Thermal Energy & Equilibrium Day1

Multiple Choice

What is the significance of understanding how distance-time graphs represent different types of motion?

• It helps us predict future positions of objects

• It allows us to calculate the mass of objects

• It is useful for understanding chemical reactions

• It helps us identify the color of objects

Open Ended

Why will both objects reach the same temperature when placed together, even if they start at different temperatures?

Open Ended

How does the amount of soup, the container it’s in, and the surface area of soup exposed to air compare to those same properties of the juice?

Open Ended

What accounts for the cold temperature of the juice?

Multiple Choice

What is the main goal of the virtual lab described in the slides?

• To test the taste of different foods

• To test thermal energy transfer and equilibrium

• To compare restaurant menus

• To design new food items

Multiple Choice

Which of the following factors would most likely help keep food within 3°C of its original temperature during delivery?

• Using insulated containers

• Packing all items together regardless of temperature

• Leaving containers open to air

• Using metal containers only

Multiple Select

In the food tray shown, which of the following arrangements would best minimize heat transfer between hot and cold items?

• Place hot and cold items next to each other

• Separate hot and cold items with warm items in between

• Mix all items randomly

• Place all cold items in one row and all hot items in another

Open Ended

A meal consists of 2 hot items, 2 warm items, and 2 cold items. The delivery container is arranged in a 3 x 2 array. What information would you need to arrange these items to keep them within 3°C of their temperature at the time they were prepared?

Open Ended

A cook has just finished making a meal. The stove has been off for five minutes, but the cast iron frying pan that was used to cook an omelet is still hot to the touch, and thermal energy is still flowing into the surrounding air. Explain why.

Fill in the Blanks

Fill in the blank: When two objects at different temperatures are placed together, heat will flow from the ___ object to the ___ object until they reach the same temperature.

Multiple Choice

Which of the following is the best example of thermal equilibrium being reached in a system?

• A chilled glass and room temperature orange juice reach the same temperature.

• A hot pan cools down but is still warmer than the air.

• An ice cube melts completely in lemonade but the lemonade stays cold.

• A warm pitcher of tea is placed in a refrigerator but remains warm.