Ch 8 - Elements and Chemical Bonds

Define chemical bond.

• is not a force but holds the elements together through a chemical reaction

• is a non-contact force to holds two or more atoms together

• is a force that holds two or more atoms together

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-3

Define valence electron.

• an innermost electron of an atom that participates in chemical bonding

• an outermost electron of an atom that participates in chemical bonding

• an outermost electron of an atom, they do not participate in chemical bonding

Which one is an electron dot diagram?

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• 
• 
• 

Define covalent bond.

• is a ionic bond formed when two atoms share one or more pairs of valence electrons.

• is a chemical bond formed when two atoms share one or more pairs of valence electrons.

• is a metallic bond formed when two atoms share one or more pairs of valence electrons.

Tags

NGSS.HS-PS1-1

Define molecule.

• a group of ions held together by ionic bonding that acts as an independent unit

• a group of metals held together by metallic bonding that acts as an independent unit

• a group of atoms held together by covalent bonding that acts as an independent unit

Tags

NGSS.MS-PS1-1

What is a polar molecule?

• a molecule that has a partial + and a partial - end, because of unequal sharing of electrons

• a molecule that is all positive

• a molecule that is all negative

Tags

NGSS.MS-PS2-3

What is a chemical formula?

• a group of numbers that represent the number of atoms of each element that makes up a compound

• a group of chemical symbols and numbers that represent the elements and the number of atoms of each element that makes up a compound

What is an ion?

• an atom that is positively charged

• an atom that is negatively charged

• an atom that is no longer electrically neutral because it has lost or gained VE

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What is an ionic bond?

• the attraction of two + charged ions

• the attraction between + and - charged ions in an ionic compound

• the attraction of two - charged ions

What is a metallic bond?

• a bond formed when many metal atoms share their pooled VE

• a bond formed when many ions share their pooled VE