Chemical reactions: precipitation

What is a precipitate? Tick 1 correct answer

• A substance that dissolves in water.

• A gas produced in a chemical reaction.

• A liquid that evaporates quickly.

• An insoluble solid formed when two solutions react together.

Why are precipitation reactions used in qualitative analysis?

• To measure the quantity of a substance.

• To confirm the presence of a substance.

• To increase the temperature of a solution.

• To dissolve solids in a solution.

A substance that will not dissolve in a particular solvent is described as _________________.

• insoluble

• soluble

• miscible

• volatile

Which term describes a chemical test that confirms the presence of a substance without measuring its quantity?

• Quantitative analysis

• Spectroscopic analysis

• Qualitative analysis

• Precipitation analysis

An ________________ solution is formed when a substance is dissolved in water. Fill in the blank

• aqueous

• solid

• gaseous

• colloidal

A precipitate is an insoluble ________________ in a solution. Fill in the blank

• solid

• liquid

• gas

• solute

What is a precipitation reaction in chemistry?

• A reaction where soluble solutions form an insoluble product

• A reaction where gases are formed from liquids

• A reaction where solids dissolve into liquids

• A reaction where liquids evaporate into gases

Which of the following is an indicator of a precipitation reaction?

• The solution becomes clear

• The solution changes color

• A solid or cloudy substance appears

• The solution heats up

What type of reaction involves the exchange of ions to form new compounds?

• Single displacement reaction

• Double displacement reaction

• Combustion reaction

• Synthesis reaction

How does temperature affect precipitation reactions?

• Higher temperatures always promote precipitation

• Lower temperatures can promote precipitation

• Temperature has no effect on precipitation

• Higher temperatures decrease solubility, promoting precipitation