biology review

Which elements below will most likely form a covalent bond?

• Na and Cl

• C and O

• H and H

• Ni and Cl

• H and O

Tags

NGSS.HS-PS1-1

Which elements below are most likely to form an ionic bond?

• Na and Cl

• C and O

• N and O

• Si and Cl

• H and O

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

NGSS.HS-PS1-3

Elements with atomic numbers of 6, 14, and 22 all have what in common?

• Same number of electrons

• Same atomic mass

• Same valence and will form the same number of covalent bonds

• All of the above

• None of the above

Tags

NGSS.HS-PS1-1

Geckos can climb smooth walls and spiders can walk on water. Identify the types of bonds involved that allow both creatures to do these things.

• Polar covalent and van der waals

• nonpolar covalent and polar covalent

• van der waals and hydrogen bonds

• ionic bonds and hydrogen bonds

• None of the above

What type of bond between water molecules is responsible for giving water special properties, like high cohesion?

• ionic bonds

• nonpolar covalent bonds

• polar covalent bonds

• hydrogen bonds

Buffers can bind to one of the chemicals shown in the picture. How will that change this reversible reaction?

• The reaction will come to a dead stop

• HCO₃- concentration will increase.

• HCO₃- concentration will release fewer ions

• H₂CO₃ concentration will not change.

• H₂O will increase

Tags

NGSS.HS-PS1-5

What are the 4 emergent properties of water that are important for life?

• cohesion, temperature moderation, hydrogen bonds expand when in solid form, universal solvent

• cohesion, hydrogen bonds expand when in solid form, capillarity, heat of vaporization

• temperature moderation, universal solvent, high surface tension, capillarity

• polarity, hydrogen bonding, high specific heat, capillarity

If a molecule has a high specific heat, that is directly related to which of the following?

• At boiling, it changes into a vapor

• More heat is needed to raise its temperature?

• When in solid form, it will float on its liquid form

• If salt is added, then that will lower its freezing point

Tags

NGSS.HS-PS3-4

What will result when water is treated with chemicals that reduce its surface tension?

• Droplets will form a thin film instead of beads

• Droplets will be smaller when dropping from a sink

• Water striders (Jesus bugs) will sink

• All of the above will occur

• None of the above will occur

Tags

NGSS.HS-ESS2-5

Which one is a compound?

• Gold (Au)

• Phosphorus (P)

• Nitrogen (N)

• All of these

• None of these

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5