Unit 7 - Changes in State and Heat Transfer

Mario takes a cold can of soda out of a refrigerator. He sets the cold can on a table in the room and leaves it there for a few hours. Which of the following best describes what will occur?

• The cold from the soda can will reduce the temperature of the air in the room.

• Heat from the air will move into the soda can until both reach the same temperature.

• The soda in the can will change state and temperature as it releases cold molecules into the air.

• The soda can will absorb heat until it becomes warmer than the temperature of the air in the room.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following labels should be added to all of the solid black arrows in the above illustration?

• heat removed

• temperature decreased

• heat added

• chemical change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The table lists four objects, each at a different temperature. If two of these objects are placed together in a container so the objects are touching, which of these scenarios correctly describes how heat could flow between the objects?

• Heat will flow from Object 1 to Object 3.

• Heat will flow from Object 1 to Object 4.

• Heat will flow from Object 2 to Object 4.

• Heat will flow from Object 2 to Object 3.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

A chemist measures the temperature at which a particular liquid boils. She makes the measurement a second time. Which of these is most likely described in this scenario?

• repetition

• replication

• error analysis

• equipment check

Neil was cooking pasta for dinner and noticed that water drops were forming on the lid of the pot of boiling water. He knows that water turns to steam at 100 degrees Celsius. How is it possible that the water drops formed on the lid when the temperature of the water was so hot?

• As the water heated, some of the liquid stayed in that form and collected on the lid.

• The lid was much hotter than the boiling water, so it turned the steam back into liquid.

• The lid of the pot is cooler than the boiling water, so the steam turned back into a liquid.

• Some of the water escaped before the temperature got too hot and was caught by the lid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

During a visit to their local park, two students guessed that park visitors are more likely to throw their trash on the ground in the summer than in the fall. To test this theory, Maxey visits the park every Saturday during the months of June and October and counts the pieces of trash in front of the park’s clubhouse. Juan visits the park once in the summer and once in the fall. During each visit, Juan sits on a park bench for four hours and counts the number of times park visitors throw trash on the ground. Based on this information alone, which of the following statements is true?

• The students have different hypotheses.

• The students are testing a scientific theory.

• The students collected different types of qualitative data.

• The students used different methods to make their scientific observations.

Which statement describes what happens as the water is heated?

• The number of particles increases, the energy of the water increases, and the temperature increases.

• The number of particles stays the same, the energy of the water decreases, and the temperature increases.

• The number of particles stays the same, the energy of the water increases, and the temperature increases.

• The number of particles decreases, the energy of the water decreases, and the temperature decreases.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A Chef in a very busy restaurant is trying to cook food as quickly as possible. He decides to switch to using a pan made of copper instead of a pan made of aluminum. Given the information in the chart below, why would the Chef have made this decision?

• The copper pot would heat faster because it has a lower specific heat value.

• The copper pot would heat slower because it has a lower specific heat value.

• The copper pot would heat faster because it has a higher specific heat value.

• The copper pot would heat slower because it has a higher specific heat value.

Tags

NGSS.MS-PS3-5

Vaporization occurs when water changes state into a gas, or vapor. This process is also called boiling, or evaporation. Which of the following processes could cause water to vaporize?

• heat is added

• heat is remove

• the pressure is increased

• the volume of water is increased

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Students conducted several investigations this year. The following statements were taken from the procedures that they used. Which statement is the best example of replication?

• Investigation 1

• Investigation 2

• Investigation 3

• Investigation 4