Question

tell me the answer and get 91 points
a paragraph on pure substance?
About 500-600 words
Don't cheat​

Answer 1

PURE SUBSTANCES:

In chemistry, a pure substance is a sample of matter with both definite and constant composition and distinct chemical properties. To avoid confusion, a pure substance is often referred to as a "chemical substance."

Examples of Pure Substances

Examples of pure substances include chemical elements and compounds. Alloys and other solutions may also be considered pure if they have a constant composition.

Water

Diamond

Gold

Table salt (sodium chloride)

Ethanol

Brass

Bronze

Saline solution

Examples of Substances That Are Not Pure

In general, any heterogeneous mixture is not a pure substance. If you can see differences in the composition of a material, it's impure, at least as far as chemistry is concerned.

Rocks

Oranges

Wheat

Light bulbs

Shoes

Sandwiches

Common Definition of a Pure Substance

To a non-chemist, a pure substance is anything composed of a single type of material. In other words, it is free of contaminants. So, in addition to elements, compounds, and alloys, a pure substance might include honey, even though it consists of many different types of molecules. If you add corn syrup to the honey, you no longer have pure honey. Pure alcohol could be ethanol, methanol, or a mixture of different alcohols, but as soon as you add water (which is not an alcohol), you no longer have a pure substance.

Answer 2

Answer:

What is Pure Substance?

Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure.

Pure substances are further classified as elements and compounds.

An element is a pure substance as it cannot be broken down or transformed into a new substance even by using some physical or chemical means. Elements are mostly metals, non-metals or metalloids.

Compounds, on the other hand, are also pure substances when two or more elements are combined chemically in a fixed ratio. However, these substances can be broken down into separate elements by chemical methods.

Characteristics and Properties Of Pure Substances

. Pure substances are mostly homogeneous in nature containing only one type of atoms or molecules.

.These substances mainly have a constant or uniform composition throughout.

.The substances have fixed boiling and melting points.

. A pure substance usually participates in a chemical reaction to form predictable products.

Examples of Pure Substances

All elements are mostly pure substances. A few of them include gold, copper, oxygen, chlorine, diamond, etc. Compounds such as water, salt or crystals, baking soda amongst others are also grouped as pure substances.

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