Table of Contents
What are all substances made of?
All matter is made up of very small particles called atoms. Atoms are the building blocks of all matter. When a substance contains only one type of atom, it is called an element. Each element has a special name and unique properties that are different from all the rest of the elements.
What are the substance made of similar types of particles called?
Elements are the basic building blocks for all types of substances. If a substance contains more than one type of atom, it is a compound or a mixture.
Which type of substance is made up of at least two different chemically combined elements?
Compounds
Compounds are made up of two or more elements combined in definite quantities and in definite proportions by chemical bonds. Substances are pure forms of matter that cannot be separated or purified further by physical means; include compounds and elements.
Is oxygen pure or impure?
*Note: pure oxygen gas consists of molecules but it is still considered an element, rather than a compound, as the molecules are made up of a single type of element….Pure Substances.
| Pure Substance | Element or Compound? | Consists of: |
|---|---|---|
| Ammonia (NH3) | compound | ammonia molecules |
What are the 2 types of substances?
The two main types of pure substances are compounds and elements.
How do you separate pure substances of oxygen?
Explanation: Substance 1 Oxygen cannot be separated. Substance 2 Water can be separated by the process of electrolysis.
What is a compound made of hydrogen and carbon called?
Many different types of compounds contain hydrogen and carbon – but along with other elements such as oxygen. A molecule that consists *only* of hydrogen and carbon typically refers to a class of compounds called hydrocarbons. A larger group of organic molecules that also contain oxygen are called carbohydrates.
How many atoms are in a mole of carbon-12?
The mole (or mol) represents a certain number of objects. SI def.: the amount of a substance that contains the same number of entities as there are atoms in 12 g of carbon-12. Exactly 12 g of carbon-12 contains 6.022 x 10 23 atoms. 1 mole contains 6.022 x 1023
What are the chemical formulas for oxygen and nitrogen?
For example, most samples of the elements hydrogen, oxygen, and nitrogen are composed of molecules that contain two atoms each (called diatomic molecules) and thus have the molecular formulas H 2, O 2, and N 2, respectively.
How are compounds formed when two elements combine?
Compounds are formed when two or more elements chemically combine, resulting in the formation of bonds. For example, hydrogen and oxygen can react to form water, and sodium and chlorine can react to form table salt.