7c/d/e Retest

Students observed two containers of water that are connected by a metal bar, one with hot water and one with cold water. After a while, they created the graph above, showing the temperature change of the two containers of water. If they keep observing the temperatures of the water, what should the students expect to observe and why?

• The temperature of sample A will be cooler than the temperature of sample B because of heat transfer by convection

• 1. The temperature of sample A will become warmer than the temperature of sample B because of heat transfer by conduction

• 1. The temperatures of samples A and B will become the same as heat is transferred by convection

• 1. The temperatures of samples A and B will become the same as heat is transferred by conduction

  
  

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

During an investigation of heat transfer, students observed a metal bar being heated by a flame.  Thermometers were placed at three locations along the bar as shown in the diagram above.  What will happen to the molecules of the liquid in the thermometer on the right as the bar continues to be heated by the flame? 

• The molecules will move faster and spread out as they gain energy due to convection

• The molecules will move faster and get bigger as they gain energy due to conduction

• The molecules will move faster and spread out as they gain energy due to conduction

• The molecules will move faster and get bigger as they gain energy due to convection

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

To illustrate the concept of convection, a teacher places a separator into a tank and fills one side with hot water that has been dyed red (right side) and cold water that has been dyed blue (left side).  Which of the following is the best prediction as to what will happen to the different temperatures of water immediately after the separator is removed?

• 1. The cold water will spread along the top of both sections while the hot water will spread along the bottom of both sections.

• The hot water will spread along the top of both sections while the cold water will spread along the bottom of both sections.

• 1. The hot and the cold water will mix forming equal temperature purple water.

• 1. The cold water will stay on the left side and the hot water will stay on the right side.

Tags

NGSS.MS-PS1-4

Identify this as either conduction, convection, or radiation:

Hot coffee is stirred with a spoon; the spoon gets hot due to

• Conduction

• Convection

• Radiation

Tags

NGSS.MS-PS3-3

Identify this as either conduction, convection, or radiation:

A chair is placed several feet from a fire in a fireplace. The fireplace has a glass screen. The side of the chair facing the fireplace gets warm because of

• Conduction

• Convection

• Radiation

Identify this as either conduction, convection, or radiation:

A certain type of stainless steel cookware has a layer of copper applied to the bottom to help it heat evenly.  The copper transfers heat to the pan by

• Conduction

• Convection

• Radiation

Which substance takes the least amount of time to heat up?

• Diamond

• Aluminum

• Helium

• Water

Which substance takes the most amount of time to heat up?

• Diamond

• Aluminum

• Helium

• Water

Tags

NGSS.MS-PS1-4

What is the relationship between the specific heat value and how quickly a substance changes temperature?

• The higher the specific heat value, the faster a substance changes temperature

• The lower the specific heat value, the faster a substance changes temperature

• There is no relationship between specific heat value and a change in temperature

In which of the following state are the particles closest together?

• Fluid

• Gas

• Liquid

• Solid