How are temperature and molecular motion related? *

• When temperature goes up, so does molecular motion.

• When temperature goes up, molecular motion goes down.

Tags

NGSS.MS-PS1-4

What is Kinetic Energy (KE)? *

• Energy that a thermometer has because it shows temperature.

• Energy that is made by heat particles.

• Energy an object has because of its motion.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

How does the temperature of an object change?

• The particles of the object with less heat take heat energy away from the particles of the object that have more heat.

• The particles of both objects mix together and make the temperatures the same for both objects.

Tags

NGSS.MS-PS3-4

Thermal energy can only transfer when...

• Particles are moving fast.

• Equilibrium has occurred.

• Particles are moving very slowly.

• Particles collide with one another.

How do molecular collisions affect the thermal energy of an object over time?

• The hot particles of one object takes all of the cold particles from the cold object.

• The particles keep colliding from both objects and exchanging thermal energy until both objects reach equilibrium.

• The particles keep colliding from both objects and exchanging thermal energy until both objects reach kinetic energy.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Let's say you are investigating how adding different masses of metal blocks to a bucket of water affect the temperature of that water. Buckets A and B each contain the same amount of room temperature water at 20° C, with plenty of space to add more material. You lower a different mass of metal blocks into each bucket. All blocks are made of the same material and are at the same temperature, as shown. Each block weighs 3 kg. To Bucket A, you add three cold blocks (9 kg) at 5° C. To Bucket B, you add one cold block (3 kg) at 5° C. You then measure the temperature of the water in each bucket. Which bucket of water will have the greatest change in temperature?

• Bucket A

• Bucket B

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The total amount of thermal energy of a system DOES NOT depend on which of the following?

• The amount of matter in the system.

• The types of matter in the system.

• The transfer of thermal energy between objects in the system.

Tags

NGSS.MS-PS3-4

Recall our dog crate and pop can cooling investigations. What is the following sentences describing?: The water on the crate/can was colder than the air. Heat from the air particles transferred to the water on the crate/can. When the water was warm enough, it turns into a gas and takes the thermal energy with it. That is what cooled the crate/ can.

• Kinetic Energy

• Thermal Energy

• Equilibrium

• Evaporation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is an independent variable in a fair investigation?

• A variable that is kept the same on purpose during the whole investigation.

• A variable that is changed on purpose to see if it changes your outcomes.

• A variable that is measured to see if it changed when the investigation was conducted.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

What is a dependent variable in a fair investigation?

• A variable that is kept the same on purpose during the whole investigation.

• A variable that is changed on purpose to see if it changes your outcomes.

• A variable that is measured to see if it changed when the investigation was conducted.

Tags

NGSS.MS-PS2-2