Time and Temperature

Ashton warms a pure, solid substance. He graphs the changes in temperature as shown in the figure below. What is happening as he warms the substance?

• molecules move more slowly

• molecules move more rapidly

• speed of the molecules in not changing

• molecules speed up than slow down

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Mrs. Plata likes to collect river rocks on her daily walk. She picked up a rock and placed it in her pocket. If the rock is 10 degrees Celsius and Mrs. Plata is 31 degrees Celsius, which of the following BEST describes the transfer of energy?

• Thermal energy will flow from Mrs. Plata to the rock.

• Thermal energy will flow from the rock to Mrs. Plata.

• Thermal energy will flow from Mrs. Plata into the air.

• Thermal energy will flow into the air and to the rock.

Tags

NGSS.MS-PS3-3

When cold water is added slowly to warm water they will slowly blend over time evenly through the entire liquid. Which BEST explains the reason the heat moves throught the liquid?

• The densities of the liquids are similar.

• Cold liquids rise and hot liquids sink causing mixing.

• Molecules creates chemical bonds the help spread energy.

• Heat always moves from higer temperatures to lower temperatures.

Tags

NGSS.MS-PS3-5

At room temperature water is a liquid. How could the water be changed to a solid?

• add heat

• remove heat

• decrease density

• increase density

Tags

NGSS.MS-PS1-4

Using the picture. What was the change in the system?

• air was added to the system

• heat was added to the system

• water was added to the system

• particles were added to the system

Tags

NGSS.MS-PS1-4

David is warming chocolate on the stove. How is the motion of the particles different after the temperature is increased?

• they move faster

• they move slower

• the move less freely

• they vibrate close together

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How does heat affect the thermal energy of an object that is colder than the air that surrounds it?

• Heat decreases the thermal energy of an object as energy moves to the air.

• Heat causes the thermal energy of the object to increase as energy moves from the warmer air to the colder object.

• Heat has no effect on thermal energy, but it increases the potential energy of an object.

• Heat is not related to thermal energy, so it cannot affect the thermal energy of an object.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

How does removing heat change the particles in a closed system?

• Particles move apart

• Particles slow down and break apart

• Particles move faster and potentially change phases

• Particles move slower and potentially change phases

Tags

NGSS.MS-PS1-4

On a hot day the lake water warms and the temperature increases. How does the movement of the particles change?

• move slower and farther apart

• move slower and closer together

• move faster and farther apart

• move faster and closer together

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Kim is making iced tea. She brings a pitcher of water to a boil, adds a bag of tea leaves, and sets the pitcher aside for 5 minutes. After the time has passed, Kim removes the bag of tea leaves and adds ice to cool the liquid tea. Which of the following best describes the direction of heat flow of heat while the tea is cooling? 

• Heat flows between the ice and tea equally

• Heat flows between the ice and the tea. 

• Heat flows from the tea to the ice. 

• Heat flows from the ice to the tea. 

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4