Podcast
Questions and Answers
Which of the following statements about atoms is true?
Which of the following statements about atoms is true?
- Atoms are the smallest particle of a substance (correct)
- Atoms have no properties
- Atoms always exist independently
- Atoms cannot join together to form molecules
What is a molecule?
What is a molecule?
- A single atom
- A type of pure substance
- A group of atoms joined together (correct)
- A compound element
Which of the following is an element?
Which of the following is an element?
- Sugar
- Water
- Salt
- Oxygen (correct)
How many natural elements are there on Earth?
How many natural elements are there on Earth?
What happens when two or more atoms join together?
What happens when two or more atoms join together?
What is the smallest particle of a substance?
What is the smallest particle of a substance?
Which of the following can exist independently?
Which of the following can exist independently?
What is formed when two or more atoms join together?
What is formed when two or more atoms join together?
Which of the following is made up of only one kind of atom?
Which of the following is made up of only one kind of atom?
How can chemical substances be divided into major subgroups?
How can chemical substances be divided into major subgroups?
Study Notes
Atomic Structure
- Atoms are the smallest particles of a substance and may or may not exist independently
- Molecules are formed when two or more atoms join together and can exist independently
Chemical Substances
- Chemical substances can be divided into two major subgroups: pure substances and mixtures
- Pure substances can be elements or compounds
Elements
- An element is a substance that is made up of only one kind of atom
- Elements cannot be broken down into simpler substances by chemical means
- Examples of elements: silver, gold, aluminium, hydrogen, oxygen
- Each element has its own distinct set of properties
- The atoms of an element will have all the properties of the particular element
- Fact file: There are over 118 known elements on earth, with 94 being natural
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Description
Test your knowledge on chemical substances, atoms, molecules, elements, compounds, and pure substances. Explore the concepts of atoms forming molecules, the distinction between elements and compounds, and the classification of chemical substances into pure substances and mixtures.
