Elements and Compounds (TEKS 7.6.A & 7.6.B) Quiz

Use the periodic table to identify which statements best describes carbon dioxide, CO₂.

• It is an element that consists of 3 total atoms.

• It is a molecule that consists of 3 total atoms.

• It is an element that consists of 3 total molecules.

• It is a compound that consists of 3 total molecules.

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Think about the similarities and differences between elements and compounds. Which of the following is true?

• A. Elements and compounds are made of one kind of atom.

• B. Elements and compounds are made of more than one kind of atom.

• C. Elements are made of molecules, and compounds are made of atoms.

• D. Elements are made of one kind of atom, and compounds are made of more than one kind of atom.

Glucose has the chemical formula C₆H₁₂O₆. Which of the following is true about one molecule of glucose?

• It consists of 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

• It consists of 12 carbon atoms, 6 hydrogen atoms, and 12 oxygen atoms.

• It consists of 6 carbon atoms, 6 hydrogen atoms, and 12 oxygen atoms.

• It consists of 12 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

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Elements and compounds are similar in some ways and different in others. Circle THREE correct answers.

• The chemical formula for chlorine gas is C.

• An element’s symbol must start with a capital letter.

• Elements are represented by a single chemical symbol.

• A compound, such as water, can have different chemical formulas.

• Compounds have multiple chemical symbols that together represent the elements that constitute the compound.

Which substance is a compound?

• copper

• magnesium

• saltwater

• water

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How many elements are present in this compound? (Careful!)

Mg₂As₃COHNi₂

• 2

• 4

• 6

• 10

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Element or compound? O_2.

Select ALL that apply.

• Element
• Compound
• Molecule

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