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Chemical Substances: Atoms, Molecules, Elements, Compounds Quiz

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Chemical Substances: Atoms, Molecules, Elements, Compounds Quiz

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Questions and Answers

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?

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?

Sugar

Water

Salt

Oxygen (correct)

How many natural elements are there on Earth?

94 Signup and view all the answers

What happens when two or more atoms join together?

They become molecules Signup and view all the answers

What is the smallest particle of a substance?

Atom Signup and view all the answers

Which of the following can exist independently?

Atom Signup and view all the answers

What is formed when two or more atoms join together?

Compound Signup and view all the answers

Which of the following is made up of only one kind of atom?

Element Signup and view all the answers

How can chemical substances be divided into major subgroups?

By composition Signup and view all the answers

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.