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Elements in the Universe Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

Page 1

Question 1 1. Which of the following is the correct symbol for the particle emitted in positron emission?

Question 2 2. The half life of a radioactive substance, I-123, is 13 hours. How much of a 64 mg sample of I-123 is left after 26 hours?

Question 3 3. How many protons and neutrons does an alpha particle have?

Question 4 4. What charge does a particle from a beta minus decay have?

Question 5 5. _____ usually accompanies other decays.

Page 2

Question 6 6. The electron cannot be decomposed into simpler subunits because _____.

Question 7 7. The process of atoms of an element coming together to form new, heavier elements is called _____.

Question 8 8. Which of the following is an elementary particle?

Question 9 9. The most abundant element in the universe is thought to be _____.

Question 10 10. _____ have approximately the same mass.

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Question 11 11. This is an illuminated cloudy region of gas and dust around a star:

Question 12 12. The elements that came after hydrogen and helium were formed by:

Question 13 13. Supernovae are:

Question 14 14. This is a proposed explanation of the beginning of our universe, which posits that it began in an infinitely compact form that has expanded ever since:

Question 15 15. Right after the Big Bang, the only elements present were:

Page 4

Question 16 16. Which element accounts for 15% of the Earth's mass, but isn't a significant contributor to the weight of the human body?

Question 17 17. Which of the following elements is a significant contributor (more than 1%) to the mass of the Earth and the weight of the human body?

Question 18 18. _____ is the most abundant element on Earth.

Question 19 19. Which of the following elements is found in a significant quantity in the body, but is not found in a significant quantity on Earth?

Question 20 20. Which group of elements are abundant (more than 1%) in the Earth's crust?

Page 5

Question 21 21. _____ is the most abundant element in the human body.

Question 22 22. The most abundant element on Earth in terms of quantity of atoms is _____ and in terms of mass is _____.

Question 23 23. Which statement about planets is TRUE?

Question 24 24. Of all of the elements on the periodic table, how many occur naturally in the universe?

Question 25 25. Which element is NOT in the top ten most abundant elements in the universe?

Page 6

Question 26 26. What are the two most abundant elements in the universe?

Elements in the Universe Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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