Physical Science Unit 8 - Elements and Bonds (Practice)

If the elements in a molecule are not equally sharing the electrons, the molecule will be asymmetrical or ________.

• nonpolar

• polar

• ionic

• metallic

What elements generally make an ionic bond?

• metal and nonmetal
• 2 or more nonmetals
• metal and metal
• none of the above

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What elements generally make a covalent bond?

• metal and nonmetal
• 2 or more nonmetals
• metal and metal
• none of the above

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In chemical compounds, covalent bonds form when

• the electronegativity difference between two atoms is very large

• valence electrons are transferred between metal and nonmetal

• pairs of electrons are shared between two nonmetal atoms

• a sea of mobile electrons surround the cations

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An ionic bond forms when

• pairs of electrons are shared between two nonmetal atoms.

• a sea of mobile electrons surround the cations

• valence electrons are transferred between metal and nonmetal

• the electronegativity difference between two atoms is very large

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What is a valence electron?

• an electron that is found in the outermost shell of an atom. 
• an electron found in the innermost shell of an atom.
• an electron found in the middle shell.

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Which of the following is an ionic compound:

• CH₄
• I₂
• LiBr₂
• CO

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Which of the following is a covalent compound:

• CaO

• NaCl

• BaCl₂

• CO₂

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Predict the bond that will form between Be and F.

• Ionic
• Covalent
• Metallic

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Name of the following covalent molecule: N₂O

• nitrogen oxide

• nitrogen (II) oxide

• dinitrogen monoxygen

• dinitrogen monoxide