Unit 4 Review (Ocean Chemistry and Movement)

The total amount of dissolved salts in a sample of water is the ________ of that sample.

The substance known as table salt, ______ ________, is the salt present in the greatest amount in ocean water.

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.

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

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

Bleach is a strong base. What is the pH level of bleach?

• 13

• 9

• 1

• 6

Select two reasons why salinity can increase.

• Evaporation occurs, causing water to change into water vapor and leaving salt behind.

• Freshwater is added to the ocean at the mouths of large rivers.

• Freshwater is added by rain, snow, and melting ice.

• Surface water freezes into ice, leaving salt behind.