8th Science Unit 4: Thermal Energy Critical Juncture Assessment

Front

What happens to the molecules in the solid ground when the temperature is increasing?

Back

The energy of the molecules in the ground increases.

Front

After they have been touching for a while, which of the two top plastic pieces will be cooler, and why? (a) The larger top plastic piece will be cooler than the smaller top plastic piece. It started with more total energy, so less energy had to transfer for both pieces in the stack to reach the same total energy. (b) The larger top plastic piece will be cooler than the smaller top plastic piece, because the energy that transferred to it was spread out over more molecules. (c) Both pieces will be the same temperature, because both of the bottom pieces had the same amount of energy to transfer and the molecules in the top plastic start with the same energy. (d) The smaller top plastic piece will be cooler than the larger top plastic piece, because less energy has to transfer for the molecules to reach the same temperature as the molecules of the bottom plastic.

Back

The larger top plastic piece will be cooler than the smaller top plastic piece, because the energy that transferred to it was spread out over more molecules.

Front

What happened to the molecules in the apple when the temperature of the apple decreased?

Back

The energy of the molecules in the apple decreased.

Front

After a while, which of the two top containers will be cooler, and why?

Back

The larger top container will be cooler than the smaller top container, because the energy that transferred to it is spread out over more molecules.

Front

What happens to the molecules of the water when the temperature of the water increases?

Back

The energy of the water molecules increases.

Front

What happens to the molecules of the hockey puck when the temperature of the puck decreases?

Back

The energy of the molecules in the hockey puck decreases.

Front

How does the temperature of the top chocolate bar compare with the temperature of the bottom chocolate bar now, and what will happen after the bars have been touching for a while?

Back

Before the bars touch, the top bar is hotter than the bottom bar. Once the bars are touching, the top bar will transfer kinetic energy to the molecules in the cooler bottom bar until both bars reach the same temperature, which will be in between their starting temperatures.

Front

Rowan is at an all-you-can-eat breakfast. He has a pancake on his plate and is going to put another pancake on top of it. Which one of these other pancakes would make the bottom pancake the warmest? A freshly cooked hot pancake, A pancake at room temperature, A cold pancake from the fridge, A pancake with syrup

Back

A freshly cooked hot pancake

Front

If the temperature of a substance is hot, what are the molecules doing?

Back

they are moving very fast

Front

What is thermal energy transfer in cooking?

Back

The movement of heat from a warmer object to a cooler one.