Reviewing Amino Acids

What is a characteristic of polar molecules?

• Symmetrical electron distribution.

• Asymmetrical electron distribution.

• Made up entirely of the same element.

• No electronegativity.

What are polar molecules particularly good at?

• Dissolving non-polar compounds

• Dissolving solids composed of polar or ionic compounds

• Dissolving metals

• Dissolving gases

H₂O is a _____ molecule.

• polar

• non-polar

Water is polar because...

• The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.
• The molecule has two poles, at which the it is colder than other regions of the molecule.
• The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.
• The water molecule is neutral.

Answer explanation

Tags

NGSS.MS-PS1-1

Methane, CH₄, has polar bonds but is not a polar molecule because ___

• of geometrical asymmetry

• of geometrical symmetry

• it's linear

• of no electronegativity differences

Is the molecule overall polar or nonpolar?

• Polar

• Nonpolar

Is the molecule overall polar or nonpolar?

• Polar

• Nonpolar

Is the molecule overall polar or nonpolar?

• Polar

• Nonpolar

Identify the amino group, carboxyl group, the R group, and any additional functional groups.

a

b

c

d

Carboxyl group

R group

Main amino group

Additional amino group

What functional group(s) are present in the R group for the amino acid, Arginine?

• Methyl group

• Hydroxyl group

• Carbonyl group

• Amino group

• No functional groups are present.