What is the correct chemical formula for water?

• H₂O

• HO₂

• H₂O₂

• H₂O3

Tags

NGSS.MS-PS1-1

Which of the following is an example of COHESION?

• water sticking to water

• water sticking to glass

• oil sticking to plastic

• hydrogen sticking to oxygen

a molecule in which opposite ends have opposite electric charges

• cohesion

• polar molecule

• hydrogen bond

• solution

Tags

NGSS.MS-PS2-3

Which characteristic of water will allow a paperclip to remain floating on water when the paperclip is gently placed on top of the water?

• adhesion

• surface tension

• solvent properties

• nonpolar

Large bodies of water do not quickly fluctuate in temperature. Why?

• Water is a solvent.

• Water has a high heat capacity.

• Water acts as a buffer.

• Water is non-polar.

Tags

NGSS.MS-PS3-3

Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?

• The insects are light enough so they do not break the hydrogen bonds holding the water molecules together

• The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next

• The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.

• The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.

Tags

NGSS.MS-PS2-5

Attractions between water molecules are called

• Covalent bonds

• Ionic bonds

• Polar bonds

• Hydrogen bonds

What causes the Philippines to experience frequent earthquakes and volcanic activities?

• It is situated along the Pacific Ring of Fire.

• It is near the destructive plate boundaries where the Philippine plate and Eurasian plate subducts.

• Its islands were formed from folding of boundaries where magmas may arise.

• All of the choices

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS3-2

Preserving biodiversity is important because

• it creates income opportunities for people

• it promotes tourism in the country

• it increases the rate of survival of species in the area

• it indicates effective laws made by the government officials

Tags

NGSS.MS-LS2-5

How does the Philippines benefit from the Pacific Ring of Fire?

• The land is rich in mineral deposits.

• The volcanic activities make way for more islands to form.

• The plates record daily but relatively weak earthquakes.

• More unique and beautiful beaches attract tourists.

Tags

NGSS.MS-ESS3-1