Question
Pure Substances and Mixtures
Pure Substances and Mixtures
Two classifications of matter are pure substances and mixtures. Pure substances have a definite chemical composition, cannot be separated by physical means, and consist of one or more types of atoms.
Mixtures do not have a definite chemical composition, can be separated by physical means, and consist of two or more types of substances.
A student constructs models of elements, molecules, compounds, and mixtures using different colors of balls and black plastic sticks. A key for each element and the chemical bond is shown.
Multiple Choice Question
The student makes a model of ozone, which consists of three oxygen atoms. The model is shown.
Three blue balls are connected together by two black sticks in an upside-down v shape.
Which statement best categorizes ozone as an element or a molecule?
A.
A molecule, because the model consists of one type of atom held together by chemical bonds
B.
An element, because the model consists of one type of atom held together by chemical bonds
C.
A molecule, because the model consists of one type of atom and is not held together by chemical bonds
D.
An element, because the model consists of one type of atom and is not held together by
Pure Substances and Mixtures
Two classifications of matter are pure substances and mixtures. Pure substances have a definite chemical composition, cannot be separated by physical means, and consist of one or more types of atoms.
Mixtures do not have a definite chemical composition, can be separated by physical means, and consist of two or more types of substances.
A student constructs models of elements, molecules, compounds, and mixtures using different colors of balls and black plastic sticks. A key for each element and the chemical bond is shown.
Multiple Choice Question
The student makes a model of ozone, which consists of three oxygen atoms. The model is shown.
Three blue balls are connected together by two black sticks in an upside-down v shape.
Which statement best categorizes ozone as an element or a molecule?
A.
A molecule, because the model consists of one type of atom held together by chemical bonds
B.
An element, because the model consists of one type of atom held together by chemical bonds
C.
A molecule, because the model consists of one type of atom and is not held together by chemical bonds
D.
An element, because the model consists of one type of atom and is not held together by
Answers
GPT-4o mini
The statement that best categorizes ozone as an element or a molecule is:
**A. A molecule, because the model consists of one type of atom held together by chemical bonds.**
Ozone (O₃) is composed of three oxygen atoms, and since it consists of more than one atom bonded together, it is classified as a molecule. However, because all the atoms in ozone are of the same type (oxygen), it does not qualify as a compound. Thus, the best choice is A.
**A. A molecule, because the model consists of one type of atom held together by chemical bonds.**
Ozone (O₃) is composed of three oxygen atoms, and since it consists of more than one atom bonded together, it is classified as a molecule. However, because all the atoms in ozone are of the same type (oxygen), it does not qualify as a compound. Thus, the best choice is A.