Question

H. Distinguish between the following pairs.
1. Element and compound
2. Pure substance and mixture
3. Atom and molecule​

Answer 1

Explanation:

Element

A substance that cannot be broken down into simpler substances by chemical means. An element is composed of atoms that have the same atomic number, that is, each atom has the same number of protons in its nucleus as all other atoms of that element.

compound

A compound is a substance formed when two or more chemical elements are chemically bonded together. ... Example 1: Pure water is a compound made from two elements - hydrogen and oxygen. The ratio of hydrogen to oxygen in water is always 2:1. Each molecule of water contains two hydrogen atoms bonded to a single oxygen atom.

pure substance

substance is a material that has a constant composition (is homogeneous) and has consistent properties throughout the sample. ... In chemistry, a pure substance consists of only one type of atom, molecule, or compound. In other disciplines, the definition extends to homogeneous mixtures

mixture

Any substance that has a uniform and unchanging composition is considered to be pure. Examples of pure substances include elements. A mixture is a combination of two or more pure substances in which each pure substance retains its individual chemical properties.

atoms

The definition of an atom is the smallest component of an element, characterized by a sharing of the chemical properties of the element and a nucleus with neutrons, protons and electrons.

molecules

Molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance.