Chemical Bonds Pre-Test

What is a valence electron?

• An electron in the nucleus

• An electron in the innermost shell

• An electron in the outermost shell

• An electron shared between atoms

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which type of bond involves the sharing of electrons? There are TWO correct answers. Please select both answers.

• Ionic

• Covalent

• Metallic

• Hydrogen

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NGSS.HS-PS1-1

Which of the following statements is NOT true about chemical bonds?

• Ionic bonds occur between metals and nonmetals

• Covalent bonds involve the transfer of electrons

• Chemical bonds determine the properties of substances

• Bonds are essential for forming molecules

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NGSS.HS-PS1-1

Describe the octet rule in your own words.

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NGSS.HS-PS1-2

How are molecules and ions different in terms of their charges?

• Molecules have no charge, and ions have a positive or negative charge.

• Molecules have a positive charge, and ions have no charge.

• Molecules have a negative charge, and ions have no charge.

• Molecules and ions both have a positive charge.

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Match the following compounds with their bond type: NaCl, H₂O, MgCl₂, O₂

• NaCl - Ionic, H₂O - Covalent, MgCl₂ - Ionic, O₂ - Covalent

• NaCl - Covalent, H₂O - Ionic, MgCl₂ - Covalent, O₂ - Ionic

• NaCl - Ionic, H₂O - Ionic, MgCl₂ - Covalent, O₂ - Covalent

• NaCl - Covalent, H₂O - Covalent, MgCl₂ - Ionic, O₂ - Ionic

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NGSS.HS-PS1-1

If an oxygen atom has 6 electrons in its outer shell, how many more electrons does it need to be "happy"? Explain your reasoning.

• 1 electron, because it needs 7 electrons to be stable.

• 2 electrons, because it needs 8 electrons to complete its outer shell.

• 3 electrons, because it needs 9 electrons to be stable.

• 4 electrons, because it needs 10 electrons to complete its outer shell.

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NGSS.HS-PS1-1

Consider the compound CO₂. Predict the bond type(s) present in this molecule and justify your answer.

• Ionic, because it involves a metal and a nonmetal.

• Covalent, because it involves the sharing of electrons between nonmetals.

• Metallic, because it involves metal atoms.

• Hydrogen, because it involves hydrogen atoms.

Tags

NGSS.HS-PS1-1

Draw a model of a sodium atom transferring an electron to a chlorine atom. Label the charges on the resulting ions.

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NGSS.HS-PS1-2

Illustrate how two oxygen atoms share electrons to form a molecule of O₂.

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NGSS.HS-PS1-2