Chemical Reactions

Front

What is a chemical reaction?

Back

A process where substances (reactants) undergo a transformation to form new substances (products) with different properties.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What happens to atoms during a chemical reaction?

Back

Atoms get rearranged to form new substances.

Front

What is a mixture?

Back

A combination of two or more substances where their atoms are not chemically bonded.

Front

What are the signs of a chemical change?

Back

Production of gas, unexpected color change, formation of a precipitate, and production of heat or light.

Front

What is a precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it remains constant.

Front

What is an example of a physical change?

Back

Cutting a sandwich into smaller pieces.

Front

What is an example of a chemical change?

Back

Burning wood, which produces ash, smoke, and gases.

Front

What is a solution?

Back

A homogeneous mixture where one substance (solute) is dissolved in another (solvent).