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Questions and Answers
Which of the following statements accurately describes an element?
Which of the following statements accurately describes an element?
- An element is a combination of atoms and molecules.
- An element is a pure substance made up of only one type of atom. (correct)
- An element is a compound composed of two or more elements.
- An element is a mixture of different substances.
What is the difference between a compound and a mixture?
What is the difference between a compound and a mixture?
- A compound is a substance made up of two or more elements chemically combined, while a mixture is a combination of substances that are not chemically combined. (correct)
- A compound is a mixture of different substances, while a mixture is a pure substance.
- A compound is a pure substance made up of only one type of atom, while a mixture is a combination of atoms and molecules.
- A compound is a substance that cannot be broken down into simpler substances, while a mixture can be separated into its components.
What is the atomic number of an element?
What is the atomic number of an element?
- The number of protons in the nucleus of an atom of that element. (correct)
- The average mass of all the isotopes of that element.
- The number of electrons in the outermost energy level of an atom of that element.
- The total number of protons and neutrons in the nucleus of an atom of that element.
Which of the following is NOT a characteristic of a chemical reaction?
Which of the following is NOT a characteristic of a chemical reaction?
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Which of the following is an example of a physical change?
Which of the following is an example of a physical change?
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Which of the following is NOT a state of matter?
Which of the following is NOT a state of matter?
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