Endothermic and Exothermic Changes| Energy Changes| Introduction [Online Video]

Basics

Energy cannot be created or destroyed. However, it can be changed from one form to another. All chemical reactions involve energy changes. Some physical changes also involve energy changes.

Focus

In this video, we will give an introduction on exothermic and endothermic changes.

Endothermic Change

When an endothermic change occurs, heat energy is taken in by the particles from the surroundings. The final substance/product has higher energy than energy of initial substance/reactant.

Physical Process: Evaporation, Melting, Boiling, Dissolving some ionic compounds

Chemical Reaction: Photosynthesis, Thermal Decomposition

Exothermic Change

When an exothermic change occurs, heat energy is given out by the particles to the surroundings. The final substance/product has lower energy than energy of initial substance/reactant.

Physical Process: Condensation, Freezing, Dissolving anhydrous salts in water, Dissolving acids in water

Chemical Reaction: Combustion, Respiration, Neutralisation, Corrosion of metals

Topic: Energy Changes, O Level Chemistry, Singapore

Please SUBSCRIBE to my channel and SHARE this video with your friends if you find it helpful!

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s