Mid-Unit 2.11 Assessment

All organic compounds contain

• carbon

• nitrogen

• phosphorous

• mercury

Which type of bond holds atoms together in a water molecule?

• nuclear bond

• ionic bond

• covalent bond

• organic bond

According to the concept of entropy, what will likely happen to most molecules over time?

• They will remain unchanged.

• They will turn into carbon molecules.

• They will bind to other molecules.

• They will break down.

How is an organic compound different from an inorganic compound?

• Photosynthesis is responsible for organic compounds.

• Organic compounds come only from nonliving things.

• Organic compounds contain carbon atoms bonded to other atoms.

• Inorganic compounds contain oxygen atoms and hydrogen atoms.

Which statement best explains why a carbon atom can bond with itself easily?

• It is an ion.

• It has four valence electrons.

• It forms hydrogen bonds.

• It is an organic element.

How are hydrogen bonds different from covalent bonds?

• Hydrogen bonds are weaker bonds that form from molecules that have a slight positive charge on one side and a slight negative charge on the other.

• They have valence electrons.

• They are organic.

• The resulting compounds contain carbon.

Which type of molecule is fat?

• carbohydrate

• nucleic acids

• lipids

• proteins

Which statement best explains why electrical signals in the body are often based on ions?

• Ionic bonds are very strong.

• Ions contain a single atom.

• Ions are charged particles.

• Ions can gain electrons.

Why is carbon present in so many types of molecules?

• It can become an ion.

• It is abundant on earth.

• It has valence electrons.

• It can form up to four covalent bonds.

Study these diagrams. The dots represent valence electrons orbiting the nucleus of an atom. Which diagram shows the valence electron pattern for a carbon atom?

• A

• B

• C

• D