Chemical Reactions Observation

What is a chemical reaction?

• A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

• A chemical reaction is a biological process.

• A chemical reaction is a mathematical equation.

• A chemical reaction is a physical change in matter.

List three signs that indicate a chemical reaction is taking place.

• Change in volume

• Formation of bubbles

• Temperature change

• Gas production, formation of a precipitate, color change

Explain why it is important to observe chemical reactions.

• To ignore safety precautions

• It is important to observe chemical reactions to understand the changes in substances, identify reaction products, determine reaction mechanisms, and ensure safety.

• To speed up the reaction process

• To avoid understanding reaction mechanisms

How can you tell if a chemical reaction has occurred?

• Hearing a sound

• Smelling a new scent

• Seeing a shadow

• Observing a change in color, formation of a precipitate, evolution of gas, or change in temperature.

Give an example of a chemical reaction you have observed.

• Salt and water reaction

• Hydrogen peroxide and bleach reaction

• Vinegar and baking soda reaction

• Lemon juice and sugar reaction