Chemical reactions with metals may create some interesting results such as precipitate. what is precipitate? a- a solid that forms when two liquids are mixed b- a solid that forms when two gases are mixed c- a gas that forms when two liquids are mixed d- a liquid that forms when two solids are mixed

The appropriate answer is a. A solid that forms when two liquids are mixed. Another definition for precipitate is an insoluble solid that emerges in a liquid solution or reaction between two liquids. The precipitate is often in suspension. The process by which a precipitate forms in a solution is called precipitation.   

The answer is frictional force