Understanding the Basics of Matter

What defines a pure substance?

• A substance that can be broken down into simpler substances

• A substance made of two or more types of atoms

• A substance that changes properties under different conditions

• A substance made up of only one type of atom

What is the smallest unit of an element that retains all the properties of that element?

• A molecule

• A compound

• An atom

• A particle

What is the relationship between atoms and elements?

• Atoms form elements when combined chemically

• Elements are types of atoms

• Atoms are the building blocks of elements

• Atoms and elements are unrelated

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How many different types of elements are currently known?

• Less than 90

• More than 150

• Exactly 116 or 117

• About 100

Can elements be broken down into a simpler substance?

• Yes, by physical means

• Yes, using chemical reactions

• No, they are pure substances

• Only certain elements

What property do all atoms of a single element share?

• Chemical properties

• Color

• Size

• Shape

What is a molecule?

• Two or more atoms chemically combined

• A single type of atom

• The smallest part of a compound retaining its chemical properties

• A pure substance

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What distinguishes a compound from a molecule?

• Compounds are made up of two or more elements chemically combined

• There is no difference

• Molecules are not chemically combined

• Compounds can only be made of the same type of atom

Are the terms 'molecules' and 'compounds' interchangeable?

• Yes, always

• Yes, but with context

• No, never

• Only in scientific literature

Are compounds made up of molecules?

• No, they are made of elements

• Yes, exclusively

• No, they are made of atoms

• Yes, but not always

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