What are the properties of substances?
The properties of substances can be either physical or chemical.
- Physical properties are the properties that we can see and
- Chemical properties are the chemical compositions of the
For example, the physical property of water and oil is that they are liquids, but their smell and taste is different. This is because their chemical composition is different. Thus, these are their chemical properties.
What is a Chemical reaction?
Changes in the physical appearance of a substance are called Physical changes and the changes in the chemical composition of a substance are called Chemical changes.
For example,
- When the ice melts to water, there is a change in its appearance, but the chemical property of water and ice is the That is both are made up of water molecules. Only their state is different. This is a physical change.
- When a piece of paper is burnt, the result is ash. On burning, the paper reacts with air and gives rise to new molecules. There is change not only in its physical appearance but also in its chemical composition. This is a chemical
When substances react with some other substance and undergo a chemical change, it is called a Chemical reaction.
What are the types of substances?
Based on the concept of chemical reaction, there exist two types of substances: elements and compounds.
- Elements: These are substances that cannot be broken down into simpler forms by chemical reactions
- Compounds: These are substances that formed when two or more elements combine chemically.