Answer:
Explanation:
1. A pure substance has a definite composition.
Matter can be classified as pure and impure substances. Pure substances are distinct substances having very definite composition and homogeneous throughout.
2. A mixture is composed of two or more types of matter that can be present in varying amounts.
Mixtures are impure substances that are made up of indefinite composition with their constituents retaining their identities.
3. A solution is a homogeneous mixture.
A solution is a homogeneous mixture made up of solutes dissolved in a solvent. The solute is the substance being dissolved. The solvent is the dissolving medium.
4. A mixture that is no uniform throughout is a heterogeneous mixture.
Heterogeneous mixtures are not uniform all through. They have their constituents in different phases.
5. A pure substance that cannot be broken down chemically is an element.
An element is a distinct substance that cannot be split-up into simpler substances. Such substances are made up of only one kind of atom.
6. A characteristic of matter that’s not associated with a change in it’s chemical composition is known as a physical property.
The physical property of matter tells us everything about it when no change is occurring to its constituent. They are usually observed with our senses or instruments or pieces of apparatus.
7. Wax melting is an example of a physical change in the state of matter.
Physical change is one that alters the physical property of matter especially the form and state.
Melting of wax is a phase change from solid to liquid. It is a reversible process.
8. A banana peel turning brown is an example of chemical change in the state of matter.
Chemical change is a change that alters the chemical properties of matter. Here, new kind of matter is produced.
The browning of banana peel due to spoilage is a chemical process. We cannot reverse this process.
