Ls 20-Modeling Ions, Molecules and Compounds Quiz

Which of the following substances is composed of atoms?

• Carbon dioxide

• Hydrogen gas

• Water

• Helium

What defines a molecule?

• A particle with one atom

• A particle with multiple atoms

• A particle with only one type of atom

• A particle with different types of atoms

Which of the following is a pure element?

• Water

• Sodium chloride

• Carbon dioxide

• Oxygen gas

What is a compound?

• A substance with only one type of atom

• A substance with only one molecule

• A substance with multiple types of atoms

• A substance with no atoms

How do atoms and ions differ?

• Atoms have more protons than electrons

• Ions have equal numbers of protons and electrons

• Atoms are electrically neutral

• Ions are always negatively charged

What is the charge of an aluminum ion with 13 protons and 10 electrons?

• -1

• -3

• 3

• +1

Which of the following is an ionic compound?

• Water

• Carbon monoxide

• Magnesium chloride

• Sulfur hexafluoride

What characterizes a covalent compound?

• Electrons are transferred

• Contains positive and negative charges

• Composed of metals and nonmetals

• Composed of nonmetals

Which of the following is a molecular compound?

• Calcium oxide

• Sodium chloride

• Ammonium chloride

• Carbon monoxide

What is an exception to the general rule for identifying ionic compounds?

• Sodium chloride

• Ammonium chloride

• Magnesium chloride

• Calcium oxide