Heated gases will rise to the top of its container. Why does this occur?(1 point)
Responses
Heated gases will decrease in kinetic energy and increase in density.
Heated gases will decrease in kinetic energy and increase in density.
Heated gases will decrease in kinetic energy and decrease in density.
Heated gases will decrease in kinetic energy and decrease in density.
Heated gases will increase in kinetic energy and decrease in density.
Heated gases will increase in kinetic energy and decrease in density.
Heated gases will increase in kinetic energy and increase in density.
Heated gases will increase in kinetic energy and increase in density.
Heated gases will increase in kinetic energy and decrease in density.
An ice cube is placed on a metal block that is at a room temperature of 30oC. Which statement describes the transfer of heat between the ice cube and metal block?(1 point)
Responses
Heat is transferred from the ice cube to the metal block, and the ice melts.
Heat is transferred from the ice cube to the metal block, and the ice melts.
Heat is transferred from the ice cube to the air, and the ice melts.
Heat is transferred from the ice cube to the air, and the ice melts.
Heat is transferred from the air and metal to the ice cube, and the ice melts.
Heat is transferred from the air and metal to the ice cube, and the ice melts.
Heat is transferred from the air to the ice cube, and the ice melts.
Heat is transferred from the metal block to the ice cube, and the ice melts.
The picture below shows two rooms at different temperatures.
Which statement describes what will happen as the door opens between the two rooms?
(1 point)
Responses
The warmer room will cool down to 50°F.
The warmer room will cool down to 50°F.
The colder room will warm up to 80°F.
The colder room will warm up to 80°F.
The temperature in each room will remain unchanged.
The temperature in each room will remain unchanged.
The temperature in both rooms will become equal over time.
The temperature in both rooms will become equal over time.
The temperature in both rooms will become equal over time.
Lucy is making a cup of hot chocolate. She puts the chocolate and hot water into a cup, and stirs the mixture.
A few minutes later, she notices the cup and the spoon have gotten hot. What made Lucy’s cup and spoon get hot?
(1 point)
Responses
Heat was transferred through conduction to the cup and spoon when the hot water molecules collided frequently with the cooler molecules in the cup and spoon and transferred heat.
Heat was transferred through conduction to the cup and spoon when the hot water molecules collided frequently with the cooler molecules in the cup and spoon and transferred heat.
Heat was transferred through convection to the cup and spoon when the hot water molecules radiated into the cooler molecules of the hot chocolate mix and transferred heat.
Heat was transferred through convection to the cup and spoon when the hot water molecules radiated into the cooler molecules of the hot chocolate mix and transferred heat.
Heat was transferred through conduction to the cup and spoon when the hot water molecules flowed in currents through the cooler molecules of the hot chocolate mix and transferred heat.
Heat was transferred through conduction to the cup and spoon when the hot water molecules flowed in currents through the cooler molecules of the hot chocolate mix and transferred heat.
Heat was transferred through convection to the cup and spoon when the hot water molecules moved through the cooler molecules in the surrounding air and transferred heat.
Heat was transferred through conduction to the cup and spoon when the hot water molecules collided frequently with the cooler molecules in the cup and spoon and transferred heat.
Question
The picture below shows two flasks, one with hot water and one with room temperature water, which are connected by a conductive metal bar.
In which direction does the thermal energy between the flasks flow?
(1 point)
Responses
Thermal energy flows equally between the two flasks.
Thermal energy flows equally between the two flasks.
Thermal energy does not flow between the two flasks.
Thermal energy does not flow between the two flasks.
Thermal energy flows from the flask with hot water to the flask with room temperature water.
Thermal energy flows from the flask with hot water to the flask with room temperature water.
Thermal energy flows from the flask with room temperature water to the flask with hot water.
Thermal energy flows from the flask with hot water to the flask with room temperature water.
Which type of energy transfer can take place without matter present?(1 point)
Responses
Conduction
Conduction
Convection
Convection
Radiation
Radiation
Insulation