Question 1

Which type of system is represented by the first image (a pot boiling without a lid)?

Accepted Answer

An open system, because it exchanges both energy and matter with its surroundings.

Question 2

Which type of system is represented by the second image (a pressure cooker/Instant Pot)?

Accepted Answer

A closed system, because it exchanges energy but not matter with its surroundings.

Question 3

If the boiling pot in the first image is left uncovered, what happens to the mass of water inside over time?

Accepted Answer

The mass decreases because water vapor escapes into the surroundings.

Question 4

Which of the following best describes the energy transfer in a closed system like the pressure cooker in the second image?

Accepted Answer

Only energy is exchanged with the surroundings.

Question 5

A pot of water is boiling on a stove without a lid. Which of the following statements is true about the energy and matter exchange?

Accepted Answer

Energy is transferred to the pot, and water vapor (matter) escapes into the air.

Question 6

If you place the boiling pot inside a perfectly insulated box, what type of system does it become?

Accepted Answer

An isolated system

Question 7

Which equation would you use to calculate the kinetic energy of steam molecules escaping from the boiling pot?

Accepted Answer

$$Ek = \frac{1}{2}mv^2$

Question 8

A pressure cooker (closed system) is heated on a stove. What happens to the pressure inside as energy is added?

Accepted Answer

The pressure increases because energy is added but matter cannot escape.

Question 9

Which of the following is NOT a characteristic of an isolated system?

Accepted Answer

It exchanges both energy and matter with its surroundings.

Question 10

If a pot of water is boiling and steam is escaping, which statement best describes the system?

Accepted Answer

It is an open system because both energy and matter are exchanged.

Les propriétés de l'énergie et les systèmes physiques

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