Comprehension Check 1: Basic Chemistry and Properties of Water

Which of the following lists some of the levels of biological organization from less complex to more complex?

• atoms, cells, molecules, organs

• atoms, molecules, cells, organs

• atoms, molecules, organs, cells

• molecules, atoms, cells, organs

Electronegativity is

• the repulsion of electrons in one atom for electrons in another atom.

• the negative charge surrounding the nucleus of an atom.

• the number of electrons in the outermost electron shell.

• the attraction of an atom for the electrons in a covalent bond.

Identify the correct physiological function(s) of water in the body.

• Thermoregulation when too hot

• Thermoregulation when cold

• Transportation of nutrients and waste products

• All of the above

Water is a polar covalent molecule due to which of the following reasons?

• It has an equal distribution of electrons between hydrogen and oxygen atoms.

• It has an unequal distribution of electrons, creating a partial negative charge on oxygen and a partial positive charge on hydrogen.

• It has an overall negative charge.

• It has an overall positive charge.

Choose the correct statement(s) about water.

• It consists of two hydrogen atoms and one oxygen atom.

• Water is a universal solvent and many substances dissolve in it, allowing water to transport nutrients

• Individual water molecules contain hydrogen bonds and multiple water molecules associate through covalent bonds.

• Both a and b.

Tags

NGSS.HS-ESS2-5

What causes hydrogen bonds to form between water molecules?

• The attraction between the partial positive charge of hydrogen and the partial negative charge of oxygen

• The complete transfer of electrons from hydrogen to oxygen

• The sharing of electrons between hydrogen atoms

• Differences in atomic number

If you were to draw a diagram of water molecules in a liquid state, how would you depict hydrogen bonds?

• As solid lines connecting hydrogen atoms of different molecules

• As solid lines connecting oxygen atoms of different molecules

• As arrows showing electron flow between molecules

• As dashed lines connecting the oxygen atom of one molecule to the hydrogen atom of another

Which type of bond connects the hydrogen and oxygen atoms within a water molecule?

• Hydrogen bond

• Polar covalent bond

• Metallic bond

• Ionic bond

A polar covalent bond between two atoms results from

• whether the bond is single or not.

• the shape of the molecule that has the bond.

• two atoms that do not have similar electronegativities.

• the presence of two ions close to each other.

Tags

NGSS.HS-PS1-1

Which property of water, resulting from hydrogen bonding, is crucial for regulating temperature in organisms?

• Low specific heat

• High density of ice compared to liquid water

• High heat of vaporization

• High surface tension

Tags

NGSS.HS-ESS2-5