is false.

A precipitate is defined as a solid formed from a reaction between two solutions (liquids in a sense, as solutions are liquid mixtures) that is insoluble and separates out. So when two liquids (solutions) react to form a solid, that solid is a precipitate. The statement is true.

Rusting of iron nails involves iron reacting with oxygen and water to form iron oxide (rust), which is a new substance. This is a chemical change, not a physical change (physical changes don't form new substances). So the statement is false.

Answer:

False

Question 8