Chemical Bonds Post Test

Why do atoms share electrons in covalent bonds?

• to become ions and attract each other

• to attain a noble-gas electron configuration

• to become more polar

• to increase their atomic numbers

Tags

NGSS.HS-PS1-1

Which of the following elements can form diatomic molecules held together by triple covalent bonds?

• carbon

• oxygen

• fluorine

• nitrogen

Which of the following diatomic molecules is joined by a double covalent bond?

• O₂

• Cl₂

• N₂

• He₂

If the polar bears represent atoms and the ice cream scoops represent electrons, what type of bond is represented in the illustration below?

• ionic

• polar covalent

• nonpolar covalent

• nonpolar ionic

Tags

NGSS.HS-PS1-2

If the polar bears represent atoms and the ice cream scoops represent electrons, what type of bond is represented in the illustration below?

• ionic

• polar covalent

• nonpolar covalent

• nonpolar ionic

Tags

NGSS.HS-PS1-3

Which type of bond could be shown by a polar bear taking the ice cream cone completely away from the penguin?

• ionic

• polar covalent

• nonpolar covalent

• nonpolar ionic

Which of the following best explains what happens in an ionic bond?

• The bonded electrons are equally shared between the atoms.

• The bonded electrons spend more time around the more electronegative atom.

• An electron (or electrons) is given up to the more electronegative atom.

• An electron (or electrons) is given up to the less electronegative atom.

Tags

NGSS.HS-PS1-3

Which of the following best explains what happens in a polar covalent bond?

• The bonded electrons are equally shared between the atoms.

• The bonded electrons spend more time around the more electronegative atom.

• An electron (or electrons) is given up to the more electronegative atom.

  
  

• An electrons spend more time around the less electronegative atom.

Which of the following best explains what happens in a nonpolar covalent bond?

• The bonded electrons are equally shared between the atoms.

• The bonded electrons spend more time around the more electronegative atom.

  
  

• An electron (or electrons) is given up to the more electronegative atom.

• The bonded electrons spend more time around the less electronegative atom.

Tags

NGSS.HS-PS1-1

How would the atoms in a CH₄ molecule be portrayed in the comic strip—as polar bears, penguins, or both?

• The C would be the polar bear and the H’s would be penguins.

  
  

• The C would be the penguin and the H’s would be polar bears.

• All of the atoms would be represented as polar bears.

• All of the atoms would be represented as penguins.

Tags

NGSS.HS-LS1-6