EP 4 Sample Exam Questions Midterm 1

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

____ 1. Who was the man who lived from 460B.C.–370B.C. and was among the first to suggest the idea of atoms?
a. Atomos c. Democritus
b. Dalton d. Thomson


____ 2. Which of the following was NOT among Democritus’s ideas?
a. Matter consists of tiny particles called atoms.
b. Atoms are indivisible.
c. Atoms retain their identity in a chemical reaction.
d. Atoms are indestructible.


____ 3. The smallest particle of an element that retains the properties of that element is a(n) ____.
a. atom c. proton
b. electron d. neutron


____ 4. Dalton's atomic theory included which idea?
a. All atoms of all elements are the same size.
b. Atoms of different elements always combine in one-to-one ratios.
c. Atoms of the same element are always identical.
d. Individual atoms can be seen with a microscope.


____ 5. Which of the following is NOT a part of Dalton's atomic theory?
a. All elements are composed of atoms.
b. Atoms are always in motion.
c. Atoms of the same element are identical.
d. Atoms that combine do so in simple whole-number ratios.


____ 6. Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised about a century ago?
a. Atoms are tiny indivisible particles.
b. Atoms of the same element are identical.
c. Compounds are made by combining atoms.
d. Atoms of different elements can combine with one another in simple whole number ratios.


____ 7. The comparison of the number of atoms in a copper coin the size of a penny with the number of people on Earth is made to illustrate which of the following?
a. that atoms are indivisible
b. that atoms are very small
c. that atoms are very large
d. that in a copper penny, there is one atom for every person on Earth


____ 8. The range in size of most atomic radii is approximately ____.
a. 2 to 5 cm c. 5 10 m to 2 10 m
b. 2 to 5 nm d. 5 10 m to 2 10 m


____ 9. Dalton hypothesized that atoms are indivisible and that all atoms of an element are identical. It is now known that ____.
a. all of Dalton's hypotheses are correct
b. atoms of an element can have different numbers of protons
c. atoms are divisible
d. all atoms of an element are not identical but they must all have the same mass


____ 10. Why did J. J. Thomson reason that electrons must be a part of the atoms of all elements?
a. Cathode rays are negatively-charged particles.
b. Cathode rays can be deflected by magnets.
c. An electron is 2000 times lighter than a hydrogen atom.
d. Charge-to-mass ratio of electrons was the same, regardless of the gas used.


____ 11. Which of the following is true about subatomic particles?
a. Electrons are negatively charged and are the heaviest subatomic particle.
b. Protons are positively charged and the lightest subatomic particle.
c. Neutrons have no charge and are the lightest subatomic particle.
d. The mass of a neutron nearly equals the mass of a proton.


____ 12. Who conducted experiments to determine the quantity of charge carried by an electron?
a. Rutherford c. Dalton
b. Millikan d. Thomson


____ 13. What is the relative mass of an electron?
a. 1/1840 the mass of a hydrogen atom c. 1/1840 the mass of a C-12 atom
b. 1/1840 the mass of a neutron + proton d. 1/1840 the mass of an alpha particle


____ 14. Which hypothesis led to the discovery of the proton?
a. When a neutral hydrogen atom loses an electron, a positively-charged particle should remain.
b. A proton should be 1840 times heavier than an electron.
c. Cathode rays should be attracted to a positively-charged plate.
d. The nucleus of an atom should contain neutrons.


____ 15. Which of the following is correct concerning subatomic particles?
a. The electron was discovered by Goldstein in 1886.
b. The neutron was discovered by Chadwick in 1932.
c. The proton was discovered by Thomson in 1880.
d. Cathode rays were found to be made of protons.


____ 16. All atoms are ____.
a. positively charged, with the number of protons exceeding the number of electrons
b. negatively charged, with the number of electrons exceeding the number of protons
c. neutral, with the number of protons equaling the number of electrons
d. neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons


____ 17. The particles that are found in the nucleus of an atom are ____.
a. neutrons and electrons c. protons and neutrons
b. electrons only d. protons and electrons


____ 18. As a consequence of the discovery of the nucleus by Rutherford, which model of the atom is thought to be true?
a. Protons, electrons, and neutrons are evenly distributed throughout the volume of the atom.
b. The nucleus is made of protons, electrons, and neutrons.
c. Electrons are distributed around the nucleus and occupy almost all the volume of the atom.
d. The nucleus is made of electrons and protons.


