Holt McDougal Modern Chemistry Chapter 3: Atoms: The Building Blocks of Matter 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. The mass number indicates:

Question 2 2. A tenth of a mole of pennies contains how many pennies?

Question 3 3. Why did Democritus disagree with Aristotle?

Question 4 4. Which element has a mass number of 12 and contains 6 neutrons?

Question 5 5. How many neutrons does the most common isotope of hydrogen have?

Page 2

Question 6 6. Which of the following was the instrument used for the discovery of the electron?

Question 7 7. What did Rutherford discover in his gold foil experiment?

Question 8 8. ALL atoms of the same element have:

Question 9 9. Who first coined the term atom, meaning indivisible?

Question 10 10.

A piece of pencil graphite (made of carbon atoms) has a mass of 0.12 grams. How many moles of carbon atoms are in the lead?

(The molecular mass of carbon is 12 g/mol.)

Page 3

Question 11 11. The average atomic mass or atomic weight found on the periodic table is _____.

Question 12 12. X and Y are elements that are isotopes to each other. Which of the following is true about X and Y?

Question 13 13. How are isotopes of the same element similar?

Question 14 14.

A piece of copper wire contains 5 moles of copper atoms. What is its mass?

(The molecular mass of copper is 63.5 g/mol.)

Question 15 15. The nucleus of an atom:

Page 4

Question 16 16. Magnesium has three common isotopes. Based on its average atomic mass, which is the most common?

Question 17 17. If Atom #1 has 19 protons and 22 neutrons, and Atom #2 has 20 protons and 22 neutrons, are these isotopes of the same element?

Question 18 18. Which scientist is credited with discovering the charge of individual electrons?

Question 19 19.

A computer chip contains 1.20 x 10^23 atoms of silicon. What is its mass?

(The molecular mass of silicon is 28 g/mol.)

Question 20 20.

A piece of aluminum foil has a mass of 27 grams. About how many atoms does this contain?

(Aluminum has a molecular mass of 27 g/mol.)

Holt McDougal Modern Chemistry Chapter 3: Atoms: The Building Blocks of Matter 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!

Holt McDougal Modern Chemistry: Online Textbook Help  /  Science Courses
Support