Chemistry of Water/Ocean

The chemical formula of water is

• HO

• H₂O

• H₃O

• HO₂

Tags

NGSS.MS-PS1-1

Water molecules are held together by which type of bond?

• Ionic

• Non-polar covalent

• Hydrogen

• Polar covalent

During a summer picnic, Grace, Scarlett, and Charlotte noticed a water strider skating along the top of the pond. They wondered why the water strider can skate on the water surface. What could be the reason?

• It has a strong ionic bond.

• Hydrogen bonds result in cohesion, which creates high surface tension.

• Water striders have adapted to take advantage of water adhesion.

• There is low surface tension of water.

Tags

NGSS.MS-PS2-5

Which end of the water molecule has a slightly positive charge?

• The oxygen end

• The hydrogen end

• Both ends are slightly positive

• Neither end is positive

Tags

NGSS.MS-PS1-1

Refer to the picture of water sticking to a leaf. This is occurring because of:

• Adhesion

• Cohesion

Describe cohesion.

• Water molecules are attracted to other substances.

• Water molecules climb upwards against the force of gravity.

• Water molecules dissolve many substances because of its polarity.

• Water molecules are attracted to other water molecules.

What are the attractions between water molecules called?

• Covalent bonds

• Ionic bonds

• Polar bonds

• Hydrogen bonds

Which molecule has opposite electric charges at opposite ends?

• Cohesion

• Polar molecule

• Hydrogen bond

• Solution

During a science experiment, Mason poured water on a plastic surface and observed that the water spread out and stuck to the surface. Arjun, who was watching, asked, 'What does this phenomenon represent?' What would be the correct response from Olivia?

• The ability of water to stick to itself

• The ability of water to stick to other substances

• The combined strength of cohesion of all water molecules

• Tape, glue, and other adhesives

Evelyn conducted a science experiment in her school lab. She measured the pH of a solution and found it to be 3.6. This solution would be...

• Acidic

• Basic

• Neutral

• Both acidic and basic

Tags

NGSS.MS-PS1-2