Which of the following describes a precipitate?
Group of answer choices
a gas forms when a solid is placed in a liquid
bubbles form when an acid is poured on a rock
a liquid forms when a block of metal is heated
a solid forms when one liquid is mixed into another
Answer (2)
Answer:what happen s when you quickly flicked thae paper?explain
A solid forms when one liquid is mixed into another.A precipitate is a solid that forms when two liquids react and create an insoluble substance. This happens in a chemical reaction where the new substance does not dissolve in the liquid and instead settles out as a solid.The other answer choices describe gas formation (bubbles) or phase changes (melting), which are not examples of precipitation.Precipitation is different from other changes, such as gas formation or phase changes. For example, when bubbles form in a liquid, it usually indicates the production of a gas, not a solid. Similarly, when a metal block is heated and turns into a liquid, it is just melting, which is a physical change, not a chemical one. In contrast, precipitation results in a brand-new substance that was not present before. This is why a solid forming from two mixed liquids is the correct description of a precipitate.Examples: Silver nitrate (AgNO₃) + Salt water (NaCl) → Forms a white solid called silver chloride (AgCl).Barium chloride (BaCl₂) + Sulfuric acid (H₂SO₄) → Creates a white solid called barium sulfate (BaSO₄).Lead(II) nitrate (Pb(NO₃)₂) + Potassium iodide (KI) → Produces a bright yellow solid called lead(II) iodide (PbI₂).In all these cases, two liquids mix, and an insoluble solid (precipitate) forms, proving a chemical reaction has taken place.
