Introduction to Atoms and Molecules

What is the basic building block of matter?

• atom

• molecule

• element

• proton

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What do you call a group of atoms held together by chemical bonds?

• molecule

• mixture

• element

• solution

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Which of the following is made up of only one kind of atom and cannot be broken down into simpler substances?

• elements

• atoms

• molecules

• compounds

Which of the following best describes a compound?

• It contains only one type of atom

• It is made up of atoms of different elements chemically bonded together

• It is a mixture of different substances

• It is made up of atoms of the same element

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Molecules are formed when _______ join together. 

• atoms

• ions

• protons

• electrons

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Which of the diagrams pictures shows a COMPOUND?

• I

• II

• III

• IV

• None of the above

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Which of the diagrams pictures shows an element?

• I

• II

• III

• IV

• None of the above

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Look at the image. It can be described as

• an element and a molecule

• an element and an atom

• a compound and a molecule

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Look at the image. It can be described as

• an element made of molecules

• an element made of atoms

• a compound and a molecule

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Take a look at the image. Which of the following molecules are ALSO classified as compounds? Select ALL that apply!

• nitrogen oxide

• water

• nitrogen dioxide

• chlorine

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