7.PS1.1 Atoms and Molecules

• It is made of two hydrogen atoms and one oxygen atom bonded together.

• It is made of three oxygen atoms bonded together.

• It is made of one hydrogen atom and two oxygen atoms bonded together.

• It is made of two hydrogen atoms only.

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Which statement correctly identifies the basic unit of matter?

• Molecules are the basic units of matter.

• Atoms are the basic units of matter.

• Compounds are the basic units of matter.

• Elements are the basic units of matter.

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• One carbon atom and two oxygen atoms

• Two carbon atoms and one oxygen atom

• One carbon atom and one oxygen atom

• Two carbon atoms and two oxygen atoms

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• Two oxygen atoms bonded together

• One oxygen atom bonded to one hydrogen atom

• Two oxygen atoms not bonded

• One oxygen atom bonded to two hydrogen atoms

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Which of the following substances is made up of only one type of atom?

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• One sodium atom and one chlorine atom bonded together

• Two sodium atoms bonded together

• One sodium atom and two chlorine atoms bonded together

• Two chlorine atoms bonded together

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• Model it as six carbon atoms, twelve hydrogen atoms, and six oxygen atoms bonded together, showing it is a complex molecule made of repeating units.

• Model it as one carbon atom, one hydrogen atom, and one oxygen atom bonded together, showing it is a simple molecule.

• Model it as six carbon atoms only, showing it is an element.

• Model it as twelve hydrogen atoms only, showing it is a compound.

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• Arrange alternating sodium and chlorine atoms in a repeating three-dimensional pattern.

• Place one sodium atom next to one chlorine atom only.

• Group several sodium atoms together, separate from chlorine atoms.

• Arrange sodium and chlorine atoms randomly.

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• The claim is correct because both contain oxygen atoms.

• The claim is correct because both are gases.

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Suppose you are given two unknown substances. Substance A is made of only one type of atom, while Substance B is made of two different types of atoms bonded together. How would you classify each substance, and what does this tell you about their atomic composition?

• Substance A is an element; Substance B is a compound. This shows that elements have only one type of atom, while compounds have two or more types of atoms bonded together.

• Both are elements because they are made of atoms.

• Substance A is a compound; Substance B is an element.

• Both are compounds because they are made of atoms.

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