Practice Test

Question 1

Seven-eighths of a sample of hydrogen-3 will have become a stable isotope after 36 point 9 years. What is the half-life of hydrogen-3?

Revolt · Accepted Answer

12 point 3 years

Question 2

Which statement best explains who is incorrect?

Revolt · Accepted Answer

Mia is incorrect because machines and engines can never be 100 percent efficient.

Question 3

Which best describes the relationship between internal energy and thermal energy?

Revolt · Accepted Answer

Thermal energy is the portion of internal energy that can be transferred.

Question 4

According to the first law of thermodynamics, what could happen when heat is added to a system?

Revolt · Accepted Answer

The heat is turned into work done by the system.

Question 5

Substance X transfers thermal energy to substance Y through conduction. What is an accurate conclusion about the condition of both substances before conduction occurred?

Revolt · Accepted Answer

Substance X’s molecules were faster than substance Y’s.

Question 6

Which best describes Jin's error?

Revolt · Accepted Answer

For step 1, he should have subtracted 78 J from 180 J to find the change in internal energy.

Question 7

What error did Mimi make?

Revolt · Accepted Answer

The changes to the nucleus are reversed.; No change in mass number occurs in beta minus decay.

Question 8

Which labels belong in the regions marked X, Y, and Z?

Revolt · Accepted Answer

X: A larger nucleus forms Y: Large amounts of energy are released Z: Smaller nuclei form

Question 9

Which statement best explains who is incorrect?

Revolt · Accepted Answer

Mia is incorrect because machines and engines can never be 100 percent efficient.

Question 10

Another substance has less kinetic energy than substance Z but more kinetic energy than substance X. What could be the temperature of this substance in degrees Celsius?

Revolt · Accepted Answer

20

Practice Test Answers

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