OSE 6.2 End of Unit Assessment W (copy)

The teacher asks students to touch their plastic table and then touch the metal chair leg. The students say, “The chair leg feels colder.”

The teacher uses a thermometer. The thermometer shows that the metal leg and the plastic table are the same temperature.

The teacher asks: “Why does metal usually feel cold, but plastic feels warm, when they are the same temperature?”

The class decides to do an investigation to find out.

The students tested how objects change temperature. Which two (2) things can they study with this experiment?

Which one of the following claims is best supported by the data for Substances 1, 2, and 3?

Claim: When particles move faster (kinetic energy increases), energy must move into those particles.

Question: Which data best shows this? Select one.

Suzanne made a claim that much less energy was transferred during the cooled metal block investigation than when the block was heated.

The teacher asked Suzanne what evidence caused her to make this claim.

Which one statement is best supported by this data?

Some students were still not sure why the table and chair felt different.

The teacher asked, “How can you test this with the same materials?”

The students put a metal sample and a plastic sample under a heat lamp to see which one absorbs more energy.

Question: Which things must stay the same (controlled) to get the best results?

The teacher told the students:

• If energy leaves your hand, your hand feels cold.
• If energy moves into your hand, your hand feels warm.

This helped students explain why the chair leg felt cold and the table felt warm, even though both were the same temperature.

Question: Which answer best explains this?

In which one part of the model does chemical change most likely occur?

How do the substances at Area B and Area F of the model compare?

What one way do the particles in Area A of the model most likely compare to those in Area B?

Why does the candle wax solidify (become a solid) in Area D?

Sofia wants to make a model to show the difference between wax molecules when wax is a liquid and when wax is a solid.

Question: What difference should her model show?

Sometimes people must sleep outside on the ground. The government wants a blanket that will keep people warm for 6 hours and still be light and cheap. They are testing three blankets to pick the best one.

Criteria (What the blanket must do) — circle the important ones

• Keep a person warm inside the blanket for 6 hours.
• Inside the blanket the air must change no more than 10 °F (5.5 °C).
• Be lightweight so it is easy to carry.
• Can be used during the day too.

Constraints (Things we must also follow) — circle the important ones

• Keep costs low (be cheap).
• Be environmentally friendly and reusable.

Why is the government so concerned about people getting too cold if they sleep directly on the ground?

The government is concerned about people getting too cold if they sleep directly on the ground because:

a. people have a higher body temperature than the ground.

b. energy transfers from the person to the ground.

c. energy transfers from the ground to the person.

d. the person is small compared to the Earth.

Use the information and data from the tests to make a recommendation for which blanket the government should choose.

Reasoning: Explain using scientific principles and connect the test results to the criteria and constraints.

Use these sentence starters to help you answer the question.

The __________ blanket will speed up / slow down energy transfer from the person / Earth to the person / Earth.

The thickness of the blanket will speed up / slow down the energy transfer because there is more / less material between the person and the Earth.

The light will absorb / reflect off the blanket.

This will help keep the person warm because ______ .

WRITE A CER TO ANSWER THIS QUESTION:

At night, the ground and the air just above the ground are usually about the same temperature. Engineers want to make a pop-up hammock for emergencies. This hammock would let people sleep in the air above the ground.

Making this hammock will take time and money. Before spending resources, we need to ask:

• Based on what you know about energy transfer, is this a good idea?
• Would sleeping in a hammock, with a blanket, keep a person’s temperature more stable than sleeping on the ground with a blanket?

Sentence Starter:

• I think sleeping in a hammock (would / would not) help because ___.
• Energy moves from ___ to ___, so the hammock ___ .

Claim:

Suspending a person in a hammock while wrapped in a blanket would / would not decrease the amount of temperature change compared to sleeping on the ground.

Evidence:

Pick 2 pieces of evidence from your notebook to show how touching the Earth or being surrounded by air will change the amount of energy transferred.

Reasoning:

The person being in the hammock will / will not change the rate of the energy transfer.

A solid / gas has more / less collisions and transfers energy faster.

Less / More particle collisions will slow energy transfer.