Elements and Compounds

Which of the following statements correctly describes the difference between an element and a compound?

• An element is made up of two or more types of atoms, while a compound is made up of only one type of atom.

• An element cannot be broken down into simpler substances by chemical means, while a compound can be broken down into simpler substances.

• An element is always a solid, while a compound can be a solid, liquid, or gas.

• An element is always found in nature, while a compound is always man-made.

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DOK Level 2: Skill/Concept

Which of the following is the correct chemical formula for water?

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DOK Level 2: Skill/Concept

• Sodium and Carbon

• Sodium and Chlorine

• Nitrogen and Chlorine

• Nitrogen and Carbon

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DOK Level 2: Skill/Concept

Which of the following is a compound?

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DOK Level 2: Skill/Concept

What is the chemical formula for table salt?

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DOK Level 2: Skill/Concept

Which of the following is an element?

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DOK Level 2: Skill/Concept

• Hydrogen, Sulfur, and Oxygen

• Hydrogen, Sulfur, and Nitrogen

• Helium, Sulfur, and Oxygen

• Helium, Sulfur, and Nitrogen

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DOK Level 2: Skill/Concept

Which of the following chemical formulas represents a compound?

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DOK Level 2: Skill/Concept

What is the chemical formula for carbon dioxide?

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DOK Level 2: Skill/Concept

Which of the following statements is true about elements and compounds?

• Elements can be broken down into simpler substances, while compounds cannot.

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

• Elements are always found in pairs, while compounds are always single atoms.

• Compounds are always gases, while elements are always solids.

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DOK Level 2: Skill/Concept