7H UNIT 1

Cohesion is when water molecules are ____________.

• attracted to each other

• repelled by each other

• attracted to oil molecules

• broken apart by heat

Adhesion is the ability of water to ____________.

• stick to other substances

• evaporate quickly

• freeze at high temperatures

• repel other substances

Tags

NGSS.MS-PS1-4

Surface tension can be observed when insects walk on water. The insect is able to walk on the water because the ____________.

• surface of the water is strong enough to support them

• water is less dense than air

• insects have sticky feet that glue them to the surface

• water evaporates quickly under their feet

Water forms a ball on a leaf: ____________

• cohesion

• adhesion

• evaporation

• condensation

An insect walks on water: [__________]

• Surface tension

• Evaporation

• Condensation

• Diffusion

Water is attracted to the glass cylinder: [__________]

• Adhesion

• Cohesion

• Evaporation

• Condensation

Which property of water best describes the tendency of water molecules to attract to surfaces, such as the inside of a beaker?

• A. Adhesion

• B. Cohesion

• C. Diffusion

• D. Transpiration

Which property of water describes the tendency of water molecules to attract to each other?

• Adhesion

• Cohesion

• Diffusion

• Transpiration

The pH of an acid is lower than that of a base, and a lower pH value indicates a stronger acid. Which statement best describes the relationship between pH and the strength of acids and bases?

• Acids have lower pH than bases, and lower pH means stronger acid.

• Acids have higher pH than bases, and higher pH means stronger acid.

• Bases have lower pH than acids, and lower pH means stronger base.

• Bases and acids have the same pH, and pH does not indicate strength.

Which of the following best describes how acids differ from bases? Select TWO correct answers

• A. Acids neutralize bases to produce salt and water

• B. Acids have a higher H+ concentration than bases

• C. Acids have a higher pH than bases