Heat It Up!
Molecular Mayhem!
Equilibrium Experts
Ice Ice Baby!
What's The Temp?
100
What type of heat transfer occurs when you touch a hot pan?
Conduction
100
What happens to the speed of molecules when a substance is heated?
Molecules move faster.
100
!! DAILY DOUBLE !! What happens to the temperature of two objects in contact over time?
They reach the same temperature (thermal equilibrium).
100
What happens to an ice cube when you drop it into a glass of warm water?
It melts as it absorbs heat from the water.
100
What is the average kinetic energy of molecules in an object called?
Temperature
200
Which type of heat transfer causes the Sun to warm the Earth?
radiation
200
!! DAILY DOUBLE!! What happens to the average kinetic energy of molecules when the temperature of an object increases?
It increases.
200
Why does energy transfer from a hot object to a cold object?
Heat flows from areas of higher energy to areas of lower energy.
200
Mary puts a hockey puck onto ice. After a while the temperature of the hockey puck decreases.
What happens to the molecules of the hockey puck when the temperature of the puck decreases?
Molecules move slower.
200
What does it mean if two object's temperatures become equal?
They have reached equilibrium.
300
What type of heat transfer happens when warm air rises and cool air sinks?
Convection
300
Why do gases expand when heated?
The molecules move faster and spread out.
300
True or False: When two objects are at thermal equilibrium, they still exchange energy.
False
300
How does the total thermal energy of a drink change after ice is added?
It decreases as heat transfers to the ice.
300
On a hot day, why does the temperature of a sidewalk rise faster than the temperature of a nearby lake?
The sidewalk has fewer molecules than the water.
400
Why does wearing a puffy jacket help you stay warm?
It insulates or keeps heat from escaping your body.
400
Describe what happens to the motion of molecules in an ice cube as it melts.
The molecules move faster and break free.
400
A hot brick and a cold brick are placed together. Which direction does heat flow?
From the hot brick to the cold brick.
400
Two identical ice cubes are placed in two glasses of different-sized drinks. Which drink cools more?
The smaller drink cools more because it loses a greater proportion of its thermal energy.
400
What is happening to the energy of object 1 with the red graph line?
Energy is transferring away from the object.
500
When lava flows over solid ground, the solid ground beneath it increases in temperature.
What happens to the molecules in the solid ground when the temperature is increasing?
The molecules move faster.
500
How does the motion of molecules in hot water differ from the motion of molecules in cold water?
Molecules in hot water move faster and have higher kinetic energy compared to those in cold water.
500
Why does it take longer for a large pot of soup to cool to room temperature than a small bowl?
The larger pot has more thermal energy to transfer to its surroundings.
500
!! DAILY DOUBLE !! Why does an ice cube melt faster on a metal surface than on wood?
Metal conducts heat to the ice faster than wood.
500
The diagram shows pieces of plastic before they touch each other.
After they have been touching for a while, which of the two top plastic pieces will be cooler, and why?
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.