Unit 4 test review

Salinity is measured in units called _______________________________.

• parts per thousand

• grams per liter

• milligrams per liter

• percentage

Changing the salinity of water could affect which two things about the water?

• Temperature and density

• Color and taste

• Density and boiling point

• Viscosity and pH level

The picture below demonstrates buoyancy. Which principle explains how an object is able to float, and why an object will sink?

• Archimedes' Principle

• Newton's First Law

• Pascal's Law

• Bernoulli's Principle

Buoyancy depends on temperature and salinity. Which would be the easiest to float in?

• Cold saltwater ocean

• Warm freshwater lake

Ice is able to float because:

• It is denser than water

• It is less dense than water

• It is heavier than water

• It is lighter than air

Fish have swim bladders that allow them to do what?

• Float at different water depths

• Breathe underwater

• Detect predators

• Communicate with other fish

Density = ____________ / ____________

• mass / volume

• volume / mass

• mass / area

• length / volume

Explain what is being modeled in the picture below. Which two properties of water cause this to happen?

• Cohesion and adhesion

• Density and viscosity

• Surface tension and capillarity

• Polarity and hydrogen bonding

How do the following affect density? Choose the correct option.

• Temperature increases density.

• Salinity decreases density.

• Pressure has no effect on density.

• Temperature decreases density, salinity increases density, and pressure increases density.

If a liquid has a pH of 11, what does that mean?

• It is acidic.

• It is neutral.

• It is basic.

• It is a strong acid.