Question

1. explain why the properties of a pure substance do not vary from sample to sample.

Explanation:

A pure substance has a fixed and definite composition. All samples of a pure substance consist of the same type of atoms or molecules with consistent chemical - bonding arrangements. This uniformity in composition leads to consistent physical and chemical properties across different samples.

Answer:

The properties of a pure substance do not vary from sample to sample because a pure substance has a fixed and definite composition. All samples are made up of the same type of atoms or molecules with the same chemical - bonding arrangements, resulting in consistent physical and chemical properties.