____ 19. The nucleus of an atom is ____.
a. the central core and is composed of protons and neutrons
b. positively charged and has more protons than neutrons
c. negatively charged and has a high density
d. negatively charged and has a low density


____ 20. The atomic number of an element is the total number of which particles in the nucleus?
a. neutrons c. electrons
b. protons d. protons and electrons


____ 21. An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are ____.
a. 152 protons and 76 electrons c. 38 protons and 38 electrons
b. 76 protons and 0 electrons d. 76 protons and 76 electrons


____ 22. The sum of the protons and neutrons in an atom equals the ____.
a. atomic number c. atomic mass
b. nucleus number d. mass number


____ 23. What does the number 84 in the name krypton-84 represent?
a. the atomic number c. the sum of the protons and electrons
b. the mass number d. twice the number of protons


____ 24. All atoms of the same element have the same ____.
a. number of neutrons c. mass numbers
b. number of protons d. mass


____ 25. Isotopes of the same element have different ____.
a. numbers of neutrons c. numbers of electrons
b. numbers of protons d. atomic numbers


____ 26. Isotopes of the same element have different ____.
a. positions on the periodic table c. atomic numbers
b. chemical behavior d. mass numbers


____ 27. In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly?
a. In, 49 protons, 49 electrons c. Cs, 55 protons, 132.9 electrons
b. Zn, 30 protons, 60 electrons d. F, 19 protons, 19 electrons


____ 28. The mass number of an element is equal to ____.
a. the total number of electrons in the nucleus
b. the total number of protons and neutrons in the nucleus
c. less than twice the atomic number
d. a constant number for the lighter elements


____ 29. Using the periodic table, determine the number of neutrons in O.
a. 4 c. 16
b. 8 d. 24


____ 30. How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?
a. 50 protons, 50 electrons, 75 neutrons c. 120 neutrons, 50 protons, 75 electrons
b. 75 electrons, 50 protons, 50 neutrons d. 70 neutrons, 75 protons, 50 electrons

Answer Section

MULTIPLE CHOICE

1. ANS: C DIF: L2 REF: p. 101 OBJ: 4.1.1

2. ANS: C DIF: L2 REF: p. 101 OBJ: 4.1.1

3. ANS: A DIF: L1 REF: p. 101, p. 102
OBJ: 4.1.1, 4.1.2

4. ANS: C DIF: L2 REF: p. 102 OBJ: 4.1.2

5. ANS: B DIF: L2 REF: p. 102 OBJ: 4.1.2

6. ANS: A DIF: L2 REF: p. 104 OBJ: 4.1.2

7. ANS: B DIF: L2 REF: p. 103 OBJ: 4.1.3

8. ANS: C DIF: L2 REF: p. 103 OBJ: 4.1.3

9. ANS: C DIF: L1 REF: p. 104 OBJ: 4.2.1

10. ANS: D DIF: L2 REF: p. 105 OBJ: 4.2.1

11. ANS: D DIF: L2 REF: p. 104, p. 105, p. 106
OBJ: 4.2.1

12. ANS: B DIF: L2 REF: p. 105 OBJ: 4.2.1

13. ANS: A DIF: L2 REF: p. 105 OBJ: 4.2.1

14. ANS: A DIF: L3 REF: p. 106 OBJ: 4.2.1

15. ANS: B DIF: L3 REF: p. 105, p. 106
OBJ: 4.2.1

16. ANS: C DIF: L3 REF: p. 106 OBJ: 4.2.1

17. ANS: C DIF: L2 REF: p. 106, p. 107
OBJ: 4.2.1, 4.2.2

18. ANS: C DIF: L2 REF: p. 108 OBJ: 4.2.2

19. ANS: A DIF: L2 REF: p. 107, p. 108
OBJ: 4.2.2

20. ANS: B DIF: L1 REF: p. 110 OBJ: 4.3.1

21. ANS: D DIF: L1 REF: p. 110 OBJ: 4.3.1

22. ANS: D DIF: L1 REF: p. 111 OBJ: 4.3.1

23. ANS: B DIF: L1 REF: p. 111 OBJ: 4.3.1

24. ANS: B DIF: L1 REF: p. 110 OBJ: 4.3.1

25. ANS: A DIF: L1 REF: p. 112, p. 113
OBJ: 4.3.1

26. ANS: D DIF: L1 REF: p. 112, p. 113
OBJ: 4.3.1

27. ANS: A DIF: L2 REF: p. 110 OBJ: 4.2.1, 4.3.1

28. ANS: B DIF: L2 REF: p. 111 OBJ: 4.3.1

29. ANS: B DIF: L2 REF: p. 111 OBJ: 4.3.1

30. ANS: A DIF: L2 REF: p. 111 OBJ: 4.3.1