What is a pure substance that is made up of more than one element?
Compound. A pure substance, basically composed of two or more elements and chemically combined in a fixed proportion is called a compound. Therefore, water is a compound. It has two elements, hydrogen and oxygen, combined in a fixed ratio.
Is a pure substance an atom?
An atom is the smallest unit of a pure substance or element that can exist and still retain the properties of the original substance or element. Key concepts: common substances, such as air, water, wood and cloth are mixtures of materials and can be chemically or physically broken down into simpler substances.
Can a pure substance have more than one element?
When we speak of a pure substance, we are speaking of something that contains only one kind of matter. This can either be one single element or one single compound, but every sample of this substance that you examine must contain exactly the same thing with a fixed, definite set of properties.
Is a pure substance containing two or more elements?
A compound is a pure substance containing two or more elements that have been chemically combined in a fixed proportion. The elements carbon and hydrogen combine to form many different compounds.
What is made of one or more elements?
Compound. A pure substance made from more than one type of element chemically bonded together. Elements bond in fixed ratios and so can be represented by a chemical formula.
What two substances are pure?
Pure Substances
| Pure Substance | Element or Compound? | Consists of: |
|---|---|---|
| Lead (Pb) | element | lead atoms |
| Oxygen gas (O2) | element | oxygen molecules* |
| Water (H2O) | compound | water molecules |
| Ammonia (NH3) | compound | ammonia molecules |
What is a pure substance in science?
A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.
Is the substance made of one type of atom yes or no?
Element. A pure substance that is listed on the periodic table and only has one type of atom in it. There are over 100 elements.
