W&W - Investigation 3 Review

When thermal energy is added to a fluid, the motion of the particles speeds up.

• True

• False

When thermal energy is added to a fluid, the particles in the fluid move farther apart.

• True

• False

When thermal energy is added to a fluid, there are fewer collisions between particles.

• True

• False

When thermal energy is added to a fluid, the particles increase in size.

• True

• False

A group of students are investigating what happens when you put different temperatures of water together. In this investigation, they have set up a vial of colorless room-temperature water and are adding purple hot water at the bottom of the vial, using a pipette.

What do you predict happens in the first 5 seconds?

• The hot water stays at the bottom of the vial.

• The hot water mixes all through the vial.

• The hot water moves toward the top of the room-temperature water.

• The hot water mixes with the bottom half only of the room-temperature water.

A group of students are investigating what happens when you put different temperatures of water together. In this investigation, they have set up a vial of colorless room-temperature water and are adding purple hot water at the bottom of the vial, using a pipette.

Which explanation best describes why this happens?

• Hot water is more dense than room-temperature water.

• Water immediately mixes because energy transfers between particles.

• Water expands when it is heated, so it is less dense.

• Water weighs less when it is hot, so it sinks.

The formula for calculating the density is

• $Density\ =\frac{\text{volume}}{\text{mass}}$

• $Density\ =\frac{\text{mass}}{\text{volume}}$

• $Density\ =\frac{\text{matter}}{\text{volume}}$

• $Density\ =\frac{\text{weight}}{\text{matter}}$

Look at the chart. What is the density of Solution D?

• 1.0 mL/g

• 1.325 mL/g

• 1.032 mL/g

• 1.15 mL/g

Look at the chart. What is the density of Solution A?

• 1.5 mL/g

• 1.375 mL/g

• 1.325 mL/g

• 1.15 mL/g

Look at the chart. What is the density of Solution C?

• 1.5 mL/g

• 1.375 mL/g

• 1.325 mL/g

• 1.15 mL/g